Foundation inspection: who to call and what it costs

Do you need a foundation inspection?

You don’t need one for a small crack in a basement wall that hasn’t changed in years. You do want one when there are signs of movement:

• Stair-step cracks in block or brick, especially if the blocks have shifted.
• Floors that slope more than they used to, or doors in the same area that start to rub.
• A basement wall that bows or leans.
• Repairs from a previous owner with no paperwork.
• Water that keeps coming back at the same corner.
• A repair company has already told you that you need piers.

If you’re buying a home and notice any of these, order the evaluation during your inspection period, not after it.

Home inspector, structural engineer or repair company: who does what

The word “inspection” covers three very different visits. Our structural contributor, Daniel Mercer, separates them like this:

A free inspection can still be helpful. You may get measurements and some documentation. But it’s not an independent report, and no professional seals it. Daniel’s rule: if someone recommends piers, underpinning, new supports or straightening a wall, have an independent engineer evaluate the problem first.

A geotechnical engineer is a fourth specialist, and you’ll need one less often. A structural engineer works out what your house is doing. A geotechnical engineer works out what the soil is doing: its layers, how much load it can carry, groundwater and movement. Daniel brings one in when there’s a lot of movement with no clear cause, deep fill, a hillside, a high water table, suspected sinkholes or old mines, a failed repair, or when piers are being designed. Without that information, he says, nobody should decide how deep piers go or how much they must carry from a crack alone.

1. IfA fine crack that hasn’t changed in years, and nothing else

   ThenNo inspection needed yet. Keep an eye on it. A dated photo makes any change easy to spot.

2. IfYou’re buying a house and want a general check

   ThenA home inspector. If the report flags signs of movement, book a structural engineer before your inspection period ends.

3. IfA crack that’s growing, stair-step cracks with offset, floors or doors that changed, or a wall that bows or leans

   ThenAn independent structural engineer. They measure floor levels and work out whether the house is moving and why.

4. IfA repair company says you need piers, underpinning or wall straightening

   ThenAn independent structural engineer, before you sign. A free inspection comes with what the company sells; nobody seals it.

5. IfA lot of movement with no clear cause, deep fill, a hillside, a high water table, possible sinkholes or old mines, a failed repair, or piers being designed

   ThenA structural engineer, plus a geotechnical engineer. The geotechnical engineer works out what the soil is doing and what it can carry.

What happens during a foundation inspection

Here’s the order Daniel follows on a visit:

1. Questions first. When the cracks appeared, whether they’ve changed, recent renovations, leaks, heavy rain and earlier repairs.
2. The outside. How the ground slopes, where the downspouts end, signs of soil movement, wall corners, masonry and any footings he can see.
3. Floor levels. He takes elevations with a laser or a level and sets reference points. The goal is to find differences between supports, not just to note that a floor slopes.
4. Cracks. Location, width, any step or offset, and direction, photographed with a scale in the frame.
5. Walls. Lean and bowing, measured when he suspects them.
6. Basement or crawl space. If it’s safe to get in: beams, posts, footings, rot and signs of soil pressure.
7. What he can and can’t say yet. Preliminary findings, and what needs a second look.

A typical visit to a house that’s easy to get around takes one to two hours. A tight crawl space, a full set of elevations or damage in several areas can take two to four hours or more. The report comes afterward.

What a good inspection report includes

A good report includes the address, the date, what was evaluated and what wasn’t, and whose name is on it, with their license where one is required. It has numbered photos, a sketch or plan, the measurements and how they were taken. It explains what’s probably causing the problem and what isn’t, how serious it is, and what to do about it, which can be nothing. It also says whether the soil needs testing and what to monitor.

If the report calls for piers, it should say why, what loads were considered and how each pier will be checked when it’s installed.

Daniel gets wary when he sees:

• Five photos and “needs eight piers,” with no elevations.
• Cracks judged only by their width.
• A quote pasted in with no explanation of the cause.
• Nothing about drainage.
• A promise that the whole house will be perfectly level.

Foundation inspection cost

Published national figures for 2026:

These prices are for the evaluation only. They don’t include materials or labor for a repair, and you may pay more or less in your area. Things that raise the price: a large or unusual foundation, hard access, a rush job, extra visits, soil testing and drawings for a repair.

Some towns also require permits for the repair that follows. That’s a separate cost, covered in foundation repair cost.

Buying a house: inspection contingencies and timing

Daniel asks for an evaluation when a house for sale shows stair-step cracks with offset, floors at different levels, doors out of line in the same area, bowing walls, undocumented earlier repairs or water that keeps returning.

Do it during your inspection period, and leave enough time to get the visit done and the report back. If the engineer needs to test the soil or design a repair, it may take longer than your inspection period allows, and you’d need to negotiate an extension with the seller. It depends on your contract: there’s no set number of days across the states where Daniel works.

Questions to ask before you book

• Are you independent of any repair company? Do you sell or install repairs?
• Are you licensed to sign structural reports in this state?
• What will you measure, and will the report include elevations and photos?
• Will the report recommend a repair, or only describe the problem?
• If piers are needed, will you design them or review the contractor’s design?
• What’s the fee, and what costs extra (return visits, soil testing, drawings)?

If a repair is recommended, our guides to foundation settling, helical vs. push piers and foundation repair cost explain the options.