Hot Tub Decking Across London & Hertfordshire
homeowners installing a hot tub who need the deck sized to carry the loaded weight
A hot tub deck carries a genuinely different load to a standard garden deck — a filled six-person tub plus occupants can run to well over a tonne on a small footprint, and domestic joist spacing simply isn't built for that.
This is a load-rating brief first and a finish brief second: get the frame right and the surface choice is straightforward.
The frame that actually carries the load
150×47mm C24 joists at 300mm centres over doubled bearers under the tub footprint, calculated to around 400kg/m² loaded — not a generic domestic deck spec scaled up by guesswork.
- Trex or Q-Deck composite for a wet, chlorinated environment
- Yellow balau hardwood for a natural finish that handles moisture
- Removable board sections over the tub base for pump and filter access
Planning for maintenance access
Boxing a tub in with no access is a common mistake — the first pump fault then means cutting the deck up. We build in removable panel sections at the frame stage so servicing doesn't mean demolition.
Surface choice for a wet environment
Grooved composite boards keep grip when wet, which is the entire point of a hot-tub deck surface — a smooth or worn timber surface around a wet tub is a genuine slip risk.
Hot Tub Decking — frequently asked
How strong does decking need to be for a hot tub?
Significantly stronger than standard domestic decking — we calculate the frame to around 400kg/m² loaded under the tub footprint, not a generic joist spacing.
Can I add a hot tub to an existing deck?
Only if the existing frame is checked and, usually, reinforced under the tub footprint — most standard decks aren't built to carry a filled tub as-is.
How do you allow access to the pump under the deck?
Removable board sections over the tub base, built in at frame stage.
Is composite slippery around a wet tub?
Grooved composite is specifically chosen to keep grip when wet — smooth composite or worn timber is more of a slip risk.
How high can a hot-tub deck be built before it needs handrails?
Building regulations generally require a handrail once the drop exceeds 600mm — we build to that as standard on raised installations.
Hot Tub Decking by town
Pick your town for local council rules, postcodes and property context.
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