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Daylight, Sunlight and Overshadowing
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Ballymore Properties Group and Network Rail Contents
November 2011 gva.co.uk 2
CONTENTS
1. Introduction....................................................................................................................... 3
2. Executive Summary ......................................................................................................... 4
3. Daylight/Sunlight Planning Principles............................................................................. 5
4. Assessment Results ........................................................................................................... 9
5. Summary.......................................................................................................................... 21
Appendices
Appendix I Site Location Plan, Tabled Results and Contour Drawing
Appendix ii Overshadowing Assessment
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Ballymore Properties Group and Network Rail Introduction
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1. Introduction1.1 GVA Schatunowski Brooks have been instructed by Network Rail Infrastructure Limited
and Domain Developments Limited to provide daylight, sunlight and overshadowing
advice for the redevelopment at West End Lane.
1.2 We have been provided with a 3D Z map model which shows the bulk/massing of theadjacent properties. We have also been provided with the proposed drawings from
John Thompson and Partners, drawing reference 00437.
1.3 We have attended site and reviewed the adjacent properties, counting brick coursesin order to locate the height and locations of the adjacent windows to the
neighbouring residential properties. We have also sought to obtain layout information
and elevations for the adjacent properties in order to provide a greater accuracy.
1.4 For the residential properties to Sherriff Road we have had to make estimates on thelocation of the windows as access to the rear of these properties is restricted and the
foliage from the trees limits the ability to see all the windows to the rear of these
properties.
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Ballymore Properties Group and Network Rail Executive Summary
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2. Executive Summary2.1 The daylight and sunlight assessments to the neighbouring residential properties have
demonstrated that there will be a good level of daylight and sunlight retained in the
proposed condition. The development site currently has low level small buildings and
therefore a comprehensive redevelopment of this site will reduce daylight and sunlight
levels when comparing the existing and proposed conditions. However, the daylight
and sunlight levels in the proposed condition are good levels of light.
2.2 The overshadowing assessment has demonstrated that all but one of the neighbouringgardens and all the proposed amenity areas pass or exceed the BRE Guidelines,
ensuring good levels of sunlight will be retained with the proposed development in
place. The one rear garden that falls below the BRE guideline is mostly overshadowed
by the assumed 1.8m high solid fence. If the fence were not 1.8m high and of solid
construction then the garden would pass the BRE guidelines.
2.3 The internal daylight assessments to the proposed habitable rooms have demonstratedthat a good level of compliance will be achieved with the proposed development
being in place. In the context of the 435 habitable rooms being provided in thisdevelopment only 0.46% fall below the recommended ADF for their use. We consider
this is a small proportion in the context of what is being provided and it is not
uncommon to have some rooms below the BRE Guideline recommendations for high
density developments.
2.4 The design of the proposed buildings have allowed light to permeate through so as tolimit the effects of daylight and sunlight on the neighbouring properties, whilst ensuring
that future occupants within the development obtain good daylight and sunlight.
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Ballymore Properties Group and Network Rail Daylight/Sunlight Planning Principles
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3. Daylight/Sunlight Planning Principles3.1 The Building Research Establishment (BRE) guidelines Site Layout Planning for Daylight
and Sunlight: a guide to good practice is the document referred to by most local
authorities and the second edition has been produced dated 2011. The BRE Guide
covers amenity requirements for sunlight and daylight to buildings around any
development site.
3.2 The introduction to the guidelines state: -
"The guide is intended for building designers and their clients, consultants and planningofficials. The advice given here is not mandatory and this document should not be seen
as an instrument of planning policy; Its aim is to help rather than constrain the
developer. Although it gives numerical guidelines, these should be interpreted flexibly
because natural lighting is only one of the many factors in site layout design."
