How Much Does a Structural Engineer Cost in the UK? (2026)
Quick answer: In 2026, UK structural engineers typically charge £90–£200 an hour or a fixed fee. Expect roughly £175–£350 for an inspection, £500–£2,000 for a written report, and anything from about £60 to £950 for beam calculations when removing a wall. Loft conversion and extension designs usually run about £750–£2,200, rising with complexity.
Structural engineer costs at a glance
| Job | Typical UK cost in 2026 | Notes |
| Hourly rate | £90–£200 | Most guides sit between £90 and £200 |
| Inspection (site visit) | £175–£350 | Often verbal advice or a short note |
| Written report | £500–£2,000 | Around £1,000 is a common mid-point for a home |
| Structural survey | £400–£1,000 | Depends on property size (see below) |
| RSJ / steel beam calculations | £60–£950 | Simple single beams sit at the lower end |
| Loft conversion or extension design | £750–£2,200 | Higher for complex or multi-storey work |
| Complex residential project | Up to about £10,000 | Large alterations, new structure, several drawings |
Sources: HomeOwners Alliance, MyBuilder, Checkatrade . Prices are indicative, vary by region and provider, and may or may not include VAT.
Why cost guides disagree
Three of the most-read UK guides give different numbers for the same job. HomeOwners Alliance lists inspections at £175–£300 and reports at £500–£2,000. MyBuilder gives inspections at £175–£350 and reports at £500–£2,000, with an average report around £1,000. Checkatrade puts hourly rates at £100–£200. The gap comes from what is included. A £400 quote might be a single calculation. A £1,500 quote might include calculations, drawings for Building Control, a site visit and one round of revisions. Always compare the scope, not just the total.
Cost by job type
Inspection or site visit: about £175–£350. The engineer visits, looks at the problem (a crack, a bowed wall, a wall you want to open up) and tells you what they think. You may get verbal advice or a short written note. If you need something you can show a lender, Building Control or an insurer, ask for a report.
Written report: about £500–£2,000. A formal document with findings, analysis and recommendations that you can pass to builders, architects and Building Control. Price rises with the size and condition of the property and how much investigation is needed.
Structural survey by property size. MyBuilder’s guide gives these ranges:
| Property | Typical survey cost |
| 1 to 2 bed flat or terraced house | £400–£550 |
| 3 bed semi-detached | £500–£700 |
| 4+ bed detached | £700–£1,000 |
| Commercial or mixed use | £1,000+ |
If you are comparing this with a surveyor’s report, read what a structural survey covers.
Removing a load-bearing wall or fitting a steel beam: about £60–£950 for calculations. That is the range HomeOwners Alliance gives for RSJ calculations. A single beam over a simple opening is usually at the lower end; several beams, point loads from above, or an unusual span push it up. You will also need drawings and a Building Control application, so ask whether those are part of the fee. See how we handle structural calculations and load-bearing wall removal.
Loft conversion or extension: about £750–£2,200. This is the typical range for a loft or extension consultation and design, covering floors, beams, roof structure and foundations where relevant. Dormers, hip-to-gable work and rear extensions with large openings cost more. Related reading: loft conversion drawings, structural calculations for a house extension and our house extension guide.
Chimney breast removal: often £400–£800.
What changes the price
- Scope: calculations only, calculations plus drawings, or a full structural package.
- Complexity: number of beams, spans, loads from floors and roofs above, foundations, and whether the building is old or has been altered before.
- Location: London quotes are commonly higher because of access, parking and tighter sites.
- Number of site visits and revisions: extra visits and Building Control comments add time.
- Timing: urgent jobs cost more.
- VAT: some quotes include it, some do not. Ask.
- Hourly or fixed fee: hourly suits open-ended investigation; a fixed fee suits a defined job.
Do you need a structural engineer?
If you are changing the structure of your home, almost always yes. Haringey Council’s building control guidance lists structural alterations, including removing a load-bearing wall, partition, beam or chimney breast, as work that needs Building Regulations approval, and says converting a loft also needs approval. The engineer’s calculations are what Building Control reviews to approve the work. You can read the rules for structure in Approved Document A on GOV.UK.
Typical triggers:
- Removing or opening up a load-bearing wall
- Adding steel beams or lintels
- Converting a loft
- Building an extension
- Cracks, sagging floors or roof movement
- Buying a property with a structural concern in the surveyor’s report
Building Regulations and planning permission are separate. A wall removal may need no planning permission but still needs Building Regulations approval. If your wall is shared with a neighbour, you may also need a party wall notice under the Party Wall etc. Act 1996.
