Natural loft insulation | From £995

What is sheep's wool or natural loft insulation?

Sheep's wool and wood fibre are vapour-open and can take up and release moisture. In an older house with lime plaster ceilings that helps keep the build-up breathable. They are also pleasant to handle. The trade-off is cost: natural materials usually cost two to three times as much as mineral wool for the same performance.

Is it right for your loft?

Period houses with lath-and-plaster or lime ceilings
Homes where you want to avoid itchy mineral fibres
Owners who prefer renewable or recycled materials
Lofts where moisture management matters

How we do it

We check the ceiling below for weak plaster before anyone kneels on the joists.
We confirm the depth needed for the product chosen, as natural materials differ.
The first layer fills each bay, the second runs across the joists.
Eaves ventilation is kept open and any services are protected.

What is included

Sheep's wool or wood fibre to the agreed performance
Crawl boards so weak ceilings are not loaded
Eaves kept clear

Worth knowing

Natural insulation is not automatically better. In a modern house with plasterboard ceilings and a felted roof, mineral wool does the same job for much less. We will tell you which we would choose for your loft.

How much does sheep's wool or natural loft insulation cost?

£995 to £1,495Terraced house, average loft, sheep's wool. Free survey and a fixed written quote before any work.

Installing insulation in a home is zero-rated for VAT until 31 March 2027 and 5% after that, under HMRC's rules for energy-saving materials (notice 708/6).

Work out a guide price for your loft or see every price.

Do the rules differ across the UK?

Yes, a little. Building regulations and funding schemes are set separately in each nation. Here is the short version; each area page has the detail.

Nation	Building rules	Funding to check
England	Approved Document L; insulation alone is not usually notified	ECO4 to 31 Dec 2026; Warm Homes Plan and Warm Homes: Local Grant
Wales	Welsh Approved Document L; conversions need building control	Warm Homes Nest; ECO4 to 31 Dec 2026
Scotland	No building warrant normally needed; standards still apply	Home Energy Scotland grant and loan; Warmer Homes Scotland
Northern Ireland	NI Building Regulations (Technical Booklet F1); check with council building control	Affordable Warmth Scheme; NISEP

Questions about sheep's wool or natural loft insulation

Is sheep's wool insulation worth the extra cost?

In an older breathable house, or if you care about the material, often yes. In a modern semi with plasterboard ceilings the extra cost buys little performance.

Do moths eat sheep's wool insulation?

Insulation-grade sheep's wool is treated against insects. We use products sold for loft insulation, not raw fleece.

How deep does natural insulation need to be?

It depends on the product's thermal conductivity. Some need slightly more depth than mineral wool to reach the same U-value, which we allow for on the quote.

Where we provide sheep's wool or natural loft insulation

Wales

Scotland

Northern Ireland

Often booked with it

Which loft insulation: mineral wool, sheep's wool, blown or boards?

Sources, checked October 2026: Energy Saving Trust: roof and loft insulation; Which?: loft insulation costs and savings; LABC: building regulation requirements for loft insulation; GOV.UK: extending the ECO4 end date, government response.

Sheep's wool and natural loft insulation