Internal wall insulation · West Sussex
Internal wall insulation in Horsham
Need internal wall insulation in Horsham? Tell us about the property and we'll arrange a free survey and a written quote. We plan internal insulation in Horsham homes room by room so you keep the rest of the house usable.
- Free survey in RH12 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Horsham
Postcode, service and a phone number is all we need.
What the job covers
- Loses roughly 50–100mm per insulated wall
- Needs careful detailing at floor joists, reveals and corners
- Sockets, radiators, skirting and coving are moved and refitted
- Insulated plasterboard, stud wall or breathable systems
What we look for in Horsham
We cover Horsham and nearby Crawley, Horley and Haywards Heath. Horsham sits around 7 miles from Crawley. 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.
Where a property in Horsham is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Postcode district
- RH12
- County or area
- West Sussex
- Nation
- England
- Nearby
- Crawley, Horley, Haywards Heath, Burgess Hill
Planning and building control 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 risks with internal insulation?
Insulating inside makes the masonry colder, so moisture risk rises. Weak points are where floor joists bear into the wall, window reveals and corners. A condensation risk check for the build-up, a continuous vapour control layer where specified, and returning insulation into reveals deal with most of it.
Internal wall insulation prices in Horsham
| 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.
How it works
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 Horsham: questions
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
How much room space will I lose?
Usually 50–100mm on each insulated wall, depending on the system.
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 Horsham?
Yes — we survey and quote internal wall insulation in Horsham (RH12) and nearby Crawley, Horley and Haywards Heath, with a fixed written price before any work starts.