What a Foundation Inspection Should Actually Cover (2024)

TL;DR: A proper foundation inspection covers six things: exterior crack width and pattern, interior wall and door alignment, slab moisture readings, drainage grading around the perimeter, crawlspace or basement conditions, and a level check across the floor. A standalone inspection from a structural engineer runs $300 to $800 in 2024, while a foundation repair company's "free inspection" often skips the engineering report and pushes straight to a repair quote.

_Last reviewed: July 2026 · 7 min read_

Cracks in the drywall, a door that suddenly sticks, a hairline line running up the garage wall — these are the moments homeowners start Googling "foundation inspection near me" at 11pm. The problem is most people don't know what a thorough inspection actually looks like, so they can't tell if the contractor who showed up did a real job or just glanced at the crack and quoted $12,000 in piers.

Okoniq Property Hub keeps a running log of every crack, measurement, and repair estimate tied to your address, so you have a clear record if you ever need to compare inspections or dispute a claim.

What should the exterior inspection cover?

The exterior check should measure every visible crack with a tool, not just eyeball it. An inspector should note the width in inches or millimeters (anything wider than 1/4 inch usually gets flagged for monitoring), whether the crack is vertical, horizontal, or stair-step through mortar joints, and whether it's wider at the top or bottom — a sign of active movement versus old settling.

They should also walk the full perimeter checking grading. Soil should slope away from the foundation at roughly 6 inches over the first 10 feet. If downspouts dump water right at the foundation wall, that's often the actual cause of the crack, not a structural defect. This is a common miss — see 5 signs your downspouts are dumping water in the wrong place for what bad grading looks like before it becomes a foundation problem.

What should the interior inspection cover?

Inside, the inspector should check every interior door and window for square, not just the ones that already stick. A tape measure across the door frame diagonals (top-left to bottom-right, top-right to bottom-left) should read within about 1/8 inch of each other; anything more suggests the frame has racked from movement below.

They should also run a level or use a laser across the main floor. A slope of more than 1 inch over 20 feet is usually the threshold engineers use to recommend further evaluation. Cracks in interior drywall, especially diagonal ones running from the corners of doors and windows, get documented the same way as exterior cracks — width, direction, and whether they're new or painted-over old damage.

What should a basement or crawlspace check include?

It should include a moisture and pest check in addition to structural cracks. Standing water, damp insulation, or a musty smell in a crawlspace often points to a drainage problem long before it becomes a structural one — and a slab leak under the floor can mimic foundation settling by softening the soil underneath a slab unevenly.

A good inspector checks the sump pump (if there is one) actually cycles, looks at support piers or columns for plumb, and checks for efflorescence — that white chalky residue on block or poured walls that signals water has been moving through the concrete for a while.

| What's Checked | Basic Walk-Around | Full Inspection | |---|---|---| | Crack measurement | Visual only | Width recorded with tool | | Door/window square | Not checked | Diagonal measurement taken | | Floor level | Skipped | Laser or level reading across rooms | | Drainage grading | Sometimes mentioned | Full perimeter walk with slope check | | Written report | Rarely | Engineer's stamped report available | | Cost | Free (sales visit) | $300–$800 |

Who should actually do the inspection?

A licensed structural engineer should do it if you want an unbiased report, not a company that also sells the repair. Foundation repair companies often offer free inspections, and that's fine for a first look, but their incentive is to find something to sell. If a "free inspection" results in a same-day quote for helical piers or slab jacking without measurements or photos, that's a red flag worth a second opinion.

An independent structural engineer's report typically costs $300 to $800 depending on region and home size, and includes actual documentation — crack widths, floor elevation surveys, and photos — that you can take to a second contractor for a competing bid. That report is also what most insurance companies and buyers want to see if the issue comes up later during a sale.

How does drainage tie back into foundation health?

Poor drainage is the single most common cause of foundation movement that isn't actually a structural defect. Water pooling against the foundation wall softens the soil unevenly, which causes the exact cracking and door misalignment described above, and it's often fixable for a few hundred dollars in regrading or downspout extensions instead of tens of thousands in piers.

Before paying for expensive underpinning, check the basics: gutters clear, downspouts extending at least 4 to 6 feet from the wall, and grading sloping away from the house. 6 downspout mistakes that send water into your basement covers the most common setup errors that mimic structural failure.

FAQ

How much does a foundation inspection cost in 2024?

An independent structural engineer's inspection typically runs $300 to $800, while inspections offered free by foundation repair companies usually come bundled with a sales pitch for repair work.

How do I know if a crack is serious or just cosmetic?

Cracks wider than 1/4 inch, that run diagonally from door or window corners, or that are noticeably wider at one end than the other are worth a professional look; hairline vertical cracks under 1/8 inch in poured concrete are usually just curing shrinkage.

Should I get a foundation inspection before buying a house?

Yes, especially on homes over 20 years old or in areas with clay soil; a $400 engineer's report is cheap insurance compared to discovering a $15,000 repair after closing.

Can bad drainage really cause foundation problems?

Yes, uneven soil moisture from poor grading or downspouts dumping water at the wall is one of the most common causes of foundation cracking and settling, and it's often far cheaper to fix than the crack itself suggests.

Do foundation cracks always mean I need piers or underpinning?

No, many cracks are stable and only need monitoring and drainage correction; piers and underpinning are typically reserved for active, worsening movement confirmed by an engineer's measurements over time.

This is educational information, not structural engineering advice. Call a licensed structural engineer for any crack wider than 1/4 inch, active movement, or if a door or window has visibly shifted out of square.