Daylighting
3.3 The requirements governing daylighting to existing residential buildings around adevelopment site are set out in Part 2.2 of the guidelines. The amount of light available
to any window depends upon the amount of unobstructed sky that can be seen from
the centre of the window under consideration. The amount of visible sky and
consequently the amount of available skylight is assessed by calculating the vertical
sky component at the centre of the window. The guidelines advise that bathrooms,
toilets, storerooms, circulation areas and garages need not be analysed. The guidelines
also suggest that distribution of daylight within rooms is reviewed although bedrooms
are considered to be less important.
3.4 The vertical sky component can be calculated by using the skylight indicator providedas part of the guidelines, by mathematical methods using what is known as a waldram
diagram or by 3D CAD modelling.
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3.5 The guidelines states the following:-"If this vertical sky component is greater than 27% then enough skylight should still be
reaching the window of the existing building. Any reduction below this level should bekept to a minimum. If the vertical sky component with the new development in place, is
both less than 27% and less than 0.8 times its former value, then occupants of the
existing building will notice the reduction in the amount of skylight."
3.6 It must be interpreted from this criterion that a 27% vertical sky component (VSC)constitutes adequacy, but where this value cannot be achieved a reduction of up to
0.8 times its the former value (this is the same as saying a 20% reduction when
compared against the existing condition) would not be noticeable and would not
therefore be considered material.
3.7 The VSC calculation only measures light reaching the outside plane of the windowunder consideration, so this is potential light rather than actual. Depending upon the
room and window size, the room may still be adequately lit with a lesser VSC value than
the target values referred to above.
3.8 Appendix C of the BRE guidelines sets out various more detailed tests that assess theinterior daylight conditions of rooms. These include the calculation of the average
daylight factors (ADF) and no sky-lines. The ADF value determines the level of interior
illumination that can be compared with the British Standard, BS 8206: Part 2. This
recommends a minimum of 2% for kitchens, 1.5% for living rooms and 1% for bedrooms.
3.9 The no sky-line, or daylight distribution contour shows the extent of light penetration intothe room at working plane level, 850mm above floor level. If a substantial part of the
room falls behind the no sky-line contour, the distribution of light within the room may
look poor.
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Sunlighting
3.10 Requirements for protection of sunlighting to existing residential buildings around adevelopment site are set out in Part 3.2 of the BRE guidelines. There is a requirement to
assess windows of surrounding properties where the main windows face within 90
degrees of due south. The calculations are taken at the window reference point at the
centre of each window on the plane of the inside surface of the wall. The guidelines
further state that kitchens and bedrooms are less important in the context of
considering sunlight, although care should be taken not to block too much sun. The
guidelines sets the following standard:-
"If this window reference point can receive more than one quarter of APSH (annualprobable sunlight hours), including at least 5% of APSH in the winter months of 21
September and 21 March, then the room should still receive enough sunlight. The
sunlight availability indicator in Appendix A can be used to check this.
Any reduction in sunlight access below this level should be kept to a minimum. If the
available sunlight hours are both less than the amount given and less than 0.8 times
their former value, either over the whole year or just during the winter months then the
occupants of the existing building will notice the loss of sunlight."
3.11 To summarize the above, a good level of sunlight to a window is 25% annual probablesunlight hours, of which 5% should be in winter months. Where sunlight levels fall below
the suggested level, a comparison with the existing condition is reviewed and if the
ratio reduction is within 0.8 (the same as saying a 20% reduction) its former value then
the sunlight loss will not be noticeable. Sunlight reduction that fall below 0.8, i.e. 0.7
(greater than 20%) then the sunlight losses will be noticed by the occupants.
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Overshadowing
3.12 The BRE guideline provides recommendations for overshadowing to gardens and openspaces in Part 3.3 of the guidelines.
3.13 The guidelines recommend:-It is recommended that for it to appear adequately sunlit throughout the year, at least
half of a garden or amenity area should receive at least two hours of sunlight on 21
March. If as a result of new development an existing garden or amenity area does not
meet the above, and the area which can receive two hours of sun on 21 March is less
than 0.8 times its former value, then the loss of sunlight is likely to be noticeable.
