Building Control Approval
REQUIRED
Full Plans or Building Notice submission needed
Complete Guide to Building Regulations Compliance
Updated for 2026 with Approved Documents A-R
UK Building Regulations set minimum standards for design, construction, and alterations to buildings. Administered by Building Control, these regulations ensure buildings are safe, accessible, energy-efficient, and structurally sound. Our comprehensive guide covers all Approved Documents A-R effective in 2026, helping homeowners, builders, and developers navigate compliance requirements.
Building Regulations apply to most construction work in England and Wales, including new builds, extensions, conversions, structural alterations, and installations. Failure to comply can result in enforcement notices, prosecution, difficulties selling property, and expensive remedial work. This guide provides practical information on when regulations apply, approval processes, and specific requirements across all parts of the regulations.
Determine which regulations apply to your project
Building Regulations in England and Wales are divided into Approved Documents labeled A through R. Each document addresses specific aspects of building design and construction. Major updates in 2026 include enhanced energy efficiency standards (Part L), revised fire safety requirements (Part B), and updated accessibility provisions (Part M).
| Work Type | Regulations Apply? | Key Requirements |
|---|---|---|
| New Build (any size) | YES - Full Compliance | All Approved Documents A-R applicable |
| Extension > 30m² | YES - Full Approval | Parts A, B, C, F, L, M required |
| Extension < 30m² (single storey) | YES - Simplified | Thermal elements, ventilation, drainage |
| Conservatory < 30m² | EXEMPT if separated | Thermal separation from house required |
| Loft Conversion | YES - Full Compliance | Structure, fire escape, insulation, stairs |
| Garage Conversion | YES - Full Compliance | Insulation, ventilation, fire separation |
| Window Replacement | YES - Part L only | FENSA/Certass registered or BC notification |
| Electrical Work (new circuits) | YES - Part P | Competent person or BC notification |
| Boiler Replacement | YES - Part L & J | Gas Safe registered installer required |
| Structural Alterations | YES - Full Approval | Structural calculations mandatory |
Each Approved Document provides practical guidance on meeting Building Regulations requirements. Here's a comprehensive overview of all parts relevant to domestic and commercial construction in 2026.
Covers: Structural stability, foundations, walls, floors, roofs
Key Requirements: Load-bearing capacity, wind resistance, ground movement protection
When Applies: All new builds, extensions, structural alterations
Professional Input: Structural engineer for complex work
Covers: Fire detection, means of escape, fire spread, access for firefighters
Key Requirements: 30-min fire doors, escape windows, smoke alarms, compartmentation
When Applies: Extensions, loft conversions, new builds, material changes of use
Critical For: Multi-storey buildings, flats, HMOs
Covers: Damp-proofing, drainage, contaminated land, subsoil drainage
Key Requirements: DPC/DPM installation, cavity trays, ventilation, tanking
When Applies: All construction involving ground contact
Typical Specs: 1200-gauge DPM, 150mm min DPC above ground
Status: Formally withdrawn - no longer applicable
Historic Purpose: Addressed cavity wall insulation foam
Current Guidance: Covered under health and safety legislation
Note: Urea formaldehyde foam no longer used
Covers: Acoustic insulation between dwellings, internal rooms
Key Requirements: Party walls, floors between flats, separating walls
When Applies: New builds, conversions to flats, material change of use
Testing: Post-completion sound testing may be required
Covers: Fresh air provision, extract ventilation, air quality
Key Requirements: Trickle vents, extract fans, background ventilation
When Applies: All new habitable rooms, extensions, replacements
Typical Spec: Kitchen: 30L/s extract, bathroom: 15L/s
Covers: Bathrooms, hot water safety, water consumption, drainage
Key Requirements: 125 litres/person/day max, TMV valves, drainage sizing
When Applies: All dwellings, new bathrooms, plumbing alterations
Testing: Drainage pressure/air tests required
Covers: Foul drainage, rainwater disposal, septic tanks, soakaways
Key Requirements: Proper falls, access, ventilation, connection to sewer
When Applies: All drainage work, new connections, extensions
Standards: BS EN 752 drainage systems, Building Regs 2015
Covers: Boilers, flues, ventilation, solid fuel appliances
Key Requirements: Adequate combustion air, flue sizing, CO alarms
When Applies: All heating installations, boiler replacements
Registration: Gas Safe (gas) or HETAS (solid fuel) required
Covers: Stairs, ramps, guarding, vehicle barriers
Key Requirements: Max rise 220mm, min going 220mm, handrails >600mm wide
When Applies: New stairs, loft conversions, balconies, guarding
Critical Heights: Guarding required >600mm drop
Covers: Insulation, airtightness, heating efficiency, renewable energy
Key Requirements: SAP calculations, U-values, airtightness testing
When Applies: All new builds, extensions, renovations, replacements
2026 Standards: Enhanced U-values, fabric-first approach
Covers: Level access, door widths, accessible WC, wheelchair access
Key Requirements: 900mm min doorways, Part M4(1) Category 1 minimum
When Applies: New dwellings, material change of use, extensions
Categories: M4(1) standard, M4(2) accessible, M4(3) wheelchair
Status: Incorporated into Part K and Approved Document K
Current Location: Glazing safety now covered in Part K
Requirements: Safety glazing in critical locations
Standards: BS 6206 impact performance classification
Covers: Overheating mitigation in new residential buildings
Key Requirements: Solar gain limits, ventilation strategy, glazing ratios
When Applies: New dwellings from June 2022 onwards
Exemptions: Extensions, conversions (guidance only)
Covers: Electrical installations, new circuits, testing
Key Requirements: Competent person scheme or BC notification
When Applies: New circuits, consumer units, outdoor electrics, bathrooms
Registration: NICEIC, NAPIT, ELECSA certification
Covers: Doors, windows, and burglary resistance
Key Requirements: PAS 24 doors/windows on accessible openings
When Applies: New dwellings only (not extensions/renovations)
Standards: Tested to BS PAS 24:2016 security
Covers: EV charging point provision in new buildings
Key Requirements: Cable routes, charge point installations
When Applies: New dwellings and buildings with parking
Spec: Min 7kW Mode 3 socket outlet or tethered cable
Covers: Broadband ducting and connection points
Key Requirements: In-building physical infrastructure for broadband
When Applies: New buildings and major renovations
Spec: Connection to access point at plot boundary
Building Regulations compliance is verified through Building Control approval. You can use either Local Authority Building Control (LABC) or an Approved Inspector. Both routes provide statutory approval and have similar processes and costs.
