The UK's only natural thermal hot spring spa, fed by the same geothermal springs used by Roman bathers 2,000 years ago. The open-air rooftop pool with views over Georgian Bath's skyline is the centrepiece.
Thermae Bath Spa stands as the United Kingdom's only natural thermal spa, drawing its waters from the same ancient geothermal springs that have welled up beneath Bath, Somerset, for over two millennia. The Romans built their famous baths here, and the rediscovered mineral-rich waters — reaching approximately 40°C — continue to draw visitors seeking both historic connection and genuine therapeutic benefit. The spa occupies a striking contemporary building in the heart of Bath's Georgian city centre, designed by architect Nicholas Grimshaw with an all-glass rooftop extension that has become one of the most photographed wellness spaces in England. The centrepiece is the open-air rooftop pool, where swimmers can soak in naturally warm water while gazing across the honey-coloured limestone rooftops and spires of the UNESCO World Heritage cityscape. On colder days, rising steam creates a dramatic contrast against the skyline, making the pool equally appealing in winter. The ground-floor New Royal Bath contains the main swimming pools, including the Minerva Bath — a substantial indoor pool with different temperature zones and a lazy river circuit. The Cross Bath, a smaller and more intimate outdoor facility situated across the road, can be hired privately for couples and small groups and is managed separately from the main spa. The Thermae Day Spa Wellness Suite on the second and third floors houses treatment rooms offering massages, facials, and body therapies that incorporate the mineral spring waters where possible. A session at Thermae Bath Spa is structured around two or four-hour bathing access blocks, during which visitors move freely between indoor pools, steam rooms, the waterfall feature, and the rooftop pool. Treatment appointments must be reserved separately and booked in advance. The spa operates a minimum age policy of 16 for all bathing areas. The waters contain calcium, magnesium, and sulphate minerals and are believed to ease muscle tension and joint discomfort. Robes and towels are provided and swimwear is mandatory throughout. The facility is a short walk from Bath Spa railway station, well served by Great Western Railway from London Paddington and Bristol.
Treatments
- Natural mineral bathing
- Aromatherapy massage
- Hot stone massage
- Holistic facial
- Body wrap treatment
Good to know
- Signature
- Rooftop open-air pool overlooking Georgian Bath
Highlights
- Rooftop open-air pool with panoramic views over Bath's Georgian UNESCO World Heritage skyline
- Natural geothermal mineral waters reaching 40°C, drawn from springs active since Roman times
- Cross Bath — separate outdoor pool available for private hire by couples and small groups
- Minerva Bath indoor pool with lazy river circuit and varied temperature zones
- Centrally located in Bath city centre, a short walk from Bath Spa railway station
Tips for visiting
- Book the rooftop pool session well in advance — weekend sessions sell out weeks ahead, especially during school holidays.
- The two-hour session suits first visits; a four-hour session allows time to move through the thermal suite and take a treatment.
- Swimwear is mandatory throughout the spa; robes and towels are included in the session price.
- The minimum age for all bathing areas is 16 — younger visitors cannot access the spa.
- Weekday mornings are the quietest time to visit; Saturday afternoons tend to be busiest on the rooftop pool.
Frequently asked questions
Do I need to book in advance?
Advance booking is strongly recommended, particularly for weekends and school holidays. Bathing sessions can sell out weeks ahead. Walk-in slots may occasionally be available on quieter weekday mornings but cannot be guaranteed.
What should I wear in the pools?
Swimwear is mandatory throughout the spa. Robes and towels are provided as part of the entry price. Casual clothing and underwear are not permitted in the pool areas.
Are children allowed?
The minimum age for the main bathing areas is 16. Children under that age cannot access the spa or rooftop pool. The Cross Bath has its own booking terms and visitors should confirm the age policy when reserving.
How hot is the water?
The natural geothermal spring water emerges at approximately 35–40°C and is maintained within that range. The temperature is consistent year-round, drawn from the same underground source used by the Romans.
Are the springs genuinely natural thermal springs?
Yes. The springs at Bath are among the few naturally occurring thermal springs in the United Kingdom and are the only ones safely accessible for bathing. The mineral content includes calcium, magnesium, and sulphate compounds.