Two companies can look at the same basement and come back thousands of dollars apart. Usually they aren’t quoting the same job. Interior drainage is priced by the linear foot of foundation wall, not by the square footage of your floor, and the total moves depending on whether a sump pump, battery backup, dehumidifier and transferable warranty sit inside the price or get added later.
You might be holding two or three quotes that differ by a wide margin. We see it on almost every project we quote in Northeast PA. Below we break down exactly what separates a low quote from a high one, so you can tell which one actually matches your basement.
Key takeaways
- Interior drainage systems are priced by the linear foot of the wall’s foundation, not by the basement’s square footage.
- The total price is determined by the scope of the project and whether it includes things like battery backup, sump pump, dehumidifier and other factors.
- There is a difference between the price and scope of work to address surface seepage and water pushed through hydrostatic pressure.
- Some basement moisture problems can be solved at low cost using regrading and longer downspouts.
- Waterproofing is often not covered under most homeowner’s insurance policies.
What basement waterproofing actually costs
The national cost guides don’t agree with each other, which tells you something before you read a single quote. Angi puts most basement waterproofing between $2,461 and $8,202, averaging $5,241. This Old House puts a 1,000-square-foot basement closer to $13,640. Both numbers are real. They describe different work, and that gap is the same one you’re seeing between your own quotes.
Where your project ends up inside those ranges depends on how much of your basement’s footage needs to be treated, as well as what gets included.
Most basement waterproofing companies will price an interior drainage system based on the linear foundation footage instead of the total square footage of the basement floor. This is the biggest reason why two basements that are the same size can require vastly different pricing to fix drainage problems.
A basement with water drainage along one wall costs much less than one that’s experiencing water seepage on three walls, even if the two structures have an identical floor plan.
A project on the lower end of the basement waterproofing cost spectrum might only involve foundation crack injection along one wall, or installing a short section of interior drain with basic discharge. More complex jobs that result in higher quotes might involve extensive work such as a full-perimeter drainage system with a sump pump, crawl space encapsulation and battery backup.
Financing options are available for full-scope projects that are higher than the homeowner expects.
These prices are based on state-level data. Costs in the Stroudsburg area often run closer to those found in Scranton or Allentown, however, each specific project is different and a customized plan to address problems is always the best approach.
Why the same basement gets very different quotes
The difference in pricing is determined by six main factors. This includes how the water is getting into the basement, how much wall footage is treated, whether the fix is interior or exterior, how difficult it is to access the space, other services that are bundled into the project, and what the home’s warranty actually covers.
Two homeowners with the exact same floor plan can end up with quotes that land far apart in pricing if their problems are totally different.
How the water is getting in
Water that’s running along the surface of a foundation after heavy rains is typically a much cheaper fix than water that’s being pushed through a wall or footer by hydrostatic pressure underground. Water that’s being driven-in by pressure will require a drainage system rather than a sealant. A footer drain is often the best approach for diverting water away from the foundation and preventing seepage before it starts. Window wells are another common entry point worth checking, especially on older homes where the egress window wasn’t sealed properly when it was installed.
Linear feet of wall, not square feet of floor
At $60 to $120 a linear foot, the number that decides your total is how many feet of wall get treated. Ask every contractor for that figure before you compare totals. Two prices without it aren’t comparable, whatever they say at the bottom.
Interior drainage versus exterior excavation
Interior drainage systems are installed from the inside of the basement and cost less than a project that requires outside digging. Exterior digging exposes the foundation wall from outside and must be approached with greater caution, which results in higher costs. Most exterior fixes involve a French drain, which is a gravel-filled trench with perforated pipe that collects water at the foundation and redirects it away from the house before it reaches the wall.
What’s bundled
A quote that includes a sump pump, battery backup, discharge routing, dehumidifier, and a thicker vapor barrier will run higher than one that doesn’t include those items. Homeowners should always ask about these other items before settling on a price.
Concrete and access
Projects that involve breaking and repouring a slab, or getting equipment into small crawlspaces for extensive repairs will add a considerable amount of labor, in addition to the basement waterproofing cost for full encapsulation.
Warranty terms
There are major differences between a five-year warranty and a lifetime transferable warranty. It’s crucial to ask whether your basement’s warranty transfers to new owners of the house.