Hourly rate or fixed fee?
For a defined job such as one beam or one loft conversion, ask for a fixed fee in writing. For investigation where the problem is unclear (for example, a crack of unknown cause), an hourly rate or an inspection-then-report approach is more realistic. Whichever you choose, get the scope, number of site visits, revisions and VAT written down.
How to hire a structural engineer
- Check credentials. HomeOwners Alliance recommends a chartered engineer, with letters such as MIStructE or MICE after the name, and notes that some experienced engineers are not chartered. You can search the IStructE directory at istructe.org/find-an-engineer to confirm a member and their CPD status.
- Ask for a written scope. Calculations, drawings, site visits, revisions, Building Control liaison, VAT.
- Ask about insurance. Professional indemnity insurance is standard for this work.
- Compare like with like. Two quotes only compare if the scope is the same.
- Check they have done your type of job in your type of property (for example, Victorian terrace, flat, conservation area).
Structural engineer, architect or surveyor?
| Professional | What they do | When you need them |
| Structural engineer | Calculates loads and designs beams, foundations and supports | Wall removal, extension, loft, structural defects |
| Architect or architectural designer | Designs the layout and prepares planning and building regulation drawings | Planning applications, redesigns |
| Surveyor | Inspects and reports on condition | Buying a property, assessing defects |
Many London projects need an architect and an engineer working together so that the drawings and calculations agree. See our structural engineering services and building regulation drawings.
Our view at Online Architectural Services
How We Quote Structural Work at Online Architectural Services
When quoting structural packages, we operate on a fixed-fee basis tied strictly to the architectural design and scope rather than open-ended hourly billing. Our quotes cover the full engineering design pack: full structural calculation packs (BS / Eurocode standards), structural layout drawings, connection and beam details, and any necessary site inspection data. Crucially, our fee includes end-to-end liaison with Building Control – whether you choose the local authority or an Approved Inspector – meaning we directly answer technical plan queries and revisions required by the inspector at no additional cost until Full Plans approval is achieved. What typically swings a London quote up or down comes down to Victorian/Edwardian party-wall intricacies, foundation depths driven by London shrinkable clay or mature street trees, whether steels require temporary propping across tricky multi-storey loads, and whether existing structural drawings already exist versus requiring intrusive site investigations.
Real Case: Single-Storey Rear Extension & Internal Knock-Through
“A Victorian terraced house in Wandsworth needed a 4.5m single-storey rear kitchen extension, chimney breast removal, and the removal of an internal spine load-bearing wall. The engineer’s fee covered a physical measured site survey, full structural calculations (steel beam design, padstones, and splice connections), coordination drawings for the builder, and responding to local authority technical queries. The quote was £1,250 + VAT, the final fee was £1,250 + VAT, and Wandsworth Building Control approved the structural package in 11 days.”
Typical Structural Engineering Fee Ranges
| Project Scope | What’s Covered | Typical Fee Range (+ VAT) |
| Internal Wall Removal / Knock-Through | RSJ/steel beam calculations, padstone specification, bearing checks, and mark-up plan for Building Control. | £350 – £650 |
| Loft Conversion (Dormer / Mansard) | Floor joist strengthening, ridge & purlin steel beams, dormer timber frame sizing, and stair opening calculations. | £850 – £1,450 |
| Single-Storey Rear / Side-Return Extension | Roof structure/cranked beams, rear bi-fold goalpost frame, foundations/trench fill details, and Building Control liaisons. | £950 – £1,800 |
FAQs
How much does a structural engineer cost in the UK? Most UK structural engineers charge £90–£200 an hour or a fixed fee. Inspections are about £175–£350, reports £500–£2,000, and loft or extension designs around £750–£2,200. Complex projects can reach several thousand pounds.
How much does an RSJ calculation cost? HomeOwners Alliance gives £60–£950 for RSJ calculations. A single beam over a simple opening usually sits at the lower end; several beams or unusual loads cost more. Ask whether drawings for Building Control are included.
How much is a structural engineer for a loft conversion? Around £750–£2,200 is a typical range for loft or extension structural design, depending on whether you need dormers, hip-to-gable work or extra beams. London projects with tight access may cost more.
Do I need a structural engineer to remove a load-bearing wall? Yes. Removing a load-bearing wall needs Building Regulations approval, and Building Control will expect structural calculations showing the beam and supports are adequate.
Does a structural engineer have to be chartered? Not necessarily, but chartered engineers (for example MIStructE or MICE) are generally recommended. Check membership on the IStructE directory and ask what similar jobs they have completed.