3.14 Sunlight at an altitude of 10 or less does not count, because it is likely to be blockedby low level planting anyway. In working out the total area to be considered,
driveways and hard standing for cars should be left out. Around housing, front gardens
which are relatively small and visible from public footpaths should be omitted; only the
main back garden should be analysed. Each individual garden for each dwelling in a
block should be considered separatelyNormally, trees and shrubs need not be
included, partly because their shapes are almost impossible to predict, and partly
because the dappled shade of a tree is more pleasant than the deep shadow of a
building (this applies especially to deciduous trees). .
3.15 To summarise, a garden or amenity space should receive at least 50% sunlight for atleast two hours of the day during 21 March. Where this is not achieved in the existing
condition, a ratio reduction review can be undertaken and if the ratio reduction is 0.8
or higher (this can also be expressed as 20% or less) then the occupants will not notice
the sunlight reduction.
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4. Assessment Results4.1 We set out below the assessments of the neighbouring residential properties, the
overshadowing effects and the internal daylight/sunlight assessments for the proposed
habitable rooms.
4.2 At Appendix I of this report we have appended the tabled results, the no-skylinecontour drawings and 3D views of the development site. At Appendix II we have
appended the overshadowing analysis. Below is a summary of these results:
11-77 Sherriff Road (Odd)
4.3 These properties are located to the south of the development site and we have had torely on the 3D Z map model in order to model the adjacent properties. We have had
to make assumptions on the location, height and room sizes of these properties as
access to the rear is restricted. Also due to the distance across the railway line a visual
inspection of the windows was inconclusive due to the trees and shrubs to the rear of
each of the gardens.
4.4 Whilst inspecting the site we noted that the number of storeys for each collection ofproperties and attempted to emulate the number of storeys whilst adopting a rational
window size and room size in order to give a fair and reasonable indication of the likely
impact on these properties. We have used the eaves height of the Z map model as
the control point, taking each storey from the eaves height at 2.8 metres with a window
of 1.2m high and 1.0m wide.
4.5 For the purposes of the assessments we have ignored the trees which appear to bepredominantly deciduous. We also note that for 33-77 Sherriff Road that the rear
extensions to these properties are most likely to be bathrooms or small kitchens. The
Guidelines state bathrooms need not be analysed as they are not habitable rooms.
However, for the purposes of this assessment we have assumed that there are
habitable rooms facing towards the development site to the rear of all these
properties, which should represent the worst case condition.
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4.6 We have assessed a selection of properties on Sherriff Street, these being 15a, 19, 27, 37and 47 Sherriff Road. The contour results and location plan can be found on drawings
BRE/14 and BRE/15 within Appendix 1.
4.7 The assessment results show that high levels of daylight will be retained in the proposedcondition, in excess of the BRE Guidelines. The design of the proposed buildings have
allowed light to permeate through so that a good daylight distribution into each of the
rooms is retained.
4.8 Sunlight need not be assessed to these properties as the windows are facing north.
1-12 Aerynn House (Referenced 8a Medley Road)
4.9 This is a relatively newly built property and we were not able to obtain access into theinner courtyard as the gates onto Medley Road were locked. We were however able
to obtain access to drawings from the planning portal, drawing reference 10003-P07-13
from Libero Architects. We have used this information to model the south facing
windows of this property in order to assess the effects from the proposed development.
4.10 The first floor level contains the first full habitable floor and therefore this floor level wasused to assess the worse case condition. Drawing BRE/21 shows the contour results and
location plan at Appendix 1.
4.11 The VSC assessment results show two windows out of eights, these being windowsW1/380 and W2/380 experience a noticeable reduction in daylight when compared
against the existing condition. The other six windows exceed the suggested 27% VSC or
have a reduction in daylight below the suggested 20%.
4.12 The ADF assessment shows all the rooms will greatly exceed the suggested BREguidelines (bedrooms 1%, living rooms 1.5% and kitchens 2.0%) with ADF values ranging
between 4.66% and 7.03%, which includes the rooms served by windows W1/380 and
W2/380.
