What legislation applies to a commercial sauna in the UK?

Health and safety: the base duty

The Health and Safety at Work Act 1974 puts a duty on you towards customers and staff. The Management of Health and Safety at Work Regulations 1999 turn that into a practical obligation: a written, site-specific risk assessment. For a sauna that means heat exposure limits, hydration, single-user and unsupervised-use rules, maximum session times, age and medical exclusions, emergency procedures and what staff do if someone collapses.

Once you have five or more employees a written health and safety policy is mandatory. Below five it is still the document an inspector asks for first.

Electrical: the part most operators underestimate

Sauna heaters draw serious current in a hot, sometimes humid room. The Electricity at Work Regulations 1989 require the installation to be safe and maintained: an Electrical Installation Condition Report (EICR) from a qualified electrician, typically every five years or sooner if the report says so, portable appliance testing where relevant, and 30 mA RCD protection on the circuits. The Electrical Equipment (Safety) Regulations 2016 mean every powered unit must carry UKCA or CE marking and be suitable for the environment it sits in.

Keep the declaration of conformity and the manual for every heater and controller. If the manufacturer says commercial rating is required for your usage, a domestic unit is a compliance and insurance problem, not just a warranty one.

Fire

Under the Regulatory Reform (Fire Safety) Order 2005 (the Fire (Scotland) Act 2005 and the Northern Ireland Order 2006 elsewhere) you are the responsible person for your part of the premises. A fire risk assessment, coordinated with the landlord if you are a tenant inside a gym, extinguishers serviced yearly, emergency lighting tested, and exit routes kept clear every day. Saunas have a timber interior next to a high-temperature heater: the assessment must say how that risk is controlled.

Equipment and maintenance

PUWER 1998 requires work equipment to be suitable, maintained and inspected. In practice: manufacturer service intervals kept, a dated history per unit, and nothing unsafe left in service. Insurers and manufacturers ask for this history when something fails.

Insurance, customers and data

Public liability under the Occupiers' Liability Act 1957 covers slips, burns and heat-related incidents; check the wording names sauna use. Employers' Liability insurance is compulsory from your first paid member of staff, with the certificate available to them. Bookings taken online are distance contracts under the Consumer Contracts Regulations 2013, so price, cancellation policy and who you are must be shown before payment. Health screening answers are special category data under UK GDPR: a privacy notice, ICO registration and restricted access.

Local authority and premises

Check licensing and planning with your council in writing. Some authorities treat saunas as special treatments requiring a licence; a change of use of the room may need the landlord's and the planning department's agreement.