Group D · Floors, basements and underfloor heating
Solid floor insulation
PIR or XPS boards over the slab with a new screed or floating floor.
Typical price
Solid floor insulation
£60–£110 per m²
Solid floor insulation with new screed
Ask for a quoteBefore grants · updated 11 October 2026 · a survey confirms the final figure.
- Best for
- Renovations, extensions, ground-floor flats
- Guarantee or standard
- Part L
- Time on site
- A suspended floor is typically done room by room over a few days; working from the void below can be quicker where access allows.
- Typical price
- £60–£110 per m²
What it is
What is solid floor insulation?
PIR or XPS boards over the slab with a new screed or floating floor.
Best for: Renovations, extensions, ground-floor flats.
Build-up
Insulated solid floor
Room
Ground
- 1Floor finish
- 2New screed or floating floor
- 3PIR or XPS boards
- 4Damp-proof membrane
- 5Concrete slab
Who it suits
Which homes is solid floor insulation suitable for?
Is my home suitable?
Pick your property type for a straight answer on solid floor 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
- Park and mobile home
Flats and blocks of flats
Commercial and public buildings
Usually suitable Depends — a survey confirms
Materials and brands
What we use
PIR or XPS boards over the slab with a new screed or floating floor.
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 solid floor insulation cost?
| Service | Typical range, installed |
|---|---|
| Solid floor insulation with new screed | £60–£110 per m² |
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
A suspended floor is typically done room by room over a few days; working from the void below can be quicker where access allows.
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
Part L. 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
Solid floor insulation: your questions answered
How much does solid floor insulation cost?
Typically £60–£110 per m² for solid floor insulation with new screed, installed in London and the South East, including VAT and before any grant. Prices updated 11 October 2026. A survey confirms your final figure.
How do you insulate a solid concrete floor?
Rigid PIR or XPS boards are laid over the slab, with a new screed or floating floor on top.
Will insulating a solid floor raise the floor level?
Yes, so doors, skirtings and thresholds need adjusting. That's why solid floor insulation is usually done during a renovation or extension.
Can I have underfloor heating at the same time?
Yes — insulating under a new screed is the ideal base for underfloor heating.
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.
Insulated floor screed
Insulation plus screed, ready for underfloor heating.
Underfloor heating insulation
Insulation boards under wet or electric UFH so heat goes up, not into the ground.
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 solid floor insulation?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.