House extensions in Blackwood
Every type of house extension in Blackwood, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsCF82, NP12
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Covering Blackwood and nearby
Postcode districts we cover around Blackwood include CF82, NP12. Neighbouring towns we cover include Gelligaer (2 miles), Risca (6 miles), Caerphilly (6 miles), Pontypridd (7 miles), Merthyr Tydfil (9 miles). Pontypool, in Gwent, is roughly 7 miles from Blackwood and also on our list.
Choosing the right extension in Blackwood
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
Start by comparing side return extensions, pitched roof extensions and bungalow extensions: between them they cover most of the layouts we see requested for houses like these.
Approvals for an extension in Blackwood
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 return can fall within permitted development if it stays within the 4 m height limit and the width rules for side extensions. Conservation areas and listed buildings need consent, and the Party Wall Act applies to work on or near a shared wall.
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.
Building regulations approval is separate from planning. Wales has its own building regulations and approved documents; the council or a registered building control approver checks the plans, inspects the work and issues a completion certificate.
Applications are decided by the local planning authority (your county or county borough council, or the national park authority).
Blackwood extension prices at a glance
Every figure below is a guide for Blackwood, adjusted for Wales build costs (×0.93) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
| Kitchen extensions | 20 m² | £39,000 – £49,500 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Orangery extensions | 16 m² | £41,500 – £52,500 |
Choose an extension type
- Side extensions · from £20,000
- Wraparound extensions · from £33,000
- Bungalow extensions · from £24,000
- Pitched roof extensions · from £20,500
- Planning permission for extensions · from £300
- Double-storey extensions · from £35,000
- Annexe extensions · from £51,000
- Porch extensions · from £3,700
- Building regulations for extensions · from £800
- Conservatory replacement extensions · from £18,500
- Side return extensions · from £16,500
- Orangery extensions · from £27,500
- Extension plans and drawings · from £1,100
- Timber frame extensions · from £19,500
- Bedroom extensions · from £24,000
- Flat roof extensions · from £19,500
- Home office extensions · from £14,500
- Single-storey rear extensions · from £19,500
- Extensions over a garage · from £22,000
- Glass box extensions · from £27,500
- Kitchen extensions · from £25,000
- Utility and boot room extensions · from £13,000
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
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
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 Blackwood
How much does an extension cost in Blackwood?
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.
How long does an extension take in Blackwood?
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 Blackwood, and the guide-price tool gives a range for your own size and finish in about a minute.
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.
Book a free site visit in Blackwood
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.