Loft insulation guides
Straight answers about loft insulation: costs, depth, grants, VAT, condensation, spray foam and more. Checked October 2026.
How much does loft insulation cost in 2026?
Guide prices for loft insulation by house type, what changes the price, and the Energy Saving Trust's cost and savings figures.
How deep should loft insulation be?
The recommended depth for loft insulation, how it relates to building regulations, and how to measure what you have.
Is loft insulation worth it?
What loft insulation saves by house type, how quickly it pays back, and when a top-up is or is not worth doing.
Which loft insulation: mineral wool, sheep's wool, blown or boards?
An honest comparison of loft insulation materials: mineral wool rolls, blown loose fill, natural fibres and rigid PIR boards.
How do you board a loft without squashing the insulation?
Why loft boards should sit on raised legs above full-depth insulation, and what a boarded loft can safely hold.
Loft insulation grants in 2026: what is still available?
Which loft insulation funding schemes are open in England, Wales, Scotland and Northern Ireland in October 2026, and how to check.
Why is there condensation in my loft after insulation?
Why a newly insulated loft can show condensation, the usual causes, and the fixes that work.
Spray foam in your loft: problems, mortgages and removal
An honest guide to spray foam insulation: when it causes problems, why lenders worry, how to get an independent inspection and how to avoid removal scams.
Should you insulate your loft yourself?
When DIY loft insulation makes sense, what it involves, and when to use an installer.
Does loft insulation need building regulations approval?
How building regulations apply to loft insulation in England, Wales, Scotland and Northern Ireland.
Is there VAT on loft insulation?
How VAT applies to loft insulation, boarding and related work under HMRC's energy-saving materials rules.
Should you top up or replace old loft insulation?
How to decide whether existing loft insulation can be topped up or should be removed and replaced.
Loft insulation, cables and downlights: what is safe?
How to insulate safely around cables, recessed downlights and transformers in a loft.
How do you prepare a loft for insulation?
A simple checklist for getting your loft and landing ready for installers.
Cold loft or warm loft: where should the insulation go?
The difference between insulating the loft floor and insulating the roof slope, and which suits your home.