Researched rankings in 38 cities across the United States and Canada, each with a last-reviewed date.

TenBestFindThe best, verified
Add Your Business

Waterproofing · Denver, COLast reviewed October 2026

5 Best Waterproofing Companies in Denver, CO (2026)

TenBestFind ranks 5 waterproofing contractors in Denver, CO, listed in Google's order among the companies that passed our checks. Each company was checked against the criteria set out under How we chose. Lists name up to ten companies, and this one stops at 5 because only 5 met them. The list was last reviewed on October 21, 2026.

Groundworks Foundation Repair Denver, HomeStrong and Thrasher Foundation & Concrete Repair lead our short list of five Denver companies for basement, crawl space and foundation water problems, each rated 4.5 or higher on Google with at least 50 reviews. Denver has few dedicated waterproofing contractors, so the last two entries are specialists in crack repair and foundation work, and we say so on their profiles.

5 companies reviewed5 rankedHow We Rank

The Ranking

Our top 5 waterproofing contractors in Denver

Denver does not flood like a river town, but its soil and its weather still put water in basements. Expansive clay swells when snowmelt and summer storms soak the ground, window wells fill and overflow, and older brick homes in neighborhoods like Park Hill, Highland and Wash Park have foundations that move and crack. That mix produces damp basement walls, leaking cracks and failing sump pumps more than classic flooding. It also means the market has fewer pure waterproofers than you would find in Chicago or Detroit, so this is a short list on purpose. Five companies cleared our checks, and two of them are foundation or crack repair specialists that we included because they were the closest qualified options, with their limits stated plainly. Colorado does not issue a statewide licence for waterproofing contractors. The City and County of Denver licenses contractors and requires permits for structural work, and plumbing is licensed by the Colorado State Plumbing Board. Check the contractor with Denver Community Planning and Development, ask for proof of insurance, read the Better Business Bureau record, and get the warranty terms in writing, including whether the warranty transfers when you sell.

Showing 5 of 5
  1. 01

    Best for wet basements or crawl spaces that come with sinking slabs

    Groundworks Foundation Repair Denver

    4.7(2692 Google reviews)
    Best forWet basements or crawl spaces that come with sinking slabs or settling
    In businessNot listed
    WarrantyNot listed
    EmergencyNot listed

    Why we picked them

    4.7 from 2,673 Google reviews, with a staffed Ivy St branch and a full basement, crawl space and foundation service line.

    What we like

    • Very large review base, 2,673 reviews at 4.7
    • Long hours, 5am to 9pm on weekdays
    • Free inspection and estimate, appointments from the next day

    Things to consider

    • Reviews lean toward concrete lifting more than basement waterproofing, and no licence or warranty terms are stated.
    Key details
    Best for
    Wet basements or crawl spaces that come with sinking slabs or settling
    Service area
    Denver
    Address
    4686 Ivy St, Denver, CO
  2. 02

    Best for basement and crawl space water problems that may also need concrete or structural work

    HomeStrong

    5.0(406 Google reviews)
    Best forBasement and crawl space water problems that may also need concrete or structural work
    In businessNot listed
    WarrantyTopDrain interior drain system carries a lifetime transferable warranty against water intrusion, per the company website. Ask for written terms for the exact system quoted.
    EmergencyNot listed

    Why we picked them

    5.0 from 407 Google reviews, with a TopDrain lifetime transferable warranty and in-house concrete crews, at a staffed York St office in Denver.