4.13 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
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4.14 The sunlight assessments demonstrate that all the windows will either meet or exceedthe BRE Guidelines in the proposed condition.
4.15 In summary the occupants of 1-12 Aerynn House will retain a high level of daylight andsunlight, in excess of the BRE Guidelines. The occupants will not experience a
noticeable reduction in daylight or sunlight with the proposed development in place.
8-12 Medley Road
4.16 These properties have an oblique view of the development site and we have modelledand calculated 8 and 9 Medley Road as these are the closest properties to the
development site. Drawing BRE/20 shows the contour results and location plan at
Appendix 1. The window sizes and locations to the rear of these properties have been
estimated as access was restricted but we have sought to represent the worst case
conditions, assuming habitable rooms at all floor levels.
4.17 The south facing elevation of 8 Medley Road does not appear to contain anyhabitable rooms, although there are rear extensions set back from the site boundary
that appear to have windows facing the development site.
4.18 The VSC assessment results show 8 Medley Road will fully pass, obtaining VSC levels inexcess of 27% or reduction less than 20%. The assessments for 9 Medley Road show
three of the six windows falling below the 20% reduction test, these being W2/370,
W2/371 and W2/372.
4.19 The ADF assessment shows all the rooms will obtain good levels of daylight in theproposed condition with ADF values ranging between 1.46% and 3.40%. The rooms
served by windows W2/370, W2/371 and W2/372 obtain ADF values ranging between
1.5% to 1.91%, which meets or exceeds the ADF recommendations for bedrooms and
living rooms.
4.20 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.21 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
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4.22 The daylight and sunlight results show that the proposed development will retain a highlevel of daylight and sunlight, in excess of the BRE Guidelines. The occupants will not
experience a noticeable reduction in daylight or sunlight with the proposed
development in place.
1-7 Medley Road
4.23 These properties have windows that take an oblique view across the development siteand we have assessed 7 Medley Road to demonstrate the likely daylight and sunlight
effects. Drawing BRE/19 shows the contour results and location plan at Appendix 1.
The window sizes and locations to the rear of this property has been estimated as
access was restricted.
4.24 The south facing elevation of 7 Medley Road does not appear to contain anyhabitable rooms, although there is a rear extension set back from the site boundary
that appear to have windows facing the development site.
4.25 The VSC assessment results for 7 Medley Road show two of the fifteen windows fallingbelow the 20% reduction test, these being W5/350 and W6/350. All the other windows
tested will achieve a VSC over 27% or have a reduction in daylight less than 20%.
4.26 The ADF assessment shows all the rooms will obtain good levels of daylight in theproposed condition with ADF values ranging between 1.52% and 3.95%. The room
served by windows W5/350 and W6/350 obtain an ADF value of 1.52%, which exceeds
the ADF recommendations for bedrooms and living rooms. It is most probable that this
room would not be this size and would be subdivided into smaller ancillary rooms, but
for the purposes of this assessment we have sought to review a worst case condition.
4.27 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.28 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
4.29 The daylight and sunlight results show that the proposed development will retain a highlevel of daylight and sunlight, in excess of the BRE Guidelines. The occupants will not
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experience a noticeable reduction in daylight or sunlight with the proposed
development in place.
166-184 (Even) Iverson Road
4.30 These properties are located to the north of the development site with windows on therear elevation facing towards the development site. Drawing BRE/18 shows the
contour results and location plan at Appendix 1. The window sizes and locations to the
rear of these properties have been estimated.
4.31 The VSC assessment results for 178-180 Iverson Road show all the windows will achieve aVSC over 27% or have a reduction in daylight less than 20%.
4.32 The ADF assessment shows all the rooms will obtain good levels of daylight in theproposed condition with ADF values ranging between 1.65% and 2.68%.
4.33 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.34 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
4.35 The daylight and sunlight results show that the proposed development will retain a highlevel of daylight and sunlight, in excess of the BRE Guidelines. The occupants will not
experience a noticeable reduction in daylight or sunlight with the proposed
development in place.
