Group D · Floors, basements and underfloor heating
Floors over garages and open space
Insulating floors over unheated garages, passages, undercrofts and overhangs.
Priced after survey
Floors over garages and open space
Every job like this is different, so we measure first and give you a fixed written quote. The price depends on:
- The area and access
- What's there now and its condition
- The system and finish you choose
No obligation — your survey confirms what suits and what it costs.
- Best for
- Rooms over garages, flats over shops
- 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
- Priced after survey
What it is
What is floors over garages and open space?
Insulating floors over unheated garages, passages, undercrofts and overhangs.
Best for: Rooms over garages, flats over shops.
Who it suits
Which homes is floors over garages and open space suitable for?
Is my home suitable?
Pick your property type for a straight answer on floors over garages and open space.
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
Insulating floors over unheated garages, passages, undercrofts and overhangs.
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 floors over garages and open space cost?
Priced after survey
Jobs like this vary too much for a fair online price, so we measure first and give you a fixed written quote — with no obligation.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
Floors over garages and open space: your questions answered
Why is the room over my garage cold?
The floor sits over an unheated space and is often uninsulated, so heat escapes downwards and the floor feels cold.
How is a floor over a garage insulated?
From below through the garage ceiling, or from above when floors are lifted, depending on access.
Does it help flats over shops?
Yes — floors over commercial units and passages are a common source of heat loss in flats over shops.
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.
Underfloor heating insulation
Insulation boards under wet or electric UFH so heat goes up, not into the ground.
Basement and cellar insulation
Insulating basement walls and floors with tanking or cavity drain membranes.
Begin your project
Ready to talk about floors over garages and open space?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.