    What we like

    • Reviews name crew leads and foremen, with daily updates
    • Concrete work kept in-house, per the company
    • TopDrain lifetime transferable warranty and battery backup Wi-Fi sump pumps

    Things to consider

    • Reviews lean toward crawl space, concrete and structural jobs, not plain wet-basement repairs.
    Key details
    Best for
    Basement and crawl space water problems that may also need concrete or structural work
    Service area
    Denver
    Address
    4780 York St
    Warranty
    TopDrain interior drain system carries a lifetime transferable warranty against water intrusion, per the company website. Ask for written terms for the exact system quoted.
    Financing
    Available
    Credentials
    BBB accredited business (certificate shown on website)
  3. 03

    Best for foundation, concrete and basement moisture problems together

    Thrasher Foundation & Concrete Repair

    4.8(937 Google reviews)
    Best forHomes with foundation, concrete and basement moisture problems together
    In business51 years
    WarrantyThe company describes its warranties and guarantees as fully transferable and gives customers a copy of the warranty. One reviewer reports a five year warranty on concrete work. Ask for the exact term and coverage for your job in writing.
    EmergencyNot listed

    Why we picked them

    4.8 from 926 Google reviews, with a foundation, concrete and drainage range under one family-owned company that says it began in 1975.

    What we like

    • Foundation, crawl space, concrete and drainage work from one crew
    • Free inspection, same-day estimate and GreenSky financing
    • Family owned since 1975, company claim

    Things to consider

    • Most recent reviews describe concrete jobs, so confirm basement waterproofing experience for your own problem.
    Key details
    Best for
    Homes with foundation, concrete and basement moisture problems together
    Service area
    Denver
    Address
    9652 Hanover Ct W, Henderson, CO
    Years in business
    51 years
    Warranty
    The company describes its warranties and guarantees as fully transferable and gives customers a copy of the warranty. One reviewer reports a five year warranty on concrete work. Ask for the exact term and coverage for your job in writing.
    Financing
    Available
    Credentials
    Better Business Bureau profile (seal displayed on company site)
  4. 04

    Best for a single leaking foundation or basement wall crack

    Colorado Crack Attack

    4.7(86 Google reviews)
    Best forA single leaking foundation or basement wall crack
    In businessNot listed
    WarrantyNot listed
    EmergencyNot listed

    Why we picked them

    Rated 4.7 from 86 Google reviews, it specializes in DE NEEF injection for leaking foundation cracks and is the closest qualified Denver-area crack specialist.

    What we like

    • Injects DE NEEF polyurea grout into actively leaking cracks
    • Same-day repairs reported, one six foot crack done in an hour
    • Free evaluations and a reply promised within 24 hours

    Things to consider

    • Crack-repair specialist only, with no drain tile, sump pump, exterior membrane or crawl space work.
    Key details
    Best for
    A single leaking foundation or basement wall crack
    Service area
    Denver
    Address
    3195 S Zuni St, Englewood
  5. 05

    Best for foundation settlement, sunken slabs and wet basements

    Ram Jack of Colorado Inc

    4.8(161 Google reviews)
    Best forFoundation settlement, sunken slabs and wet basements
    In business44 years
    WarrantyLimited lifetime warranty advertised for foundation repair. Ask for the written terms and what they cover for water.
    EmergencyNot listed

    Why we picked them

    4.8 from 160 Google reviews, a family firm since 1982 with Ram Jack Colorado acquired in 2012, and one of very few established Denver-area options.

    What we like

    • Family firm operating since 1982
    • 4.8 from 160 Google reviews
    • Free evaluation, financing and a limited lifetime warranty

    Things to consider

    • Waterproofing is secondary to foundation and concrete work, and a 2 star review reports a partial slab-lift failure.
    Key details
    Best for
    Foundation settlement, sunken slabs and wet basements
    Service area
    Denver
    Address
    14020 E Davies Ave, Centennial, CO
    Years in business
    44 years
    Warranty
    Limited lifetime warranty advertised for foundation repair. Ask for the written terms and what they cover for water.
    Financing
    Available
    Credentials
    Bonded, licensed and fully insured (stated on company website)

Side by Side

Compare the top waterproofing contractors in Denver

Ranking position reflects our editorial review, not customer ratings.

