Asbestos cement barn roofs and solar: the 2026 UK guide

Asbestos cement was the dominant agricultural roof cladding from the 1950s through to the late 1980s — robust, cheap, fire-resistant, and (it turned out) a long-term liability that today blocks rooftop solar PV on a significant share of the UK’s farm-building stock. The good news in 2026: the combined re-roof and PV business case is well-established, HSE-licensed contractors operate routinely in every UK region, and the maths usually works.

The regulatory position

The Control of Asbestos Regulations 2012 (CAR 2012) prohibits any drilling, fixing, or load-imposing work on asbestos cement cladding. There is no derogation for solar PV. Any rooftop PV install on a building with asbestos cement cladding must follow one of two paths: (1) strip-and-reclad, removing the asbestos under licensed conditions and installing new cladding before any PV work; or (2) total roof replacement as part of the PV project. Either way, only HSE-licensed contractors can carry out the removal work, and an Asbestos Removal Notification (typically 14 days) must be lodged with HSE before work starts.

What it costs

In 2026, HSE-licensed asbestos cement removal costs typically £30–£50 per square metre depending on the building size, access complexity, and disposal route. Replacement profiled steel cladding adds £45–£80 per square metre installed. So a 2,000 sqm asbestos-clad barn roof typically costs £75,000–£130,000 to strip and re-clad before any PV work. PV install on top adds the standard £750–£1,000 per kW.

The combined business case: a 200 kW PV install on the new roof generates around 180,000 kWh per year, saving £40,000+ annually for a farm with strong daytime self-consumption. Over the 25-year system life, this typically pays for the entire re-roof and PV cost with a 6–9 year overall payback. The farm gets a modern, watertight, structurally improved roof AND a renewable energy asset for a single capital outlay.

When NOT to combine

There are situations where re-roof and PV should be sequenced rather than combined: (1) the building’s structural frame is also compromised — frame replacement is a different scope of work entirely; (2) the building’s use is changing and the future use doesn’t suit PV (residential conversion, demolition); (3) the building is small enough that the re-roof economics don’t stack alongside PV; (4) the operator has very limited capital and is making the re-roof a priority but cannot fund PV alongside.

Picking an HSE-licensed contractor

HSE publishes the current asbestos licence holders register. Look for: licence currency (not expired or revoked), recent track record on agricultural buildings specifically (not just commercial/industrial), insurance cover at the appropriate level, and willingness to coordinate with the PV installer on shared scaffolding and access. The best combined projects use a single principal contractor coordinating the asbestos team, the cladding installer, and the PV team under one programme.

Planning and grants

Permitted development under Class A Part 14 GPDO 2015 typically covers the re-cladding (replacement of like for like, no change of use) AND the rooftop PV. No planning permission is normally required unless the building is listed or in a designated landscape area. The 100% Annual Investment Allowance applies to the PV portion of the capex (plant and machinery) but typically not the re-roof (building fabric) — talk to your accountant about how to apportion the bill of materials and labour for tax purposes. SFI 2025 has no direct asbestos-related action, but the agrivoltaic and biodiversity bundles can stack on the same farm.

Our typical project

We’ve delivered combined re-roof and PV projects across the UK since 2019. Typical project: 1,500–3,000 sqm of asbestos cement, removed in 4–8 weeks, re-clad in profiled Plastisol-coated steel, with 150–400 kW of PV installed in the following 2–4 weeks. Total project duration from contract to commissioning: 4–7 months. Single mobilisation saves £20,000–£50,000 versus sequenced delivery on multi-building projects.

If you’re planning a roof replacement on an asbestos-clad farm building, factor PV into the decision from day one — the combined business case is almost always stronger than re-roof alone.