House extensions in Andover
Looking to extend your home in Andover? Start here: extension types, guide prices for Andover, the planning rules that apply and how a project runs.
- Postcode districtsSP10, SP11
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Andover
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).
Choosing the right extension in Andover
In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.
The types we would usually look at first for a home in Andover are double-storey extensions, orangery extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
Andover and surrounding towns
Site visits are available across Andover (SP10, SP11). Neighbouring towns we cover include Winchester (13 miles), Basingstoke (18 miles), Eastleigh (18 miles), Totton (20 miles), Southampton (22 miles). Newbury, in Berkshire, is roughly 15 miles from Andover and also on our list.
Andover extension prices at a glance
Every figure below is a guide for Andover, 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 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
Choose an extension type
- Side return extensions · from £20,000
- Glass box extensions · from £33,500
- Conservatory replacement extensions · from £22,000
- Bungalow extensions · from £29,000
- Single-storey rear extensions · from £23,500
- Orangery extensions · from £33,500
- Porch extensions · from £4,450
- Annexe extensions · from £61,500
- Pitched roof extensions · from £24,500
- Building regulations for extensions · from £1,000
- Timber frame extensions · from £23,500
- Bedroom extensions · from £29,000
- Home office extensions · from £17,500
- Extensions over a garage · from £26,500
- Kitchen extensions · from £30,000
- Utility and boot room extensions · from £15,500
- Side extensions · from £24,500
- Planning permission for extensions · from £350
- Double-storey extensions · from £42,500
- Wraparound extensions · from £40,000
- Flat roof extensions · from £23,500
- Extension plans and drawings · from £1,300
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
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 Andover
How much does an extension cost in Andover?
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.
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.
How long does an extension take in Andover?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Andover, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Andover
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.