Serving Greater Philadelphia Since 1989

Basement Waterproofing · Foundation Repair · Crawl Spaces

Keep Your Basement Dry, Healthy & Protected

Over 35 years of experience solving water problems for homeowners across the Greater Philadelphia region. Free inspections, honest advice, and solutions that last a lifetime.

Schedule Your Free Inspection

Same-day estimates available · No obligation

What issue are you experiencing?

We respect your privacy. No spam, no high-pressure sales. Ever.

Our Services

Complete Waterproofing & Foundation Solutions

Whatever your situation, we'll figure out what actually makes sense for it — no one-size-fits-all approach.

Foundation Repair

Crack injection, structural repairs, and stone foundation restoration.

Crawl Space Encapsulation

Vapor barriers, drainage, and dehumidification for a clean, dry crawl space.

Exterior Waterproofing

Foundation excavation, exterior drains, grading corrections, and sill plate sealing.

Sump Pumps & Backups

Installation, replacement, battery backup and water-powered backup systems.

Dehumidification

Properly sized dehumidifiers for basements and crawl spaces to control moisture.

Egress Windows

Code-compliant egress window installation for safety and natural light.

Patch & Paint

Clean, seal, and coat basement walls and floors — make your space usable again.

Why Main Line Waterproofing

Not Your Typical Waterproofing Contractor

With 35+ years of experience and thousands of satisfied homeowners, here's why people trust us.

Sump Pumps & Backups

We give you options at different levels and let you make an educated decision. Our job is to advise, not to sell. No high-pressure pitches — ever.

Family-Owned, 35+ Years

Owner Herb Fry III has been doing waterproofing for 25 years. His father did it before him. Whatever you're dealing with, we've seen it.

Lifetime Transferable Warranty

Our French drain systems come with a lifetime warranty that transfers to the next owner when you sell — it stays with the property.

Fast, Clean Work

70% of our jobs are done in a single day. We contain dust with plastic sheeting, broom sweep, and leave everything clean when we're done.

Custom Solutions

We don't come in with a one-size-fits-all approach. We diagnose where the water is actually coming from and build a solution around that.

Fair Pricing & Financing

Solutions for every budget. Just because Main Line is our name doesn't mean you'll pay Main Line prices. Financing available through GreenSky.

Customer Reviews

What Homeowners Are Saying

Don't just take our word for it — hear from real customers across the Greater Philadelphia area.

"Called up Herb not knowing what to expect. He came over in a day, provided a very fair price — 50 percent less than other quotes. The guys completed the job in a day and so far no water has come in. Herb is easy to talk to, relaxed."

Kevin
Kevin
Basement Waterproofing

"Main Line Waterproofing did a great job fixing the water problem in my basement in a reliable and professional manner at a competitive price. I would be happy to recommend them to others."

Christine
Christine
Drain System & Sump Pump

"This company actually did their own work. They did exactly what they said they were going to do. Installing something like this can set you back, so it was nice to get a quality job for a great price."

Carol
Carol
French Drain System, 2 Pumps + Backup

"Responded promptly to my request for an estimate and showed up on time. Explained the work and what to expect. Crew performed the work as promised within the time frame agreed upon."

Elizabeth
Elizabeth
French Drain & Sump Pump

"We had a wonderful experience. The team was professional, knowledgeable, and efficient. Our basement hasn't had a drop of water since the work was done. Highly recommend Main Line Waterproofing!"

Mark
Mark
Complete Waterproofing System

"Herb was honest and straightforward about what we needed and what we didn't. No pressure at all. The crew was in and out in one day and the basement has been dry ever since."

Susan
Susan
Interior Waterproofing

Stop Worrying About Water — Get It Fixed Right

Free inspection, honest advice, and solutions built to last a lifetime.

35+

Years in Business

1000s

Satisfied Homeowners

70%

Jobs Done in 1 Day

A+

BBB Rating

Service Areas

Proudly Serving Greater Philadelphia for 35+ Years

Southeastern Pennsylvania, Northern Delaware, and parts of New Jersey.

  • Havertown

  • Gladwyne

  • Bryn Mawr

  • Villanova

  • West Chester

  • Ardmore

  • Wayne

  • Radnor

  • Media

  • Paoli

  • Narberth

  • Wynnewood

  • Merion Station

  • Drexel Hill

  • Springfield

  • Swarthmore

  • Newtown Square

  • Conshohocken

  • King of Prussia

  • Malvern

  • Devon

  • Berwyn

  • Exton

  • Downingtown

  • Lansdale

  • Norristown

  • Wilmington, DE

  • Cherry Hill, NJ

  • Philadelphia

  • & Surrounding Areas

Frequently Asked Questions

Got Questions? We've Got Answers

Here are the most common things homeowners ask us before getting started.

Do you provide free inspections and estimates?

Yes — and there's no pressure attached. We provide free on-site estimates for homeowners. The estimate typically takes 30 minutes to an hour. We survey the areas of concern, check the outside for drainage issues, and make recommendations — including things you might handle yourself. We send a detailed proposal afterward, usually the same day.

How do I know it's time to waterproof my basement?

If you see water coming up through the floor or walls, moisture spots, dampness, or smell musty odors — it's time to call. Even if you're not sure, it's worth having us take a look. We'll tell you honestly what we see.

What is a French drain and do I need one?

A French drain is a perforated drain line set in gravel along the interior perimeter of your basement. It intercepts groundwater pushing in through walls or floor and channels it to a sump pump. Whether you need one depends on your specific situation — sometimes a simpler fix does the job. But for recurring water or hydrostatic pressure, it's usually the right answer.

How long will my waterproofing project take?

Most residential projects are completed in one to two days — about 70% of our jobs are done in a single day. For larger systems, we bring in a bigger crew so the job still moves quickly. We'll give you a clear timeline before we begin.

How much does basement waterproofing cost?

It depends on the job — size, cause, interior vs. exterior, and repairs needed. Our average job runs in the range of $7,000 to $8,000, but we do smaller targeted repairs and larger projects as well. The best thing to do is have us come out for a free, detailed written estimate with clear pricing.

Do you offer warranties or guarantees?

Yes — crack injection repairs come with a ten-year warranty. Our French drain (pressure relief) systems come with a lifetime transferable warranty that passes to the next owner when you sell. We guarantee all our work — if something has an issue, we come back out, usually within a day or two.

Can I stay home during the work?

Yes, absolutely. The first hour can be loud due to jackhammering, but after that it quiets down. We contain dust with plastic sheeting and try to enter and exit through basement windows. When we're done, we broom sweep and clean up.

Will waterproofing help with mold and musty odors?

Yes. Mold needs moisture to grow, so when you eliminate the water problem, you remove what's feeding it. Waterproofing stops water intrusion, and paired with a dehumidifier, it controls humidity levels. We address the root cause — the moisture — so mold issues improve significantly.

Do you offer financing?

Yes. We work with GreenSky — one of the largest construction financing companies. They offer plans including a no-merchant-fee option. You apply online and are typically approved quickly. We're happy to talk through financing if the investment is a concern.

What areas do you serve?

We serve the Greater Philadelphia region including Southeastern Pennsylvania, Northern Delaware, and parts of New Jersey. Our core area is Havertown and the Main Line — Gladwyne, Bryn Mawr, Villanova, West Chester, and surrounding communities.

We Accept All Major Credit Cards

Financing Available Through

GreenSky FINANCING