Company lists · Data refreshed October 2026

Top 25 Infrastructure design consultancies based in Seattle, United States

Name: Infrastructure design consultancies based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 69 companies tracked

RevenueBase identified 69 company matches for infrastructure design consultancies associated with Seattle, United States as of October 2026 and tracks 6,269 professional contacts across them, including 4,021 with verified work emails. Across the United States, Houston is the largest hub for this category (242 companies); Seattle has 69.

This list covers company matches for infrastructure design consultancies associated with Seattle, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 1, 2026 How this list was built

69Companies

6,269Contacts tracked

4,021Verified emails

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The 25 largest infrastructure design consultancies based in Seattle, United States

Ranked by team size

Top 25 of 69 company matches for infrastructure design consultancies based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Kpff Consulting Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	1,001-5,000	1,487 contacts →
	Exact match “KPFF is a multi-office, multi-discipline engineering firm.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Parametrix	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	501-1,000	880 contacts →
	Exact match “At Parametrix, we help our clients imagine what's possible.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Coffman Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	501-1,000	859 contacts →
	Exact match “The right team is more than an advantage.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	DCI Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	201-500	404 contacts →
	Exact match “DCI Engineers has been providing client-focused structural and civil engineering services for over three decades.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	Delve Underground	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	201-500	311 contacts →
	Exact match “Delve Underground is a leader in heavy civil engineering, serving the transportation, water, wastewater, and energy industries.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Mithun	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	287 contacts →
	Exact match “Mithun is an integrated design firm dedicated to creating positive change in people’s lives.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Magnusson Klemencic Associates	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	190 contacts →
	Exact match “We engineer the future of the built environment, one structure, skyline, and community at a time.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Hargis Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	201-500	188 contacts →
	Exact match “Hargis Engineers is a mechanical, electrical, telecommunications, security, energy consulting engineering, and commissioning firm.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Harris Group	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	178 contacts →
	Exact match “Harris Group is a multidiscipline engineering consulting firm with offices located throughout the United States.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	Herrera Environmental Consultants	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	176 contacts →
	Exact match “Herrera Environmental Consultants is a leading engineering and scientific consulting firm focused on restoration, water, and sustainable development.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Perteet INC	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	126 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Gglo Design	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	115 contacts →
	Exact match “GGLO is an integrated design firm that provides architecture, urban design, planning, research, interior design, and landscape architecture to clients around the world.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	BHC Consultants	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	109 contacts →
	Exact match “BHC Consultants, LLC (BHC) is an employee owned and managed consulting, engineering, building code and construction compliance, and planning firm with offices in Seattle and…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Gray & Osborne	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	99 contacts →
	Exact match “Municipal Engineering Services” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	R.W. Beck	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	501-1,000	84 contacts →
	Exact match “R.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	KPG	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	51-200	66 contacts →
	Exact match “KPG was initially formed in 1990 by a team of engineers, architects, landscape architects, and urban designers committed to and focused on community-driven public projects.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	ABKJ	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	65 contacts →
	Exact match “Andersen Bjornstad Kane Jacobs (ABKJ) is a premier consulting design firm in the United States.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	HBB Landscape Architecture	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	34 contacts →
	Exact match “HBB is a 20 person professional Landscape Architecture, Urban Design, and Planning firm located in Downtown Seattle.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	MIG SVR	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	201-500	29 contacts →
	Exact match “SvR Design Company was founded in 1989 with a mission of providing innovation in the built environment.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	WJA Design Collaborative	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	22 contacts →
	Exact match “WJA Design Collaborative, established in 1968 as Whiteley Jacobsen Associates, has provided architectural and engineering services to Federal clients and private contractors…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	Delta E Consulting	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	22 contacts →
	Exact match “At Delta E, we specialize in a diverse range of consulting services, including Sustainability, Carbon consulting, Energy services, and design expertise in Mechanical, Electrical…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Quantum Consulting Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	22 contacts →
	Exact match “Quantum Consulting Engineers offers structural engineering services for new and existing buildings, including new construction, tenant improvements, renovation, and historic…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	Pacland	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	1-10	20 contacts →
	Exact match “Founded in 1994, PACLAND is recognized as a leading site development consulting/engineering firm based in Seattle and serving the western US.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	LPD Engineering Pllc	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	19 contacts →
	Exact match “Improving our communities through economical, functional and sustainable civil design solutions.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Integrated Design Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 1, 2026	11-50	16 contacts →
	Exact match “Integrated Design Engineers (idE) is a Seattle-based structural engineering consulting firm founded in 2005.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “infrastructure design consultancies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 69 infrastructure design consultancies based in Seattle, United States

See the full list, filter by size, metro and specialty, and access 4,021 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Infrastructure design consultancies based in Seattle, United States at a glance

As of Oct 1, 2026

64.1%Verified-email coverage

90.9Average contacts per company

11-50Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 69 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Seattle, United States whose business descriptions match “infrastructure design consultancies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 4,021 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 1, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Infrastructure design consultancies by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “infrastructure design consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many infrastructure design consultancies are there based in Seattle, United States?

RevenueBase identified 69 company matches for infrastructure design consultancies associated with Seattle, United States as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Kpff Consulting Engineers tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most infrastructure design consultancies?

Houston leads the United States with 242 company records, followed by New York (233) and Chicago (126). Seattle has 69.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 4,021 professional contacts with verified work emails tracked across these 69 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.