Company lists · Data refreshed September 2026

Top 25 Architectural conservation firms based in the United States

Name: Architectural conservation firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 4,916 companies tracked

RevenueBase identified 4,916 architectural conservation firms headquartered in the United States as of September 2026 and tracks 43,602 professional contacts across them, including 19,699 with verified work emails. New York is the largest hub.

This list covers architectural conservation firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 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 30, 2026 86% judged on-target in blind review

4,916Companies

43,602Contacts tracked

19,699Verified emails

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The 25 largest architectural conservation firms based in the United States

Ranked by team size

Top 25 of 4,916 architectural conservation firms based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to architectural conservation firms: 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	Little Diversified Architectural Consulting	Partial evidence	Little Global, VA, United StatesHQ checked Sep 30, 2026	201-500	509 contacts →
	Partial evidence “At Little, we deliver results far beyond architecture-results you wouldn’t expect from an architectural firm.” Source: RevenueBase Database · checked Sep 30, 2026
2	Chronicle Heritage	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 30, 2026	501-1,000	423 contacts →
	Indirect evidence “We are a cultural resource management firm operating across the United States and internationally, dedicated to stewarding our shared heritage.” Source: RevenueBase Database · checked Sep 30, 2026
3	Bulley & Andrews	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	201-500	326 contacts →
	Indirect evidence “It’s not just what we build, but why.” Source: RevenueBase Database · checked Sep 30, 2026
4	BSB Design	Indirect evidence	West Des Moines, IA, United StatesHQ checked Sep 30, 2026	51-200	281 contacts →
	Indirect evidence “For 60 years, BSB Design has partnered with clients to shape places that perform.” Source: RevenueBase Database · checked Sep 30, 2026
5	Lionakis	Partial evidence	Sacramento, CA, United StatesHQ checked Sep 30, 2026	201-500	244 contacts →
	Partial evidence “Lionakis was established in 1909 and is a multi-disciplinary firm specializing in architectural, structural engineering, and interior design services.” Source: RevenueBase Database · checked Sep 30, 2026
6	Marx Okubo Associates, INC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 30, 2026	201-500	234 contacts →
	Indirect evidence “YOUR PROPERTY RISKS, SEEN AND SOLVED.” Source: RevenueBase Database · checked Sep 30, 2026
7	Stuart Dean Company	Partial evidence	New York, NY, United StatesHQ checked Sep 30, 2026	201-500	230 contacts →
	Partial evidence “Stuart Dean is an international provider of renowned architectural restoration services, specializing in metal refinishing; stone polishing, cleaning and sealing; wood…” Source: RevenueBase Database · checked Sep 30, 2026
8	Allana Buick & Bers, INC	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 30, 2026	201-500	229 contacts →
	Partial evidence “Allana Buick & Bers, Inc.(ABB) is a leading Architectural Engineering firm specializing in making buildings perform better by making them energy efficient and longer lasting with…” Source: RevenueBase Database · checked Sep 30, 2026
9	Quinn Evans	Indirect evidence	Washington, DC, United StatesHQ checked Sep 30, 2026	51-200	225 contacts →
	Indirect evidence “Creators of vital places.” Source: RevenueBase Database · checked Sep 30, 2026
10	Lamar Johnson Collaborative	Partial evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	201-500	224 contacts →
	Partial evidence “Lamar Johnson Collaborative (LJC) is a full-service, integrated architecture and design firm.” Source: RevenueBase Database · checked Sep 30, 2026
11	CBT Architects	Indirect evidence	Boston, MA, United StatesHQ checked Sep 30, 2026	51-200	221 contacts →
	Indirect evidence “CBT is working nationally and internationally on projects that range from urban district master planning to large-scale mixed-use developments, civic and cultural venues…” Source: RevenueBase Database · checked Sep 30, 2026
12	Dekker	Partial evidence	Albuquerque, NM, United StatesHQ checked Sep 30, 2026	201-500	219 contacts →
	Partial evidence “Dekker is a multidisciplinary architecture firm with offices in Albuquerque, New Mexico; Phoenix, Arizona; and El Paso, Texas.” Source: RevenueBase Database · checked Sep 30, 2026
13	OZ Architecture	Partial evidence	Denver, CO, United StatesHQ checked Sep 30, 2026	51-200	213 contacts →
	Partial evidence “At OZ Architecture, we are committed to the creation of excellence in design.” Source: RevenueBase Database · checked Sep 30, 2026
14	Beyer Blinder Belle	Partial evidence	New York, NY, United StatesHQ checked Sep 30, 2026	51-200	198 contacts →
	Partial evidence “Founded in 1968, Beyer Blinder Belle Architects is an award-winning architecture, planning, and interiors with offices in New York City, Washington DC, Boston, and Miami.” Source: RevenueBase Database · checked Sep 30, 2026
15	Berglund Construction	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	201-500	196 contacts →
	Indirect evidence “Berglund Construction is celebrating 115 years in business.” Source: RevenueBase Database · checked Sep 30, 2026
16	Davis Partnership Architects	Indirect evidence	Denver, CO, United StatesHQ checked Sep 30, 2026	51-200	183 contacts →
	Indirect evidence “Davis Partnership Architects provides innovative design solutions, earning the trust and respect of our clients and peers alike.” Source: RevenueBase Database · checked Sep 30, 2026
