Group D · Floors, basements and underfloor heating
Underfloor heating insulation
Insulation boards under wet or electric UFH so heat goes up, not into the ground.
Typical price
Underfloor heating insulation
£15–£35 per m²
Underfloor heating insulation boards (laid with UFH) — extra
Ask for a quoteBefore grants · updated 11 October 2026 · a survey confirms the final figure.
- Best for
- Every UFH install (add-on)
- Guarantee or standard
- UFH manufacturer spec
- Time on site
- Laid as part of the underfloor heating installation.
- Typical price
- £15–£35 per m²
What it is
What is underfloor heating insulation?
Insulation boards under wet or electric UFH so heat goes up, not into the ground.
Best for: Every UFH install (add-on).
Build-up
Underfloor heating build-up
Room
Ground or room below
- 1Floor finish
- 2Screed with underfloor heating pipes
- 3Insulation boards — heat goes up, not down
- 4Slab or subfloor
Who it suits
Which homes is underfloor heating insulation suitable for?
Is my home suitable?
Pick your property type for a straight answer on underfloor heating 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 1 property type
- Park and mobile home — Park and mobile homes need specialist systems, which we arrange through a partner rather than standard measures.
Materials and brands
What we use
Insulation boards under wet or electric UFH so heat goes up, not into the ground; essential with heat pumps.
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
Suspended timber floors lose heat through the boards and let cold air in through the gaps; solid floors conduct heat into the ground. Insulating the floor and sealing the gaps lowers the floor's U-value and cuts draughts, so rooms feel warmer at the same thermostat setting, and the EPC usually improves.
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 underfloor heating insulation cost?
| Service | Typical range, installed |
|---|---|
| Underfloor heating insulation boards (laid with UFH) | £15–£35 per m²extra |
Indicative ranges for London and the South East, supplied and installed, including VAT. Updated 11 October 2026. A survey confirms your final price.
0% VAT on energy-saving materials
Insulation, solar panels, batteries and heat pumps installed in homes in Great Britain are zero-rated for VAT until 31 March 2027. Windows and doors are not included.What to expect
Time on site, disruption and approvals
Time on site
Laid as part of the underfloor heating installation.
Disruption
Lifting floorboards means clearing the room and taking up carpets or flooring. Working from the void below avoids this.
Planning and building control
No planning permission is needed. Underfloor ventilation must be kept clear, and new or renovated floors must meet Building Regulations Part L.
Guarantee and standard
UFH manufacturer spec. 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
Underfloor heating insulation: your questions answered
How much does underfloor heating insulation cost?
Typically £15–£35 per m² (extra) for underfloor heating insulation boards (laid with ufh), installed in London and the South East, including VAT and before any grant. Prices updated 11 October 2026. A survey confirms your final figure.
Why insulate under underfloor heating?
Without insulation, much of the heat goes down into the ground or the room below instead of up into the room. Insulation boards help the system respond faster and cost less to run.
Is UFH insulation essential with a heat pump?
Yes. Heat pumps run at lower flow temperatures, so losing heat downwards matters even more.
Can you add insulation to my UFH install?
Yes — the boards are laid as part of the underfloor heating installation.
Group D
More in floors, basements and underfloor heating
Suspended timber floor insulation
Mineral wool or rigid board between the joists with an airtight membrane.
Underfloor insulation from the void
Insulation fitted from below through a crawl space, without lifting floorboards.
Solid floor insulation
PIR or XPS boards over the slab with a new screed or floating floor.
Insulated floor screed
Insulation plus screed, ready for underfloor heating.
Floors over garages and open space
Insulating floors over unheated garages, passages, undercrofts and overhangs.
Basement and cellar insulation
Insulating basement walls and floors with tanking or cavity drain membranes.
Begin your project
Ready to talk about underfloor heating insulation?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.