40 m²
£550
Book NowLoft Insulation Top Ups
Add 200 mm or 150 mm over existing layers to reach ~270 mm total depth. Clean, quick, and certified.
⚡ Fast install
💰 Lower bills
📈 Better EPC
✅ Knauf materials
Top Ups — 200 mm
Includes: add 200 mm mineral wool, tidy finish, completion certificate.
Top Ups — 150 mm
Includes: add 150 mm mineral wool, full coverage, and completion certificate.
Pay in 4 up to £1,000 (+10% admin fee)
Select your top-up thickness
Current depth: 150 mm
Suggested top-up: 120 mm
Target depth: 270 mm (UK building regulation)
Our top-up process
- 1) Survey & measure — Confirm existing depth and moisture status.
- 2) Prep & safety — Protect wiring, pipes and access points.
- 3) Layer additional insulation — Add 100 / 150 / 200 mm Knauf to reach target depth.
- 4) Certificate & clean-up — Provide proof of 270 mm compliance.
Top-up installations across Yorkshire
York
Leeds
Sheffield
Kingston upon Hull
Bradford
Ripon
Harrogate
Wetherby
Wakefield
Doncaster
Huddersfield
Pickering
Book your top-up survey
Top-up FAQs
Can I top up over damp insulation?
No — existing insulation must be dry and within lifespan. We'll check at survey.
Will a top-up void my warranty?
No — it extends energy efficiency; we provide a completion certificate.
How long does installation take?
Most homes: 2–4 hours depending on size and access.
What thickness is best?
Enough to reach 270 mm total. We recommend 100–200 mm depending on your current depth.