Loft conversions in Epsom and Ewell depend on the house. Typical homes here: 1930s semi-detached houses in Stoneleigh, West Ewell, Ewell and the Epsom and Ewell part of Worcester Park; Edwardian and inter-war detached houses in Woodcote and around Epsom Downs. Designations to check first: Green Belt; Conservation areas; Hogsmill River flood risk. Applications are decided by Epsom and Ewell Borough Council and the Epsom and Ewell Core Strategy 2007 (new Local Plan emerging).
The permitted development rules for loft conversions
A loft conversion with a rear dormer is permitted development on a house if the added roof volume is no more than 40 m³ on a terraced house or 50 m³ on a semi-detached or detached house, the dormer sits at least 200 mm back from the eaves and no higher than the ridge, there is no dormer on the roof slope facing the road, materials are similar in appearance, and side windows are obscure-glazed.
Flats and maisonettes have no permitted development rights, so a loft to a top-floor flat always needs planning permission. Full-width box dormers that reach the ridge, and hip-to-gable conversions on semis whose volume exceeds 50 m³, also fall outside the allowance.
What changes in Epsom and Ewell
Roof extensions are not permitted development in a conservation area, so a dormer or hip-to-gable there needs a householder planning application designed to the area's appraisal.
The local constraints that most often decide the route in Epsom and Ewell are listed below, taken from our Epsom and Ewell area page. Each one is a reason to confirm the address on Epsom and Ewell's constraints map before relying on permitted development.
- Green Belt. A large share of the borough is Green Belt, including Epsom Common, Epsom Downs, the Hogsmill open space and land around Horton and Langley Vale. Source
- Conservation areas. Epsom town centre, Ewell Village, Stamford Green and Woodcote are among the borough's conservation areas. Source
- Hogsmill River flood risk. The Hogsmill River rises at Ewell and runs through Ewell Village, West Ewell and on towards Kingston, and land alongside it and its tributaries sits in Flood Zones 2 and 3. Source
- Article 4 directions. The council has used, or has consulted on using, Article 4 directions to remove particular permitted development rights, including for converting houses into small houses in multiple occupation and for works in some conservation areas. Source
- Listed buildings. Ewell Village, Epsom town centre and the old hospital estate at Horton contain listed houses, cottages, churches and institutional buildings. Source
What Epsom and Ewell planning officers look for
In the Green Belt officers usually measure the extension against the original dwelling by floorspace or volume and treat outbuildings more strictly. Common refusal reasons are full-width box dormers, side extensions that create a terracing effect, and roof extensions on front slopes in conservation areas. The council offers a paid pre-application service. Decisions can run past the statutory 8 weeks; allow 8–12 weeks.
Fees and timelines
Epsom and Ewell 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.
- Epsom and Ewell Borough Council: planning: the council's own constraints map, validation checklist and pre-application service.
