What Does a Structural Engineer's Report Cost, and What's Actually In It?

"Further investigation by a structural engineer is recommended" is one of the most common lines in a RICS survey report — and one of the least explained. Here's what you're actually paying for, what a proper report contains, and when it's genuinely worth commissioning one.

What It Costs

• A straightforward visual inspection and letter for a single dwelling — roughly £300–£600
• A fuller written report, with crack monitoring recommendations and possibly trial pits — £600–£1,500
• A report including calculations — for example, sizing an underpinning scheme or a structural opening — often £1,000–£3,000+, depending on complexity

Cost varies by region and by whether it's a single site visit or a report written up after several months of crack monitoring. A report that follows a proper monitoring period is more useful — and usually cheaper overall — than an urgent single visit with no movement data behind it.

What a Structural Engineer Charges to Look at Cracks

If your RICS survey has flagged cracking, the visit you need is usually the simplest one: an engineer looks at the cracks, inside and out, and writes a letter saying what is causing them and what, if anything, needs doing.

• Visual crack inspection and letter: typically £300–£600 for a house
• London and the South East: expect the top of that range or a little above it
• If the engineer recommends monitoring: budget £300–£800 more for tell-tales or measurements over several months
• If trial pits or a drain survey are needed to see the foundations or rule out a leaking drain: those are extra, often a few hundred pounds each

Ask for the fee and what you will get in writing before the visit. "A letter" and "a report" mean different things to different firms.

Builder or Structural Engineer First?

You don't always need an engineer, and you don't always need a builder. A rough rule:

• Hairline cracks, cracks that were filled and have reopened slightly, cracks at the junction of an extension: a builder can usually tell you whether it's ordinary movement and what the repair costs. Our crack severity checker is a good first step.
• Cracks over 5mm, diagonal cracks from the corners of windows and doors, doors that stick, anything your surveyor says needs a structural engineer: get the engineer. A builder can then price whatever the engineer recommends.

If you are buying, the order that saves the most money is: survey, then a builder's view on whether the cracking looks serious, then an engineer only if it does. If your surveyor has already recommended an engineer, follow that advice and book one before exchange.

What Should Actually Be In the Report

A proper structural engineer's report should include:

• A description of the defect tied to the specific pattern of cracking observed on your property, not generic boilerplate
• A clear recommendation — what is or isn't needed, in plain terms
• If monitoring is recommended, exactly what should be measured and for how long
• Photographs referenced to specific locations, not a loose set of images
• A professional indemnity-insured signature — this is what separates a report from an opinion

If a report you've received reads like a template with your address dropped in, it's worth asking what specifically was assessed.

Get the Right Engineer for the Job

Check membership of the Institution of Structural Engineers (IStructE) — Chartered or Incorporated status confirms independent verification of qualifications, not just a job title on an invoice. It's worth checking the register directly rather than taking a website's word for it.

It's also worth asking whether the engineer designs and oversees remedial schemes themselves, or only diagnoses. There's the same potential conflict of interest here as with damp companies that both survey and sell the treatment — an engineer who profits from recommending an expensive scheme has a different incentive to one who's purely diagnosing. Neither is automatically wrong, but it's a fair question to ask.

When You Actually Need One

A structural engineer is worth commissioning when a crack is wide (more than about 5mm) and still growing, runs diagonally near an opening like a window or door, appears on both the internal and external leaf of the wall in the same place, or is accompanied by doors and windows that have started sticking. Our crack severity checker and guide on subsidence, settlement or thermal movement are a reasonable first step in working out whether you're in that territory.

You don't need one for typical hairline plaster cracking or ordinary seasonal thermal movement — that's the overwhelming majority of cracks in British houses, and no engineer is required to tell you it's fine.

Who Pays When You're Buying a House

If a RICS survey recommends further investigation, commissioning and paying for it is usually down to the buyer, before exchange. It's a cost worth accepting, because doing it beforehand is what gives you the leverage to negotiate the price or walk away — a report that arrives after completion is just information, not a bargaining chip.

Getting the Engineer's Repairs Priced

A good engineer's report ends with a schedule of repairs: what to cut out, what goes in, and how. That is close to a specification, so the repair can be priced from the report itself, without another visit and without asking the seller to let a builder in. If exchange is close, that matters. Can a builder quote without a site visit? explains how a builder prices from a survey or engineer's report, and what still needs a contractor on site.