What is the Average Floor Insulation Cost in 2020? | Checkatrade
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Floor insulation cost guide
by
Checkatrade

As the seasons change, a well-insulated floor can make all the difference in keeping your home cosy in winter. By cutting down on draughts at ground level, you can also reduce your annual energy bills. Sound good? Get a head start before the cold snap kicks in and use our search bar to find a professional. Alternatively, read on for a complete overview of the average floor insulation cost in the UK.

We’ve gathered prices for labour and materials from our network of professional tradespeople to help you budget for the job. Got a question or want further advice from our experts? Leave a comment and we’ll get back to you ASAP.

What is under floor insulation?

Ground floors or floors built above unheated spaces can get cold quickly.  This is especially true in older properties that rely on suspended floors to prevent damp. In turn, energy bills will inevitably increase as you crank the heating to fight off the draught. Underfloor insulation tackles this exact problem.

If you have suspended timber floors and the budget available, it’s worth raising the floorboards and laying mineral wool insulation supported by netting or wooden battens. You can also opt for foam spray insulation or foam boards to keep the draught from rising up. Although relatively simple, this process requires the expertise of a specialist to ensure it is laid correctly. 

What is the cost of floor insulation?

Cost provided itemPrice - Range LowPrice - Range HighAverage UK Cost
Suspended floor insulation£770£1,000£885
Suspended timber floor insulation£300£750£525
Solid floor insulation£950£2,200£1,550

The average under floor insulation cost starts at £770 for a smaller room and up to £1000 for larger rooms. Naturally, costs will vary depending on the size of the room and type of floor. As far as home improvement jobs go, this one is relatively reasonable when it comes to pricing. Although an upfront investment is required, the floor insulation cost pays for itself within 2-3 years.

Suspended floor insulation cost

Suspended floors are designed for enhanced ventilation to prevent the build-up of damp under your floor.  Although effective, this can cause cold air to rise up between your floorboards. In the winter months, this will thwart your efforts to keep your home heated. To keep your home warm, you can either:

  • Remove the floorboards and relay with insulating materials, or 
  • Insulate under the floor using the crawl space underneath.

In any case, it’s best to use a specialist to avoid damaging the floorboards themselves.

The total floor insulation cost will have two elements – the cost of materials and the cost of installation. As a guide, the average cost for suspended floor insulation is £885.

Suspended timber floor insulation cost

To insulate a suspended timber floor, you place insulation between the timber joists and under the floorboards. The average suspended timber floor insulation cost will typically fall in the region of £300 – £750, depending on factors including location, type of company and size of the room.

suspended floor insulation costIt’s essential not to cover the ventilation grills as they are critical in preventing damp from damaging timber flooring. 

Solid floor insulation cost

Many new build homes will come with solid floor bases constructed from concrete or screed directly below a room. Although solid floors will lose less heat than suspended timber flooring, they are still prone to cold.

Adding a layer of rigid insulation above this can be a great way to keep your floors from feeling icy cold in the winter.

This will then be covered by chipboard and finished with your chosen floor covering. Solid floor insulation costs anywhere between £950 – £2,200, depending on the size of your floor and the company you use.

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Key benefits of floor insulation

  • suspended timber floor insulation costReduce your fuel bills – According to the Energy Saving Trust, adding floor insulation saves homeowners £60 a year in energy bills.
  • Cut your carbon emissions – Fully insulating your floor will help to retain heat in your home, bringing heating usage down and reducing the number of carbon emissions produced.
  • Keep your feet warm – You can retain around 15% more heat in your home adding insulating materials under the floorboards. This is especially important for homeowners with children and/or pets.
  • Regulate the temperature – Under floor heating keeps your home cool in the summer and warm in the winter.
  • Reduce damp – Wood floors are vulnerable to moisture build up. A layer of insulation can create a vapour barrier that prevents damp from damaging the wood floor.

Floor insulation materials

The following materials are commonly used as underfloor insulation solutions:

Blanket

Blanket insulation is made from unfaced glass mineral wool. It is lightweight, flexible and offers reliable thermal and acoustic insulation. Ideal for use with floors with timber joists, wool roll insulation is highly resilient and fire-resistant. If you wish to buy the roll and attempt installing the underlay yourself, you can expect to pay around £20 per roll sized 14m2.

Rock mineral wool

Rockwool slabs are ideal for lightweight framed buildings and best for use in floating floor treatments. They are a versatile product used for thermal, acoustic and fire insulation. As well as under floor insulation, you can use stone wool slabs for acoustic ceilings and partition panels. The typical price of a pack of rock wool slabs is approximately £30 for a 12-pack covering 9m2.

cost of floor insulationFoamboard

Foam board is an all-rounder product that can be used as insulation throughout the home. This makes it ideal for homeowners seeking to insulate their entire home including walls or flat roofs. They are made from foam and faced with materials such as paper, plasterboard or foil. The thicker the board, the better the insulation. The average price of foam board is £10-£15 per m2 depending on the thickness.

Foam spray insulation

Spray foam insulation is another common solution for insulating the underside of suspended timber flooring. This product provides exceptional thermal insulation and helps reduce draughts to make your home more energy-efficient. Keep in mind that foam spray gives off harmful fumes during installation. Hiring a professional is essential as they have the protective equipment and understanding of where to lay the product. Prices of application will cost an average of £525.

Floor insulation checklist

  • The average floor insulation cost in the UK is approximately £900 depending on the floor type.
  • Prices in London will inevitably be higher to reflect demand.
  • When raising floorboards, it’s a good time to check the condition of the joists before insulation. Any rot should be dealt with before insulation is added.
  • If you aren’t certain on the best material, ask a specialist for advice on the best solution.

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