Group A · Loft and roof insulation
Loft conversion insulation
The full insulation package a new loft conversion needs to meet Part L.
Priced after survey
Loft conversion insulation
Every job like this is different, so we measure first and give you a fixed written quote. The price depends on:
- The area and access
- What's there now and its condition
- The system and finish you choose
No obligation — your survey confirms what suits and what it costs.
- Best for
- Loft conversion projects (with LINX Design & Build)
- Guarantee or standard
- Building control sign-off
- Time on site
- Programmed with the loft conversion build.
- Typical price
- Priced after survey
What it is
What is loft conversion insulation?
The full insulation package a new loft conversion needs to meet Part L.
Best for: Loft conversion projects (with LINX Design & Build).
Build-up
Room-in-roof slope
Outside
Attic room
- 1Roof covering and membrane
- 2Ventilated gap
- 3PIR boards between the rafters
- 4Insulated plasterboard
Who it suits
Which homes is loft conversion insulation suitable for?
Is my home suitable?
Pick your property type for a straight answer on loft conversion insulation.
Guidance only — every home is different, and a survey confirms what suits yours.
Houses
- Detached house
- Semi-detached house
- End-of-terrace
- Mid-terrace
- Townhouse
- Mews house and cottage
- Detached bungalow
- Semi and terraced bungalow
- Chalet and dormer bungalow
- Period home
- 1930s home
- Post-war and ex-council house
- Non-traditional / system-built
- Listed building or conservation area
- Farmhouse, barn conversion or rural home
- New build or self-build
Flats and blocks of flats
Commercial and public buildings
Usually suitable Depends — a survey confirms
Not usually suitable for 4 property types
- Park and mobile home — Park and mobile homes need specialist systems, which we arrange through a partner rather than standard measures.
- Low-rise block — Loft conversion insulation is for houses and top-floor flats, not whole blocks.
- Mid-rise block — Loft conversion insulation is for houses and top-floor flats, not whole blocks.
- High-rise block — Loft conversion insulation is for houses and top-floor flats, not whole blocks.
Materials and brands
What we use
Full insulation package for new loft conversions to meet Part L: rafters, dormers, floor, party walls, Velux reveals.
Insulation brands we work with
- Knauf Insulation (Earthwool, Supafil blown)
- Rockwool
- Superglass
- Isover
- Kingspan
- Celotex
- Recticel
- Xtratherm
- Steico wood-fibre
- YBS and Actis multifoil
The exact system and brand for your home are confirmed in your written quote.
Heat, bills and EPC
What it does for your heat loss, bills and EPC
Heat rises, so a poorly insulated roof is often the largest single route out for heat. Insulating it lowers the roof's U-value — how easily heat passes through — so the heating runs less and the EPC rating usually improves. The gain is largest where there's little insulation now; topping up a loft that's already reasonably insulated gains less.
See the EPC points and savings for your home in the EPC plannerU-value before and after, typical heat and bill saving, and EPC points — worked out for your property.Price
How much does loft conversion insulation cost?
Priced after survey
Jobs like this vary too much for a fair online price, so we measure first and give you a fixed written quote — with no obligation.VAT on this work
Insulation installed in homes in Great Britain is zero-rated for VAT until 31 March 2027. Other parts of a job like this — such as a new roof covering, structural work or waterproofing — may be standard-rated. Your quote shows the split.What to expect
Time on site, disruption and approvals
Time on site
Programmed with the loft conversion build.
Disruption
Part of the conversion works.
Planning and building control
Part of a loft conversion signed off by building control. Planning depends on the conversion design — some dormers need permission.
Guarantee and standard
Building control sign-off. The guarantee and certification for your job are confirmed in writing in your quote.
60-second grant check
Could a grant help pay for it?
Grant eligibility checker
About 60 seconds · plain results: likely, possibly or not eligible
Before we start
What type of property is it?
Questions
Loft conversion insulation: your questions answered
What insulation does a loft conversion need?
Insulation to the rafters, dormer roofs and cheeks, the floor, party walls and around roof window reveals, all designed to meet Building Regulations Part L and signed off by building control.
Can you do just the insulation on my loft conversion?
Yes. We work with your builder on the insulation package, or deliver the conversion with LINX Design & Build.
Why do roof window reveals matter?
The linings around Velux-type roof windows are a common cold spot and condensation point. Insulating the reveals keeps them warm and dry.
Group A
More in loft and roof insulation
Loft insulation
Mineral wool laid between and across the joists to 270–300 mm so heat stays in the rooms below.
Loft insulation top-up
An extra cross-layer over existing insulation to reach the recommended 270 mm or more.
Blown loft insulation
Loose-fill insulation blown into awkward, shallow or low-headroom lofts that rolls can't reach.
Loft clearance and replacement
Old, damp or damaged insulation removed, the loft cleaned, then new mineral wool fitted.
Raised loft boarding and storage
Loft legs or raised boarding over full-depth insulation, so storage doesn't crush it.
Insulated loft hatch and ladders
An insulated, draught-sealed hatch and loft ladder — a small add-on that stops a big leak.
Begin your project
Ready to talk about loft conversion insulation?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.