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New Building Regulations L1
Presented by Robert Eglington
Regional Director of MLM Building Control
New Building Regulation L1
The new Regulations have been published and the approved documents are currently in draft form only
The proposed date of implementation of the changes is April 6 2006
We understand the Statutory Instrument and final documents will be published in March 2006
New Building Regulation L1
The ODPM issued the 300 page consultation document in July 2004
They invited comment from across the entire building industry including all professional bodies
The document was made up of 12 sections
New Building Regulation L1
Section 1 – Regulatory impact assessment
Section 2 – New document ADL1A Section 3 – New document ADL1B Section 4 – New document ADL2A Section 5 – New document ADL2B Section 6 – Possible future
performance standards
New Building Regulation L1
Section 7 – Implementation of the Energy Performance of Buildings Directive
Section 8 – Calculations methodologies of the Energy Performance of Buildings Directive
Section 9 – Adaptation Strategy Section 10 – Dissemination strategy
New Building Regulation L1
Section 11 – Code of practice on consultation
Section 12 – Response form
New Building Regulation L1
Draft regulatory impact assessment An assessment of national benefits An assessment of costs on certain
building types An indication of the impact on certain
buildings An explanation of the reasons behind the
proposed changes
New Building Regulation L1
Draft regulatory impact assessment Purpose – “to further improve the energy
efficiency of buildings in response to the aim declared in the Energy White Paper and the aims set out in article 1 of the Energy Performance of Buildings Directive”
Background – the 2002 changes increased thermal performance by 25% at a increased cost of up to 3% on construction
New Building Regulation L1
Draft regulatory impact assessmentEnergy White Paper To achieve substantial reductions in CO2
emissions Encouragement to improve in energy
efficiency Encouragement of the selection of
energy sources and generating technologies that produce much less, or no, carbon
New Building Regulation L1
Draft regulatory impact assessmentEnergy White Paper The target is to achieve a 60% reduction
in carbon emissions by 2050 Buildings account for 50% of UK carbon
emissions Savings in the construction of new
buildings and to the upgrading of the existing stock can therefore be significant
New Building Regulation L1
Draft regulatory impact assessmentEnergy White Paper The plan is also for the future with a
review every 5 years Work has already commenced on the
proposals for 2010 to 2020
New Building Regulation L1
Draft regulatory impact assessmentOptions Option 1 – Do nothing Option 2 – Information and Education Option 3 – Amending Part L of the
Building Regulations
New Building Regulation L1
Draft regulatory impact assessmentPreferred choice – Option 3 Amending the Building Regulations Introducing other legislation to complete
the transposition of the other elements of the EPBD - The Sustainable and Secure Buildings Act
Supportive training programme
New Building Regulation L1
Draft regulatory impact assessment Extra costs for dwellings are estimated
as being from £323 for flats to £1170 for a detached dwelling
Increased costs for commercial work are estimated at £19/m² and £7/m² for industrial buildings – these costs do not include ‘Consequential Improvements’
New Building Regulation L1
Draft ADL1A Work in new dwellings The new SAP 2005 will be the only way of
showing compliance Elemental and target U values will no
longer be permissible as ways of showing compliance
New Building Regulation L1
Draft ADL1A Work in new dwellings The new SAP will be a transparent calculation
that will remove the ability of designers and checkers to interpret the guidance
There will be minimum U values imposed to constrain design opportunities
Sample air pressure testing will be imposed in a similar way to sound testing - major Housebuilder objections!
