Planning permission is one of the most searched and misunderstood aspects of home renovation in London. Many renovation projects are delayed, fined, or even reversed because homeowners assume permission is not required — or misunderstand permitted development rules.
At London Renovations, planning compliance is treated as a critical part of every project. This guide explains when planning permission is required for renovations in London, when it is not, how the process works, and how to avoid costly mistakes in 2026.
What Is Planning Permission?
Planning permission is formal approval from your local council that allows certain building works or changes to a property. Its purpose is to ensure developments are safe, appropriate for the area, and compliant with local planning policies.
Not all renovation work requires planning permission — but when it does, it must be secured before construction begins.
Renovation Projects That Usually Require Planning Permission
In London, planning permission is commonly required for:
House Extensions
- Extensions exceeding permitted development size limits
- Double-storey or wraparound extensions
- Extensions close to boundaries
- Extensions on listed buildings
Loft Conversions
- Mansard loft conversions
- Conversions exceeding volume limits
- Properties in conservation areas
External Alterations
- Changes to roof shape or height
- New windows affecting neighbouring privacy
- Front-facing alterations
Listed Buildings & Conservation Areas
Any internal or external work affecting the character of a listed building requires consent — even minor changes.
Renovation Projects That Usually Do NOT Require Planning Permission
Many projects fall under permitted development rights, meaning planning permission is not required if rules are followed.
Common examples include:
- Internal renovations
- Like-for-like kitchen or bathroom refurbishments
- Some loft conversions (e.g. Velux)
- Small rear extensions within size limits
Even when planning permission is not required, Building Regulations approval is still mandatory.
Permitted Development Rules in London (Simplified)
Permitted development allows homeowners to carry out certain works without applying for full planning permission.
Typical limits include:
- Single-storey rear extensions up to 3–4 metres (property dependent)
- Loft conversions within volume limits
- Extensions not exceeding roof height
Rules vary by borough, property type, and designation. Always verify before starting work.
Building Regulations vs Planning Permission
This is a common source of confusion.
Planning Permission
- Controls what you can build
- Managed by the local planning authority
Building Regulations
- Controls how the work is built
- Covers structure, fire safety, insulation, drainage, and energy efficiency
Most renovation projects require Building Regulations approval, even when planning permission is not needed.
The Planning Permission Process in London
Typical Steps
- Site assessment and feasibility review
- Architectural drawings and documentation
- Submission to local council
- Consultation period
- Decision (usually within 8 weeks)
Delays often occur due to incomplete applications or incorrect assumptions.
London Renovations manages planning coordination to avoid these issues.
Common Planning Permission Mistakes to Avoid
Many renovation problems stem from avoidable errors.
Frequent Issues Include:
- Starting work before approval
- Misinterpreting permitted development rights
- Ignoring party wall agreements
- Failing to check conservation area restrictions
- Using non-compliant designs
These mistakes can lead to enforcement notices, fines, or forced demolition.
How Long Does Planning Permission Take?
- Pre-application advice: 2–4 weeks
- Standard application decision: up to 8 weeks
- Complex or listed building applications: 10–13 weeks
Early professional input significantly reduces delays.
Why Professional Planning Support Matters
Navigating planning rules in London is complex, especially across different boroughs.
Professional support ensures:
- Accurate feasibility assessment
- Compliant design proposals
- Faster approvals
- Reduced risk of refusal
- Legal protection for homeowners
London Renovations integrates planning expertise into every renovation project.
Why Choose London Renovations?
London Renovations provides fully managed renovation services, including planning coordination and compliance.
Clients benefit from:
- Planning feasibility assessments
- Architect and consultant coordination
- Full Building Regulations support
- Clear communication with local authorities
- End-to-end project management
Speak to a Renovation Planning Expert
If you’re planning a renovation in London, understanding planning permission early can save time, money, and stress.
Contact London Renovations Ltd today for expert advice on planning permission, design feasibility, and renovation compliance.
