A structural engineer in the UK typically costs £75–£125 per hour, or around £400–£600 per day. For fixed-fee jobs, RSJ or steel beam calculations usually cost £300–£900, loft conversion calculations £600–£1,800, extension structural design £400–£2,000, and a detailed structural report £500–£1,500 or more.
This guide explains what structural engineers charge for common home projects, how rates vary across the UK, and how to keep the cost down.
Structural Engineer Cost UK 2026: Quick Summary
| Structural engineer job | Typical fee |
|---|---|
| RSJ / steel beam calculations | £300 – £900 |
| Removing an internal load-bearing wall | £300 – £500 |
| Chimney breast removal | £100 – £500 |
| New door or window openings | £150 – £500 |
| Loft conversion calculations | £600 – £1,800 |
| House extension structural design | £400 – £2,000 |
| Structural inspection (single issue) | £200 – £600 |
| Detailed structural report | £500 – £1,500+ |
| Cracks, movement or subsidence investigation | £300 – £1,500+ |
| Full structural design for a new house | £2,000 – £5,000 |
Figures are based on 2026 UK cost guides (sources listed at the end). Most guides do not say whether VAT is included, so check each quote. Prices vary by location, complexity and whether a site visit is needed. Use them as a guide, not a quote.
How Much Does a Structural Engineer Cost per Hour?
Most UK structural engineers charge £75–£125 per hour, or £400–£600 per day. Rates are higher in London and the South East and for complex work. Many engineers quote a fixed fee for small domestic jobs instead of charging by the hour.
| Location | Hourly rate | Day rate |
|---|---|---|
| London and South East | £90 – £150 | £500 – £700 |
| Major cities (e.g. Manchester, Leeds, Birmingham) | £75 – £130 | £450 – £600 |
| Smaller cities and large towns | £65 – £115 | £400 – £550 |
| Rural and remote areas | £60 – £100 | £350 – £500 |
How Much Do Structural Calculations for a Steel Beam Cost?
Structural calculations for an RSJ or steel beam usually cost £300–£900. A single beam over a simple opening is at the lower end, while several beams, point loads or padstones push the price up. Remember that the engineer's fee is separate from the cost of the steel itself: supplying and installing an RSJ typically costs £1,500–£2,500 more.
Structural Engineer Cost for Knocking Down a Wall
Removing an internal load-bearing wall usually needs structural calculations costing around £300–£500. The engineer will specify the size of beam, the bearings and any temporary support, which Building Control will need to see before work starts.
Structural Engineer Cost for a Loft Conversion
Structural calculations for a loft conversion typically cost £600–£1,800. They cover new floor joists, steel beams, any changes to the roof structure and dormer framing. These calculations are usually needed alongside your building regulations drawings. See our loft conversion cost guide for build prices.
Structural Engineer Cost for a House Extension
Structural design for an extension usually costs £400–£2,000, depending on its size and design. A simple single-storey extension sits at the lower end, while double-storey extensions, large openings or steel frames cost more. For the build cost itself, read our house extension cost guide.
How Much Does a Structural Survey or Report Cost?
A structural inspection of a single issue, such as a crack or a sagging roof, typically costs £200–£600. A detailed structural report costs £500–£1,500 or more, and an investigation into cracking, movement or subsidence typically costs £300–£1,500 or more, depending on how much monitoring is needed.
What Affects Structural Engineer Fees?
- Complexity: a single beam is quick, while lofts, basements and new builds take much longer.
- Site visit: desk-based calculations from drawings cost less than a visit and inspection.
- Location: London and the South East are typically the most expensive.
- Quality of drawings: clear, accurate drawings save the engineer time.
- Revisions: design changes and Building Control queries can add fees.
- Urgency: fast turnaround may cost extra.
Do You Need a Structural Engineer?
You usually need a structural engineer if your project changes the structure of the building, for example:
- removing or altering a load-bearing wall
- installing steel beams for open-plan living
- loft conversions and dormers
- extensions, especially with large openings or a second storey
- removing a chimney breast
- investigating cracks, movement or subsidence
Building Control normally asks for structural calculations as part of a building regulations application, so plan for them alongside your building regulations drawings.
How Long Do Structural Calculations Take?
Simple domestic calculations are often issued within a few working days. Loft conversions, extensions and new builds can take longer, especially if revisions or coordination with the designer and Building Control are needed.
How to Save Money on a Structural Engineer
- Provide clear, accurate drawings so the engineer can work from them without extra visits.
- Group all structural items into one appointment, rather than asking for calculations one at a time.
- Get at least three quotes, and check whether VAT and site visits are included.
- Confirm what is included, such as calculations only or calculations with drawings and Building Control queries.
- Choose an engineer who is a member of a recognised body such as the IStructE or ICE.
Drawings and Estimates from Nextron Estimating
A structural engineer works best with clear drawings, and a builder needs an accurate price. At Nextron Estimating, we prepare drawings and detailed estimates for UK homeowners, builders and contractors.
- Building regulations drawings: for your Building Control application
- Construction drawings: detailed drawings for building on site
- Loft conversion estimating and house extension estimating: itemised prices from your drawings
You may also find our architect fees guide helpful when budgeting for professional fees.
Frequently Asked Questions
How much does a structural engineer cost in the UK?
Typically £75–£125 per hour or £400–£600 per day. Fixed fees for small domestic jobs often start from around £300.
How much do structural calculations for a steel beam cost?
Usually £300–£900, depending on the number of beams and loads. The steel and installation cost extra.
How much does a structural engineer cost for a loft conversion?
Around £600–£1,800 for the structural calculations.
How much does a structural engineer cost for an extension?
Usually £400–£2,000, depending on the size and complexity of the extension.
How much is a structural engineer's report?
A single-issue inspection costs £200–£600, and a detailed structural report costs £500–£1,500 or more.
Do I need a structural engineer to remove a wall?
If the wall is load-bearing, yes. Calculations for removing a load-bearing wall typically cost £300–£500.
Do structural engineer fees include VAT?
Not always. Many engineers quote plus VAT, so check each quote.
Sources
Need Drawings or a Cost Estimate?
Send us your project details and we will quote for building regulations drawings, construction drawings or a detailed cost estimate. If you want to see our format first, ask for a free sample.
Call us on +44 7576 532125, or email info@nextronestimating.co.uk.
