Exterior and below-grade waterproofing deals with water before it ever reaches your basement walls. Instead of managing leaks from the inside, crews excavate down to the footing, apply a membrane or coating to the foundation wall, install or replace drain tile (footing drains), and fit a dimpled drainage board to channel groundwater to a sump pit or daylight discharge. Grading and downspout extensions often get corrected at the same time, since poor lot slope is a leading cause of wet basements around Janesville's clay-heavy soil.
Because this work involves heavy excavation next to your foundation, the contractor matters as much as the method. Look for a written scope that specifies membrane type and drain tile material, a soil and grading assessment (not just a sales pitch for a coating), a transferable warranty with clear terms, and proof of insurance for work near a structure. Ask how they handle egress windows, utility lines, and landscaping restoration, and get more than one bid before committing to a full exterior dig.
Our scoring weighs verified licensing and insurance, warranty length and what it actually covers, response time to inquiries, and a track record of jobs completed without callbacks. See how each of the 8 local contractors stacks up in our ranked guide to Janesville waterproofing contractors, and read our methodology for how we score and verify every business listed here.
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8 businesses, scored on recent reviews. The order weighs each business's overall score by how much of its reviewed work is exterior & below-grade waterproofing, so a lower-scored specialist can rank above a higher-scored generalist.
Water in the basement from poor grading is their most common fix, often resolved in days with follow-up landscaping that looks polished. Reviewers consistently note the team and the crew's speed, attentiveness to detail, and willingness to stand behind the work with no complaints recorded.
Flood Pros handles water damage and basement restoration with speed and care. Reviewers consistently praise the team's responsiveness (often within an hour), professional crew behaviour, and thorough cleanup. Staff explain the work clearly and follow up after jobs. One mold remediation job fell short when protective plastic wasn't used as promised, leaving the customer to arrange professional cleaning afterward.
Reviewers consistently experience attentive, knowledgeable staff who coordinate insurance and complete jobs on schedule with thorough cleanup. Work spans storm damage (roof and siding after hail), gutters, windows, and patio doors; crews handle small projects with the same care as major replacements. The team's hallmark is detailed communication and willingness to address minor issues after completion without hesitation. Owners the team are named for personal follow-up, transparency on pricing, and commitment to the community (including free tarping during past tornado damage).
From initial quote through final cleanup, Wilco's team delivers consistent attention to detail and reliability. Window replacements, roof work, and inspections all earn praise for workmanship, punctuality, and staff who treat projects as priorities. Installation crews arrive on schedule, explain options without pressure, and finish with clean worksites. A single missed estimate appointment stands out sharply against 16 five-star reviews from satisfied customers.
Every review is five stars. Customers consistently praise the team's responsiveness, clear pricing, and willingness to complete extra work without charging extra. They return for repeat jobs and recommend the company to others. The business tackles complex spray foam insulation alongside roofing: attics, basements, crawl spaces, and cathedral ceilings, often discovering and fixing previous installation mistakes during the process.
Find exterior & below-grade waterproofing in janesville for your project
No obligation. Describe your waterproofing job and we'll connect you with providers who fit what you need.
Nearly all reviewers praised Advanced Construction's speed, professionalism, and follow-through on projects ranging from egress windows to full home remodels. One customer's egress window held perfectly during regional flooding weeks after install. The team earned trust for honoring warranty work on older jobs without argument, keeping job sites clean, and communicating clearly with insurance adjusters. Two isolated one-star reviews mentioned missed appointments and rudeness, but represent outliers in a strong track record.
Water damage and fire cleanup draw consistent praise for prompt arrival and respectful crew behavior; staff follow up for days after initial work. Rebuilding work has shown inconsistency, with some projects completed professionally while others faced shortcut attempts and quality lapses.
Review evidence is limited. The business is based in Janesville and their website lists basement and exterior waterproofing services including sump pump installation, French drains, crack repair, and crawl space encapsulation. They state they are certified basement waterproofing contractors.
Last updated 2026-09-07