Loft Insulation Replacement Cost After Spray Foam Removal
The standard specification
270mm of mineral wool laid at ceiling joist level is the default UK specification. This meets current Building Regulations Part L for retrofit insulation and is accepted by every lender as standard.
Cost by property type — mineral wool
Mid-terrace homes typically cost £400–£600 for full mineral wool replacement. Semi-detached £500–£900. Detached £700–£1,200. Bungalows with larger footprints £800–£1,400. Prices include materials, installation, and basic eaves vent restoration.
Cost by material — relative pricing
Mineral wool is the baseline (1×). Sheep's wool runs 2.5–3× mineral wool. Wood fibre boards run 3–5×. PIR boards between rafters with battening run 4–6×. Hemp and recycled cotton 2.5–3×.
Boarding the loft floor
If you want to retain loft storage, raised loft legs above the new insulation cost £300–£800 for materials and £200–£600 for installation depending on area. This avoids compressing the insulation and breaking the U-value.
Eaves vent restoration
Many post-removal projects include reinstating soffit or fascia vents. Allow £150–£400 typically, though if external scaffolding is required this can rise.
Combined removal-plus-insulation packages
Many UK specialists offer the removal and replacement insulation as a single package, which can save 5–10% versus commissioning the insulation separately afterwards. The single contractor also makes warranty claims simpler.
Building Regulations sign-off
Loft insulation up to 300mm at joist level is typically a notifiable but straightforward Building Control matter. Reputable installers handle the paperwork as part of the quote.
Grant funding
ECO4 and the Great British Insulation Scheme can fund replacement insulation for qualifying households. Eligibility depends on income, benefits and EPC rating. A reputable installer will check whether your project qualifies before invoicing.
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