Rear extensions in Reigate and Banstead depend on the house. Typical homes here: Victorian and Edwardian terraces and villas in Reigate and Redhill town centres; 1930s semi-detached houses in Nork, Banstead, Earlswood and Merstham. Designations to check first: Green Belt; Surrey Hills National Landscape; Conservation areas. Applications are decided by Reigate and Banstead Borough Council and the Reigate and Banstead Core Strategy 2014 and Development Management Plan 2019.
The permitted development rules for rear extensions
On a house, a single-storey rear extension is permitted development if it projects no more than 3 m from the original rear wall on a terraced or semi-detached house, or 4 m on a detached house, is no higher than 4 m, has eaves no higher than 3 m where it comes within 2 m of a boundary, and uses materials similar in appearance to the house. The larger home extension route allows 6 m or 8 m through a 42-day prior approval, where the council consults the neighbours.
Flats and maisonettes have no householder permitted development rights, so any rear extension to a flat needs planning permission. Previous extensions count against the allowance, and the larger home extension route is not available in conservation areas.
What changes in Reigate and Banstead
In a conservation area a single-storey rear extension can still be permitted development within the 3 m or 4 m limit, but cladding it in materials that differ from the house is not, and the 6 m and 8 m prior approval route is closed.
The local constraints that most often decide the route in Reigate and Banstead are listed below, taken from our Reigate and Banstead area page. Each one is a reason to confirm the address on Reigate and Banstead's constraints map before relying on permitted development.
- Green Belt. Most of the borough outside Reigate, Redhill, Banstead and Horley is Green Belt, including land around Kingswood, Chipstead, Merstham, Salfords and the North Downs. Source
- Surrey Hills National Landscape. The North Downs above Reigate, including Reigate Hill, Colley Hill and the scarp towards Merstham, fall within the Surrey Hills National Landscape (formerly the Surrey Hills Area of Outstanding Natural Beauty). Source
- Conservation areas. Reigate town centre, Banstead, Chipstead, Kingswood and Merstham are among the borough's conservation areas. Source
- River Mole and Redhill Brook flood risk. The River Mole and its tributaries run through Horley, Salfords and Sidlow, and the Redhill Brook drains Redhill and Earlswood towards the Mole. Source
- Listed buildings. Reigate town centre, Banstead, Chipstead, Merstham and the villages contain many listed houses, cottages and churches. Source
What Reigate and Banstead planning officers look for
On the 1930s semis in Nork, Banstead, Earlswood and Merstham they tend to look for two-storey side extensions set back from the front wall and below the main ridge, a gap kept to the side boundary so the pair does not read as a terrace, and rear extensions that pass the 45-degree test to the neighbour's nearest habitable window. 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 disproportionate additions in the Green Belt. The council offers a paid pre-application service.
Fees and timelines
Reigate and Banstead 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.
- Reigate and Banstead Borough Council: planning: the council's own constraints map, validation checklist and pre-application service.
