Two-storey extensions in Enfield depend on the house. Typical homes here: 1930s semi-detached houses in Southgate, Oakwood, Winchmore Hill, Enfield Town suburbs and Edmonton; Victorian and Edwardian terraces in Palmers Green, Bowes Park, Edmonton and Ponders End. Designations to check first: Green Belt; Lee Valley flood risk; Conservation areas. Applications are decided by London Borough of Enfield and the Enfield Local Plan (Core Strategy 2010 and Development Management Document 2014).
The permitted development rules for two-storey extensions
A two-storey rear extension is permitted development only within tight limits: no more than 3 m deep, at least 7 m from the rear boundary, no higher than the existing house, eaves matching the existing eaves, materials similar in appearance, and any upper-floor side window obscure-glazed and non-opening below 1.7 m.
Most two-storey extensions exceed one of those limits, most often the 7 m rear boundary rule on London plots, so the usual route is a householder planning application. Flats have no permitted development rights.
What changes in Enfield
Extensions of more than one storey are not permitted development in a conservation area, so planning permission is always needed there.
The local constraints that most often decide the route in Enfield are listed below, taken from our Enfield area page. Each one is a reason to confirm the address on Enfield's constraints map before relying on permitted development.
- Green Belt. Enfield has one of the largest Green Belt areas of any London borough, covering Crews Hill, Botany Bay, Forty Hill, Whitewebbs, Trent Park and the fringes of Enfield Chase. Source
- Lee Valley flood risk. The eastern edge of the borough along the River Lee and its tributaries (Salmons Brook, Pymmes Brook, Turkey Brook) sits in Flood Zones 2 and 3, affecting parts of Edmonton, Ponders End, Enfield Lock and Brimsdown. Source
- Conservation areas. Enfield has numerous conservation areas, including Enfield Town, Forty Hill, Bush Hill Park, Winchmore Hill Green, Southgate Green, the Lakes Estate and Trent Park. Source
- Article 4 directions. Several Enfield conservation areas, including Bush Hill Park and the Lakes Estate, have Article 4 directions removing permitted development for front alterations, boundary walls and some roof works. Source
What Enfield planning officers look for
Common refusal reasons are two-storey side extensions flush with the front wall that create a terracing effect, rear extensions deeper than the neighbour's, front dormers, and box dormers that wrap the hip. The council offers a paid pre-application service and decisions often run beyond 8 weeks, so allow 10–14 weeks.
Fees and timelines
Enfield decides a householder application or a Lawful Development Certificate within 8 weeks of validation. The council fee is £528 for a householder application and £264 for a Lawful Development Certificate (England, from 1 April 2025; verify before applying).
Our own fee is fixed once quoted. The quote tool gives an indicative figure in minutes and a written quote follows within 24 hours.
Primary sources
- The Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2: the permitted development limits quoted above.
- Planning Portal: do you need permission: the national guidance and the application service every council accepts.
- London Borough of Enfield: planning: the council's own constraints map, validation checklist and pre-application service.