17	Sargenti Architects	Partial evidence	Paramus, NJ, United StatesHQ checked Sep 30, 2026	51-200	178 contacts →
	Partial evidence “Sargenti sets standards of distinction through meritorious business practice and exclusivity, providing architecture, engineering, and design that leaves a lasting impression…” Source: RevenueBase Database · checked Sep 30, 2026
18	Lord Aeck Sargent	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 30, 2026	51-200	176 contacts →
	Partial evidence “Lord Aeck Sargent (LAS) is a full-service, award-winning architectural and design firm with more than projects completed.” Source: RevenueBase Database · checked Sep 30, 2026
19	Ennead Architects	Indirect evidence	New York, NY, United StatesHQ checked Sep 30, 2026	51-200	171 contacts →
	Indirect evidence “Ennead, a CannonDesign Company, is an internationally acclaimed 160+ person practice based in New York City with offices in Los Angeles and Shanghai.” Source: RevenueBase Database · checked Sep 30, 2026
20	NEW South Associates, INC	Indirect evidence	Stone Mountain, GA, United StatesHQ checked Sep 30, 2026	51-200	171 contacts →
	Indirect evidence “New South Associates is a women-owned small business providing cultural resource management services, both nationally and internationally.” Source: RevenueBase Database · checked Sep 30, 2026
21	LMN Architects	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	51-200	170 contacts →
	Indirect evidence “About LMN Architects Seattle-based LMN Architects specializes in the planning and design of significant public and private facilities, including convention centers, cultural arts…” Source: RevenueBase Database · checked Sep 30, 2026
22	Zapata Group, INC Zapata	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 30, 2026	51-200	156 contacts →
	Partial evidence “ZAPATA is a full service architecture and engineering (A-E) and program/construction management firm.” Source: RevenueBase Database · checked Sep 30, 2026
23	Sheehan Nagle Hartray Architects, A Woolpert Company	Partial evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	51-200	148 contacts →
	Partial evidence “Sheehan Nagle Hartray Architects is an award-winning firm with offices in Chicago and London offering architectural design, interior design, and pre-design services including site…” Source: RevenueBase Database · checked Sep 30, 2026
24	Evergreene Architectural Arts, INC	Partial evidence	Brooklyn, NY, United StatesHQ checked Sep 30, 2026	201-500	147 contacts →
	Partial evidence “Since 1978 EverGreene Architectural Arts has been providing pre-construction, construction and new design services for some of the world's most memorable buildings.” Source: RevenueBase Database · checked Sep 30, 2026
25	Sfcs Architects	Partial evidence	Roanoke, VA, United StatesHQ checked Sep 30, 2026	51-200	145 contacts →
	Partial evidence “SFCS is a full-service architectural, engineering, planning, and interior design firm serving clients nationwide.” Source: RevenueBase Database · checked Sep 30, 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: architectural conservation firms. 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 architectural conservation firms.
Partial evidence: Its own public description names part of architectural conservation firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name architectural conservation firms. 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 25 of 4,916 architectural conservation firms based in the United States

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Architectural conservation firms based in the United States at a glance

As of Sep 30, 2026

45.2%Verified-email coverage

8.9Average contacts per company

1-10Median size (employees)

7.2%Largest-city concentration · New York

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

3,273

11-50

1,409

51-200

198

201-500

501-1,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 4,916 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 architectural conservation firms, 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 the United States whose own description of what they do matches “architectural conservation firms”. 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 architectural conservation firms), 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 architectural conservation firms, and records with no verified work email. Companies headquartered outside United States 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, 19,699 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 30, 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.

Architectural conservation firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its 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 the category the list is about. Each row is rated strong evidence when the company's own description names architectural conservation firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many architectural conservation firms are there based in the United States?

RevenueBase identified 4,916 architectural conservation firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Little Diversified Architectural Consulting, headquartered in Mclean, tops this list with the largest team on record.

Which city has the most architectural conservation firms?

New York leads with 356 headquartered companies, followed by Los Angeles (101) and Chicago (94).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 19,699 verified decision-maker contacts tracked across these 4,916 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 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 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.