Floor Insulation — Seal the Heat Escaping Beneath Your Feet

Cold floors are not just uncomfortable — they are a sign that heat is escaping downwards. Floor insulation tackles this hidden source of energy waste.

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£85

Potential annual savings

Typical cost: £500 – £1,500

While lofts and walls rightly get the most attention, ground floors account for around 10% of heat loss in an uninsulated home. With energy prices at their current levels — electricity at 24.67p/kWh and gas at 6.76p/kWh — even modest savings add up. Floor insulation is particularly valuable in older properties with suspended timber floors, where cold air can circulate freely beneath the floorboards, creating draughts and cold spots that force your heating system to work harder.

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Potential annual saving

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Typical installation cost

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Average payback period

Heat loss prevented

What Is Floor?

Floor insulation involves fitting insulating material beneath or within the ground floor of your home to reduce heat loss downward. For suspended timber floors, mineral wool or rigid foam boards are fitted between the joists from below (if there is a cellar or crawl space) or from above by lifting floorboards. For solid concrete floors, rigid insulation boards can be laid on top with a new floor finish, though this raises the floor level slightly.

How It Works

Floor Assessment

A surveyor identifies your floor type (suspended timber or solid concrete) and assesses access, condition, and the most suitable insulation approach.

Preparation

For suspended floors, the underfloor area is cleared and checked for damp, ventilation, and any pipework. For solid floors, the existing surface is prepared.

Installation

Insulation material is fitted between joists (suspended floors) or laid over the slab (solid floors). Gaps and edges are sealed to prevent air leakage.

Floor Finishing

Floorboards are re-laid or a new floor finish is applied. The result is a warmer, draught-free floor surface.

Is It Right for My Home?

Floor insulation is suitable for most ground-floor properties. It is most cost-effective in homes with suspended timber floors, where insulation can be fitted between the joists. Homes with accessible cellars or crawl spaces are particularly easy to insulate from below. Solid concrete floors can also be insulated, but the work is more disruptive as it involves raising the floor level. Upper-floor flats generally do not need floor insulation.

Key Benefits

Warmer Floors

Eliminate cold floors and create a noticeably more comfortable living environment, especially in ground-floor rooms.

Reduce Draughts

Sealing gaps in suspended timber floors stops cold air from rising through floorboards, reducing draughts throughout the room.

Lower Energy Bills

Save up to £85 per year by preventing heat from escaping through the ground floor of your home.

Reduced Noise

Floor insulation also acts as a sound barrier, reducing noise transfer between floors in multi-storey homes.

Prevent Damp

Insulating suspended timber floors can help reduce moisture rising from the ground, protecting your floorboards and joists.

Complement Other Measures

Floor insulation works best alongside loft and wall insulation, helping to create a fully insulated thermal envelope for your home.

Cost Breakdown

Our partner network means you'll typically pay less than these averages.

Property Type	Typical Cost	Annual Saving	Payback
Detached	£1,000 – £1,500	£85	12–18 years
Semi-Detached	£700 – £1,100	£60	12–18 years
Terraced	£500 – £800	£45	11–18 years
Bungalow	£800 – £1,200	£70	11–17 years

Government Grants Available

ECO4

Floor insulation is an eligible measure under ECO4 for qualifying low-income households. The scheme can cover the full cost of installation.

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Warm Homes Plan

The Warm Homes Plan may fund floor insulation as part of a package of energy efficiency measures for eligible homes.