Company lists · Data refreshed November 2026

Top 25 Mechanical systems design firms worldwide

RevenueBase identified 21,034 company matches for mechanical systems design firms worldwide as of November 2026 and tracks 296,317 professional contacts across them, including 93,548 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for mechanical systems design firms worldwide, 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 November 6, 2026. Country and city lists for mechanical systems design firms follow the table.

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 Nov 6, 2026 How this list was built
21,034Companies
296,317Contacts tracked
93,548Verified emails
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The 25 largest mechanical systems design firms worldwide

Ranked by team size
Top 25 of 21,034 company matches for mechanical systems design firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchGarden Grove, MD, United StatesHQ recorded Nov 6, 202610001+3,122 contacts →

Exact match

“As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2Exact matchRotterdam, NetherlandsHQ recorded Nov 6, 20261,001-5,0002,672 contacts →

Exact match

“For more than 140 years Croonwolter & dros has been in the vanguard of new developments.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3Exact matchPasadena, CA, United StatesHQ recorded Nov 6, 20265,001-10,0002,633 contacts →

Exact match

“Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4Exact matchNorwalk, CT, United StatesHQ recorded Nov 6, 202610001+1,493 contacts →

Exact match

“A Fortune 500® company and a member of the S&P 500, EMCOR Group, Inc.(NYSE: EME) is a leader in mechanical and electrical construction, industrial and energy infrastructure, and…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5Exact matchSeatac, WA, United StatesHQ recorded Nov 6, 20261,001-5,0001,424 contacts →

Exact match

“MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6Exact matchCork, IrelandHQ recorded Nov 6, 2026501-1,0001,312 contacts →

Exact match

“Dornan Engineering concentrates on a market where quality is appreciated.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Nov 6, 2026501-1,0001,183 contacts →

Exact match

“We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8Exact matchAtlanta, NC, United StatesHQ recorded Nov 6, 20261,001-5,0001,143 contacts →

Exact match

“McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9Exact matchAnkara, TürkiyeHQ recorded Nov 6, 202610001+1,130 contacts →

Exact match

“Mapa Group has emerged as a global leader in the engineering and construction industry, now spanning three continents.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10Exact matchLenexa, TX, United StatesHQ recorded Nov 6, 2026501-1,0001,124 contacts →

Exact match

“Henderson Engineers is a national building systems design firm with a wide array of engineering services and a portfolio representing a full range of markets including business…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11Exact matchMadison, IL, United StatesHQ recorded Nov 6, 20261,001-5,0001,099 contacts →

Exact match

“Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12Exact matchSt. Paul, ID, United StatesHQ recorded Nov 6, 20261,001-5,0001,055 contacts →

Exact match

“Harris is a leading national mechanical contractor specializing in design and engineering, construction, controls, service, manufacturing, conveyors and end-to-end building…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13Exact matchLouisville, TN, United StatesHQ recorded Nov 6, 2026501-1,0001,049 contacts →

Exact match

“CMTA is part of Legence, a Nasdaq Listed company.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14Exact matchJacksonville, FL, United StatesHQ recorded Nov 6, 2026501-1,000941 contacts →

Exact match

“Stellar, headquartered in Jacksonville, Florida, is a fully integrated firm focusing on design, engineering, construction, refrigeration, and mechanical and electrical services…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15Exact matchİstanbul, TürkiyeHQ recorded Nov 6, 20261,001-5,000937 contacts →

Exact match

“Founded by Rıdvan Çelikel in 1986, Anel is a global contracting company with its expertise in MEP systems in large scale and challenging projects.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16Exact matchDubai, United Arab EmiratesHQ recorded Nov 6, 20261,001-5,000896 contacts →

Exact match

“ALEMCO is a Mechanical, Electrical and Plumbing Contractor and a subsidiary of the ALEC Group.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17Exact matchJeddah, Saudi ArabiaHQ recorded Nov 6, 2026501-1,000868 contacts →

Exact match

“Hesco is a design and engineering rm located in the Kingdom of Saudi Arabia with oces in Jeddah, Riyadh, Makkah, Syria, Turkey, Egypt, Spain and Lebanon.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18Exact matchDubai, United Arab EmiratesHQ recorded Nov 6, 20265,001-10,000861 contacts →

Exact match

“Established in 1978, BK Gulf LLC is a leading contractor in electrical, mechanical, instrumentation and building services within the UAE & Middle East market.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19Exact matchPortland, NV, United StatesHQ recorded Nov 6, 2026201-500843 contacts →

Exact match

“PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20Exact matchEstaque, FranceHQ recorded Nov 6, 20261,001-5,000801 contacts →

Exact match

“For over 50 years the Parlym Group has managed to establish itself as a major player in industrial engineering all over the world.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21Exact matchBurlington, ON, CanadaHQ recorded Nov 6, 20261,001-5,000797 contacts →

Exact match

“CIMCO Refrigeration specializes in the engineering, design, manufacture, installation and service of industrial, process cooling and recreational refrigeration systems.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22Exact matchNeptune, NJ, United StatesHQ recorded Nov 6, 2026501-1,000778 contacts →

Exact match

“Founded in 1980, DLB Associates is an MEP and technology consulting firm specializing in data centers and mission‑critical facilities, delivering creative, optimized engineering…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23Exact matchIndiaHQ recorded Nov 6, 2026501-1,000765 contacts →

Exact match

“Conserve Solutions was founded by passionate professionals in 2016 to provide Holistic Engineering Solutions for a sustainable built environment.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24Exact matchToronto, MB, CanadaHQ recorded Nov 6, 2026501-1,000730 contacts →

Exact match

“What does it take to be one of Canada’s most respected integrated engineering firms?”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25Exact matchKennewick, WA, United StatesHQ recorded Nov 6, 20261,001-5,000730 contacts →

Exact match

“Apollo is based in Kennewick, Washington, performing Full Mechanical projects across the United States and around the world.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 25 of 21,034 mechanical systems design firms worldwide

See the full list, filter by size, metro and specialty, and access 93,548 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Mechanical systems design firms worldwide at a glance

As of Nov 6, 2026
31.6%Verified-email coverage
14.1Average contacts per company
11-50Median size (employees)
1.0%Largest-city concentration · Sao Paulo
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
9,839
11-50
7,520
51-200
2,563
201-500
591
501-1,000
163
1,001-5,000
75
5,001-10,000
7
10001+
17

Email recency is reported on each country list linked below.

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.
Coverage
Every country. Country and city lists for mechanical systems design firms are linked below.
What qualifies
Company records worldwide whose business descriptions match “mechanical systems design firms” 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. 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 93,548 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 November 6, 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.

Mechanical systems design firms by location

89 lists · largest first

Every Mechanical systems design firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 “mechanical systems design firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many mechanical systems design firms are there worldwide?

RevenueBase identified 21,034 company matches for mechanical systems design firms worldwide as of November 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?

Southland Industries tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most mechanical systems design firms?

The United States leads with 4,007 companies, followed by Italy (1,497) and the United Kingdom (1,360). Every mechanical systems design firms list by country and city is linked on this page.

Which city has the most mechanical systems design firms?

Sao Paulo leads with 218 company records, followed by Istanbul (164) and London (151).

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 93,548 professional contacts with verified work emails tracked across these 21,034 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 November 6, 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.