England
Rear extensions in West Sussex
Rear extensions in West Sussex: we cover 15 towns including Crawley, Worthing and Bognor Regis, with design, approvals and the build under one contract.
What are homes in West Sussex like to extend?
Commuter semis and detached houses make up much of West Sussex, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
Rear extension prices in West 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 West Sussex
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres 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.
Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
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 West Sussex
- Rear extensions for semi-detached houses
- 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
Towns and districts in West Sussex
The main places we cover in West Sussex include Crawley, Worthing and Bognor Regis, across postcode areas BN, PO and RH.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Crawley | RH10, RH11 | Broadfield (1.5 miles) |
| Worthing | BN11, BN12, BN13 | Lancing (2.4 miles) |
| Bognor Regis | PO21, PO22 | Barnham (3.9 miles) |
| Littlehampton | BN17 | Rustington (1.5 miles) |
| Horsham | RH12 | Broadfield (5.8 miles) |
| Chichester | PO19 | Bognor Regis (5.8 miles) |
| Burgess Hill | RH15 | Hurstpierpoint (2.7 miles) |
| East Grinstead | RH19 | Horley (7.5 miles) |
| Shoreham-by-Sea | BN42, BN43 | Lancing (2.1 miles) |
| Lancing | BN15 | Shoreham-by-Sea (2.1 miles) |
- Crawley
- Worthing
- Bognor Regis
- Littlehampton
- Horsham
- Chichester
- Burgess Hill
- East Grinstead
- Shoreham-by-Sea
- Lancing
- Rustington
- Broadfield
- Hurstpierpoint
- Barnham
- Selsey
Areas near West Sussex
FAQ
Questions people ask
How much does a rear extension cost in West 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 West 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 West Sussex do you cover?
15 towns and districts, including Crawley, Worthing and Bognor Regis.
Do you handle building control?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.