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.

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PAS2030-19 CertifiedTrustMark ApprovedOwn trained team

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, grant-funded efficiency wins

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 frequently one of the quick wins under the Great British Insulation Scheme for eligible homes, and it pairs especially well with draught-proofing for an immediate comfort improvement.

Floor Insulation cost guide

Indicative 2026 pricing for London & the South-East. Every quote is free, fixed and itemised — grants can reduce or remove these figures for eligible households.

Job type	Indicative cost	Notes
Suspended timber floor (from below)	£20 – £40 / m²	Easiest where there's a cellar/crawl space
Suspended timber floor (lifting boards)	£40 – £70 / m²	More labour to lift and refit
Solid floor (rigid board over slab)	£60 – £100 / m²	Usually part of renovation
Typical 3-bed ground floor	£1,800 – £4,500	Often part-funded by grants

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

Mineral wool batts on netting (suspended floors)

Kingspan / Celotex PIR board between or over joists

Breathable membranes to maintain sub-floor ventilation

Rigid floor board for solid-floor build-ups

Draught-proofing to seal gaps around skirtings and boards

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, with grant eligibility checked where relevant.

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.

Grants for floor insulation

We're TrustMark-registered for ECO4 and the Great British Insulation Scheme. If your household qualifies, this work can be fully or partly funded — we handle the application end-to-end.

Check my eligibility

Floor Insulation FAQs

How much does floor insulation cost?

Suspended timber floors cost £20–£70 per m² depending on whether there's sub-floor access; solid floors £60–£100 per m². A typical 3-bed ground floor is £1,800–£4,500, often part-funded under GBIS.

Do you have to lift my floorboards?

Not always. Where there's a cellar or crawl space we insulate from below and leave your floor untouched. Without access, we carefully lift and refit boards to fit insulation between the joists.

Will it stop draughts?

Yes — combining floor insulation with draught-proofing around skirtings and board gaps is one of the most noticeable comfort upgrades, removing the cold air movement you feel at floor level.

Won't blocking the air bricks cause rot?

We never block sub-floor ventilation. The airflow that keeps timber dry is maintained; the insulation sits above it. Correct detailing here is essential and is part of our PAS2030 install.

Can it be done with solid concrete floors?

Yes, by laying rigid insulation board over the slab — but it raises floor level, so it's usually done during a renovation when thresholds and skirtings can be adjusted.

Areas we cover

We install floor insulation across London and the South-East. See all areas we cover →

Wimbledon Kingston upon Thames Hounslow Ruislip

Other insulation services

External Wall Insulation Internal Wall Insulation Loft & Roof Insulation

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