What Insulation Does GBIS Cover?

Explore the types of insulation measures available through the Great British Insulation Scheme, including loft, cavity wall, solid wall, and underfloor insulation.

GBIS Insulation Measures

1. Loft Insulation

GBIS covers loft insulation up to 300mm depth. This is one of the most cost-effective energy-saving measures.

  • Typical cost without grant: £600-£1,200
  • Potential savings: £200-£400/year on heating bills
  • Installation time: 1 day

2. Cavity Wall Insulation

For properties built between 1920-1990 with cavity walls. Insulation is injected into the gap between walls.

  • Typical cost without grant: £1,000-£2,000
  • Potential savings: £300-£500/year
  • Installation time: 1-2 days

3. Solid Wall Insulation

For older properties (pre-1920) with solid walls. Available as internal or external wall insulation.

  • Internal: Insulation boards fixed to interior walls
  • External: Insulation layer added to exterior walls
  • Typical cost without grant: £8,000-£15,000
  • Potential savings: £400-£700/year
  • Installation time: 2-5 days

4. Underfloor Insulation

For properties with suspended floors or accessible underfloor spaces.

  • Typical cost without grant: £800-£1,500
  • Potential savings: £100-£200/year
  • Installation time: 1-2 days

5. Room-in-Roof Insulation

For converted loft spaces or rooms with sloped ceilings.

  • Typical cost without grant: £1,500-£3,000
  • Potential savings: £150-£300/year
  • Installation time: 1-3 days

6. Park Home Insulation

GBIS also covers insulation for park homes (mobile homes on residential parks).

  • Underfloor insulation
  • Wall insulation
  • Roof insulation

What GBIS Does NOT Cover

  • Boiler upgrades or replacements
  • Heating system improvements
  • Heat pumps or renewable heating
  • Solar panels or solar thermal
  • Windows or doors
  • Ventilation systems

Note: If you need heating improvements, check if you qualify for ECO4 or the Boiler Upgrade Scheme instead.

How Much Does GBIS Pay For?

The amount GBIS covers depends on your circumstances:

If You're on Benefits

100% funded — no contribution required

If You're Not on Benefits

Small contribution required (typically £100-£500 depending on measures)

Check Your GBIS Eligibility

Find out which insulation measures you qualify for through GBIS

Check GBIS Eligibility