Merthyr Tydfil house extensions
More space without moving: we plan and build extensions across Merthyr Tydfil, with one team for the drawings, the council and the build.
- Postcode districtsCF47, CF48
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Do extensions in Merthyr Tydfil need planning permission?
In Wales a single-storey rear extension can usually project up to 4 m beyond the rear wall without a planning application, if it is no more than 4 m high, keeps eaves to 3 m and overall height to 4 m within 2 m of a boundary, and covers no more than half the land around the original house. Wales has no larger home extension prior approval scheme.
In Wales 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, and it must not come closer to a highway than the existing side wall. Larger side extensions need planning permission.
In a conservation area, national park, National Landscape or 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.
The Party Wall etc. Act 1996 applies in Wales as in England: notice must be served before work to a shared wall, building on the boundary, or excavating close to a neighbour's foundations.
Applications are decided by the local planning authority (your county or county borough council, or the national park authority).
Areas we cover around Merthyr Tydfil
Our survey diary covers Merthyr Tydfil, including CF47, CF48. The same team covers Aberdare (4 miles), Rhondda (7 miles), Gelligaer (8 miles), Blackwood (9 miles), Tonypandy (9 miles), all within easy reach. For homes towards Gwent, Ebbw Vale is around 8 miles away.
Which extension suits a Merthyr Tydfil home?
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
For many houses here, single-storey rear extensions, side return extensions or bungalow extensions gives the most useful space for the budget.
Popular extension prices in Merthyr Tydfil
We publish guide prices so you can budget before anyone visits. For Merthyr Tydfil they are adjusted by ×0.93, the factor we use across Wales.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £41,500 – £52,500 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
Extension types and starting prices
- Bedroom extensions · from £24,000
- Glass box extensions · from £27,500
- Annexe extensions · from £51,000
- Side extensions · from £20,000
- Double-storey extensions · from £35,000
- Extensions over a garage · from £22,000
- Pitched roof extensions · from £20,500
- Home office extensions · from £14,500
- Porch extensions · from £3,700
- Side return extensions · from £16,500
- Single-storey rear extensions · from £19,500
- Utility and boot room extensions · from £13,000
- Bungalow extensions · from £24,000
- Flat roof extensions · from £19,500
- Extension plans and drawings · from £1,100
- Orangery extensions · from £27,500
- Planning permission for extensions · from £300
- Timber frame extensions · from £19,500
- Kitchen extensions · from £25,000
- Conservatory replacement extensions · from £18,500
- Wraparound extensions · from £33,000
- Building regulations for extensions · from £800
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
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
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 Merthyr Tydfil
How much does an extension cost in Merthyr Tydfil?
Using our Wales factor (×0.93), a standard-spec single-storey extension of 20 m² is a guide £38,000 to £48,500 including VAT, and a 32 m² two-storey extension £53,500 to £70,000. Your written price follows the survey.
Will my neighbours need to be told?
If you apply for planning the council notifies them, and in Wales party wall notices may be needed for work near a shared boundary.
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 Merthyr Tydfil?
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.
Book a free site visit in Merthyr Tydfil
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.