Room-in-roof insulation in South Glamorgan
Homes and buildings across South Glamorgan can book room-in-roof insulation, starting with a free survey and a fixed written quote.
Towns we cover include Cardiff, Barry, Penarth, Cowbridge and Llantwit Major.

Where we work around South Glamorgan
We work across the Cardiff and Vale of Glamorgan council areas.
Postcode areas: CF.
| Councils | Cardiff and Vale of Glamorgan |
|---|---|
| Postcode areas | CF |
| Towns listed | 6 |
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. The room will need redecorating. More about room-in-roof insulation.
- Insulation to slopes, knee walls and flat ceiling
- Boarding and finishing as agreed on the quote
- Eaves voids insulated where accessible
Why book with us in South Glamorgan
Photos of the finished loft
You see the work done without climbing the ladder.
Plain-English advice
We explain what we find in plain English, and say so when nothing needs doing.
Tidy work
Dust sheets on the route in and every bit of packaging taken away.
Fixed written price
The price on the quote is the price you pay. It only changes if you change the job, or if we find something hidden, such as rot, and you agree the change in writing first.
How much does room-in-roof insulation cost in South Glamorgan?
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 South Glamorgan
Are your prices the same across South Glamorgan?
Yes. Our guide prices are the same everywhere we work, and they include normal travel. Your fixed price depends on your loft, not your postcode.
Can you quote for several properties in South Glamorgan?
Yes. Landlords and agents can send a list of addresses and we will survey them in as few visits as we can.
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.
Will the room get smaller?
Slightly. Insulated plasterboard over the rafters takes a few centimetres off each slope.
