Underfloor insulation for Llanelli properties
If your property is in Llanelli or the SA15 district or nearby Ammanford and Carmarthen, it is within our Dyfed coverage. It is around 14 miles south-east of Carmarthen.
In Llanelli homes this is often done on the same visit as a cavity fill, which saves a second trip. Where a Llanelli home also has empty cavity walls, we can survey those at the same time.
In terms of approvals, if cavity wall insulation follows in Llanelli, 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.
Keeping the void ventilated
Air bricks under a suspended floor must stay clear so the timbers stay dry. Insulation goes between the joists, not across the void, and gaps at skirtings are sealed to stop draughts.
What is included in Llanelli
- Floor void inspection
- Insulation between joists
- Boards relaid
- Draught sealing at skirtings
Guide prices for Llanelli
| Underfloor insulation guide prices | Guide price |
|---|---|
| Suspended timber floor, typical room | £795–£1,495 |
| Whole ground floor | £1,995–£3,995 |
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.
The steps for underfloor insulation in Llanelli:
Tell us about the property
Postcode, property type and what you would like done.
Free survey
Access, condition, existing insulation and ventilation checked.
Written result and price
What we recommend and a fixed price before any work.
Work and tidy-up
Fitted at an agreed time, with ventilation kept clear.