Planning Permission vs Building Regulations

The essential position

Planning permission controls whether development is acceptable in land-use and design terms. Building Regulations control how building work meets technical standards for health, safety, accessibility and performance. Many residential projects need both, and approval under one system does not imply approval under the other.

Key points

• Planning assesses use, scale, appearance, amenity and policy.
• Building Regulations assess structure, fire, energy, ventilation, drainage and other technical requirements.
• Permitted development can remove the need for a planning application but not usually Building Regulations.
• Other consents—listed building, Party Wall, freeholder or covenant—may also apply.

1. What planning permission considers

Planning decisions are made in accordance with the development plan unless material considerations indicate otherwise. For residential work, officers may consider design, scale, massing, materials, neighbour amenity, parking, trees, heritage, flood risk and the effect on the street or countryside.

Planning drawings communicate the existing site and the external proposal. They are not normally a complete construction specification.

• Land use and development principle.
• Relationship with neighbours and public realm.
• Local character, heritage and environmental constraints.

2. What Building Regulations consider

Building Regulations contain functional requirements covering structure, fire safety, site preparation, moisture, sound, ventilation, sanitation, drainage, combustion appliances, protection from falling, energy, accessibility, electrical safety, security, high-speed electronic communications and infrastructure for electric-vehicle charging where applicable.

Compliance is demonstrated through drawings, specifications, calculations, certificates and site inspections. Approved Documents provide guidance, but alternative compliant solutions can be possible.

• Detailed construction build-ups.
• Structural and energy calculations.
• Inspection and completion evidence.

3. Typical approval combinations

An extension outside permitted development normally needs a planning application and Building Regulations approval. A permitted development loft may use an LDC plus Building Regulations. Internal structural alterations may need Building Regulations but no planning application.

A listed property can require listed building consent even for internal work that would not otherwise need planning permission. Leasehold and party-wall procedures sit outside both systems.

• Map every consent before committing to construction.
• Do not treat a planning decision as technical approval.
• Retain all approvals for future sale.

4. Why the drawing packages are different

Planning drawings should be clear, accurate and focused on the proposal’s external and spatial impact. Building Regulations drawings need enough technical information to demonstrate compliance and coordinate consultant designs.

Using planning drawings alone for contractor pricing leaves major assumptions unresolved. That can lead to inconsistent quotations, variations and site decisions made without coordinated details.

• Complete technical design before tender where possible.
• Identify design responsibility for specialist items.
• Update drawings when approved changes occur.

Questions homeowners commonly ask

Official guidance and further reading

• GOV.UK: planning permission
• GOV.UK: Building Regulations approval