Portslade, East Sussex
Side return extension in Portslade
Infilling the narrow passage beside a Victorian or Edwardian back addition. If you live in Portslade and want to know what a side return extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Portslade (BN1, BN3 and BN41) as part of our East Sussex work. Side return projects in Portslade usually start with a drainage survey of the side passage.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a side return extension cost in Portslade?
A side return extension in Portslade is priced at £2,580–£4,260 per square metre including VAT as a guide, before kitchen fit-out and fees. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £31,000–£51,000 |
| 2.5 m wide × 7 m deep (17.5 m²) | £45,000–£74,500 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a side return extension in Portslade?
Here is how the rules in England apply to a side return extension in Portslade.
Side return infills and the side leg of a wraparound are treated as side extensions in England: single-storey, no more than 4 metres high and no wider than half the original house. They are not permitted development in conservation areas, National Parks or National Landscapes, and a joined wraparound often needs a planning application because the side and rear rules apply together.
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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Portslade like to extend?
Commuter semis and detached houses make up much of Portslade, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a side return extension in Portslade comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Side return extensions near Portslade
We also build side return extensions in nearby Hove (2.3 miles) and Shoreham-by-Sea (2.6 miles).
- Side return extension in Hove
- Side return extension in Shoreham-by-Sea
- Side return extension in Brighton
- Side return extension in Lancing
- Side return extension in Hurstpierpoint
Other work in Portslade:
FAQ
Side return extension questions in Portslade
Can you match the brick or stone on my Portslade house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
What postcode areas do you cover around Portslade?
Including BN1, BN3 and BN41, and the surrounding East Sussex area.
Glass roof or solid roof with rooflights?
A glass roof gives the most light; a solid roof with long rooflights is warmer and quieter in rain. Both work.
How long does a rear extension take to build in Portslade?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.