Home extensions in Llangefni
More space without moving: we plan and build extensions across Llangefni, with one team for the drawings, the council and the build.
- Postcode districtsLL77
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Where we work near Llangefni
Across LL77, we can visit, measure and advise. Nearby, we also take on projects in Bangor, Gwynedd (8 miles), Caernarfon (10 miles), Holyhead (11 miles). Llandudno, in Clwyd, is roughly 20 miles from Llangefni and also on our list.
Llangefni extension prices at a glance
Prices on this page use our Wales factor of ×0.93, 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) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| 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 |
| Side return extensions | 11 m² | £24,500 – £31,000 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
What works best for Llangefni houses?
Welsh housing ranges from stone terraces in the valleys to render-and-slate houses and modern estates, and the Welsh planning rules differ from England's in several places.
For many houses here, single-storey rear extensions, bungalow extensions or pitched roof extensions gives the most useful space for the budget.
Planning and building control in Llangefni
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).
Extension types and starting prices
- Home office extensions · from £14,500
- Flat roof extensions · from £19,500
- Bedroom extensions · from £24,000
- Conservatory replacement extensions · from £18,500
- Pitched roof extensions · from £20,500
- Extensions over a garage · from £22,000
- Wraparound extensions · from £33,000
- Side return extensions · from £16,500
- Timber frame extensions · from £19,500
- Porch extensions · from £3,700
- Side extensions · from £20,000
- Single-storey rear extensions · from £19,500
- Planning permission for extensions · from £300
- Bungalow extensions · from £24,000
- Orangery extensions · from £27,500
- Utility and boot room extensions · from £13,000
- Building regulations for extensions · from £800
- Kitchen extensions · from £25,000
- Annexe extensions · from £51,000
- Glass box extensions · from £27,500
- Double-storey extensions · from £35,000
- Extension plans and drawings · from £1,100
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
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 Llangefni
How much does an extension cost in Llangefni?
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.
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 Llangefni?
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.
Do you cover all of Llangefni?
Yes, including the surrounding parts of Gwynedd. Site visits are free and there is no obligation.
Book a free site visit in Llangefni
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.