Company lists · Data refreshed October 2026

Top 23 Building systems consultants based in Seattle, United States

Name: Building systems consultants based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 9, 2026 31 companies tracked

RevenueBase identified 31 company matches for building systems consultants associated with Seattle, United States as of October 2026 and tracks 854 professional contacts across them, including 494 with verified work emails. Across the United States, New York is the largest hub for this category (193 companies); Seattle has 31.

This list covers company matches for building systems consultants 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 9, 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 9, 2026 How this list was built

31Companies

854Contacts tracked

494Verified emails

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The 23 largest building systems consultants based in Seattle, United States

Ranked by team size

Top 23 of 31 company matches for building systems consultants based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 9, 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	Hargis Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	201-500	192 contacts →
	Exact match “Hargis Engineers is a mechanical, electrical, telecommunications, security, energy consulting engineering, and commissioning firm.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
2	Harris Group	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	51-200	189 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 9, 2026 · View company records in RevenueBase
3	Säzän Group INC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	51-200	158 contacts →
	Exact match “Säzän Group is an engineering and consulting firm with offices in Washington, Oregon, and Arizona.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4	Neudorfer Engineers, LLC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	51-200	45 contacts →
	Exact match “Neudorfer Engineers is an integrated, multi-disciplinary firm with experts in a variety of project types.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5	ECO Electric, Plumbing, Heating & AIR	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	36 contacts →
	Exact match “Our skilled electricians, plumbers, and HVAC technicians are certified to handle all your home service needs, from repairs and safety inspections to new installations and…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
6	Mechanical Sales, INC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	29 contacts →
	Exact match “Incorporated in 1971, Mechanical Sales, Inc.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	Ecotope, INC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	28 contacts →
	Exact match “Ecotope has provided sustainable building design consulting and engineering services in the Pacific Northwest for over 40 years.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
8	Delta E Consulting	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	27 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 9, 2026 · View company records in RevenueBase
9	EBD Services	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	24 contacts →
	Exact match “EBD Services is committed to serving our clients and community as trusted partners.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
10	O'brien360	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	22 contacts →
	Exact match “O'Brien360 is a nationally recognized leader in the sustainable building community.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11	Modern Construction Services	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	22 contacts →
	Exact match “Modern Construction Services, LLC is a Certified Women’s Business Enterprise (WBE) and Certified Small Contractor and Supplier (SCS) providing services for a broad range of…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
12	4ea Building Science	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	20 contacts →
	Exact match “4EA Building Science is a full-service design consultancy that specializes in the design, construction, and rehabilitation of building enclosures.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13	KE AD Building Consultants Kent Engineering Architectural Diagnostics	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	10 contacts →
	Exact match “KE\|AD (Kent Engineering \| Architectural Diagnostics) has office's in both Seattle and Hawaii.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
14	Tfwb Engineers INC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	7 contacts →
	Exact match “TFWB Engineers formerly Travis, Fitzmaurice & Associates is an electrical, telecommunications, and security design consulting firm.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
15	Integrity Energy Systems	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	7 contacts →
	Exact match “Integrity Energy Systems is a HVAC company based out of Seattle, Washington, in the United States of America.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	Sider Byers Mechanical Electrical Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	11-50	5 contacts →
	Exact match “Sider + Byers is a mechanical and electrical engineering company based out of Seattle, WA.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17	Soltner Group Architects	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1-10	4 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	CES Consulting LLC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1-10	4 contacts →
	Exact match “We are a team of experienced electrical engineers and consultants, who provide strategic planning and advocacy for our clients around the globe.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	VE Services LLC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1-10	3 contacts →
	Exact match “VE provides an innovative and modern solutions to the complex building envelope issues facing architects and business owners.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20	Mechanical Energy Solutions LLC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1-10	2 contacts →
	Exact match “At Mechanical Energy Solutions, we specialize in designing and building energy-efficient HVAC systems that make a difference.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21	FAC Systems INC	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1-10	1 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22	O.G. Engineering, Pllc	Exact match	Seattle, United StatesHQ recorded Oct 9, 2026	1-10	1 contacts →
	Exact match “We are a small, full-service structural engineering firm providing consulting services to architects, designers, developers, contractors and building owners in the Seattle…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	Sweek Consulting Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 9, 2026	1-10	1 contacts →
	Exact match “Sweek Consulting Engineers, LLC is a Seattle-based consulting firm specializing in energy efficiency engineering consulting services within the construction industry.” Recorded in the RevenueBase company graph · Oct 9, 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 “building systems consultants”. 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 23 of 31 building systems consultants based in Seattle, United States

See the full list, filter by size, metro and specialty, and access 494 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Building systems consultants based in Seattle, United States at a glance

As of Oct 9, 2026

57.8%Verified-email coverage

27.5Average contacts per company

11-50Median size (employees)

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 31 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 “building systems consultants” 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 494 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 9, 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.

Building systems consultants 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 “building systems consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many building systems consultants are there based in Seattle, United States?

RevenueBase identified 31 company matches for building systems consultants 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?

Hargis 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 building systems consultants?

New York leads the United States with 193 company records, followed by Houston (130) and Miami (59). Seattle has 31.

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 494 professional contacts with verified work emails tracked across these 31 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 9, 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.