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Full technical pack for Building Control — sections, details, thermal and structural notes.
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Four moves that separate a smooth job from a nightmare.
Inadequate detail
Builder needs precise drawings. Cheap drawings missing detail.
Part L thermal compliance
Insulation specifications. Cheap drawings non-compliant.
Structural calcs missing
Engineer needed for beams, walls. Add to fees.
Multiple revisions
Building inspector requests changes. Iteration cost.
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-storey extensionStandard
£800–£2.2k
Two-storey extensionMore complex
£1.2k–£3.5k
Loft conversionStructural focus
£1k–£2.8k
Full new-build houseComprehensive
£2.5k–£10k
Listed building worksSPAB-experienced
£1.5k–£5.5k
Building Regs application feeCouncil fee
£200–£900
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Architectural Services explained
Building Regs drawings show technical compliance — structure, fire, thermal, electrical. Separate from planning. Expect to pay £800–£3,500 for UK Building Regs drawings.
What Does the Work Involve?
Architectural technician produces detailed technical drawings. Specifications for: foundations, structure (Part A), fire escape (Part B), moisture (Part C), thermal (Part L), ventilation (Part F), electrical (Part P), drainage (Part H). Application submitted to building control.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Single-storey extension | 800 | 2,200 | Standard |
| Two-storey extension | 1,200 | 3,500 | More complex |
| Loft conversion | 1,000 | 2,800 | Structural focus |
| Full new-build house | 2,500 | 10,000 | Comprehensive |
| Listed building works | 1,500 | 5,500 | SPAB-experienced |
| Building Regs application fee | 200 | 900 | Council fee |
| Structural engineer calcs | 500 | 3,500 | For structural elements |
How Long Does It Take?
Drawing preparation: 2-4 weeks. Building Regs approval: 5 weeks. Building inspector site visits during build.
DIY or Professional?
Architectural technician (CIAT) or architect. Structural engineer for structural elements.
Choosing the Right Tradesperson
CIAT or RIBA architect. Building Regs experience. Local council relationship.
UK Regulations
Building Regs 2010. Approved Documents A-P. Local council building control. Some elements self-certified via Competent Person Schemes.
Common Problems
- Inadequate detail: Builder needs precise drawings. Cheap drawings missing detail.
- Part L thermal compliance: Insulation specifications. Cheap drawings non-compliant.
- Structural calcs missing: Engineer needed for beams, walls. Add to fees.
- Multiple revisions: Building inspector requests changes. Iteration cost.
Frequently Asked Questions
Planning vs Building Regs drawings?
Planning: appearance and impact. Building Regs: technical compliance. Both usually needed.
Architect or technician?
Standard extensions: technician fine. Complex modern design: architect. Listed: architect with heritage experience.
Cost vs total build?
Building Regs drawings: 3-5% of build cost. Specialist projects: more.
Structural engineer essential?
For load-bearing walls, beams, lintels: yes. £500-£3,500 fees.
How long does approval take?
Building Regs approval: 5 weeks. Site visits during build: ongoing.
Self-certification possible?
Some elements via Competent Person Schemes (electricians, gas engineers). Not full Building Regs.
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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