Under Floor Insulation

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Underfloor Insulation

Underfloor insulation is an effective way to keep your home warmer and reduce energy bills by eliminating cold draughts. The right type of insulation depends on your flooring — whether it’s suspended timber, concrete, or another type. We’ll guide you through the options so you can choose the best solution for your home.

 

You may be eligible for government grants to help cover the cost of installation, making it even easier to upgrade your insulation.

Save on your energy costs

Insulating your floor can save you up to £100 a year on your energy bills

Create a cosier home

Underfloor insulation will help eliminate cold and draughty floors

Sustainability

Reduce the the amount of CO2 you produce each year by 310kg

What is underfloor insulation?

Underfloor insulation is a smart and cost-effective solution designed to keep your home cosy while helping to reduce your energy consumption. Depending on the type of flooring you have, you can install underfloor insulation either with mineral wool or spray foam beneath your home’s floorboards, or with rigid foam boards over a solid concrete floor. These types of insulation act as a thermal barrier, preventing heat loss and creating a more comfortable living environment. 

How can I tell what type of flooring I have?

If you have airbricks on the outside of your home below the inside floor line, this will indicate you have suspended flooring. The airbricks are vital for airflow to prevent moisture buildup in the suspended area, helping to protect the wooden framework. Another good indication of a suspended floor is if you have a chimney and a bay window. If you have a relatively new home and none of those things are present, you most likely have a solid concrete floor.

Types of underfloor insulation

Depending on what type of floor you have, this will dictate what type of insulation you need. Here are some insulation examples that could be used in your home. You will also need to comply with building regulations; if you are having the insulation professionally installed, this should be arranged by your installer.

Solid concrete floor insulation

Rigid foam boards

  • Can be fitted either above or below the concrete
  • You can only add it below if you’re replacing your existing solid concrete floor
  • If you are installing above your floor, you will also need to add a layer of chipboard flooring over the insulation
  • This will raise the overall height of your floor, so you’ll need to move skirting boards, electric sockets, and trim your doors to make room for the insulation

 

 

Suspended floor insulation

Spray foam

    • Used on either suspended concrete or floorboards
    • Installed by cutting edge robot technology
    • Foam is spayed in layers on the underside of your flooring
    • A small access hatch is needed to allow the robot access, providing little disruption for installation

    Wool mineral insulation

      • Used on suspended floorboards
      • All of your floorboards will need to be lifted for this type of insulation to be installed

      Improve your EPC rating

      Installing underfloor insulation is not only a great way to improve your home’s energy efficiency, but it also has the added benefit of increasing its Energy Performance Certificate (EPC). The lower your rating, the cheaper it is to heat and light your home. Plus, there is the added benefit that if you decide to sell your home, you’ll have a better rating for those savvy buyers looking for a more sustainable home.

      Is this the right service for you?

      What is underfloor insulation and how does it work?

      Underfloor insulation is a method of reducing heat loss by adding insulating materials beneath the floorboards or between joists. It works by trapping heat inside your home, preventing it from escaping through the floor — especially in properties with suspended timber floors.

      What types of floors can be insulated?

      Suspended timber floors are ideal for underfloor insulation, as there’s usually a crawl space or void beneath them. Solid concrete floors can’t be insulated in the same way underneath but can be insulated on top using rigid insulation boards before new flooring is laid.

      What are the benefits of underfloor insulation?

      • Reduces heat loss and lowers energy bills

      • Improves overall comfort by reducing draughts and cold spots

      • Can reduce noise from below

      • Increases your home’s energy efficiency rating (EPC)

      Is underfloor insulation worth the cost?

      Yes — particularly in older homes with uninsulated timber floors. While costs vary depending on the size and type of property, many homeowners recover the investment over time through reduced heating bills and improved home comfort.

      Can I install underfloor insulation myself?

      If your home has accessible crawl space and you’re confident in DIY, you might be able to install it yourself using materials like mineral wool or foil-faced insulation. However, for best results (and safety), professional installation is recommended — especially to avoid disrupting plumbing, wiring, or ventilation.

      Our Services

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      1. Site Survey & Assessment

      • On-site inspection to assess floor type, accessibility, and insulation needs

      • Thermal imaging (if applicable) to identify heat loss areas

      • Detailed quote and recommendation report

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      2. Suspended Floor Insulation Installation

      • Professional fitting of insulation materials (e.g., mineral wool, PIR boards, foil-backed rolls)

      • Suitable for timber floors with crawl space or access from below

      • Includes air-tightness and draught-proofing as needed

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      3. Solid Floor Insulation

      • Application of rigid foam insulation boards over concrete floors

      • Can include floor screeding or boarding for a ready-to-finish surface

      • Ideal for renovations, extensions, or retrofits

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      4. Retrofit Underfloor Insulation

      • Insulation upgrades for older or poorly insulated homes

      • Removal of outdated or damaged insulation

      • Careful installation to preserve existing flooring and ventilation

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      5. Draught Proofing & Ventilation Solutions

      • Sealing gaps around floorboards, skirting, and pipework

      • Maintaining necessary airflow to prevent damp or mould

      • Optional installation of controlled ventilation systems

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      6. Insulation for Suspended Ceilings or Raised Floors
      • Thermal and acoustic insulation solutions for raised floors (e.g., in offices or commercial spaces)
      • Insulation for exposed ceilings in basements or garages
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        7. Ongoing Maintenance & Inspection

        • Annual or scheduled inspections for insulation performance

        • Checking for sagging, moisture, or pest-related damage

        • Repairs and top-ups as needed

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