Internal wall insulation · West Sussex
Internal wall insulation in Crawley
Need internal wall insulation in Crawley? Tell us about the property and we'll arrange a free survey and a written quote. Where a property in Crawley is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Free survey in RH11 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Crawley
Postcode, service and a phone number is all we need.
Part of every quote
- Loses roughly 50–100mm per insulated wall
- Insulated plasterboard, stud wall or breathable systems
- Can be done one room at a time during a renovation
- Needs careful detailing at floor joists, reveals and corners
Before we quote in Crawley
We cover Crawley and nearby Horley, Horsham and East Grinstead. Homes across the South East range from inter-war semis and post-war estates, which are mostly cavity-walled, to older solid-walled cottages and Victorian town terraces.
Exposure to wind-driven rain varies across West Sussex: sheltered town streets fare better than walls on high ground or facing the prevailing weather, and the render, beads and cill details are chosen with that in mind.
We plan internal insulation in Crawley homes room by room so you keep the rest of the house usable.
- Postcode district
- RH11
- County or area
- West Sussex
- Nation
- England
- Nearby
- Horley, Horsham, East Grinstead, Reigate
Approvals in England
Internal insulation rarely needs planning permission, but in England and Wales insulating or replastering more than half of a wall's area involves building control, and listed buildings need consent for internal changes that affect their character.
What are the options for internal insulation?
- Insulated plasterboard — PIR or phenolic foam bonded to plasterboard, fixed to the wall and skimmed. Thinnest option.
- Insulated stud wall — a timber or metal frame filled with insulation, with a vapour control layer and plasterboard. Takes more space but runs services easily.
- Wood fibre and lime — breathable boards finished in lime plaster, for older walls that need to manage moisture.
Internal wall insulation prices in Crawley
| Item | Guide price | Notes |
|---|---|---|
| Insulated plasterboard, supplied and skimmed | £75–£110 per m²0% VAT | |
| Insulated stud wall | £90–£130 per m²0% VAT | |
| Typical bedroom, one external wall | £1,795–£2,9950% VAT | Including making good |
Confirmed by a fixed written quote after survey. 0% VAT: installing insulation in a home is zero-rated until 31 March 2027, so these figures are the total; 5% applies from 1 April 2027.
What happens next
Tell us about the property
Use the quote tool or form, or call. Photos help.
Free survey
We measure, check the walls and confirm approvals.
Fixed written quote
System, details, access, exclusions and VAT in writing.
Installation
Scheduled for suitable weather, with a clear programme.
Internal wall insulation in Crawley: questions
What happens to my radiators and sockets?
They're taken off and refitted on the new wall face. Electrical work is done by a qualified electrician.
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
Is internal insulation cheaper than external?
Per m² usually yes, but the cost of moving fittings and redecorating narrows the gap on whole-house jobs.
Do you cover Crawley?
Yes — we survey and quote internal wall insulation in Crawley (RH11) and nearby Horley, Horsham and East Grinstead, with a fixed written price before any work starts.