Two-storey wraparound extensions in East Grinstead
We plan and build two-storey wraparound extensions for homeowners in East Grinstead and nearby. Every project starts with a free visit and a design stage priced in writing before any work begins.
What we'd confirm first for a project in East Grinstead.
- Postcode districts
- RH19
- County / area
- West Sussex, England
- Price region
- South East England
- Guide price
- £132,500–£181,500 (£2,360–£3,250 per m²)
- Approval route
- Planning permission is needed: the side part takes it outside permitted development in England.
- Nearest towns
- Horley (7.5 miles), Crawley (7.7 miles), Crowborough (8.5 miles)
- Distance to Crawley
- about 7.7 miles
- First visit
- Free, no obligation
About a two-storey wraparound extension
A two-storey wraparound extension is an L-shaped addition that extends both the side and the rear of your house, on two floors. It gives one of the largest gains in floor space of any extension, typically a big open-plan kitchen and living area below and two or more bedrooms or bathrooms above. In England it needs planning permission, because the side part is more than one storey.
We cover East Grinstead (RH19) and the places around it, including Horley (7.5 miles), Crawley (7.7 miles) and Crowborough.
What it costs in East Grinstead
Most of the cost of a two-storey wraparound extension is set by its size and specification. For East Grinstead and the rest of South East England, our guide is £2,360–£3,250 per m² including VAT, so about £132,500–£181,500 for an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space). These are guides, not quotes. Ground conditions, steelwork and access can move the figure either way.
| Spec | Per m² | An L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space) |
|---|---|---|
| Essential | £2,180–£2,990 per m² | £122,000–£167,000 |
| Standard | £2,360–£3,250 per m² | £132,500–£181,500 |
| Premium | £2,840–£3,890 per m² | £159,000–£218,000 |
Planning and building regulations in East Grinstead
In England, a two-storey wraparound extension needs householder planning permission, because any extension beyond a side wall must be single storey to be permitted development. The application costs £548 (or £575 for applications made from 8 December 2026). Councils weigh the side part against the street scene and the rear part against neighbours' light and outlook, and should decide within 8 weeks of validation.
Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.
Design points for East Grinstead homes
Two roofs that meet
A wraparound needs the side roof and rear roof to join cleanly, often with a valley or hip where they meet. Getting pitches and ridge heights right keeps rainwater moving and avoids a bulky mass at the back corner, which neighbours and planners notice.
Daylight to the middle
A deep L-shaped plan can leave the middle of the ground floor dark, because the old rear rooms are now enclosed. We use wide rear openings, a well-placed stair and, where part of the extension is single storey, roof lights, while keeping total glazing within the Part L allowance.
How we'd run your project
Measure and listen
A visit to East Grinstead to understand how you live in the house now and what the extra rooms need to do, plus a first look at the structure.
Get it approved
Once you're happy with the design we submit it to the council for East Grinstead and deal with any questions from the planning officer.
Fixed price in writing
With approved drawings and calculations, we give you a fixed build price and a programme you can plan around.
Build
Foundations, walls, floor, roof, windows, then first and second fix. We break through into the house as late as we can.
Questions about two-storey wraparound extensions in East Grinstead
Do I need planning permission for a two-storey wraparound extension in East Grinstead?
East Grinstead is in England, so England planning rules apply. Planning permission is needed: the side part takes it outside permitted development in England. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.
How much does a two-storey wraparound extension cost in East Grinstead?
Our guide for South East England, which covers East Grinstead, is £2,360–£3,250 per m² including VAT. A typical project with an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space) comes to about £132,500–£181,500. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Who handles building regulations for a project in East Grinstead?
We handle it as part of the project. What's needed in England: building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end. We prepare the drawings and the engineer's calculations, book the inspections and pass you the completion paperwork at the end.
Can a wraparound extension be part single, part two-storey?
Yes. Many wraparounds keep the rear part single storey with roof lights over the kitchen and put the two-storey part to the side. This can reduce the effect on neighbours and the cost. We set out both options at the design stage, so you can compare floor space against price before choosing.
Can I stay at home during a wraparound extension?
Many people do, but a wraparound affects two sides of the house and usually the kitchen, so there will be weeks without a full kitchen. We plan a temporary kitchen, keep a route through the house and seal off the work area. For some families, moving out while the rear wall is opened up is easier.
Nearby
Close to East Grinstead? We work across the area, including:
Other extensions in East Grinstead
- Rear
- Side
- Part two-storey
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in East Grinstead · Two-storey wraparound extensions across West Sussex
The quickest next step is a visit. We'll look at your house in East Grinstead and give you an honest view of the options.