✓ Two Approval Routes Available:
| Inspection Stage | When Required | What's Checked |
|---|---|---|
| 1. Excavation Inspection | Before concrete poured | Foundation depth, soil type, width, steel reinforcement |
| 2. Foundation Concrete | Before backfilling trenches | Concrete quality, depth achieved, drainage below foundations |
| 3. DPC/DPM Inspection | Before floor slab/screed | Damp-proof membrane, insulation, oversite preparation |
| 4. Drains Inspection | Before covering/backfilling | Drainage runs, falls, bedding, air/pressure test witnessed |
| 5. Steel Beams/Lintels | After installation, before covering | Correct size, bearing lengths, padstones, structural compliance |
| 6. Roof Structure | Before insulation/plasterboard | Roof trusses/rafters, bracing, wind bracing, spans |
| 7. Insulation Inspection | Before concealment | Wall/roof/floor insulation thicknesses, U-value compliance |
| 8. Final Inspection | On completion | Full compliance check, fire safety, ventilation, completion certificate issued |
Building Control fees vary by Local Authority and project size. Approved Inspectors often charge competitively. Fees typically split into Plan Fee (payable on submission) and Inspection Fee (payable before first inspection).
| Project Type | Typical Fee Range | What's Included |
|---|---|---|
| Small Extension < 10m² | £350-£550 | Plan check + 3-4 site inspections + completion certificate |
| Extension 10-40m² | £500-£850 | Full Plans approval + 4-5 inspections + certificate |
| Extension 40-100m² | £800-£1,400 | Full Plans + 5-6 inspections + structural review |
| Loft Conversion | £600-£1,100 | Plans + fire safety review + 4-5 inspections |
| Garage Conversion | £450-£750 | Plans + 3-4 inspections + thermal compliance |
| New House (3-bed) | £1,200-£2,000 | Full Plans + SAP review + 6-8 inspections + certificate |
| New House (4-5 bed) | £1,800-£3,000 | Full Plans + comprehensive inspections + testing |
| Structural Alterations Only | £400-£700 | Plans check + steel inspection + sign-off |
| Window Replacement (notification) | £100-£200 | Notification processing (if not FENSA registered) |
| Regularisation Certificate | 150-200% premium | Retrospective approval + investigation + testing |
Understanding typical compliance issues helps avoid delays and remedial work. Building Control officers commonly identify these problems during inspections.
⚠️ Top 10 Building Regulations Failures:
Beyond Building Control fees, most projects require professional input for design, calculations, and compliance certification.
| Professional Service | Typical Cost 2026 | When Required |
|---|---|---|
| Architect (Design & Drawings) | £1,500-£5,000 | Complex extensions, new builds, planning applications |
| Structural Engineer (Calculations) | £400-£1,500 | Steel beams, loft conversions, structural alterations |
| SAP Assessment (Part L) | £300-£600 | New builds, extensions >50m², significant renovations |
| EPC (Energy Performance Certificate) | £60-£120 | New builds, selling property, renting property |
| Fire Safety Consultant | £800-£2,500 | Flats, HMOs, complex escape routes, tall buildings |
| Acoustic Testing (Part E) | £400-£800 | New builds with party walls, conversions to flats |
| Air Tightness Testing | £350-£600 | New builds Part L compliance (>50m²) |
| Drainage Design & Calculations | £300-£800 | Complex drainage, pumped systems, treatment plants |
Permitted Development Rights allow certain construction without planning permission, but Building Regulations still apply. These are separate approvals - one does not exempt you from the other.
🏡 Key Differences:
Building Regulations differ across UK nations. England and Wales share similar systems, while Scotland and Northern Ireland have distinct regulations.
System: Approved Documents A-S
Approval: Building Control (LA or Approved Inspector)
Energy Standards: Part L 2021 + Future Homes Standard 2025
Website: gov.uk/building-regulations
System: Scottish Building Standards (Sections 0-7)
Approval: Local Authority Building Standards only
Energy Standards: Section 6 - often more stringent than England
Website: gov.scot/building-standards
System: Technical Booklets A-V
Approval: District Council Building Control
Energy Standards: Part F (Conservation of fuel and power)