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Commercial air conditioning regulations: the UK checklist

Updated 23 October 2026 · SEO Dons Editorial

What are the legal duties at a glance?

DutyRule behind itDetail
F-gas certification of company and engineersGB F-gas rulesF-gas certificate check
Leak checks, records and refrigerant recoveryGB F-gas rulesF-gas regulations explained
Energy inspection of systems over 12 kWEnergy Performance of Buildings Regulations 2012TM44 inspections
Building work, ventilation and commissioningBuilding Regulations 2010, Parts L and FPart L changes, Part F guide
Product efficiencyEcodesign regulationsBelow
Planning permissionTown and Country Planning Act 1990Planning guide
Plant noisePlanning conditions, Environmental Protection Act 1990Noise guide
Workplace temperature and ventilationWorkplace Regulations 1992Workplace temperature law
Legionella, where water is involvedHSE guidanceLegionella guide
Electrical work, refrigerant safety, project dutiesBS 7671, BS EN 378, CDM 2015Electrical supply
Decommissioning and wasteF-gas recovery, waste duty of careBelow

Who can legally install commercial air conditioning?

For the refrigerant side, a company certified by an approved body, using engineers who hold their own F-gas qualifications. GOV.UK says a company must be certified to install, repair, maintain and decommission, and that it is against the law to work with F gas without the correct certification. Individuals need their own qualifications even when employed. A category 2 certificate covers installing systems with less than 3 kg of F gas, or less than 6 kg if hermetically sealed, and category 1 covers all activities.

For the electrics, the Electricity at Work Regulations 1989 require anyone doing work that needs technical knowledge to have it or be suitably supervised, and HSE says work on installations below 1000 volts AC should follow BS 7671. Approved Document P, which covers electrical notification, is a dwellings document, so it is not the route for an office or warehouse.

Which refrigerant duties apply?

The user of the equipment, not just the contractor, carries leak-check duties. GOV.UK lists stationary air-conditioning equipment among the equipment users must have checked, and says that for rented equipment the rental agreement may shift the duty. A leak must be repaired as soon as possible and the test repeated within a month. Records must be kept for five years for equipment holding 5 tonnes of CO2 equivalent or more. These rules cover Great Britain; GOV.UK notes that Northern Ireland sits in the EU system. The frequency bands are in the F-gas explainer, and routine checks usually sit inside a commercial air conditioning service contract. Changes to refrigerant supply are tracked in the GB F-gas changes guide.

Which energy and building rules apply?

Energy inspection. In England and Wales, systems with an effective rated output of more than 12kW must be inspected by an energy assessor at intervals of no more than five years. Scotland and Northern Ireland have separate requirements. The TM44 guide covers the process.

Building Regulations. Fixed systems for air conditioning are fixed building services, and providing a controlled service counts as building work. Where Part L applies, the person doing the work must give the building control authority a notice confirming commissioning to an approved procedure. Approved Document L (2026) was published on 24 March 2026; earlier editions continue to apply to buildings subject to earlier standards, which the Part L guide explains. These are England rules, and Part F ventilation has its own document.

Ecodesign. The regulations cover air conditioners and comfort fans, and the manufacturer, authorised representative or importer is responsible for compliance. A declaration of conformity must be completed, supported by technical documentation, so that duty sits upstream of the building owner.

What do planning, noise and workplace rules add?

Planning permission is usually needed for equipment fixed to the outside; Lewisham Council's wording is typical. The planning guide covers the exceptions. Noise from plant is assessed under BS 4142 and can become a statutory nuisance, as the noise guide explains.

Inside the building, the Workplace Regulations 1992 require enclosed workplaces to be ventilated by a sufficient quantity of fresh or purified air, and the temperature to be reasonable. Regulation 7 also bars a method of cooling that lets fumes, gas or vapour escape into the workplace in a way likely to be injurious or offensive, a point to bear in mind with refrigerant leaks. Where water systems are involved, HSE says employers and those in control of premises must assess and manage legionella risk; the legionella guide covers where air conditioning sits in that.

Which safety standards and project duties apply?

BS EN 378-1 sets safety and environmental requirements for refrigerating systems and heat pumps, including the maximum charge for a room volume. It is a published standard rather than a statute; the legal duties sit in the regulations above. Under the Construction (Design and Management) Regulations 2015, installing or removing mechanical services fixed to a structure is construction work, and a client must make suitable arrangements for managing the project.

What applies when plant is removed?

A technician qualified to work with F gas must recover refrigerant, including at end of life, and stationary air conditioning is on the list. Recovered gas or the whole unit must go through a registered waste carrier to a licensed facility. Businesses must also complete a waste transfer note for each load leaving their premises. For older buildings, the asbestos guide covers what to check before plant is removed.

Sources

Common questions

Does a small split system need an F-gas qualified installer?

Yes for work that handles refrigerant. GOV.UK says individuals need their own qualifications to install new systems, and a category 2 certificate covers installing systems with less than 3 kg of F gas, or less than 6 kg if hermetically sealed. The installing company also needs certification from an approved body.

Does Part P apply to a commercial air conditioning installation?

No. GOV.UK describes Approved Document P as covering electrical safety in dwellings. Commercial electrical work falls under the Electricity at Work Regulations 1989, with BS 7671 as the technical guidance HSE points to, and the commissioning notice under the Building Regulations still applies where Part L does.

Who is responsible for leak checks in a leased building?

GOV.UK puts leak checks on the user of the equipment, and says a rental agreement may shift the duty for rented equipment. The lease and the maintenance contract show who is named, and the F-gas explainer shows what the checks must cover.

Regulation 7 of the Workplace Regulations 1992 requires the temperature in indoor workplaces to be reasonable and states no figure. The workplace temperature guide on this site covers what HSE guidance says in practice.

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