Insulation cost for a bungalow UK 2026 depends on your roof type and wall construction
If you own a bungalow, you are likely losing a significant amount of heat through the roof and walls. Energy Saving Trust data shows a detached bungalow loses approximately 25% of its heat through the roof and 35% through the walls (Energy Saving Trust, 2026). The total insulation cost for a bungalow in the UK in 2026 ranges from around £500 for a basic DIY loft job to over £20,000 for full solid-wall insulation.
Loft insulation for a standard 80m² bungalow costs between £500 and £1,200 if you install mineral wool yourself. Professional installation using spray foam or rigid board costs between £1,500 and £3,000 (Energy Saving Trust, 2026). Solid-wall insulation for a 100m² bungalow typically costs £10,000 to £20,000 for external or internal systems, while cavity-wall insulation averages £2,000 to £4,000 (DESNZ, 2026). Underfloor insulation for a suspended timber floor costs £1,500 to £3,000, and for a solid concrete floor it costs £2,500 to £5,000 (Energy Saving Trust, 2026).
Quick numbers – insulation cost per square metre for a bungalow
The table below shows typical costs per square metre for each insulation type on a bungalow. These figures are based on published UK industry averages for 2026.
| Insulation type | Cost per m² (low) | Cost per m² (high) | Typical bungalow area (m²) | Total cost range |
|---|---|---|---|---|
| Loft (mineral wool) | £6 | £15 | 80 | £500–£1,200 |
| Loft (spray foam) | £19 | £38 | 80 | £1,500–£3,000 |
| Cavity wall | £20 | £40 | 100 | £2,000–£4,000 |
| Solid wall (external) | £100 | £200 | 100 | £10,000–£20,000 |
| Solid wall (internal) | £80 | £150 | 100 | £8,000–£15,000 |
| Suspended floor (timber) | £30 | £60 | 50 | £1,500–£3,000 |
| Solid floor (concrete) | £50 | £100 | 50 | £2,500–£5,000 |
Sources: Energy Saving Trust, 2026; DESNZ, 2026.
Annual savings on heating bills from bungalow insulation
Insulating a bungalow can cut heating bills significantly. The savings depend on the current level of insulation, the fuel type, and the size of your bungalow.
Adding loft insulation from 0mm to 270mm saves a detached bungalow £180 to £300 per year (Energy Saving Trust, 2026). Cavity-wall insulation saves £250 to £400 per year for a gas-heated bungalow (Energy Saving Trust, 2026). Solid-wall insulation saves £400 to £700 per year, depending on wall area and fuel type (Energy Saving Trust, 2026). Underfloor insulation saves £100 to £200 per year for a bungalow with a suspended floor (Energy Saving Trust, 2026).
Payback period – how long until insulation pays for itself on a bungalow
The payback period is the time it takes for energy savings to match the upfront cost. This varies by insulation type and installation method.
DIY loft insulation using mineral wool pays back in 2 to 5 years. Professional spray foam loft insulation takes 8 to 15 years to pay back (Energy Saving Trust, 2026). Cavity-wall insulation pays back in 5 to 10 years (Energy Saving Trust, 2026). Solid-wall insulation has a payback of 15 to 30 years, but it also adds value and comfort to the property (Energy Saving Trust, 2026). Underfloor insulation pays back in 8 to 15 years for a suspended floor, and longer for a solid concrete floor (Energy Saving Trust, 2026).
These payback periods assume current fuel prices and no grant support. With a grant, the payback can become immediate or very short.
Grants and financial support for bungalow insulation in 2026
Several government schemes can reduce or eliminate the cost of insulating a bungalow in 2026. Eligibility depends on household income, property EPC rating, and whether the property is on the gas grid.
The Great British Insulation Scheme (GBIS) offers fully funded or heavily subsidised loft and cavity-wall insulation for low-income households and those with EPC bands D to G (GOV.UK, 2026). The Energy Company Obligation (ECO4) provides free insulation for qualifying homeowners and private tenants who receive certain benefits (GOV.UK, 2026). The Home Upgrade Grant Phase 2 (HUG2) covers solid-wall and underfloor insulation for off-gas-grid bungalows in England (GOV.UK, 2026).
To apply, contact your energy supplier first. They can tell you if you qualify for GBIS or ECO4. For HUG2, you need to contact your local authority.
What is the total insulation cost for a bungalow UK 2026
For a typical 100m² detached bungalow, insulating the loft, cavity walls, and suspended floor costs £4,000 to £8,000 using professional installers (Energy Saving Trust, 2026). If the bungalow has solid walls rather than cavity walls, adding solid-wall insulation raises the total to £14,000 to £28,000 (DESNZ, 2026).
Annual savings from a full insulation package range from £530 to £1,400 (Energy Saving Trust, 2026). The payback period for a full package is 10 to 20 years, depending on fuel costs and whether you qualify for a grant (Energy Saving Trust, 2026). If you receive full grant funding, the payback is immediate.
how to check your bungalow wall type before insulating
How to verify your bungalow insulation installer
Using a certified installer protects your investment and ensures the work meets building regulations. For cavity-wall and loft insulation, use an installer registered with the National Insulation Association (NIA) and certified under TrustMark (GOV.UK, 2026). Solid-wall insulation, whether external or internal, must be installed by a company certified under the BBA or KIWA and registered with TrustMark (Energy Saving Trust, 2026).
Spray foam roof insulation requires an MCS-certified installer if you intend to apply for future grants or incentives (MCS, 2026). Underfloor insulation for suspended floors should be installed by a Gas Safe Register engineer if it involves gas pipework, or a TrustMark-registered general builder (Gas Safe Register, 2026).
Always check an installer’s certification before agreeing to work. You can search for TrustMark-registered tradespeople on the GOV.UK website.
bungalow-specific EPC improvement costs and savings
Frequently Asked Questions
Loft insulation for a standard 80m² bungalow costs between £500 and £1,200 for DIY mineral wool, or £1,500 to £3,000 for professional spray foam or rigid board, according to the Energy Saving Trust (2026).
Cavity wall insulation for a typical 100m² bungalow costs between £2,000 and £4,000, based on DESNZ data for 2026.
Solid wall insulation for a 100m² bungalow costs £10,000 to £20,000 for external systems or £8,000 to £15,000 for internal systems, per Energy Saving Trust figures for 2026.
Underfloor insulation for a 50m² bungalow costs £1,500 to £3,000 for a suspended timber floor or £2,500 to £5,000 for a solid concrete floor, according to the Energy Saving Trust (2026).
Annual savings vary by insulation type and fuel, but the Energy Saving Trust reports that insulating a detached bungalow can save hundreds of pounds per year on heating bills, depending on the current level of insulation.
