Suspended Timber Floor Insulation
Underfloor Insulation UK – Stop Draughts and Heat Loss
0%APR financeavailable ›
Underfloor Insulation helps UK homeowners improve comfort, reduce draughts, and prevent heat loss through suspended timber floors. LAMTANS Engineering delivers professional retrofit insulation solutions from our Manchester base, helping properties across the UK achieve better thermal performance and energy efficiency.
- TrustMark Registered
- RECC Accredited
- PAS2035 Compliant
- ECO4 Eligible Projects
Floor Check
Do You Have Suspended Timber Floors?
If your home was built before 1960, you likely have suspended timber floors — floorboards laid on top of joists with a void underneath.
Suspended timber floors are common in:
- Victorian and Edwardian properties
- Homes built before 1960
- Properties with air bricks visible on external walls
Without underfloor insulation
Cold air rises through gaps in the floorboards. You feel draughts, rooms take longer to warm up, and heat escapes through the floor.
With underfloor insulation
Draughts stop. Your home stays warmer and more comfortable, and less heat is lost through the floor — helping to reduce your energy costs.
The Benefits
Benefits of Underfloor Insulation
Underfloor insulation provides an effective way to improve the comfort and energy efficiency of homes with suspended timber floors by reducing draughts, preventing heat loss, and creating a warmer indoor environment throughout the year.
Stops Draughts
Prevents cold air entering through gaps in floorboards, making rooms feel warmer and more comfortable.
Lowers Energy Bills
Reduces heat loss through floors, with a typical estimated annual saving of around £100–£200 on energy costs.
Warmer Floors
Takes the chill out of cold floors and improves underfoot comfort, especially during the colder months.
Reduces Condensation
Warmer floor surfaces help minimise moisture build-up and condensation risks in your rooms.
Quick Indicative Payback
The typical investment can be recovered within around 3–5 years through estimated energy savings, depending on your home and usage.
Funding Support May Be Available
Eligible homeowners may receive partial funding towards underfloor insulation through schemes such as ECO4 — a top-up contribution may be required.
Savings and payback figures are typical estimates only and depend on your property, floor area, usage patterns and energy prices.
Check Your ECO4 Grant Eligibility →Indicative Guide Prices
Underfloor Insulation Costs in the UK 2026
Underfloor insulation costs vary depending on the size of the area, floor access and installation requirements. The table below shows indicative guide prices for different room sizes, together with how ECO4 support may affect your cost if you are eligible.
| Room Size | Indicative Cost | With ECO4 Support (If Eligible) |
|---|---|---|
| 15m² (small room) | £500 – £800 | May be fully or partially funded |
| 25m² (medium room) | £800 – £1,200 | May be fully or partially funded |
| 40m² (large room) | £1,200 – £1,800 | May be fully or partially funded |
| Whole ground floor | £2,000 – £3,000 | May be fully or partially funded |
All costs shown are indicative guide prices, not fixed quotes. ECO4 funding is partial in many cases and depends on eligibility — a top-up contribution may be required. Your free survey confirms an accurate written quote and what funding may apply to you.
Check Your ECO4 Grant Eligibility →Step by Step
Our Underfloor Insulation Installation Process
The underfloor insulation installation process involves a careful step-by-step approach, from inspecting the existing floor void and preparing floorboards to fitting insulation, managing moisture, and completing the final finish for long-lasting thermal performance — all delivered to PAS2035 retrofit standards.
Free Survey
We check the void depth, floor condition and ventilation to confirm your home is suitable.
Lift Floorboards Carefully
Boards are lifted and numbered so every one goes back exactly where it came from.
Inspect the Void
We check for damp, pests and services (pipes and cables) before any insulation is fitted.
Install Insulation Between Joists
Mineral wool, PIR boards or sheep's wool fitted snugly between the joists, matched to your floor and budget.
Install Breathable Membrane
A breathable membrane supports the insulation and holds it securely in place between the joists.
Install Vapour Control Layer
A vapour control layer prevents moisture rising into the floor structure. Getting moisture management right at this stage protects your joists and insulation for the long term — it's the step that determines the lasting success of the whole installation.
Replace Floorboards
Boards are refitted in their original positions, then sanded and finished if required.