188-190 Iverson Road
4.36 These collection of properties are commercial and therefore do not require assessmentwith regard to daylight/sunlight impacts, in accordance with the BRE Guidelines.
1-28 Rowntree Close
4.37 These are relatively newly built residential properties that have an indirect view of thedevelopment site. For 6, 14, 21 and 28 Rowntree Close these properties are closer to
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the development site and have blank south facing elevations with no windows facing
towards the development site.
4.38 We have reviewed used the Z map model as a basis, counting brick courses in order tolocate and position the windows. We have assessed the daylight and sunlight results to
6, 14, 21 and 28 Rowntree Close in order to evaluate the effects from the proposed
development. These properties are closest to the development site and should
represent the worst case conditions. Drawing BRE/16 and 17 show the contour results
and location plan at Appendix 1.
4.39 The VSC assessment results for 6, 14, 21 and 28 Rowntree Close show all the windows willachieve a VSC over 27% or have a reduction in daylight less than 20%.
4.40 The ADF assessment shows all the rooms will obtain good levels of daylight in theproposed condition with ADF values ranging between 1.07% and 7.48%. There is only
one room that obtains an ADF lower than the 1.5% benchmark, this being R2/331 which
obtains a value of 1.07%. This room is located at first floor level and therefore should
serve a bedroom. The suggested ADF level for a bedroom is 1.0% so the ADF in the
proposed condition exceeds this level, passing the BRE guidelines.
4.41 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.42 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
4.43 The daylight and sunlight results show that the proposed development will retain a highlevel of daylight and sunlight, in excess of the BRE Guidelines. The occupants will not
experience a noticeable reduction in daylight or sunlight with the proposeddevelopment in place.
202-220 Iverson Road
4.44 These properties are located to the north of the development site with windows on therear elevation facing towards the development site. Drawing BRE/18 shows the
contour results and location plan at Appendix 1. The window sizes and locations to the
rear of these properties have been estimated.
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4.45 It is most likely that the small windows serve non habitable rooms such as bathrooms,which would not normally require assessment. However, in order to provide results we
have modelled and run assessments, assuming room sizes.
4.46 The VSC assessment results for 206-208 Iverson Road show all the windows will achieve aVSC over 27%.
4.47 The ADF assessment shows low levels of daylight due to the small window sizes.However, the existing condition is also very low and the reduction in daylight is not
noticeable with reductions ranging between 3.17% to 5.23%.
4.48 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.49 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
4.50 The daylight and sunlight results show that the proposed development will retain agood level of daylight and sunlight, in excess of the BRE Guidelines. The occupants will
not experience a noticeable reduction in daylight or sunlight with the proposed
development in place.
Hampstead West 224 Iverson Road
4.51 This is a collection of commercial properties located to the north of the developmentsite. As these properties are commercial use, daylight and sunlight assessments are not
required.
1-10 Redcroft 226 Iverson Road
4.52 These properties are located on the corner of Iverson Road and West End Lane. Thesouth facing elevation does not appear to contain any residential use or windows that
need assessing.
4.53 It is the west facing elevation that is likely to contain residential use, with an obliqueview of the development site. We have assessed the windows closest to the
development site in order to evaluate the effects from the proposed development.
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Drawing BRE/16 shows the contour results and location plan at Appendix 1. The
window sizes and locations to the rear of these properties have been estimated.
4.54 The VSC assessment results for 1-10 Redcroft show all the windows will achieve a VSCover 27%.
4.55 The ADF assessment shows all the rooms will obtain good levels of daylight in theproposed condition with ADF values ranging between 2.36% and 2.58%.
4.56 The No Skyline assessment demonstrates that the occupants of all the rooms will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.57 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
4.58 The daylight and sunlight results show that the proposed development will retain a highlevel of daylight and sunlight, in excess of the BRE Guidelines. The occupants will not
experience a noticeable reduction in daylight or sunlight with the proposed
development in place.
124-136 West End Lane
4.59 At first floor level and above we consider there is residential use and as these windowsface towards the development site, daylight and sunlight assessments were
undertaken.
