How much does a structural engineer cost?
Structural engineers charge per element or per day. Estimate the cost of calcs for a typical job below.
When you need an engineer
- 1Removing structure
Any load-bearing wall, beam (RSJ), chimney breast or new opening needs calculations from a structural engineer.
- 2Calcs for building control
The engineer's calculations are what building control signs the structural work off against.
- 3Surveys
For cracking, movement or subsidence concerns, a structural survey/report is a separate, focused piece of work.
The engineer's fee is small next to the works it unlocks, but skipping it isn't an option on structural jobs — building control won't sign off without the calcs. Budget it as a fixed soft cost on any project with a beam, opening or chimney removal.
Structural engineer fees (indicative)
| Service | Basis | Indicative cost |
|---|---|---|
| Beam / single element calcs | per element | £300 – £700 |
| Knock-through (calcs + plan) | fixed | £500 – £1,000 |
| Extension structural design | fixed | £800 – £2,000 |
| Structural survey / report | fixed | £500 – £1,200 |
Fees depend on the number of elements and whether site visits and building-control liaison are included.
Frequently asked questions
How much does a structural engineer cost?+
Calculations for a single beam or knock-through typically cost £300–£1,000; an extension's structural design £800–£2,000; a structural survey/report £500–£1,200. Fees rise with the number of elements and site visits.
Do I need a structural engineer for a knock-through?+
Yes — removing a load-bearing wall requires structural calculations for the supporting beam, which building control approves. It's a required, non-negotiable cost on that kind of work.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.