Two-storey side extensions in East Cowes
If you live in East Cowes and need more room without moving, a two-storey side extension is worth a serious look. We handle the drawings, approvals, structure and build.
East Cowes is outside our usual mainland visit area, so visits and projects here are by arrangement. We'll agree any travel costs with you before anything is booked.
Useful details for planning a two-storey side extension in East Cowes.
- Postcode districts
- PO32
- County / area
- The Isle of Wight, England
- Price region
- South East England
- Guide price
- £94,500–£127,000 (£2,260–£3,030 per m²)
- Approval route
- Planning permission is needed: in England, permitted development only allows single-storey extensions to the side.
- Nearest towns
- Cowes (0.5 miles), Newport (Isle of Wight) (3.9 miles), Ryde (5.8 miles)
- Distance to Newport (Isle of Wight)
- about 3.9 miles
- First visit
- By arrangement
About a two-storey side extension
A two-storey side extension suits a detached or semi-detached house with a side garden, driveway or garage wide enough to build on. You get a design that sits comfortably on the street, a planning application or permitted development check depending on your nation, structural design, building regulations approval and the build itself. We manage the whole process, and the work is carried out by vetted teams working under S&K.
We cover postcode district PO32 in and around East Cowes, along with neighbouring Cowes, Newport (Isle of Wight) and Ryde.
What it costs in East Cowes
Most of the cost of a two-storey side extension is set by its size and specification. For East Cowes and the rest of South East England, our guide is £2,260–£3,030 per m² including VAT, so about £94,500–£127,000 for a 3 m × 7 m footprint on two floors (42 m² of new floor space). Professional fees for drawings and the structural engineer are listed separately on our prices page.
| Spec | Per m² | A 3 m × 7 m footprint on two floors (42 m² of new floor space) |
|---|---|---|
| Essential | £2,070–£2,780 per m² | £87,000–£117,000 |
| Standard | £2,260–£3,030 per m² | £94,500–£127,000 |
| Premium | £2,710–£3,630 per m² | £113,500–£152,500 |
Planning and building regulations in East Cowes
In England, a two-storey side extension always needs householder planning permission, because permitted development only allows single-storey extensions beyond a side wall. The fee is £548 (or £575 for applications made from 8 December 2026), and councils should decide within 8 weeks of validation. Expect them to look at set-back, roof height, gaps to the boundary and the effect on neighbours.
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 Cowes homes
Side windows, boundaries and gutters
Upstairs windows in the side wall face the neighbour, so they are usually obscure-glazed and fixed, or left out. Building close to the boundary also raises questions about foundations, overhanging gutters and access for maintenance, so we design the eaves and gutter to stay within your land.
Access and services
Side extensions often cover the only route to the back garden, a gas meter, soil pipes or a drain run. We plan bin and bike access, move meters and pipes where needed and check drains early, because these items affect both cost and layout.
How we'd run your project
Visit by arrangement
We agree a visit to your home in East Cowes and any travel costs with you in writing first, then look at the structure, access and boundaries.
Get it approved
Once you're happy with the design we submit it to the council for East Cowes and deal with any questions from the planning officer.
Detail and price
Construction drawings, engineer's calculations and building control sign-off, then a written fixed price for the build.
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 side extensions in East Cowes
Do I need planning permission for a two-storey side extension in East Cowes?
East Cowes is in England, so England planning rules apply. Planning permission is needed: in England, permitted development only allows single-storey extensions to the side. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.
How long does a two-storey side extension take?
Allow 4 to 8 weeks for survey and design, then the approval period (councils should decide householder applications within 8 weeks of validation), then 4 to 8 weeks of technical design, which can overlap. The build itself usually takes 14 to 20 weeks, longer for large or complex designs.
How much does a two-storey side extension cost in East Cowes?
Our guide for South East England, which covers East Cowes, is £2,260–£3,030 per m² including VAT. A typical project with a 3 m × 7 m footprint on two floors (42 m² of new floor space) comes to about £94,500–£127,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Which postcodes do you cover around East Cowes?
We cover East Cowes (PO32) and nearby places including Cowes, Newport (Isle of Wight) and Ryde, plus the rest of the Isle of Wight. Visits and projects in East Cowes are by arrangement, with travel costs agreed in writing first.
Can I build a two-storey side extension over my driveway?
Yes, if the drive is wide enough for a useful room and the council accepts the design. You may lose off-road parking, which some councils weigh up, and the foundations need to suit the ground below. We check parking, drains and meter positions at the site visit before any drawings are prepared.
Nearby
Nearby towns we cover for two-storey side extensions:
Other extensions in East Cowes
- Rear
- Wraparound
- 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 Cowes · Two-storey side extensions across the Isle of Wight
The quickest next step is a visit. We'll look at your house in East Cowes and give you an honest view of the options.