Companies are ranked according to revenue for design services performed in 2007 in $ millions (*). Those with subsidiaries are indicated by (†). Firms not ranked last year are designated **. Some markets may not add up to 100% due to omission of "other" miscellaneous market category and rounding. NA=Not available.

Key to type of Firm: A=architect; E=engineer; EC=engineer-contractor; AE=architect-engineer; EA=engineer-architect; ENV=environmental; GE=geotechnical engineer; L=landscape architect; P=planner; O=other. Other combinations possible. Firms classified themselves.

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Click below for more 2015 Top Design Firms Sectors:
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Education/Research

Rank	Firm	$ Mil.
1	Ayers Saint Gross	24.00
2	Stantec	15.70
3	Grimm + Parker Architects	13.59
4	Crabtree, Rohrbaugh & Associates	11.16
5	GWWO Inc./Architects	8.68
6	Clark Nexsen	7.57
7	Timmons Group	7.00
8	KCI Technologies Inc.	6.50
9	AECOM	5.91
10	Design Collective Inc.	5.00
11	Cooper Carry Inc.	4.08
12	Perkins Eastman	4.04
13	Johnson, Mirmiran & Thompson Inc.	3.68
14	Dewberry	3.64
15	SCHRADERGROUP architecture	3.10
16	Gensler	2.64
17	Perkins+Will	2.63
18	EwingCole	2.60
19	Becker Morgan Group Inc.	2.57
20	WDG Architecture	2.08

General Building

Rank	Firm	$ Mil.
1	AECOM	192.90
2	Gensler	79.85
3	SmithGroupJJR	54.52
4	EwingCole	50.01
5	Stantec	49.34
6	ECS Mid-Atlantic LLC	42.32
7	WSP | Parsons Brinckerhoff	37.42
8	Michael Baker international	33.53
9	Pennoni	33.15
10	Ayers Saint Gross	30.08
11	Timmons Group	29.87
12	Page	29.07
13	Clark Nexsen	28.03
14	Shalom Baranes Associates	27.46
15	ARCADIS/RTKL/Callison	27.21
16	Whitman, Requardt & Associates LLP	25.16
17	Grimm + Parker Architects	24.49
18	Perkins+Will	21.71
19	Dewberry	21.16
20	Design Collective Inc.	18.30

Commercial

Rank	Firm	$ Mil.
1	Gensler	36.89
2	ECS Mid-Atlantic LLC	24.61
3	NELSON	10.33
4	Perkins+Will	9.35
5	Shalom Baranes Associates	8.83
6	AECOM	7.43
7	VOA Associates Inc.	7.10
8	SmithGroupJJR	5.72
9	Gannett Fleming	5.42
10	Dewberry	4.38
11	Michael Baker international	4.31
12	Timmons Group	4.00
13	WSP | Parsons Brinckerhoff	3.68
14	Langan Environmental & Engineering Services	3.56
15	Soltesz	3.50
16	WDG Architecture	3.31
17	Stantec	3.10
18	Whitman, Requardt & Associates LLP	2.76
19	Baskervill	2.53
20	Arup	2.23
21	Page	2.13
22	PVE Sheffler LLC	2.09
23	Clark Nexsen	1.94
24	The Thrasher Group Inc.	1.90
25	Wiss, Janney, Elstner Associates Inc.	1.81

Government/Public Service

Rank	Firm	$ Mil.
1	AECOM	116.93
2	SmithGroupJJR	31.98
3	Michael Baker international	27.70
4	Page	26.54
5	Whitman, Requardt & Associates LLP	19.85
6	Timmons Group	18.50
7	Gensler	18.47
8	Cardno	17.16
9	Clark Nexsen	14.51
10	EwingCole	12.02
11	Shalom Baranes Associates	12.01
12	ARCADIS/RTKL/Callison	10.72
13	Dewberry	6.43
14	KCI Technologies Inc.	6.00
15	STV	5.09
16	Atkins North America	4.67
17	GAI Consultants Inc.	4.22
18	RS&H Inc.	2.39
19	ECS Mid-Atlantic LLC	2.30
20	WDG Architecture	1.75
21	Ayers Saint Gross	1.65
22	Loring Consulting Engineers Inc.	1.63
23	Grimm + Parker Architects	1.63
24	SCHRADERGROUP architecture	1.52
25	VOA Associates Inc.	1.38

Multi-Unit Residential

Rank	Firm	$ Mil.
1	AECOM	24.95
2	Design Collective Inc.	11.60
3	WDG Architecture	9.21
4	Shalom Baranes Associates	5.73
5	Grimm + Parker Architects	5.70
6	ECS Mid-Atlantic LLC	3.40
7	Kimley-Horn	2.71
8	Wiss, Janney, Elstner Associates Inc.	2.58
9	Wallace Roberts & Todd LLC	2.25
10	Davis, Bowen & Friedel Inc.	2.12
11	FXFOWLE Architects	2.08
12	Stantec	1.74
13	ARCADIS/RTKL/Callison	1.73
14	Civil & Environmental Consultants Inc.	1.66
15	WSP | Parsons Brinckerhoff	1.62