Side extensions in Epping Forest depend on the house. Typical homes here: 1930s semi-detached and detached houses in Loughton, Buckhurst Hill, Chigwell and Theydon Bois; Large detached houses on generous plots in Chigwell, Chigwell Row and Theydon Bois. Designations to check first: Epping Forest Special Area of Conservation; Green Belt; Conservation areas. Applications are decided by Epping Forest District Council and the Epping Forest District Local Plan 2011–2033.
The permitted development rules for side extensions
A single-storey side extension is permitted development on a house if it is no wider than half the width of the original house, no higher than 4 m, with eaves no higher than 3 m where it comes within 2 m of a boundary, and finished in materials similar in appearance to the house.
Anything wider than half the original house, any two-storey side extension, and any side extension on a flat needs planning permission. Garage conversions that keep the walls are usually permitted development; extending beyond them is assessed as a side extension.
What changes in Epping Forest
Side extensions are not permitted development in a conservation area at all, so there a planning application is always required.
The local constraints that most often decide the route in Epping Forest are listed below, taken from our Epping Forest area page. Each one is a reason to confirm the address on Epping Forest's constraints map before relying on permitted development.
- Epping Forest Special Area of Conservation. Epping Forest is a Special Area of Conservation, and the council requires new homes within its zone of influence to mitigate air-quality and recreational-pressure effects, usually through a financial contribution and a habitats assessment. Source
- Green Belt. Most of the district outside the built-up areas of Loughton, Buckhurst Hill, Epping, Waltham Abbey and Ongar is Metropolitan Green Belt, and it also washes over Chigwell Row, Theydon Bois and many villages. Source
- Conservation areas. The district's conservation areas include Epping High Street, several in Loughton and Buckhurst Hill, Chigwell village and Waltham Abbey town centre, along with many villages such as Theydon Bois, Ongar and Roydon. Source
- River Roding and River Lee flood risk. Land alongside the River Roding through Chigwell, Loughton, Abridge and Ongar, and alongside the River Lee and the Lee Navigation around Waltham Abbey and Roydon, sits in Flood Zones 2 and 3. Source
- Listed buildings. Epping High Street, Waltham Abbey, Chigwell village, Ongar and the rural parishes contain many listed houses, inns and churches, including the Abbey Church at Waltham Abbey. Source
What Epping Forest planning officers look for
Epping Forest officers assess householder applications against the Local Plan 2011–2033 and the council's supplementary guidance on residential extensions. On the 1930s semis and detached houses of Loughton, Buckhurst Hill and Chigwell 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, rear extensions that pass the 45-degree test to the neighbour's nearest habitable window, and hipped roofs kept where a gable would unbalance the pair. Common refusal reasons are full-width box dormers, side extensions that create a terracing effect, and disproportionate Green Belt extensions. Outside conservation areas, hip-to-gable and rear-dormer lofts within 50 m³ on a semi are routinely lawful and we secure a Lawful Development Certificate as proof.
Fees and timelines
Epping Forest 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.
- Epping Forest District Council: planning: the council's own constraints map, validation checklist and pre-application service.
