Basement Waterproofing Rules in Pennsylvania: What Philadelphia, PA Homeowners Should Know
Hiring someone to dry out a basement in Philadelphia, Pennsylvania brings together state registration, City licensing, contract terms and, across much of the city, a shared sewer system. This page walks through each piece in everyday words and names the public office that can confirm it. This is a summary of public law, not legal advice.
The Basics
Five points carry most of the weight.
- Registration comes first. Pennsylvania home improvement workers, waterproofers included, register with the Attorney General and print a "PA" number on ads, estimates and contracts.
- The City adds a layer. Inside Philadelphia, L&I licenses contractors or takes a filing of their state registration.
- Plumbing is its own trade. Backwater valves and anything tied into the house drain need a Philadelphia-licensed master plumber and a permit.
- Over $500 goes on paper. Above $5,000, the deposit is generally capped at one-third.
- Floor drain water is a sewer matter. PWD runs a 24/7 hotline and a free backwater-valve program for eligible owners.
The Local License Rule
Pennsylvania has no separate waterproofing license. Instead, the Home Improvement Consumer Protection Act (73 P.S. 517.1 and following) lists waterproofing among the jobs it covers and requires the people doing that work to register with the Attorney General's office. Their number begins with "PA," and it belongs on every advertisement, estimate and contract they hand out.
To look a business up, use the Attorney General's online Home Improvement Contractor search, or dial the HICPA line at 1-888-520-6680. The search lists active registrations only, and a listing is not an endorsement.
Philadelphia stacks its own rules on top. The Department of Licenses and Inspections (L&I) licenses contractors for construction and repair, though a firm working only on existing one- and two-family houses can instead submit its state registration to the City. Either one shows up in the City's "Find a licensed contractor" search; 311 can also confirm it, or (215) 686-8686 from outside the city. The City also licenses master plumbers. Beyond the city line, each township keeps its own contractor registration or license as well.
Under the act, anyone who offers to take on home improvement or agrees to perform it counts as a contractor. Philadelphia PA Basement Waterproofing stays well back from that line: it holds neither a state home improvement contractor registration nor a City of Philadelphia contractor license, and it never does basement work, sets prices or signs contracts. A request sent here goes to one independent local contractor, who visits, writes the estimate and carries out any job you agree to. Contractors may buy advertising on the site, for now as a free trial; you never pay, and nothing of value comes your way.
Paperwork Worth Insisting On
HICPA sets the minimum for any home improvement job priced above $500. The agreement has to be written, legible and signed by you and the contractor, and it must show the registration number, when work starts and finishes, what the job includes, the full price and a notice of your right to cancel. If a piece is missing, ask for a corrected copy before you sign.
When the price tops $5,000, the deposit generally can't exceed one-third of the contract amount, plus any special-order materials. No payment may be asked for or taken before the contract is signed. A waterproofing contract is also easier to hold someone to when it covers these points.
- Where the drain runs. Which walls get the interior drain, and its total length.
- Pump specifics. The model, any battery backup or alarm, and where the discharge ends.
- Permits and plumbing. Who pulls each permit, and which licensed master plumber handles work on the house drain.
- Insurance on paper. Certificates for liability and workers' comp, not a verbal assurance.
- Warranty wording. What it covers, for how long, and whether it passes to a buyer if you sell.
Changing Your Mind After Signing
Under HICPA, you can generally back out of a home improvement contract without penalty within 3 business days of signing, and the contract has to tell you so. A second right comes from the Unfair Trade Practices and Consumer Protection Law: when a sale of $25 or more happens door to door, the buyer can generally cancel within 3 full business days. Both laws punish cheating harder when the person harmed is 60 or older.
Cancel in writing, keep a copy and send it in a way that leaves a delivery record. Unresolved disputes can go to L&I, the township or the Attorney General's Bureau of Consumer Protection, whose HICPA line is 1-888-520-6680.
