Company lists · Data refreshed September 2026
Top 25 Basement finishing companies worldwide
RevenueBase identified 1,282 basement finishing companies worldwide as of September 2026 and tracks 9,283 professional contacts across them, including 962 with verified work emails. The United States is the largest market and Toronto the largest hub.
This list covers basement finishing companies worldwide, 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 19, 2026. Country and city lists for basement finishing companies follow the table.
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.
The 25 largest basement finishing companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 128 contacts → | ||||
Partial evidence “Basement Systems Inc, based in Seymour, Connecticut, is a network of basement waterproofing and crawl space repair contractors spanning across the United States and Canada.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 113 contacts → | ||||
Indirect evidence “Olshan Foundation Solutions is the premier provider of foundation repair, waterproofing and related services in the markets it serves across the United States.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 105 contacts → | ||||
Indirect evidence “Helitech is a locally-owned specialty contractor serving Arkansas, Illinois, Indiana, Iowa, Kansas, Kentucky, Missouri, Oklahoma, and Tennessee with a focus on faith and family.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 96 contacts → | ||||
Partial evidence “For over 45 years, Perma-Seal has been the trusted name in basement waterproofing, foundation repair, concrete leveling, plumbing, and attic insulation throughout Chicagoland and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 92 contacts → | ||||
Partial evidence “Since 2012, DBS has proudly served Minnesota and Wisconsin with expert solutions for basements, foundations, concrete, insulation, and whole-home energy performance.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 89 contacts → | ||||
Partial evidence “Ayers Basement Systems is a family-owned, veteran-owned, and locally operated basement waterproofing and foundation repair contractor serving Michigan and Northern Indiana since…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 88 contacts → | ||||
Strong evidence “Matrix Basements is ranked #1 in America for basement finishing.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 79 contacts → | ||||
Partial evidence “In 1986, Rick and Anna Lee Woods, with a partner, started a waterproofing company called Basement DeWatering Systems Metro-East, Inc.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 78 contacts → | ||||
Indirect evidence “Ohio State Waterproofing has provided quality service with over successful waterproofing and foundation repair installations and satisfied customers since our inception in 1978.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 76 contacts → | ||||
Partial evidence “Groundworks, formerly Ohio Basement Authority, was founded on a mission to protect, repair, and improve our customers’ greatest asset, their home.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 72 contacts → | ||||
Indirect evidence “Aquaguard waterproofing has serviced the region for more than 25 years.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 63 contacts → | ||||
Indirect evidence “The Premier Home Remodeling Design/Build Contractor in West Lafayette, Indiana that is designing home remodels for life.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 62 contacts → | ||||
Indirect evidence “This isn't just a job.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 51 contacts → | ||||
Partial evidence “When it comes to water in your basement or a faulty foundation, you need an expert to ensure the damage is reversed and prevented from occurring in the future.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 51 contacts → | ||||
Partial evidence “Since 2003, whether it is a small home repair, a basement remodel, new home or a commercial drywall project, our MDP team has diverse skill-sets that can bring almost any idea to…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 47 contacts → | ||||
Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 45 contacts → | ||||
Partial evidence “Geopancar Sdn Bhd is a contractor specialising in foundation and basement construction.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 45 contacts → | ||||
Partial evidence “Everdry Wisconsin Everdry is the nation's leader in basement waterproofing with over satisfied customers!” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 40 contacts → | ||||
Partial evidence “Sure-Dry, LLC is an award-winning company that redefines the industry in basement waterproofing, foundation repair, crawl space repair, and concrete leveling and lifting.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 39 contacts → | ||||
Indirect evidence “At Jackman Ltd, we've built our business on creating people's visions.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 33 contacts → | ||||
Indirect evidence “Retail lumber sales” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 24 contacts → | ||||
Partial evidence “Adirondack Basement Systems has been a regional leader in the basement repair industry for 20 years and counting.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 24 contacts → | ||||
Indirect evidence “Since 1972, Kitchen Masters has been the leading Kitchen Remodeling Contractor in the Denver metro area.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 21 contacts → | ||||
Partial evidence “Green Basements and Remodeling is an all-inclusive remodeling company.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 21 contacts → | ||||
Indirect evidence “Cransten is the best experience for Remodeling and Handyman projects.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
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: basement finishing 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 basement finishing companies.
- Partial evidence
- Its own public description names part of basement finishing companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name basement finishing 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 25 of 1,282 basement finishing companies worldwide
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Basement finishing companies worldwide at a glance
As of Sep 19, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 basement finishing 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.
- Coverage
- Every country. Country and city lists for basement finishing companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “basement finishing 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 basement finishing 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 basement finishing companies, and records with no verified work email.
- 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, 962 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 19, 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.
Basement finishing companies by location
2 lists · largest firstEvery Basement finishing companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 basement finishing companies, 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 basement finishing companies are there worldwide?
RevenueBase identified 1,282 basement finishing companies worldwide 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?
Basement Systems, INC, headquartered in Seymour, tops this list with the largest team on record.
Which country has the most basement finishing companies?
The United States leads with 843 companies, followed by Canada (181). Every basement finishing companies list by country and city is linked on this page.
Which city has the most basement finishing companies?
Toronto leads with 20 headquartered companies, followed by Calgary (19) and London (15).
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 962 verified decision-maker contacts tracked across these 1,282 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 19, 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.