East Grinstead, West Sussex
Side return extension in East Grinstead
Side return extension in East Grinstead: infilling the narrow passage beside a Victorian or Edwardian back addition. We measure the house, show you what the rules allow, price it in writing and build it.
East Grinstead and its postcode districts RH19 are part of our West Sussex coverage. In East Grinstead we check the boundary line and the neighbour's gutter before drawing a side return, because a few centimetres decide whether the wall goes on or beside the boundary.
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 East Grinstead?
For East Grinstead we work from the South East England rate: £2,580–£4,260 per square metre of new floor, including VAT, standard specification. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a side return extension in East Grinstead?
Planning for a side return extension in East Grinstead follows the English householder rules.
In England the side part of a side return or wraparound must meet the side-extension rules (one storey, under 4 metres high, no more than half the width of the original house), and those rights do not apply on designated land. Because a wraparound combines a side and a rear extension, many need householder planning permission.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in East Grinstead like to extend?
East Grinstead has a mix of Victorian terraces near the centre and larger Edwardian and inter-war houses further out. Clay soils across much of the South East mean deeper foundations near trees, which we plan for at the survey.
How a side return extension in East Grinstead comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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 East Grinstead
From East Grinstead, the nearest places we also cover are Horley (7.5 miles) and Crawley (7.7 miles).
- Side return extension in Horley
- Side return extension in Crawley
- Side return extension in Crowborough
- Side return extension in Broadfield
- Side return extension in Oxted
Other work in East Grinstead:
FAQ
Side return extension questions in East Grinstead
Do I need planning permission for a rear extension in East Grinstead?
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.
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 combine a side return with a rear extension?
Yes; that is a wraparound extension, and it gives the biggest open-plan room a terrace can have.
Do you handle building control in East Grinstead?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can you match the brick or stone on my East Grinstead house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Is the site visit in East Grinstead free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.