There may be a ‘Robust Option’ as an alternative to the pressure testing regime
New Building Regulation L1
Draft ADL1A Work in new dwellingsThe 5 criterion to showing compliance that
will need to be followed are1. Predicted carbon dioxide emission from
proposed dwelling does not exceed the target
New Building Regulation L1
Draft ADL1A Work in new dwellings2. The performance of the building fabric
and the heating, hot water and fixed lighting systems should be no worse than the design limits
3. The dwelling has appropriate passive control measures to limit solar gains
4. The performance of the dwelling, as built, is consistent with the Dwellings Emissions Rate
New Building Regulation L1
Section 2 – Draft ADL1A Work in new dwellings
5. The necessary provisions for energy efficient operation of the dwelling are put in place
New Building Regulation L1
Draft ADL1A Work in new dwellingsLimiting U Value standards (W/m²K)
Element Area-weighted dwelling average
Worst individual sub-element
Wall 0.35 0.45
Floor 0.25 0.45
Roof 0.25 0.35
Windows, rooflights, doors etc
2.2 3.3
New Building Regulation L1
Draft ADL1A Work in new dwellings The air pressure test standard will be set at
10m³/m² per hour at 50 Pa There will be a honeymoon period for failure to
meet this standard until 31 October 2007 Testing arrangements will be split into those
using and those not using accredited construction details
Those that have adopted accredited construction details - a pressure test should be carried out on each dwelling type
New Building Regulation L1
Draft ADL1A Work in new dwellingsDwellings that have not adopted accredited
construction detailsTesting to be minimum ofa. 2 units of each dwelling type in the
developmentb. 5% of each dwelling type – can be reduced to
2% if the testing was successful on the first 5 dwellings tested
c. The sample to concentrate in the earlier completed dwellings of each type
New Building Regulation L1
Draft ADL1B Work in existing dwellings Type of work covered by the approved document Extensions Creating a new dwelling through a material change of
use Material alterations to existing dwellings The provision of a controlled fitting The provision or extension of a controlled service The provision or renovation of a thermal element
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellingsLimiting U-value standards (W/m²°K) for small elementsEg Metre box scenario
Element Limiting U-value
Wall 0.70
Floor 0.70
Roof 0.35
Windows, Doors etc 3.30
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellingsStandards for thermal elements (W/m²°K)
Element Standards for new elements in an extension
Standards for replacement elements in an existing dwelling
Wall 0.30 0.35
Pitched roof – insulation at ceiling level
0.16 0.16
Pitched roof – insulation between rafters
0.20 0.20
Flat roof or roof with integral insulation
0.20 0.25
Floors 0.22 0.25
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings
Window areas are restricted to 25% of the floor area of the extension plus the area of any windows or doors which, as a result of the extension works, no longer exist or are no longer exposed
Special options will be made to allow for conservatory type extensions
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellings Replacement boilers to be of a condensing type or
traditional in some limited existing circumstances Guidance is given on solar heating systems Recommendations are made on water treatment in
heating systems in hard water areas Additional controls for high efficiency luminaires
New Building Regulation L1
Section 3 – Draft ADL1B Work in existing dwellingsHistoric BuildingsSpecial considerations can apply to Listed buildings Buildings in a conservation area Buildings of local architectural or historic interest Buildings within National Parks, areas Outstanding
National Beauty and World Heritage sites
New Building Regulation L1
Draft ADL1B Work in existing dwellingsRenovation of thermal elements Where more than 25% of the surface area of
a thermal element is being renovated, a way of showing compliance with the regulation would be to upgrade the whole element in question
New Building Regulation L1
Section 4 – Draft ADL2A Work in new buildings other than dwellings
The proposal is to raise the overall standard of energy performance by about 27%
The elemental approach to design will no longer be acceptable
A nationally agreed methodology to achieve an overall energy performance standard must be adopted
New Building Regulation L1
Section 4 – Draft ADL2A Work in new buildings other than dwellings
The proposed methodology will be more flexible and building specific - SBEM
The flexibility in the methodology will be constrained by a series of poorest acceptable benchmarks
The use of LZC heating systems are allowed for and compensation for their use are within the calculation method
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
The proposals make pressure testing a legal requirement
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
New regulations will be drafted requiring submission of certificates for the building and its systems
New regulations will be drafted requiring regular inspection of air-conditioning systems and the submission of reports
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
The calculation method for energy will a comparative study against the notional building
The carbon improvement in buildings will be up to 20% with a further 10% allowance if no LZC energy systems are adopted
The air pressure test standard remains at 10m³/m²h at 50 Pa
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings – Table 4, limiting U-value standards
Element Area weighted average value - U value W/m²K
For any individual element – U value W/m²K
Wall 0.35 0.7
Floor 0.25 0.7
Roof 0.25 0.35
Windows* and rooflights
2.2 3.3
High usage entrance doors
6.0 6.0
Vehicle access 1.5 4.0
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
A failure to meet air permeability tests can be made up for by re-examining the energy standard calculation and making any necessary adjustments
There will be honeymoon period for the testing of buildings under 1000m² until 31 October 2007.
