Structural Engineer vs. Home Inspector:
What Each One Does, and When the Report Says to Call One

What the home inspector does with a structural finding

A home inspection in Oregon and Washington is a limited, visual, non-invasive look at the accessible parts of the house, done under the state Standards of Practice (OAR 812-008 in Oregon, WAC 308-408C in Washington). The inspector is a generalist. Russ walks the roof when it’s safe, crawls the crawlspace, checks the attic, and looks at framing, foundation walls, floors, and ceilings for signs that something has moved.

For a structural condition, that means documenting what’s visible. Where the crack is. What pattern it follows. Whether one side sits higher than the other. Whether there’s water staining or efflorescence (the white mineral crust left when water moves through concrete). Whether the floor above it slopes.

What the inspector can’t do is open walls, dig at a footing, run load calculations, or watch a crack for six months. So the report describes and points. One of Russ’s recent reports found cracks in the walls and ceilings of three neighboring rooms, with an uneven floor slab under them, and said the combination suggested movement or settlement in that part of the house.

That’s an accurate observation. It’s also about as far as a visual inspection can take it. The next sentence in that report sends it to a structural engineer, who can work out the cause and what would stop it.

What a structural engineer adds

A structural engineer is a licensed professional engineer who works out how loads move through a building and what happens when something in that path fails. On a house visit, they look at one problem, or a short list of them, in much more depth than a whole-house inspection allows.

A typical residential evaluation can include:

• Floor elevation readings across the house with a digital level, to map how much and where it has dropped
• A closer look at the foundation, framing, and connections around the problem area
• An opinion on the likely cause, such as soil settlement, poor drainage, undersized framing, or an old alteration
• An opinion on whether the movement looks ongoing or old and stable
• A repair recommendation, and sometimes a stamped repair design with calculations

That last item is a big part of why the referral exists. A contractor can bid an engineer’s design. A permit office can review it. And if the house needs work on a cut roof truss, a removed bearing wall, or a failing retaining wall, many jurisdictions will want an engineer’s design before they’ll issue the permit.

Oregon licenses engineers through the Oregon State Board of Examiners for Engineering and Land Surveying (OSBEELS). In Washington it’s the Board of Registration for Professional Engineers and Land Surveyors. Both have an online license lookup, and it takes a minute to check.

Findings that usually lead to the referral

Not every crack gets one. Russ’s reports describe hairline foundation cracks, typical garage slab cracks, and minor drywall cracks at door corners all the time without sending anyone to an engineer. The referral comes when the finding suggests movement that’s large, ongoing, or affecting the load path. In his recent reports, those included:

• A horizontal crack or inward bow in a foundation wall
• Stair-step cracks in block or brick with one side displaced
• Cracks in walls and ceilings that line up with a sloping or uneven floor in the same area
• A roof truss web that had been cut with no engineered repair
• A sagging roof ridge
• A retaining wall that was leaning, displaced, or had already failed
• Floor framing with amateur alterations, like added posts sitting on blocks or soil
• Gaps in the load path at crawlspace cripple walls
• A wall over a garage door that had bowed inward at the header
• A chimney that was leaning and pulling away from the house

The foundation cracks guide goes deeper on which crack patterns mean what. For sloping floors in older houses, the post on out-of-level floors covers the usual causes, and the retaining wall failure post covers walls on the lot.

Engineer, or foundation contractor?

A lot of Russ’s report language says “a qualified structural engineer or contractor.” Both are reasonable next calls. They do different jobs.

A structural engineer is paid for an opinion and, if you want one, a repair design. They don’t sell the repair. A foundation repair company sends someone to look at the problem and quotes the work the company would do, and many of them don’t charge for the visit. That’s useful, too. The contractor’s evaluation and the scope of the fix come from the same company, though, and that’s worth knowing when you read it.

Some buyers do both. The engineer says what’s wrong and what a fix needs to include, and then contractors bid against that scope. Others go straight to a contractor for something simple, like a single failed post in a crawlspace. Which route fits depends on the problem and the time you have, and that’s a conversation for you and your agent.

Fitting an engineer into the inspection window

Inspection contingencies are short, and engineers aren’t always available on a few days’ notice. The buyers who get the evaluation done in time are usually the ones who call the same day the report arrives, or earlier. Russ walks buyers through the major findings at the end of the inspection, so a structural concern often comes up before the report is even in your inbox.

The post on using your inspection contingency covers how the window works in Oregon and Washington. A few things help the engineer’s visit go faster:

If the engineer can’t come in time, say so to your agent right away. What happens next with the contract is between you, your agent, and the seller.

Structural engineers and building inspectors get confused, too. The building inspector vs. home inspector post sorts out who does what at the permit office. To get a house inspected before the contingency clock starts running down, you can book online any day of the week.