A new two-storey, 44,000sq ft (4,087sq m) spa will open at the South Lodge hotel in Horsham, England, will open later this year after a £14m investment.

The five-star country house hotel is owned by Exclusive Hotels & Venues, whose portfolio includes Pennyhill Park, which also includes a substantial spa.

Spa consultancy Sparcstudio have worked on the spa design and concept, which has been created with sustainability in mind.

The architecture brings the outside in and extends the spa out into the grounds, where terraced sun decks will surround the UK’s first heated natural swim pond. The 20m swim pond features natural filtration, and the spa’s building design features curving, grass-covered roofs and cascading terraces with natural pools.

Drawing inspiration from the surrounding South Downs, the building itself takes on the famous sweeping landscape, with floor to ceiling windows making the most of the stunning views.

Fourteen nature-themed therapy rooms will host a selection of treatments, all of which have been developed with the natural philosophy of Exclusive’s bespoke product range, The Spa, in mind. Guests will also be able to enjoy the benefits of BioEffect, an Icelandic range with a results-driven formula, as well as Omorovizca, whose mineral-rich products were born from the famous Budapest thermal baths.

The spa will include a juniper-infused sauna and two steam rooms – one salt and one herbal, as well as a further two swimming pools – an indoor heated infinity edge ozone treated pool and an outdoor vitality hydrotherapy pool.

Fitness offerings include a Technogym-outfitted gym, an alfresco training terrace, spin studio and a holistic studio for yoga and Pilates.

There will also be a nail and pedicure salon, in partnership with Ridgeview, and a male grooming bar complete with a barber.

Between treatments, guests can refuel at Botanica, a new spa restaurant that draws on the South Downs as a larder for fresh and seasonal ingredients.