Penarth house extensions
Every type of house extension in Penarth, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsCF64
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
What works best for Penarth houses?
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
Depending on the plot, bungalow extensions and side return extensions are often the strongest options, with single-storey rear extensions worth considering where there is room.
Penarth extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Penarth they are adjusted by ×0.93, the factor we use across Wales.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Side return extensions | 11 m² | £24,500 – £31,000 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Kitchen extensions | 20 m² | £39,000 – £49,500 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Orangery extensions | 16 m² | £41,500 – £52,500 |
Do extensions in Penarth 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.
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).
Every extension type in Penarth
- Orangery extensions · from £27,500
- Bedroom extensions · from £24,000
- Extension plans and drawings · from £1,100
- Kitchen extensions · from £25,000
- Conservatory replacement extensions · from £18,500
- Annexe extensions · from £51,000
- Extensions over a garage · from £22,000
- Timber frame extensions · from £19,500
- Porch extensions · from £3,700
- Side return extensions · from £16,500
- Bungalow extensions · from £24,000
- Wraparound extensions · from £33,000
- Planning permission for extensions · from £300
- Building regulations for extensions · from £800
- Home office extensions · from £14,500
- Utility and boot room extensions · from £13,000
- Side extensions · from £20,000
- Pitched roof extensions · from £20,500
- Double-storey extensions · from £35,000
- Flat roof extensions · from £19,500
- Single-storey rear extensions · from £19,500
- Glass box extensions · from £27,500
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Penarth
How much does an extension cost in Penarth?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Penarth, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in Penarth?
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 Penarth
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.