Backflow Help and Other Programs
According to PWD, combined sewers serve about 60% of Philadelphia, so storm runoff and household wastewater share the same pipes. When a heavy storm overloads them, that mix can rise back up through a basement floor drain. That's a sewer backup rather than seepage, and waterproofing won't stop it. Keeping up the house drain, curb trap and lateral that run to the street sewer is the owner's job.
For eligible owners, PWD's Basement Backup Protection Program puts in a backwater valve at no charge, adjusting downspouts as well if needed. The water bill must be current or on a payment agreement, violations resolved, the lateral sound (PWD's zero-interest HELP loan can cover a broken one) and the plumbing reachable. Contractors hired by the program do the work under a one-year warranty; after that, upkeep falls to the owner. The program line is (215) 685-4901.
With water coming up now, dial (215) 685-6300, the 24/7 PWD Water Emergency Hotline, while it's still on the floor. This site has no part in the program and can't speed anyone through it.
PWD and 311 serve the city only. In Cheltenham, PA, Aqua takes sanitary sewer calls at (877) 987-2782, and Lower Merion, PA takes backup reports on its police non-emergency line, 610-649-1000.
On insurance, many homeowners policies leave sewer backups out unless a separate endorsement was added, and seepage is commonly excluded. Read your policy and take questions to your insurer or agent; this site has nothing to do with insurance.
Permits and Local Rules
In Philadelphia, L&I starts from the idea that work needs a permit unless it is exempt. Every plumbing job needs a permit and a licensed plumber, and backwater valves count as plumbing. A dig-out, which lowers the basement floor, counts as excavation and needs its own permit plus notice to the adjoining neighbor. Drain tile or a sump on its own may or may not need one, so the contractor confirms permits with L&I.
- Upper Darby, PA. Contractors are licensed under township Chapter 265, and a sale triggers a Use & Occupancy inspection. Licenses & Inspections: 610-734-7613.
- Lower Merion, PA. A township contractor license, separate from state registration; plumbers need one too. Building & Planning: 610-645-6200.
- Cheltenham, PA. Contractors register, and permits go through the online portal with the signed contract attached. 215-887-1000.
- Abington, PA. Every contractor working there registers with the township. Code Enforcement: 267-536-1000.
- Bensalem, PA. Contractors are licensed before permits issue; new plumbing fixtures need Bucks County Water & Sewer Authority sign-off. Building & Planning: 215-633-3644.
Legal Questions, Plainly
Is there a Pennsylvania license just for waterproofing?
No. Waterproofing falls under the state's home improvement registration, kept by the Attorney General's office; search it online or dial 1-888-520-6680. Philadelphia and the townships add their own licensing or registration.
How much can a contractor ask for before work starts?
On a job over $5,000, the deposit generally can't go above one-third of the price, plus special-order materials. No payment of any size is allowed before the contract is signed, and anything priced above $500 needs a written contract showing the total and the registration number.
Does PWD's free backwater valve take the place of waterproofing?
No, the two handle different water. A backwater valve helps keep sewer water from rising through the drain in a storm, while waterproofing deals with groundwater coming through walls or the floor joint. Ask PWD about eligibility at (215) 685-4901.
Official Sources
All read 2026-10-10; laws and program terms change, so check the current version.
- HICPA, 73 P.S. 517.1 and following. Registration, contracts, deposits and cancel rights.
- UTPCPL, 73 P.S. 201-7. Door-to-door cancellation.
- attorneygeneral.gov home improvement pages. Registration and the contractor search.
- phila.gov L&I and Basement Backup Protection Program pages. Licenses, permits and the free valve.
- water.phila.gov. Combined sewers, the owner's pipes and the emergency hotline.
Ready for the Next Step?
With the rules in hand, a written price for your own basement is the useful next move. Fill in the brief request form, and one independent contractor working in the Philadelphia area will follow up, look at the walls and lay out scope and cost on paper, with its PA registration number on the estimate. For a rough figure first, try the cost calculator or the wet basement checker.