Commercial Services
What We Build
Spa & treatment rooms — calm, well-finished spaces with the moisture control and servicing a working treatment room actually needs.
Saunas — bespoke installations, built in-house to the same craftsmanship standard as our residential joinery.
Hot tubs & wet areas — correctly tanked, drained, and ventilated, not just plumbed in and hoped for.
Wellness retreats — full spa facilities for hotels, holiday accommodation, and standalone wellness businesses.
Cost of a Sauna at Home
Home sauna costs in the UK typically range from £3,000 to £12,000 for a quality installation, whether indoor or outdoor — with bespoke, fully custom builds running considerably higher. Indoor installations generally cost more than outdoor ones, since ventilation, waterproofing, and integration into an existing room all add complexity that a standalone garden structure doesn't have.
What actually drives the figure: size, heater type, timber specification, and how much electrical and structural work the site needs. We price every sauna against your specific space, not a generic model number.
Why Spas Need Different Thinking Than Standard Fit-Out
A spa space lives or dies on details most fit-outs never have to consider. Constant heat and moisture, every day, for years — not the occasional steam from a shower. Get the ventilation wrong and you're dealing with mould behind the cladding within months. Get the waterproofing wrong and the damage is happening somewhere you can't see it until it's expensive.
We build these spaces the way we'd want them built for our own use — proper moisture management designed in from the start, materials specified for sustained wet heat rather than occasional splashback, and servicing that's been planned, not retrofitted around a finished room.
Why Warvena
In-house tradespeople handle joinery, finishes, and waterproofing as one team, so nothing gets lost between subcontractors. We've built bespoke sauna and wellness features as part of wider hospitality projects across Cornwall, alongside our residential and commercial work. TrustMark registered · Passivhaus Trust listed · AECB members.
Where We Work
Across Cornwall — Truro, Falmouth, Redruth, St Ives, Padstow, Newquay, Penzance, and throughout the county.
FAQ's
Do you build saunas and treatment rooms for commercial use?
Yes, for hotels, wellness retreats, hospitality venues, and standalone spa businesses, as well as private residential installations.
What makes spa construction different from a standard bathroom fit-out?
Sustained heat and moisture, day after day. A spa needs proper ventilation, the right waterproofing system, and materials specified for constant wet-heat exposure — not just a more expensive version of standard bathroom work.
Can you build a spa as part of a wider hospitality or hotel project?
Yes — we deliver spa and wellness facilities as part of larger hospitality refurbishments and new builds, or as standalone projects.
Do you handle ventilation and waterproofing in-house?
Yes. The same team responsible for the finish is responsible for the waterproofing and ventilation behind it, so nothing gets missed in the handover between trades.
THINKING ABOUT A SPA BUILDING SERVICES IN CORNWALL?
Warvena Construction are TrustMark registered builders based in Redruth, Cornwall. In-house tradespeople, experience on Cornwall’s most demanding ground conditions, and the structural expertise to deliver basement projects correctly.