Editorial comparison of the 5 ranked companies. Customer ratings, where shown, come from the source named on each company profile.
RankCompanyBest forKey servicesService areaGoogle ratingEmergencyProfile
01Groundworks Foundation Repair DenverWet basements or crawl spaces that come with sinking slabs or settlingDenver4.7(2692)Not listedView
02HomeStrongBasement and crawl space water problems that may also need concrete or structural workDenver5.0(406)Not listedView
03Thrasher Foundation & Concrete RepairHomes with foundation, concrete and basement moisture problems togetherDenver4.8(937)Not listedView
04Colorado Crack AttackA single leaking foundation or basement wall crackDenver4.7(86)Not listedView
05Ram Jack of Colorado IncFoundation settlement, sunken slabs and wet basementsDenver4.8(161)Not listedView

Coverage

Waterproofing companies serving Denver and nearby areas

Most companies in this ranking work across Colorado and the surrounding suburbs. Coverage and travel fees vary, so confirm your address is inside the service area before scheduling.

  • Denver

Service coverage across Denver. Individual company areas are listed on each profile.

Methodology

How we chose the best waterproofing contractors in Denver

We searched Google Maps for waterproofing, basement, foundation, crawl space, drainage and sump pump companies in Denver and kept those that were operational, rated 4.5 or higher with at least 50 Google reviews, had a working company website and a staffed street address, and sold some form of basement or foundation water control. The list follows Google's order across those searches. We rejected plumbers, restoration firms, basement finishers, concrete leveling companies, mailbox addresses and firms with no street address. Because Denver has few dedicated waterproofers, we included two specialists as the closest qualified options. Ratings and review counts were read on October 21, 2026. No company paid for a place on this list.

Read our full ranking methodology
Evaluated5
Ranked5

Hiring

How to choose a waterproofing contractor in Denver

  1. Verify insurance and credentials

    Ask for a current certificate of insurance and confirm registration or licensing with the authority that issues it, not with the company.

  2. Ask for a written estimate

    Scope, materials, removal, disposal and who pulls the permit should all be named on the page rather than agreed on the doorstep.

  3. Compare multiple quotes

    Two or three bids on the same scope. A number far below the others usually means something has been left out of it.

  4. Understand the warranty

    Separate the manufacturer's warranty on materials from the company's own warranty on the work, and get both in writing.

  5. Ask who performs the work

    Find out whether the crew are employees or subcontractors, and who supervises them on the day.

  6. Check recent local projects

    Ask for addresses or photographs of comparable jobs finished nearby in the last year or two.

  7. Avoid high-pressure sales

    A discount that expires today, or a knock on the door after a storm, is a reason to slow down rather than sign.

  8. Get everything in writing

    Change orders, timeline and payment schedule included, before the first payment changes hands.

Questions to ask before hiring

0 of 10 asked

Red flags

  • No verifiable local business address or registration
  • Pressure to sign on the first visit
  • A demand for full payment up front
  • An offer to cover or waive your insurance deductible
  • Refusal to put warranty terms in writing
  • A quote that will not itemize scope

Keep Going

Related home services in Denver

FAQ

Waterproofing companies in Denver FAQs

Do waterproofing contractors need a licence in Denver, Colorado?

Colorado has no statewide licence for waterproofing contractors. The City and County of Denver licenses contractors and requires permits for structural work, and plumbing is licensed by the Colorado State Plumbing Board. Check the contractor with Denver Community Planning and Development, ask for proof of insurance, and read the Better Business Bureau record before you sign.

How much does basement waterproofing cost in Denver?

It depends on the problem. Sealing one leaking crack costs far less than interior drain tile and a sump pump, and exterior excavation costs the most. Get at least two written quotes, ask what each includes, and compare warranty terms, including whether the warranty transfers when you sell the house.

Why does clay soil cause wet basements and cracks in Denver?

Denver sits on expansive clay that swells when it soaks up snowmelt and summer rain and shrinks as it dries. That movement pushes on foundation walls, opens cracks and lets water in, and poor grading or full window wells make it worse. Fixing drainage around the house and the grade away from the walls is often part of the repair.

Editorial Record

About this ranking

Originally published
October 2026
Last reviewed
October 2026
Companies evaluated
5

Need a waterproofing contractor in Denver?

Or compare the Denver waterproofing contractors again