5 Best Waterproofing Companies in Philadelphia (2026)

What people praise

• Reviewers describe French drain, vapor barrier and sump pump installs done by large crews in a weekend
• One reviewer had a full sump system set up and running in a single day
• Estimators get credit for no-pressure quotes and quick replies to follow-up questions
• Crawl space encapsulation and sump pump work come up in reviews

Worth knowing

• One reviewer said its quote was higher than others but included thicker, better-built materials
• One reviewer who had underground downspout drains re-routed said some things on day one did not match the quote, and that the manager fixed it the next day

What people praise

• One reviewer said a new sump pump ended water in the basement
• Project managers walk homeowners through the plan and the options before work starts
• Crews cover or wrap off work areas to keep dust out of the house
• A reviewer who had a French drain, sump pump and dehumidifier installed said a staff member, Dan, still answered a stormy-night text years later

Worth knowing

• Its reviews describe full-system installs, so ask whether it takes smaller jobs

What people praise

• Reviewers describe French drain and sump pump installs finished in about two days
• Estimators explain the problem in plain terms and give a clear quote
• One reviewer said the crew worked around an existing finished basement
• A reviewer was helped to set up partial financing

Worth knowing

• Smaller review base than the top two names on the page

What people praise

• A reviewer who bought a duplex with cracking foundation walls said the owner explained why they were cracking and finished the repair in three days
• A reviewer had a French drain replaced over two days after collecting several quotes
• Staff are described as responsive and patient with questions
• Its carpentry team restores finished basements after the work

Worth knowing

• Based across the river in New Jersey, so confirm it covers your Philadelphia address
• One reviewer said it was not the cheapest of the quotes they collected

What people praise

• One reviewer had a sump pit moved to meet code and the pump updated
• A reviewer said the crew traced a leak to a neighbor's side of the wall, then reopened, cleaned and resealed it
• A homeowner who had a French drain installed said the crew was respectful and left everything clean
• A real estate professional described its pricing as honest with no upselling

Worth knowing

• Based in Norristown, so Philadelphia addresses are a drive for the crew