House extensions in Gosport
From a small utility to a two-storey addition, we take on house extensions throughout Gosport, starting with a free visit and a planning check.
- Postcode districtsPO1, PO2, PO4, PO5, PO12, PO13
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Gosport home?
In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.
For many houses here, double-storey extensions, wraparound extensions or single-storey rear extensions gives the most useful space for the budget.
Guide prices for Gosport
Every figure below is a guide for Gosport, 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) |
|---|---|---|
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
Covering Gosport and nearby
Site visits are available across Gosport (PO1, PO2, PO4, PO5, PO12, PO13). Nearby, we also take on projects in Portsmouth (2 miles), Fareham (4 miles), Waterlooville (7 miles), Havant (8 miles), Hythe (13 miles). Ryde, in Isle of Wight, is roughly 5 miles from Gosport and also on our list.
Planning rules in Gosport
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 two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
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).
All extension types we build in Gosport
- Extension plans and drawings · from £1,300
- Home office extensions · from £17,500
- Flat roof extensions · from £23,500
- Single-storey rear extensions · from £23,500
- Orangery extensions · from £33,500
- Conservatory replacement extensions · from £22,000
- Side return extensions · from £20,000
- Double-storey extensions · from £42,500
- Planning permission for extensions · from £350
- Pitched roof extensions · from £24,500
- Porch extensions · from £4,450
- Utility and boot room extensions · from £15,500
- Bedroom extensions · from £29,000
- Timber frame extensions · from £23,500
- Kitchen extensions · from £30,000
- Wraparound extensions · from £40,000
- Annexe extensions · from £61,500
- Bungalow extensions · from £29,000
- Side extensions · from £24,500
- Extensions over a garage · from £26,500
- Glass box extensions · from £33,500
- Building regulations for extensions · from £1,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Gosport
How much does an extension cost in Gosport?
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.
Do I need planning permission for an extension in Gosport?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
How long does an extension take in Gosport?
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.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Book a free site visit in Gosport
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.