Extensions in Portslade: design, planning and build
We design and build house extensions for homes in Portslade and the surrounding East Sussex area, with guide prices adjusted for the region.
- Postcode districtsBN3, BN41
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Portslade home?
The South East has a broad mix of 1930s semis, post-war estates, newer developments and period cottages, and many houses have enough garden for a generous rear extension.
Start by comparing wraparound extensions, single-storey rear extensions and orangery extensions: between them they cover most of the layouts we see requested for houses like these.
Portslade and surrounding towns
Our survey diary covers Portslade, including BN3, BN41. The same team covers Hove (2 miles), Brighton (3 miles), Peacehaven (10 miles), Seaford (15 miles), Uckfield (16 miles), all within easy reach. For homes towards West Sussex, Shoreham-by-Sea is around 3 miles away.
Planning and building control in Portslade
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Popular extension prices in Portslade
Every figure below is a guide for Portslade, adjusted for South East England build costs (×1.12) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
All extension types we build in Portslade
- Timber frame extensions · from £23,500
- Glass box extensions · from £33,500
- Building regulations for extensions · from £1,000
- Bungalow extensions · from £29,000
- Side extensions · from £24,500
- Side return extensions · from £20,000
- Conservatory replacement extensions · from £22,000
- Orangery extensions · from £33,500
- Kitchen extensions · from £30,000
- Porch extensions · from £4,450
- Utility and boot room extensions · from £15,500
- Extensions over a garage · from £26,500
- Pitched roof extensions · from £24,500
- Home office extensions · from £17,500
- Bedroom extensions · from £29,000
- Single-storey rear extensions · from £23,500
- Flat roof extensions · from £23,500
- Annexe extensions · from £61,500
- Extension plans and drawings · from £1,300
- Double-storey extensions · from £42,500
- Planning permission for extensions · from £350
- Wraparound extensions · from £40,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Portslade
How much does an extension cost in Portslade?
Using our South East England factor (×1.12), a standard-spec single-storey extension of 20 m² is a guide £45,500 to £58,500 including VAT, and a 32 m² two-storey extension £64,500 to £84,500. Your written price follows the survey.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Portslade, and the guide-price tool gives a range for your own size and finish in about a minute.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
How long does an extension take in Portslade?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Portslade
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.