England
Rear extensions in East Sussex
Across East Sussex we handle the whole rear extension: survey, drawings, the planning route, building control and the build. Towns we cover here include Brighton, Eastbourne and Hastings.
What are homes in East Sussex like to extend?
Around East Sussex the housing ranges from inter-war semis to 1960s and 1970s estates with good-sized gardens. Many of the newer estates had permitted development rights removed by condition, so we check the planning history before anything is drawn.
Rear extension prices in East Sussex
South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations. Per square metre including VAT, standard specification:
| Extension | Per m² |
|---|---|
| Single-storey rear extension | £2,130–£3,470 |
| Two-storey (per m² across both floors) | £2,020–£3,020 |
| Side return | £2,580–£4,260 |
| Wraparound | £2,460–£4,030 |
| Glass-led | £3,140–£5,380 |
Planning and building rules in East Sussex
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Every rear extension in England needs Building Regulations approval, whether or not planning is needed. You can use the council's building control service or a registered building control approver, by full plans (checked before work, usually within five weeks) or a building notice, and you get a completion certificate at the end.
The Party Wall etc. Act 1996 applies in England: you serve notice two months before work to a shared wall, and one month before digging foundations within 3 metres (or 6 metres for deeper foundations) of a neighbour's building. Neighbours can agree in writing; if they dissent, surveyors agree an award.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
Rear extensions we build in East Sussex
- Rear extensions for detached houses
- Rear extensions for bungalows
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Larger home extension prior approval (England)
- Rear extension plans and planning applications
- Building Regulations for rear extensions
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
Towns and districts in East Sussex
The main places we cover in East Sussex include Brighton, Eastbourne and Hastings, across postcode areas BN and TN.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Brighton | BN1, BN2, BN3 | Hove (1.2 miles) |
| Eastbourne | BN20, BN21, BN23 | Hailsham (6.6 miles) |
| Hastings | TN34, TN35, TN37 | St Leonards-on-Sea (1.5 miles) |
| Hove | BN1, BN3, BN41 | Brighton (1.2 miles) |
| Bexhill-on-Sea | TN38, TN39, TN40 | St Leonards-on-Sea (3.3 miles) |
| Hailsham | BN27 | Eastbourne (6.6 miles) |
| Seaford | BN25 | Newhaven (2.7 miles) |
| Rottingdean | BN1, BN2 | Peacehaven (2.6 miles) |
| Crowborough | TN6 | Royal Tunbridge Wells (6.6 miles) |
| Portslade | BN1, BN3, BN41 | Hove (2.3 miles) |
- Brighton
- Eastbourne
- Hastings
- Hove
- Bexhill-on-Sea
- Hailsham
- Seaford
- Rottingdean
- Crowborough
- Portslade
- Peacehaven
- Uckfield
- Lewes
- Newhaven
- St Leonards-on-Sea
Areas near East Sussex
FAQ
Questions people ask
How much does a rear extension cost in East Sussex?
As a guide, £2,130–£3,470 per square metre including VAT for a standard single-storey extension at South East England rates.
Do I need planning permission in East Sussex?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Which towns in East Sussex do you cover?
15 towns and districts, including Brighton, Eastbourne and Hastings.
Do you handle building control?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.