Room-in-roof insulation in Llantwit Major
Llantwit Major is part of the area we cover in South Glamorgan. For room-in-roof insulation, you get a free survey and a fixed written quote.
We cover the CF61 postcode districts, which fall under Vale of Glamorgan council.

Where we work around Llantwit Major
Llantwit Major sits about 14 miles from Cardiff, measured in a straight line.
We also cover Cowbridge, Barry, Penarth and Cardiff.
| Postcode districts | CF61 |
|---|---|
| Council area | Vale of Glamorgan |
| County or area | South Glamorgan |
What is room-in-roof insulation?
Most rooms-in-roof are reached by stripping the existing plasterboard on the slopes, fitting insulation between and over the rafters, and re-boarding. Dormer cheeks and roofs are included where they can be reached. More about room-in-roof insulation.
- Eaves voids insulated where accessible
- Insulation to slopes, knee walls and flat ceiling
- Boarding and finishing as agreed on the quote
Why book with us in Llantwit Major
Tidy work
Dust sheets on the route in and every bit of packaging taken away.
Clear contact details
Your quote says who to call with questions before, during and after the work.
No pressure selling
You get everything in writing and decide in your own time.
Photos of the finished loft
You see the work done without climbing the ladder.
How much does room-in-roof insulation cost in Llantwit Major?
Part of this work can be zero-rated as energy-saving materials until 31 March 2027, and part is standard-rated. If VAT applies, your quote shows which is which.
Building regulations in Wales
Wales has its own Approved Document L. Insulation alone is not normally notified, but conversions need building control. How the rules work across the UK.
Questions about room-in-roof insulation in Llantwit Major
Is loft work in Llantwit Major different from anywhere else?
The method is the same, but older terraces, cottages and newer estates each have their own quirks: lath ceilings, low pitches or trussed roofs. We plan for the loft we find.
How do I pay for work in Llantwit Major?
Payment terms are set out on your quote. We never ask for payment on the doorstep or in cash.
Can a landlord in Llantwit Major book work for a tenanted house?
Yes. We can arrange access with the tenant directly and send you photos once the work is finished.
Can it be done without removing the plasterboard?
Sometimes the flat ceiling and eaves voids can be reached from behind. The slopes almost always need the boards off to insulate them properly.
How long does room-in-roof insulation take?
Usually three to six working days for one room, depending on how much is stripped and how it is finished.
