Results third quarter and first nine months 2005 Harrie Noy, CEO ARCADIS NVNovember 9, 2005

Excellent third quarter

• Net income +36%; net income from operations +46%

• Gross revenue growth 7%, of which 5% organically

• Strong growth in U.S. environment and in Brazil • Strong margin improvement: 8.0% versus 5.7% last year

• Acquisitions/divestments also contribute to profit improvement

• Profit outlook for 2005 increased to 30 – 35%

Strategy to improve margins is paying off

Net income third quarter 2005: € 6.3 million

Gross revenue

Ebita

Net income

Net income per share 1)

Net income from operations 2)

Ditto per share 1,2)

1) 2005 based on 20.3 million shares outstanding (2004: 20.1 million)

2) Excluding amortization, pension adjustments and non-recurring items consisting of book profits and reorganization charges in 2004 and book profits in 2005

2005

236

13.0

6.3

0.31

7.5

0.37

2004

221

5.6

4.6

0.23

5.1

0.25

7%

133%

36%

36%

46%

46%

Net income 9 months 2005: € 20.8 million

Gross revenue

Ebita

Net income

Net income per share 1)

Net income from operations 2)

Ditto per share 1,2)

1) 2005 based on 20.3 million shares outstanding (2004: 20.1 million)

2) Excluding amortization, pension adjustments and non-recurring items consisting of book profits and reorganization charges in 2004 and book profits in 2005

2005

692

38.5

20.8

1.03

20.8

1.02

2004

652

22.8

14.8

0.74

15.8

0.79

6%

68%

41%

40%

31%

30%

Increased focus in portfolio

Divestments• Detailed engineering buildings, U.S.• 50% interest in Grupo EP, Spain• Renardet/Sauti in donor-funded market

Book profit in Q2: € 2.1 million (net)

Acquisitions• SWK, Belgium; infrastructure• AYH, U.K.; project management• Greystone, U.S.; environment• Blasland, Bouck & Lee, U.S.;

environment

PerApril 1

Mid-JuneEnd of June

Mid-May Mid-June

End of JuneEnd of September

Positive impact on margins

Major acquisition in the U.S.: Blasland, Bouck & Lee

• Gross revenue $170, net revenue $110

• Superior margins

• Leading environmental services provider

• 80% of revenues from industrial clients

• Combined top 5 world player in environment

• Leader in environmental services for industry

• Many opportunities for synergies - Services to BBL multinational clients globally - GRiP® approach for BBL clients - Client based business model as basis for integration

Industrial consultancy

Life sciences

Sediment remediation

Organic growth continues at good level

0%

2%

4%

6%

8%

10%

12%

2001 2002 2003 2004 2005-9M

Organic

Acquisitions/ divestments

Total (excl.currencyeffect)

Currency -2% -3% -3% -3% 0%

Selling prices - +2% +0% +1% -1%

Gradual recovery Dutch market

• Slight decline in gross revenues in Q3, but

• Profitability continues to improve due to restructuring in 04

• Backlog improved by >25% compared to year end 04

• More work on upgrading rail infrastructure

• Municipal market is picking up

• More PPS/PFI initiatives

• Facility management contract signed with DSM & Sabic

Dutch operations back on track

Impact of non recurring items on Ebita

Ebita

Reported

Non recurring

Recurring

2005

13.0

-

13.0

2004

5.6

-/-3.1

8.7

Q32005

38.5

2.1

36.4

2004

22.8

-/-4.5

27.3

Q3 YTD

Non recurring items 2004: book profits and restructuring charges

Non recurring items 2005: book profits

Growth in Ebita first nine months 2005

0

10

20

30

40

50

2004 2005

Ebita

0%

5%

10%

15%

20%

25%

30%

35%

40%

Currencies +1%

Acquisitions/divestments +13%

Organic +19%

Growth achieved +33%

Non-recurring

+ 68%Reported

+ 33%On recurring basis

Strong margin improvement from 5.8% to 7.4%

Gross revenue market segments Q3 YTD 2005

Facilities +5% (+6%)

0

100

200

300

400

2003 2004 2005

Infrastructure +8% (+3%)

0

100

200

300

400

2003 2004 2005

Environment +11% (+11%)

0

100

200

300

400

2003 2004 2005

Infrastructure56%

Facilities18%

Environment26%

Infrastructure +8% (+3%)

• Acquisitions contributed 4% (U.S., Poland, Belgium)• Strong growth in Brazil for both private and public sector• Growth in U.S. driven by land development• European market good in Poland, France, Belgium• Dutch market recovers; contract for prestigious Zuid-as A’dam

Environment +11% (+11%)

• Continued strong growth in U.S. GRiP® and traditional work• Contribution from acquisitions 2%, off set by currency impact • Acquisition of BBL major strategic step forward• In Poland, Brazil and Chile growth from private sector clients• Belgium and Germany also demonstrate growth

Facilities +5% (+6%)

• Acquisition AYH makes up for earlier divestments • Revenue decline in Q3 lower organic growth Q3 YTD• Less revenue in Q3 caused by shifts in subcontracting • Net revenue increased >10% organically in Q3• Facility management contract signed with DSM and Sabic

Geographic distribution of gross revenue

Netherlands33%

United States30%

Other European countries

28%Other countries

9%

2004 2005

Netherlands30%

United States32%

Other European countries

28%

Other countries10%

Outlook full year 2005

Most markets are favorable• European market solid particularly CentralEurope• U.S. and Brazilian market strong• Dutch market gradually recovering

Most units perform well

Outlook per market segment

Infrastructure

• SAFETEA to drive U.S. growth

• In Europe France and Poland good prospects

• Dutch market recovery expected to continue

Environment

• U.S. strong backlog basis for continued growth

• BBL client base offers international leverage

Facilities

• AYH good basis for worldwide project consulting

• Project and facility management well established

Profit outlook 2005 increased

• ARCADIS well positioned in growing markets

• Synergy contributes to growth

• Focus on margin improvement continues

• Synergy and integration BBL have high priority

• Net income from operations 30 to 35% higher

(barring unforeseen circumstances)

ARCADIS is well on track

Thank you