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Brief a structural engineer.
Beam calcs, lintel sizing, foundation design and surveys — for extensions, lofts and removals.
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Inadequate calculations
Wrong-size beam = failure. Specialist essential.
Mid-design changes
Reworking calcs costs. Plan design before structural.
Site inspection skipped
Builder may deviate. Engineer signs off.
Mismatch with architect
Architectural design + structural must align. Coordinated approach.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Single beam/lintel calcSimple project
£500–£1.5k
Extension structural designFoundations to roof
£1k–£3.5k
Loft conversion structuralFloor + roof structure
£1.5k–£4.5k
Full new build calculationsComprehensive
£2.5k–£10k
Structural survey onlyInspection no design
£500–£2.5k
Site inspection during buildPer visit
£200–£800
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Architectural Services explained
Structural engineers calculate loads and design structural elements. Essential for Building Regs Part A. Expect to pay £500–£10,000+ for UK structural engineering services.
What Does the Work Involve?
Chartered structural engineer surveys project. Calculates loads (dead and live). Designs beams, columns, foundations. Specifies materials and sizes. Produces calculation document for Building Regs. Site inspection during construction.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Single beam/lintel calc | 500 | 1,500 | Simple project |
| Extension structural design | 1,000 | 3,500 | Foundations to roof |
| Loft conversion structural | 1,500 | 4,500 | Floor + roof structure |
| Full new build calculations | 2,500 | 10,000+ | Comprehensive |
| Structural survey only | 500 | 2,500 | Inspection no design |
| Site inspection during build | 200 | 800 | Per visit |
| RICS structural survey | 500 | 3,500 | For pre-purchase |
How Long Does It Take?
Site survey + calculations: 2-4 weeks. Complex projects: 6-10 weeks.
DIY or Professional?
Chartered Structural Engineer (IStructE) only. Building Regs Part A mandatory.
Choosing the Right Tradesperson
IStructE member or RIBA architect with structural training. Local engineer with project experience.
UK Regulations
Building Regs Part A (structure). IStructE professional standards. CDM 2015 for safety.
Common Problems
- Inadequate calculations: Wrong-size beam = failure. Specialist essential.
- Mid-design changes: Reworking calcs costs. Plan design before structural.
- Site inspection skipped: Builder may deviate. Engineer signs off.
- Mismatch with architect: Architectural design + structural must align. Coordinated approach.
Frequently Asked Questions
Structural engineer essential?
For any beam, column, lintel, foundation work: yes. Building Regs Part A requires.
How much for typical extension?
Extension calc: £1,000-£3,500. Loft conversion: £1,500-£4,500. New build: £2,500-£10,000+.
Architect vs structural engineer?
Architect: design, planning, Building Regs drawings. Structural engineer: calculations, structural design. Complementary, both needed.
Site inspection required?
Yes — engineer signs off at foundation, structural completion. Critical for safety.
Cost as % of build?
Structural engineer: 2-5% of build cost typically. Major projects: lower percentage.
How long do calculations take?
Standard project: 2-4 weeks from survey to final calculations. Complex: 6-10 weeks.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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