Loft insulation for Caernarfon properties
Our Gwynedd coverage takes in Caernarfon (LL55) and nearby Bangor, Porthmadog and Holyhead. It is about 6 miles south-west of Bangor.
Where a Caernarfon home also has empty cavity walls, we can survey those at the same time. We check ventilation as carefully as insulation in Caernarfon homes, because both matter for keeping a house dry.
On compliance, if cavity wall insulation follows in Caernarfon, filling a cavity is notifiable work under the Building Regulations as they apply in Wales, usually self-certified through a competent person scheme.
Funding in Wales
In Wales, Warm Homes Nest offers free improvements to eligible low-income households, and ECO4 runs to 31 December 2026.
Sources: Welsh Government: warmer and more energy efficient homes (July 2026); GOV.UK: extending the ECO4 end date, government response.
What we check
Existing depth and condition, ventilation at the eaves, water tanks and pipes that need insulating, downlighters that need covers, and storage boarding that needs raising so insulation is not crushed.
What is included in Caernarfon
- Loft hatch draught-proofing
- Mineral wool to the recommended depth
- Depth and ventilation check
- Tank and pipe lagging
Guide prices for Caernarfon
| Loft insulation guide prices | Guide price |
|---|---|
| Loft insulation to 270mm, typical house | £395–£895 |
| Loft top-up from 100mm | £295–£595 |
No VAT is charged on installing insulation in homes until 31 March 2027 (then 5%). Guide ranges only: the fixed price is confirmed in writing before any work starts, and anything that could not be seen at survey is agreed with you first.
How it works in Caernarfon:
Get in touch
Online, by phone or WhatsApp.
Survey visit
We check the space, what is there now and how it is ventilated.
Your quote in writing
A fixed price, with any extras listed separately.
Booked work
Carried out by the installer named on your quote.