Bungalow extensions in Caernarfon
Our design and build teams take on bungalow extensions in Caernarfon, from the first measured survey through planning and building control to the finished room.
- Guide price in CaernarfonFrom £24,000 inc VAT
- PlanningWelsh permitted development rules (rear up to 4 m)
- Build time10–18 weeks on site
- Postcode districtsLL55
Included in a typical project
- Level thresholds and accessible layouts
- Structural survey before any upward extension
- Planning application where needed
- Single-storey extension options assessed first
- Roof designs that tie into the existing hipped or gable roof
Planning and approvals in Caernarfon
In Wales single-storey bungalow extensions follow the normal limits (up to 4 m at the rear); adding a storey needs planning permission.
The planning position for a specific Caernarfon address depends on its history and any designations, which is why we check it at the first visit.
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.
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).
Extensions in and around Caernarfon
Site visits are available across Caernarfon (LL55). The same team covers Bangor, Gwynedd (7 miles), Llangefni (10 miles), Holyhead (19 miles), all within easy reach.
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
How much does a bungalow extension cost in Caernarfon?
Prices below are for Caernarfon, using the Wales factor of ×0.93. They are guide ranges including VAT for the build only, not a quote.
Typical rates in Caernarfon: £1,630 to £3,160 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 3 m × 5 m 15 m² | £24,000 – £29,500 | £28,500 – £37,000 | £36,000 – £47,500 |
| 4 m × 6 m 24 m² | £39,000 – £47,000 | £45,500 – £59,500 | £58,000 – £76,000 |
| L-shape 35 m² | £56,500 – £68,500 | £66,500 – £86,500 | £84,500 – £111,000 |
Try the guide-price tool to see a range for your own size and finish.
How the project works
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
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 produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Bungalow extension questions answered
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Caernarfon, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Will my neighbours in Caernarfon be involved?
If a planning application is needed, the council notifies neighbours. If the work is on or near a shared boundary, party wall notices may also be needed.
Who do I contract with for a bungalow extension in Caernarfon?
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 much does a bungalow extension cost?
Our guide range for single-storey work is about £1,630 to £3,160 per m² including VAT. Going upwards is priced after a structural survey.
Is it better to extend sideways or upwards?
Sideways and rearwards is usually simpler, cheaper and keeps single-level living. Upwards saves garden but means stairs, more structure and planning permission.
Book a free site visit in Caernarfon
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.