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
As an alternative to air pressure testing on buildings under 500m² an allowance of 15m³/m²h at 50 Pa can be used in the energy calculation method. Compensatory features can then be installed
Large, complex buildings may be subjected to an alternative approach to air pressure testing
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
There will be a 5 step approach for compliance applicable to new buildings
1. Predicted carbon dioxide emissions from the proposed building does not exceed the target
2. The performance of the building fabric and the building services system should be no worse than the design limits
3. The building has appropriate passive control measures to limit solar gains
New Building Regulation L1
Draft ADL2A Work in new buildings other than dwellings
4. The performance of the building, as built, is consistent with the Building Emission Rate
5. Providing information
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Types of work covered include; Consequential improvements An extension A material change of use A material alteration The provision or extension of a controlled service or
fitting The provision or renovation of a controlled element
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Where the work involves the first fit-out of a ‘shell’ constructed under these guidelines the design should be as if it were all ‘new-build’
Allowances are made for ‘Historic buildings’
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Consequential Improvements - Regulation 17D.-(1) applies to a building with a total useful floor area over 1000m² where the building work includes an extension, fixed building services or an increase to the capacity of any fixed building services
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Where this regulation applies, such work, if any shall be carried out to ensure that the building complies with the requirements of Part L – see Table 7 for trigger values
The regulation does not require anything to be done that is not technically, functionally and economically feasible – this has been defined
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Element Threshold value Improved value
Cavity wall 0.70 0.55
Other wall type 0.70 0.35
Floor 0.7 0.25
Pitched roof ceiling level 0.35 0.16
Pitched roof between rafters
0.35 0.2
Flat roof 0.35 0.25
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Consequential improvements include; Where there is in increase in the installed
capacity of heating or cooling plant -To upgrade any thermal element served by the
plant with increased capacity To replace any existing window or door within the
area served by the plant with increased capacity
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
There is no limit to the value of this work where there is an increase in the installed capacity of the plant, only that it must be cost effective – the 10% capital value rule does not apply
If the value of this work exceeds 10% then further consequential improvements are not required
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
In addition the 10% rule, based on the value of the principal works, applies and requires certain other elements in addition to those previously mentioned, to be upgraded including
Heating and cooling systems more than 15 years old need to be upgraded or replaced
Inefficient lighting systems, to install energy metering The provision of an LZC energy system as long as a 7 year
simple payback can be shown
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
When carrying out a Material Change of Use reasonable provision would be to include;
Replacement windows Controlled upgrading of any renovated
thermal elements
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
For extensions over 100m² and greater than 25% of the existing building ADL2A should be adopted – this currently includes air pressure tests
For extensions less than 100m² alternative values given below should be adopted
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Element Standard for new elements in an extension
Standard for replacement elements in an existing building
Wall 0.30 0.35
Pitched roof – insulation at ceiling level
0.16 0.16
Pitched roof – insulation between rafters
0.20 0.20
Flat roof with integral insulation
0.20 0.25
Floors 0.22 0.25
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Windows – see table below OR the ratio that is present in that part of
the existing building to which the extension is to be joined
New Building Regulation L1
Draft ADL2B Work in existing buildings other than dwellings
Building type Windows and personnel doors as a % of the exposed wall
Rooflights as a % of the area of the roof
Residential buildings 30 20
Places of Assembly, offices and shops
40 20
Industrial and storage buildings
15 20
Vehicle access doors and display windows
As required N/A
New Building Regulation L1
The future Our proposed standards are still lower than some
other EU countries – e.g. Denmark and Switzerland
Aspirational U values for 2010Item Indicative U value
Roof 0.1
Wall 0.2
Windows, doors etc 1.4
Floors 0.2
New Building Regulation L1
The future Air permeability standards are likely to be reduced
to 5 or 7m³/m²h to bring us into line with standards currently in operation in countries such as Germany and Holland
It should be noted that in Switzerland the current standard is set at 3.6 m³/m²h
New Building Regulation L1
ImplementationTransitional provisions These have not yet been confirmed and we
await further advice from the ODPM
New Building Regulation L1
Any Questions?