London Extension Guides by Borough
Every London borough has different planning policies, conservation areas, and design expectations. These guides break down the rules, costs, and constraints specific to your borough so you know exactly what to expect before starting your extension project.
Borough Extension Guides
Detailed guides covering planning rules, permitted development restrictions, conservation areas, and typical extension costs for each borough.
PD rules, conservation areas, and extension costs in Barnet.
Extension data, planning approval rates, and cost benchmarks.
Planning rules, Article 4 directions, and local policies.
Planning data, approval rates, and borough-specific costs.
Conservation area rules, basement policies, and design guidance.
Extension data and planning analysis for the Square Mile.
Planning data and extension cost benchmarks for Croydon.
Local plan policies, PD rules, and extension design guidance.
Planning costs, conservation areas, and extension rules.
Article 4 areas, design policies, and planning constraints.
Extension data, basement Article 4, and borough policies.
Conservation areas, PD rules, and local planning policies.
Planning approval data and extension cost analysis.
Extension data, planning statistics, and cost benchmarks.
Planning data and extension analysis for Hillingdon.
Extension costs, planning approval rates, and local data.
High conservation area coverage, strict design policies, and costs.
Basement policies, Article 4 directions, and premium build costs.
Extension data and planning cost analysis for Kingston.
Local planning rules, conservation areas, and extension guidance.
Planning policies, extension rules, and design guidance.
Extension rules, conservation areas, and local plan policies.
Planning data and extension cost benchmarks for Redbridge.
Conservation areas, riverside restrictions, and premium costs.
Planning costs, design policies, and extension guidance.
Extension data and planning analysis for Sutton.
Conservation areas, planning rules, and local extension guidance.
Planning policies, Article 4 areas, and extension costs.
Planning Refusal Guides
Data-driven analysis of why planning applications get refused in specific boroughs, with advice on how to avoid the most common pitfalls.
Top reasons planning applications are refused in Croydon.
Common refusal reasons and how to avoid them in Enfield.
Why extensions get refused in Greenwich and what to do.
Top refusal reasons in Hammersmith & Fulham.
Planning refusal patterns and advice for Newham.
Related Resources
Compare extension costs across all London boroughs.
London Borough Extension ReportData report covering planning approvals and extensions across London.
Hardest Boroughs for PlanningWhich boroughs have the lowest approval rates and strictest policies.
Article 4 Directions: Complete ListEvery Article 4 direction in London that restricts permitted development.