What’s the best way to handle wet basement repair?

The best way to handle wet basement repair is to stop the water from the inside, with full-perimeter interior drainage tied to a sump pump, plus a 12-mil wall vapor barrier and a dehumidifier. That is our Forever Dry System, and a full basement runs $3,000 to $30,000. It catches the water at the source and keeps the room dry for life.

Here is what is going on under your house. When your home was built, the crew dug a hole, set the foundation, then pushed the dirt back in. That backfill is looser than the packed ground around it. It drains slow. It holds water. So rain and snowmelt collect right against your wall, and the water finds the weakest spot to get in.

That weak spot is usually the floor wall joint. It is the seam where your wall meets the slab. Water also pushes through cracks, and up through the floor when the ground gets saturated. Up here in New Hampshire, frost heave makes it worse. Frozen soil swells and presses the walls inward, which opens new gaps every winter.

So you have water coming in. The question is where you stop it.

We stop it on the inside. We cut a channel around the perimeter, lay drainage that catches water at the floor wall joint, and route it all to a sump pump that throws it back outside. We add a 12-mil vapor barrier on the walls and a dehumidifier to handle the damp air. That is the whole system, and it is 100% guaranteed to be dry for life!

A lot of folks ask about digging up the outside instead. We do not do exterior excavation waterproofing. In our experience it fails in about two to three years. You dig a trench, seal the wall, backfill it, and that fresh fill drains slow all over again. The interior fix lasts. That is where we put our work.

What drives the price is the size of the basement and how much perimeter we have to trench. The sump sizing follows the job, one half horsepower per 120 feet of drain. We also put a battery backup on the sump, because the storms that flood basements are the same storms that knock the power out. A charged backup battery keeps the pump running through an outage, before it runs down.

Now the part where we level with you. You may not need the full system. If you have one crack leaking in one spot, that is a crack injection, and it runs $1,000 to $3,000. We can seal that and leave the rest of your basement alone. We will tell you that when we see it. You do not pay for a perimeter system to fix a single crack.

And if the water is in a dirt-floor crawl space instead of a finished basement, that is a different fix. That is crawl space encapsulation, not Forever Dry, and it runs $3,000 to $25,000. The U.S. Department of Energy notes that up to about a third of a home’s heat loss can come from an uninsulated foundation or crawl, so sealing it pays you back in comfort too. See DOE Building America.

The water itself matters more than people think. Standing water and damp air rot wood, rust steel, and grow mold. Most standard policies do not cover gradual seepage, so the repair sits on you. The Insurance Information Institute is a good neutral place to check what your policy actually covers before you assume.

If your basement is leaking right now, here is the move. Get eyes on it. We do a free inspection, a free estimate, and we get your quote back within 24 hours. We will show you what is happening, recommend the smallest fix that solves it, and stand behind the work. Financing is available through Hearth, subject to approval, and we make nothing on it.

Read our full approach on the basement waterproofing page, and see exactly what we promise on the 603 guarantee.

Call us at 603-610-1770 or book your free inspection. We will get your basement dry and keep it that way!

Related questions

Can I just seal the crack myself? A surface patch hides it for a while, then water finds the path again behind the patch. We inject the crack full-depth so it seals from front to back. Crack injection runs $1,000 to $3,000 and carries a 10-year warranty.

Does the Forever Dry System work in a crawl space? No. The Forever Dry System is for basements only. A crawl gets crawl space encapsulation instead, which uses a 12-mil wall and 20-mil floor vapor barrier with a dehumidifier and sump. That runs $3,000 to $25,000.

What happens to the sump pump in a power outage? A battery backup takes over and keeps pumping. The sump system carries a 3-year warranty, batteries excluded. We size the pump to the drain length, one half horsepower per 120 feet.

Is the dry guarantee transferable if I sell? Yes, the Forever Dry warranty transfers to the next owner. It stays valid as long as no other contractor or homeowner alters the work, since outside changes void the transfer.