London & South-East England
Floor Insulation
Floor insulation tackles the heat loss and cold draughts that come up through the ground floor — something most homeowners only notice in winter, when bare feet and chilly rooms give it away. In older homes with suspended timber floors, the gap beneath the boards is ventilated to the outside air, so an uninsulated floor is effectively losing heat to the wind under your house.
Is Floor right for your home?
- Pre-1950s homes with suspended timber ground floors
- Rooms with persistent cold draughts at skirting level
- Properties with an accessible cellar or crawl space (easiest install)
- Renovations where floors are coming up anyway
- Homes chasing quick, low-cost efficiency wins
Floor Insulation: key facts
- Best for pre-1950s homes with suspended timber ground floors.
- Stops the cold draughts you feel at skirting level in winter.
- Suspended timber: £70–£110/m²; solid floor: £80–£120/m².
- A typical 3-bed ground floor runs £2,500–£6,000.
- Sub-floor ventilation is always maintained — no rot risk when done correctly.
- Pairs especially well with draught-proofing; PAS2030-19 certified.
What is floor insulation?
There are two main scenarios. Suspended timber floors are insulated from below (in a cellar or via a crawl space) or from above by lifting boards, fitting mineral wool or rigid board between the joists on netting or battens. Solid concrete floors are insulated with rigid board above the slab, usually as part of wider renovation because it affects floor heights and door thresholds.
We are PAS2030-19 and TrustMark certified. Floor insulation is one of the quicker, lower-cost comfort wins in an older home, and it pairs especially well with draught-proofing for an immediate improvement.
Floor Insulation cost guide
Indicative 2026 pricing for London & the South-East, based on hundreds of real quotes and 500+ completed installations — not generic industry averages. Every quote is free, fixed and itemised, with no hidden extras.
| Job type | Indicative cost |
|---|---|
| Suspended timber floor (from below) | £60 – £90 / m² |
| Suspended timber floor (lifting boards) | £70 – £110 / m² |
| Solid floor (rigid board over slab) | £80 – £120 / m² |
| Typical 3-bed ground floor | £2,500 – £6,000 |
What real jobs actually cost
Anonymised prices from recent jobs our own team won and installed across London and the South-East. Every home differs — your fixed, itemised quote follows a free survey.
| When | Area | Work | Size | Price |
|---|---|---|---|---|
| February 2024 | Camberwell (SE5) | Suspended floor insulation | — | £1,250 |
Prices are real totals paid for the specific scope of each job (access, condition and finishes vary) — use them as honest reference points, not like-for-like quotes. Full cost guide
Recent Floor work
Real jobs completed by our own team across London and the South-East.
Suspended Floor Insulation
Mineral Wool in Dulwich
Systems & materials we install
How Floor installation works
Free survey
We check floor type, sub-floor access and ventilation, and confirm whether to insulate from above or below.
Quote
A fixed written quote within 24 hours, itemised by labour and materials.
Installation
Insulation fitted between or below joists with ventilation maintained, or rigid board laid over a solid slab; floors reinstated cleanly.
Sign-off & guarantee
Final inspection, TrustMark paperwork and written guarantee.
Free survey & fixed quote
Book a free, no-obligation survey and we'll send a clear, fixed written quote within 24 hours — PAS2030-19 certified and TrustMark registered, with all work installed by our own trained team.
Get a free quoteFloor Insulation FAQs
How much does floor insulation cost?
Do you have to lift my floorboards?
Will it stop draughts?
Won't blocking the air bricks cause rot?
Can it be done with solid concrete floors?
Areas we cover
We install floor insulation across London and the South-East. See all areas we cover →
Other insulation services
Related guides
In-depth, independent guidance to help you decide.
Last reviewed June 2026 by Stay Warm Insulation.
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