4.60 We have had to estimate the window sizes by counting brick courses and estimatingthe room layouts and uses. We have modelled and tested 130 West End Road with the
results shown on drawing BRE/16.
4.61 The VSC assessment results for 130 West End Road show all the windows will achieve aVSC over 27%.
4.62 The ADF assessment shows the room will obtain a good level of daylight in theproposed condition with an ADF value of 2.77%.
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4.63 The No Skyline assessment demonstrates that the occupants of the room will notexperience a noticeable reduction in daylight when comparing the existing and
proposed conditions.
4.64 The sunlight assessments demonstrate that all the windows will greatly exceed the BREGuidelines in the proposed condition.
4.65 The daylight and sunlight results show that the proposed development will retain a highlevel of daylight and sunlight, in excess of the BRE Guidelines. The occupants will not
experience a noticeable reduction in daylight or sunlight with the proposed
development in place.
--------------------------------
Internal Daylight Assessment for the Proposed Habitable
Rooms
4.66 The internal daylight assessments have been undertaken for the lowest habitable roomsat lower ground, podium, mezzanine and first floor level. These assessments have been
undertaken for each building with the tabled results and contour drawings on BRE/01-
13 at Appendix 1.
4.67 The Average Daylight Factor tests have assumed a window transmittance value of 0.55which is a greater transmittance value than a standard double glazed unit. This is due
to the requirement for noise attenuation as the site is next to the railway line. We have
used an average internal reflectance value for mid range walls, ceilings and floors. For
living/dining/kitchen areas we consider the ADF level of 1.5% or higher is a good level
of daylight to be achieved.
4.68 The proposed internal assessments have reviewed the Average Daylight Factor, Noskyline and Annual Probable Sunlight Hours. We consider for new developments that
the Average Daylight Factor test is best qualitative assessment for adequacy and
summarize the results for each building below:
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Building A
4.69 The results to Building A demonstrate that all the rooms pass the Average DaylightFactor test, obtaining an ADF higher than the suggested value for its use.
Building B
4.70 The results to Building B demonstrate that one room out of eleven tested falls below theAverage Daylight Factor test, achieving an ADF of 1.05% rather than 1.5% for a living
room. Of the 75 habitable rooms within Building B only having one room falling below
the recommended ADF value only equates to 1.33%, with 98.67% compliant.
Building C
4.71 The results to Building C demonstrate that all the rooms pass the Average DaylightFactor test, obtaining an ADF higher than the suggested value for its use.
Building D
4.72 The results to Building D demonstrate that all the rooms pass the Average DaylightFactor test, obtaining an ADF higher than the suggested value for its use.
Building E
4.73 The results to Block E demonstrate that one room out of thirty one tested fall below theAverage Daylight Factor, achieving an ADF of 0.66% rather than 2.0% for a kitchen. Of
the 91 habitable rooms within Building E only having one room fall below the
recommended ADF value only equates to 1.10%, with 98.90% compliant.
Building F
4.74 The results to Building F demonstrate that all the rooms pass the Average DaylightFactor test, obtaining an ADF higher than the suggested value for its use.
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Summary of Internal Daylight Assessment
4.75 The assessments to each block has demonstrated a good level of compliance isobtained and that at the upper floor level total compliance with the ADF test will be
achieved. In the context of the 435 habitable rooms being provided within this
development only having two rooms below the BRE Guideline recommendations only
equates to 0.46%, which also equates to 99.54% of the habitable rooms passing the BRE
Guideline recommendations.
--------------------------------
Overshadowing Assessment
4.76 The permanent overshadowing assessment results are shown on drawing BRE/22 atAppendix ii. The transient overshadowing images have also been appended to this
report, showing the sunlight tracking within the assessment month of March.
4.77 The assessment of the individual gardens is shown on drawing BRE/22, together with areference that correlates to the table below. The assessments to the gardens have
included a 1.8m high solid fence as from site inspection this appeared to be the casefor the majority of the gardens. The rear gardens of the Medley Road properties were
not able to be seen due to restricted access.
