Permitted Development Extensions in the UK

Maximum extension sizes without planning permission. This guide walks through the planning route, the most common refusal reasons, and how Scapely's AI Objection Risk Analyzer de-risks the deal at scan-time.

Permitted Development Extensions by council

The viability of permitted Development Extensions swings sharply with local Article 4 designations, Gateway status and build cost. See council-specific guidance below:

• Permitted Development Extensions in City of London Corporation — £3500/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in City of Westminster — £3400/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Camden — £3200/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Islington — £3100/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Hackney — £2900/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Tower Hamlets — £3000/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in Royal Borough of Greenwich — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Lewisham — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Southwark — £3000/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Lambeth — £2950/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Wandsworth — £2850/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Hammersmith and Fulham — £3100/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in Royal Borough of Kensington and Chelsea — £3500/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in London Borough of Waltham Forest — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Redbridge — £2600/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Havering — £2500/sqm, Gateway 1
• Permitted Development Extensions in London Borough of Barking and Dagenham — £2500/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Newham — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Bexley — £2500/sqm, Gateway 1
• Permitted Development Extensions in London Borough of Bromley — £2600/sqm, Gateway 1
• Permitted Development Extensions in London Borough of Croydon — £2650/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Sutton — £2550/sqm, Gateway 1
• Permitted Development Extensions in London Borough of Merton — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Royal Borough of Kingston upon Thames — £2750/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Richmond upon Thames — £2850/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Hounslow — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Hillingdon — £2500/sqm, Gateway 1
• Permitted Development Extensions in London Borough of Ealing — £2750/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Brent — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Harrow — £2650/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Barnet — £2700/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Haringey — £2750/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in London Borough of Enfield — £2600/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Manchester City Council — £2150/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Salford City Council — £2050/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Liverpool City Council — £1900/sqm, Gateway 1
• Permitted Development Extensions in Bolton Council — £1900/sqm, Gateway 1
• Permitted Development Extensions in Stockport Metropolitan Borough Council — £2000/sqm, Gateway 1
• Permitted Development Extensions in Leeds City Council — £1950/sqm, Gateway 1
• Permitted Development Extensions in Sheffield City Council — £1950/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in City of York Council — £2150/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Hull City Council — £1800/sqm, Gateway 1
• Permitted Development Extensions in City of Bradford Metropolitan District Council — £1850/sqm, Gateway 1
• Permitted Development Extensions in Newcastle City Council — £1850/sqm, Gateway 1
• Permitted Development Extensions in Sunderland City Council — £1800/sqm, Gateway 1
• Permitted Development Extensions in Birmingham City Council — £2100/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in Coventry City Council — £1950/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in City of Wolverhampton Council — £1900/sqm, Gateway 1
• Permitted Development Extensions in Nottingham City Council — £2050/sqm, Gateway 3, Article 4 active
• Permitted Development Extensions in Leicester City Council — £1900/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Derby City Council — £1900/sqm, Gateway 1
• Permitted Development Extensions in Bristol City Council — £2300/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Bath and North East Somerset Council — £2400/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Plymouth City Council — £1950/sqm, Gateway 1
• Permitted Development Extensions in Exeter City Council — £2100/sqm, Gateway 1
• Permitted Development Extensions in Bournemouth, Christchurch and Poole Council — £2150/sqm, Gateway 2
• Permitted Development Extensions in Brighton & Hove City Council — £2500/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Southampton City Council — £2150/sqm, Gateway 2
• Permitted Development Extensions in Portsmouth City Council — £2100/sqm, Gateway 2
• Permitted Development Extensions in Reading Borough Council — £2400/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Oxford City Council — £2650/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Milton Keynes City Council — £2200/sqm, Gateway 1
• Permitted Development Extensions in Cambridge City Council — £2600/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Norwich City Council — £2050/sqm, Gateway 1
• Permitted Development Extensions in Peterborough City Council — £1950/sqm, Gateway 1
• Permitted Development Extensions in Cardiff Council — £1900/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Swansea Council — £1850/sqm, Gateway 1
• Permitted Development Extensions in Glasgow City Council — £1950/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in City of Edinburgh Council — £2150/sqm, Gateway 2, Article 4 active
• Permitted Development Extensions in Aberdeen City Council — £1900/sqm, Gateway 1
• Permitted Development Extensions in Dundee City Council — £1850/sqm, Gateway 1
• Permitted Development Extensions in Belfast City Council — £1850/sqm, Gateway 1