Building services in Caernarfon
House extensions
- Single-storey extensions
- Double-storey extensions
- Side extensions
- Side return extensions
- Wraparound extensions
- Kitchen extensions
- Orangeries
- Glazed and contemporary extensions
- Porches
Loft conversions
- Dormer loft conversions
- Hip-to-gable loft conversions
- Mansard loft conversions
- Rooflight loft conversions
- Bungalow loft conversions
Garage, basement and barn conversions
New build homes
Renovations and structural work
Design and approvals
Guide prices in Caernarfon
| Project | Guide range (inc VAT) |
|---|---|
| Double-storey extensions | £1,500–£2,300 per m² of floor area (both floors) |
| Kitchen extensions | £2,050–£3,150 per m² including a mid-range kitchen |
| Hip-to-gable loft conversions | £50,500–£72,000 for a hip-to-gable with rear dormer |
| Structural alterations and knock-throughs | £4,250–£8,750 for a typical knock-through with steel beam |
| Porches | £6,000–£14,500 from a 3 m² porch to a small front extension |
| Orangeries | £2,200–£3,150 per m² of floor area |
Prices across Wales are typically 8% below the UK average for this kind of work, which is reflected in the range for Caernarfon.
Planning permission in Caernarfon
In Wales a single-storey rear extension is often permitted development: up to 4 metres beyond the rear wall and up to 4 metres high, with eaves no higher than 3 metres within 2 metres of a boundary and no more than half the land around the original house covered. Wales has no larger home extension prior approval route, so deeper extensions need a planning application, as do extensions to flats, listed buildings and houses whose rights have been removed.
Building regulations in Wales are set by the Welsh Government. Approval comes from the council’s building control service or a registered building control approver, with inspections during the work and a completion certificate at the end.
About building in Caernarfon
Terraced houses in Welsh towns often have narrow plots, which suits rear and side return extensions and rear dormers.
Our Caernarfon coverage includes postcode districts LL55, and we also work in nearby places such as Bangor, Holyhead and Llandudno. Caernarfon has a population of around 10,000.
How it works
- 01
Survey and brief
We visit, discuss your ideas and budget, and survey the property or site at no cost.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals in place
We handle planning, building control and neighbour notices before work starts.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions from homeowners in Caernarfon
Do I need planning permission for an extension in Caernarfon?
In Wales a single-storey rear extension is often permitted development: up to 4 metres beyond the rear wall and up to 4 metres high, with eaves no higher than 3 metres within 2 metres of a boundary and no more than half the land around the original house covered. Wales has no larger home extension prior approval route, so deeper extensions need a planning application, as do extensions to flats, listed buildings and houses whose rights have been removed.
Do you work in Caernarfon?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Caernarfon, including postcodes LL55.
How much does a loft conversion cost in Caernarfon?
A rear dormer loft conversion in Caernarfon typically costs £44,000–£62,500 for a typical rear dormer with en-suite, including VAT.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
How much does an extension cost in Caernarfon?
A single-storey extension in Caernarfon typically costs £1,800–£2,650 per m² of floor area, and a double-storey extension £1,500–£2,300 per m² of floor area (both floors), including VAT.