Company lists · Data refreshed September 2026

Top 18 Construction companies based in Gaithersburg, United States

Name: Construction companies based in Gaithersburg, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 31 companies tracked

RevenueBase lists 31 construction companies based in Gaithersburg, United States, with 388 business contacts and 134 email addresses, as of September 2026. New York is the single most-represented city among the companies on this list. Use the directory to research construction providers and identify relevant business contacts.

Construction companies plan, manage, and carry out building, renovation, civil engineering, infrastructure, and related construction work for commercial, residential, industrial, and public-sector projects. This list covers companies that provide construction, building, renovation, site development, infrastructure, or related project services. Ranked by team size, largest first. Data current as of September 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 6, 2026 86% judged on-target in blind review

31Companies

388Contacts tracked

134Verified emails

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The 18 largest construction companies based in Gaithersburg, United States

Ranked by team size

Top 18 of 31 construction companies based in Gaithersburg, United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to construction companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	HSU Builders	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	51-200	77 contacts →
	“HSU Builders (HSU) is a full-service construction company engaged in government and private sector contracting.” Source: company website · checked Sep 6, 2026
2	Eastern Construction	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	47 contacts →
	“Eastern Construction is a full service general contracting & construction management firm, specializing in interior & exterior renovations on Multi-Family Homes, Commercial…” Source: company website · checked Sep 6, 2026
3	Kane Construction, INC	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	44 contacts →
	“KANE Construction has been Building \| Winners for 25 years.” Source: company website · checked Sep 6, 2026
4	Dd&b Construction, INC	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	38 contacts →
	“DD & B Construction Inc.” Source: company website · checked Sep 6, 2026
5	Henley Construction Co., INC	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	37 contacts →
	“Established in 1964, Henley Construction Company, Inc.” Source: company website · checked Sep 6, 2026
6	Concrete General, INC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	201-500	30 contacts →
	Source: company website · checked Sep 6, 2026
7	Metro Bobcat, INC	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	51-200	23 contacts →
	“Metro Bobcat Sales is a construction company based out of 7002 Marlboro Pike, Forestville, Maryland, United States.” Source: company website · checked Sep 6, 2026
8	Deerfield Construction Group, INC	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	13 contacts →
	“Since 1993, Deerfield Construction Group, Inc, has provided full-service construction project solutions to clients in a diverse range of industries.” Source: company website · checked Sep 6, 2026
9	Nazco Enterprises, INC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	11 contacts →
	Source: company website · checked Sep 6, 2026
10	Milestone Building Services	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	10 contacts →
	“EXCEPTIONAL GENERAL CONSTRUCTION SERVICES AND FACILITY OPERATIONS Blair Enterprises, Inc.” Source: company website · checked Sep 6, 2026
11	SNG Engineering INC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	1-10	6 contacts →
	“SNG Engineering is a full service Civil, Structural evaluations, design, inspections and constryuction management company Location: SNG Engineering, Inc.” Source: company website · checked Sep 6, 2026
12	East Coast Technologies, LLC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	1-10	5 contacts →
	“East Coast Technologies (ECT) is a multi-discipline general contracting and consulting firm specializing in government contracts.” Source: company website · checked Sep 6, 2026
13	Jfw, INC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	1-10	5 contacts →
	Source: company website · checked Sep 6, 2026
14	Triad Construction Services, INC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	4 contacts →
	Source: company website · checked Sep 6, 2026
15	Eichberg Construction INC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	3 contacts →
	Source: company website · checked Sep 6, 2026
16	Bennington Builders, LLC	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	1-10	3 contacts →
	“Welcome to Bennington Builders, your premier building expert serving the greater Montgomery County area.” Source: company website · checked Sep 6, 2026
17	TW Construction	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	11-50	1 contacts →
	“The TW Construction team began its incubation in the 1970s.“I had been in the construction business for a few years, and here is this guy fresh out of college on the construction…” Source: company website · checked Sep 6, 2026
18	Long Design Build	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 6, 2026	1-10	1 contacts →
	“When it comes to design and remodeling, Long Design Build can do it all.” Source: company website · checked Sep 6, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: construction companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names construction companies.
Partial evidence: Its own public description names part of construction companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name construction companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 18 of 31 construction companies based in Gaithersburg, United States

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Construction companies based in Gaithersburg, United States at a glance

As of Sep 6, 2026

34.5%Verified-email coverage

12.5Average contacts per company

11-50Median size (employees)

2754.8%Largest-city concentration · New York

Sep 6, 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 this city, so it is reported there. Company counts and contact totals on this page are exact for Gaithersburg, over 31 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among construction companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Gaithersburg, United States whose own description of what they do matches “construction companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names construction companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among construction companies, and records with no verified work email. Companies headquartered outside Gaithersburg are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 134 across the full list. 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 September 6, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Construction companies by metro in the United States

Frequently asked

How many construction companies are based in Gaithersburg, United States?

The directory contains 31 construction companies based in Gaithersburg, United States.

What do construction companies do?

Construction companies plan, manage, and perform building, renovation, infrastructure, and related construction work for clients across multiple sectors.

How can I find contacts at construction companies?

The directory includes 388 business contacts and 134 email addresses associated with construction companies.

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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 Smart Search, 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.