Area AssessedProposed % in
Sun
Existing % in
SunArea Assessed
Proposed % in
Sun
Existing % in
Sun
1 48.98 49.98 2 49.30 49.30
3 65.79 67.43 4 60.96 61.05
5 55.88 58.25 6 54.94 58.84
7 54.08 58.04 8 54.03 59.00
9 41.48 50.29 10 34.38 64.23
11 50.40 50.40 12 40.35 40.35
13 49.67 49.67 14 34.98 34.98
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15 40.99 40.99 16 52.44 52.44
17 37.09 37.09 18 38.92 38.92
19 39.49 39.49 20 40.08 40.08
21 40.18 40.18 22 40.43 40.43
23 43.71 43.71 24 46.94 46.94
25 62.89 62.89 26 53.69 53.69
27 51.85 51.85 28 52.49 52.49
29 54.28 54.28 30 49.91 49.91
31 62.18 62.18 32 41.81 41.81
33 42.66 42.66 34 41.21 41.21
35 37.25 37.25 36 28.55 28.55
37 30.13 30.13 38 50.57 50.57
4.78
The overshadowing assessment to the neighbouring gardens demonstrates that onlyareas 3-10 will experience any diminution in permanent overshadowing. Areas 3, 4, 5,
6, 7, 8 and 9 will have reductions in sunlight that will not be noticeable as they are
within the 20% reduction when comparing the existing and proposed conditions.
4.79 Area 10 has a reduction in sunlight below the 20%, when comparing the existing andproposed conditions. The majority of the sunlight obstruction is due to the 1.8m high
fence and if the fences were lower or has a lattice effect the sunlight penetration
would pass the BRE guidelines in the proposed condition.
4.80 We consider the effects of the proposed development would not render the gardenuninhabitable and high levels of sunlight will be obtained at 11am and noon. It is
noted that the effects of the proposed development is no different to the effect from 1
Medley Road on the gardens to 176-168 Iverson Road.
4.81 The transient overshadowing images demonstrate that the proposed podium levelsand play ground areas will obtain sunlight throughout the day, obtaining no
permanent overshadowing effects.
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Ballymore Properties Group and Network Rail Assessment Summary
November 2011 gva.co.uk 21
5. Summary5.1 The daylight and sunlight assessments to the neighbouring residential properties have
demonstrated that there will be a good level of daylight and sunlight retained in the
proposed condition. The development site currently has low level small buildings and
therefore a comprehensive redevelopment of this site will reduce some daylight and
sunlight when comparing the existing and proposed conditions. The daylight and
sunlight assessments to the neighbouring properties have demonstrated that the
occupants will not experience a noticeable reduction in daylight or sunlight.
5.2 The overshadowing assessment has demonstrated that all but one of the neighbouringgardens and all the proposed amenity areas pass or exceed the BRE Guidelines,
ensuring good levels of sunlight will be retained with the proposed development in
place. The one rear garden that falls below the BRE guideline is mostly overshadowed
by the assumed 1.8m high solid fence. If the fence were not 1.8m high and of solid
construction then the garden will pass the BRE guidelines.
5.3 The internal daylight assessments to the proposed habitable rooms have demonstratedthat a good level of compliance will be achieved with the proposed development
being in place. In the context of the 435 habitable rooms being provided in thisdevelopment only 0.46% fall below the recommended ADF for their use. We consider
this is a small proportion in the context of what is being provided and it is not
uncommon to have some rooms below the BRE Guideline recommendations for high
density developments.
5.4 The design of the proposed buildings have allowed light to permeate through so as tolimit the effects of daylight and sunlight on the neighbouring properties, whilst ensuring
that future occupants within the development obtain good daylight and sunlight.
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Report
Appendices
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Report
Appendix I
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Report
Appendix IIAppendix II
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March 21 8am
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March 21 11am
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March 21 1pm
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March 21 2pm
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March 21 5pm
March 21 6pm
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