We see this type of scenario in many basement waterproofing projects across Northeast PA. One contractor might give a quote or “rough estimate” over the phone. Another contractor will actually walk the perimeter, measure linear footage, identify where water is coming in, and then provide an accurate, extremely detailed proposal of everything the project will include.
According to Joseph W. Lstiburek, Ph.D., P.Eng., ASHRAE Fellow, principal at Building Science Corporation, a proper drainage system should incorporate a combination of interior drainage, sump pump and battery backup system to ensure that excess water is removed and not allowed to settle.
“The key to interior drainage is to direct the water “to somewhere”. The only real choice is a sump pit with a pump. The pump should have a battery back-up and it should have an airtight lid. The battery back-up is obvious. Power goes out when it is raining hard and you need the drainage the most. The airtight lid is not so obvious. If the lid on the sump pit is not airtight soil gases such as radon, pesticides, termiticides, and herbicides enter.”
Want a quote that shows its work? We put linear footage, water source, and warranty terms in writing before you decide.
When a cheap quote is the right answer
Not every basement needs a full water drainage system. If water is showing up only after heavy rains and staying near one corner or wall, a solution is sometimes as simple as redirection where water flows near your foundation.
Some “wet basement” calls we get can be fixed with cost-effective measures like regrading the soil around a house for better water drainage, extending downspouts a few feet, or clearing clogged gutters. A full interior drainage system isn’t warranted when the water source is clearly coming from the surface and the foundation itself is sound. If a contractor attempts to sell a full system without ruling out the exact source of the problem, it’s worth getting a second opinion.
Not sure whether you need a full system? A free inspection will tell you either way.
Five things to check on any quote before you sign
A written quote should outline exactly what you’re paying for, with each line item explained. Before you sign anything, check these five items against your quote.
- Linear footage stated. A price without linear footage specified can’t be compared to another quote.
- Where the water goes once it’s pumped. The discharge line should have a clear destination, not just “away from the house.”
- Dehumidifier included or extra. This is one of the most common items left off a low quote and added later.
- Warranty length and transferability. Get both of these in writing, especially if you’re selling the house.
- Crew employed by the company or subcontracted. Know who you’ll contact if anything goes wrong.
We include all five of these on every quote provided to our customers, along with linear footage and the water source, so there’s no guesswork involved.
Does homeowners insurance cover it?
Usually not. Basement waterproofing is preventative work, which isn’t covered in most standard homeowners policies. Whether your specific situation is covered depends on your policy and how the water is getting in.
FAQ
1. What is the average cost to waterproof a basement in Pennsylvania?
It depends which guide you read, and that’s the point. Angi puts most basement waterproofing between $2,461 and $8,202, averaging $5,241. This Old House puts a 1,000-square-foot basement nearer $13,640. What decides where you land is the linear footage of wall treated and whether a sump pump, battery backup and dehumidifier are in the price.
2. How much does it cost to waterproof a 1,000 square foot basement?
Square footage of floor isn’t what the work is priced on. Interior drainage runs about $60 to $120 per linear foot of foundation wall, so a 1,000-square-foot basement needing drainage on one wall costs far less than the same basement needing it on three. Ask for the linear footage before comparing any two quotes.
3. What is the cheapest way to waterproof a basement?
Once the water source is identified as surface water, regrading the foundation and extending downspouts can solve the problem for a few hundred dollars. A full drainage system will cost more, but is always the best approach when water is entering through a wall or footer.
4. How much does crawl space encapsulation cost?
According to This Old House, crawl space encapsulation cost usually runs somewhere between $1,500 to $15,000 with a national average around $5,500. The overall price will depend on square footage, access, and whether a dehumidifier is included.
5. Will insurance pay for basement waterproofing?
In most cases, no. Standard homeowners policies usually exclude water that enters gradually through seepage. Many policies consider such problems to be maintenance issues instead of a sudden loss.
Related Guides
- Does homeowners insurance cover basement water damage?
- Basement waterproofing services
- Crawl space encapsulation
- Flexible Financing
Get a free basement or crawl space inspection in Monroe County and across Northeast PA.
