Home extensions in Weymouth
Every type of house extension in Weymouth, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsDT3, DT4
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
What extensions cost in Weymouth
Prices on this page use our South West England factor of ×1.02, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
Planning and building control in Weymouth
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 single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Covering Weymouth and nearby
Site visits are available across Weymouth (DT3, DT4). The same team covers Dorchester (7 miles), Bridport (16 miles), Swanage (22 miles), Poole (22 miles), Wimborne Minster (25 miles), all within easy reach. For homes towards Somerset, Yeovil is around 24 miles away.
Which extension suits a Weymouth home?
In the South West, local stone, render and brick vary from town to town, so matching materials is a big part of designing an extension that looks right.
For many houses here, orangery extensions, annexe extensions or pitched roof extensions gives the most useful space for the budget.
All extension types we build in Weymouth
- Double-storey extensions · from £38,500
- Extensions over a garage · from £24,000
- Building regulations for extensions · from £900
- Side return extensions · from £18,000
- Side extensions · from £22,000
- Home office extensions · from £16,000
- Planning permission for extensions · from £350
- Single-storey rear extensions · from £21,000
- Bedroom extensions · from £26,500
- Flat roof extensions · from £21,000
- Glass box extensions · from £30,500
- Wraparound extensions · from £36,500
- Porch extensions · from £4,050
- Kitchen extensions · from £27,500
- Conservatory replacement extensions · from £20,000
- Extension plans and drawings · from £1,200
- Pitched roof extensions · from £22,500
- Bungalow extensions · from £26,500
- Orangery extensions · from £30,500
- Annexe extensions · from £56,000
- Utility and boot room extensions · from £14,000
- Timber frame extensions · from £21,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Weymouth
How much does an extension cost in Weymouth?
Using our South West England factor (×1.02), a standard-spec single-storey extension of 20 m² is a guide £41,500 to £53,500 including VAT, and a 32 m² two-storey extension £58,500 to £77,000. Your written price follows the survey.
Do I need planning permission for an extension in Weymouth?
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 cover all of Weymouth?
Yes, including the surrounding parts of Dorset. Site visits are free and there is no obligation.
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 Weymouth
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.