Suitability Check
Is Your Home Suitable for Underfloor Insulation?
Before installing underfloor insulation, we check your floor type, access, ventilation and existing condition to confirm whether insulation is suitable for your property.
Good for Underfloor Insulation
- Suspended timber floors with accessible floor voids
- Victorian and Edwardian properties
- Visible air bricks for ventilation
- Cold floors and noticeable draughts
- Floorboards and joists in good condition
Not Ideal for Underfloor Insulation
- Solid concrete floors — these require different insulation methods
- No access underneath the floor
- Serious damp or moisture problems
- Damaged joists or unsafe floor structure
- Floors requiring major repairs first
Our honest promise: we assess your property during a free survey and recommend the most suitable insulation solution for your home — if underfloor insulation isn't right for it, we'll tell you and point you to what is.
Trusted Installer
Why Choose LAMTANS for Underfloor Insulation?
We provide professional underfloor insulation services designed for UK homes, combining retrofit expertise, quality materials and compliant installation methods to reduce heat loss, improve comfort and deliver long-term energy efficiency.
PAS2035 Compliant
Insulation installed following recognised retrofit standards for quality, safety and energy efficiency.
TrustMark Registered
Government-endorsed quality assurance for reliable workmanship and customer confidence.
Victorian Property Specialists
We understand the challenges of older UK housing stock, including suspended timber floors and draught issues.
Free, No-Obligation Surveys
An honest assessment of your floor construction, insulation requirements and suitability.
Free Grant Eligibility Checks
We help identify whether you may qualify for partial ECO4 funding support towards your insulation.
Manchester-Based, Nationwide Coverage
Based in Manchester and serving Stockport, Oldham, Droylsden, Ashton-under-Lyne, Tameside and Greater Manchester, with nationwide UK coverage.
Our Credentials
Common Questions
Frequently Asked Questions
How much does underfloor insulation cost?
As an indicative guide: a small room is around £500–£800, a medium room £800–£1,200, and a whole ground floor £2,000–£3,000. These are indicative estimates only — actual costs depend on floor area, access and condition, and your free survey confirms an accurate written quote.
Can I get free underfloor insulation?
Partial funding may be available through schemes such as ECO4 or the Warm Homes Plan if you are eligible. Funding is not guaranteed, and in some cases you may need to pay a top-up contribution. Contact us for a free, no-obligation eligibility check.
Will underfloor insulation stop draughts?
Yes. Floor draughts come from cold air rising through gaps in the floorboards, and underfloor insulation is designed to stop this — making rooms feel noticeably warmer and more comfortable.
Do I need to move out during installation?
No. The work is done room by room, we can work around your furniture, and you can stay in your home throughout. Installation typically takes 1–2 days per room.
How long does underfloor insulation last?
Correctly installed underfloor insulation is designed to last 40+ years with minimal maintenance. Our PAS2035-compliant installation — including proper ventilation and moisture management — is what protects that lifespan.
Is LAMTANS TrustMark registered?
Yes. We are TrustMark Registered, RECC Accredited and PAS2035 Compliant, and we deliver ECO4 eligible projects. You can view our credentials on our accreditations page.
Spread the cost of this work with 0% APR finance
Insulation, solar, heat pumps, boilers, windows and doors, kitchens, bathrooms, extensions and full renovations. Finance available through our partner Ideal4Finance: 0% APR over 3 to 60 months, or 10.9% APR over 120 months. A deposit might be payable, and we will agree this before you begin your application.
Representative example: £5,000 purchase over 5 years with a 25% deposit (£1,250); total credit £3,750; 0% APR fixed; 60 monthly repayments of £62.50; total amount payable £3,750; total interest £0. Finance available subject to status.
Free Survey & Quote
Ready to Insulate Your Floors?
Get your free, no-obligation underfloor insulation quote today — contact LAMTANS Engineering to book your free survey. Not sure if you have suspended timber floors? Book a free consultation and we'll confirm what you have and advise you within 72 hours following your free survey.
Free survey · No obligation · Advice within 72 hours following your free survey
- TrustMark Registered
- RECC Accredited
- PAS2035 Compliant
- ECO4 Eligible Projects