Crawl space repair is the work of fixing what has failed under your floor and stopping the water that usually caused it. For most Atlanta homes it comes down to two jobs done together: drying the space out (a sealed vapor barrier, drainage, a sump pump, or a dehumidifier) and fixing the structure (crack injection in the block, carbon-fiber straps on a bowing wall, new drop girders, or steel columns to lift a sagging floor). What you need depends on what is failing and why, so the honest answer always starts with somebody getting under the house and looking.
What affects crawl space repair cost and scope
No two crawl spaces fail the same way. These are the things that move a job from a half-day fix to a week of work.
| Driver | What changes | Why it matters |
|---|---|---|
| Where the water comes from | Surface runoff, a high water table, or a plumbing leak | A regrade and gutter fix is small. An interior French drain and sump pump is a bigger job. |
| How far the structure has moved | A hairline crack, a bowing block wall, or a floor you can feel dip | Sealing a crack is quick. Stabilizing and leveling a floor is the heavy end. |
| Condition of the wood | Dry and solid, or rotted from moisture or chewed up by termites and critters | Bad girders and joists get replaced before anything can be leveled. |
| Size and access | A tall, open crawl, or a 24-inch belly-crawl packed with ductwork | Tight access slows every step and adds labor. |
| Moisture system you pick | Drainage only, or full encapsulation with a dehumidifier | Encapsulation costs more up front and does more for humidity and indoor air. |
We quote pricing after we look, not from a chart. Once we have seen your crawl, you get an honest range for your house.
How to tell your crawl space needs repair
You usually feel it before you see it. Watch for:
- Floors that bounce, dip, or slope. Set a marble down and it rolls to one wall.
- A musty smell in the house that gets worse in summer.
- Standing water or mud under the house after a hard rain.
- Doors and windows that stick when the seasons turn wet.
- Mold on the joists, or a white crust (efflorescence) on the block walls.
- Clammy air upstairs and a cooling bill that keeps climbing.
Atlanta makes all of this worse. Our red clay holds water and shifts as it swells and dries, and we get two wet stretches a year: spring storms, then the summer humidity that is sitting on the city right now. A crawl space that was fine for a decade can turn after one soggy spring.
What crawl space repair actually includes
Most jobs are some mix of three things.
Moisture control comes first, because water is almost always the root cause. Outside, that can mean regrading and fixing gutters so runoff stops pouring against the foundation. Inside, it is an interior French drain running to a sump pump, a sealed vapor barrier across the ground, and sometimes a dehumidifier.
Structural work handles what the water already damaged. We use crack injection to seal foundation cracks, carbon-fiber straps to hold a bowing wall, new drop girders and sistered joists where the framing has sagged, and interior steel columns to lift and level a floor that has settled.
Encapsulation is the upgrade that seals the whole space so it stops breathing humid outside air. In our climate it does the most for the musty smell and the summer dampness.
We also repair framing that termites or animals chew up, and we seal the entry points they used to get in. We handle the damage and the exclusion; your pest company handles the treatment.
A look from under the house
Last spring I crawled under a 1968 ranch off Clairmont in Decatur. The homeowner had two quotes telling her she needed her whole floor system replaced. What she actually had was one rotted drop girder and a downspout dumping straight against the foundation a few feet away. We fixed the downspout, replaced the one girder, set steel columns under the low spot, and sealed the ground. Her floor stopped bouncing, and she paid for the job she had, not the one a sales script wanted to sell her.
That is the whole reason I am still the one crawling under these houses. You cannot diagnose a crawl space from a clipboard in the driveway.
What to expect when you call us
We come out and get under the house first. You get a plain explanation of what is wrong, what is causing it, and the smallest fix that actually solves it. Small problems run a day or two. A full structural and encapsulation job can run a week or more. We will not push the big package when a downspout and one beam will do, and we will not quote a price before we have seen the dirt.
Want more straight answers about what is going on under your house? Read the rest of our writing on the blog.