How should you assess solar PV fire safety on a commercial roof?

Assess your roof and proposed solar array together before installation. The Building Safety Regulator’s roof research was updated in February 2026 and identifies interactions between panels, roof materials and firefighting access [S1]. Request a documented design review, an updated premises fire risk assessment and clear isolation information. Checked October 2026.

Last checked 17 October 2026

What does solar PV fire risk mean for your commercial roof?

Solar photovoltaic (PV) panels convert light into electricity. For your site, fire review should cover the electrical installation and the roof beneath it. The Building Safety Regulator’s research examines how rooftop arrays can change heat exposure and firefighting conditions; its publication applies to England [S1].

Use that research to frame design questions. Do not treat it as a national approval certificate for a particular panel, mounting system or roof membrane. The publication explicitly distinguishes the authors’ findings from government policy [S1]. Ask your designer to identify the rules and guidance relevant to your nation and premises.

Start with the roof suitability guide. A survey should inform the proposal before you compare how many panels each supplier can fit. Ask who will coordinate the roof, electrical and fire reviews, and include that work in the quotation.

What should a solar PV fire risk assessment cover?

In the workplace framework described by GOV.UK, the responsible person must carry out and regularly review a fire risk assessment and retain a written record [S3]. Commission a competent assessor where the work is beyond your expertise. For Scotland or Northern Ireland, ask the assessor to identify the applicable local framework.

Give the assessor the proposed design before installation and the final drawings after commissioning. Suggested project questions include how the array affects existing roof features, where people can reach isolation equipment and how staff would report a fault. Request actions with named owners so unresolved items do not disappear between contractors.

Treat this table as a briefing aid. Your assessor should explain which issues matter for your premises and which further evidence is needed. Avoid accepting a generic checklist with your company name added at the top.

How do roof materials and panel layout affect fire safety?

The regulator’s literature review identifies roof construction, panel geometry, spacing and the gap beneath panels as relevant to fire behaviour [S2]. That supports asking for an assessment of the combined arrangement. A panel certificate alone does not describe the existing roof assembly at your building.

Ask the designer to mark roof lights, smoke vents, compartment boundaries and existing plant on the proposed layout. Request an explanation of how the design deals with each feature. If an item has been omitted because the roof has not been surveyed, keep it on the project action list.

Have the roofing contractor review the proposed fixings or ballast before accepting the layout. Request the basis for any effect on the roof warranty in writing. If a roof replacement is likely during the intended project term, ask for a removal and reinstatement allowance alongside the installation price.

Our flat roof solar guide can help structure those questions. Do not accept a universal clearance distance from a sales diagram without the designer explaining its basis for your roof, access arrangements and fire strategy.

What labels and isolation information should you request?

Ask for a labelled site plan showing the array, cable routes, inverters and isolation equipment. An inverter converts the panels’ direct current into alternating current used by the building. Have the electrical designer specify the warning labels and operating instructions for your installation.

The research highlights continuing electrical hazards after power disconnection [S2]. Staff therefore need instructions specific to the installed equipment. Ask the commissioning team to demonstrate the agreed actions and clearly identify anything staff should leave to trained personnel.

Keep emergency information where the agreed response plan says it can be found. Check that the drawing identifies the building and roof area clearly, especially on an estate with similar units. Record who updates it after changes to the installation. A document stored only in a former employee’s inbox is difficult to use.

How should you plan inspections and roof access?

HSE identifies roof lights and other roof materials as potentially fragile and says precautions are needed when working on or near them [S4]. Include access planning in both installation and maintenance procurement. Ask how a contractor would reach an inverter, replace a panel or investigate a cable fault.

Request a maintenance schedule identifying the inspection scope, reporting route and response to defects. Have the installer explain which activities require electrical isolation and which need specialist roof access. Agree how tenants or facilities contractors will be told about work affecting their building.

For your own site records, retain photographs taken at handover, test documentation and a list of equipment locations. Ask contractors to record later alterations against the same drawing set. Use the solar maintenance guide to prepare the service specification.

What should you agree with your insurer and landlord?

Send the proposed layout and technical review to your insurer before signing. Ask which documents it wants, whether it expects further assessment and how to record approval. Do the same with your landlord if you do not own the roof. Do not treat silence as an agreed change to cover or property rights.

If a funder will own the array, ask who pays for inspections, roof repairs, emergency attendance and removal. Have your solicitor review access and end-of-term terms. Keep any battery proposal in the same site review; our battery fire safety guide sets out separate questions to raise.

What should you do next?

Gather the roof survey, existing fire assessment and proposed layout, then get matched with an installer that covers your area. State whether your insurer or landlord has requested additional evidence.

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