Hot Tub Foundation And Placement Options

A Hot Tub can be placed anywhere outdoors, even in densely populated areas. The foundation on which the Tub stands must be stable and can be built using either a wooden frame, concrete base or a compacted gravel bed. The Hot Tub must never be placed directly on grass.


Stone Foundation

Wooden Frame

Wooden Foundation


Gravel Foundation



Many people now prefer to integrate their hot tub into decking or a terrace. If this is something that interests you remember to plan in advance.

A few essential points to remember are:

  • It should be comfortable to step down into the bath, and also to get out again.
  • The edge of the tub ought to be placed around 30-40 centimetres above the floor of the decking or terrace. If the edge of the tub is flush with the floor of the decking or terrace then it might feel like you’re stepping into a well and a rail for support is recommended.
  • Consider how the tub can be drained before integration.
  • Ensure that all service hatches are accessible and can be removed without issues.

Below are some examples of how you can integrate a Luxwel Hot tub into your decking or terrace.


Hot tub sunk into decking. In this tub it is comfortable getting in and then out again. The heater with connection pipes is placed on the outside of the terrace for easy access.

Luxwel Hot Tub in Terrace

Insulated hot tub with stairs integrated into the decking.

Luxwel Hot Tub on decking

It will also work to place the hot tub above the decking thanks to the integrated stairs on some Luxwel models.

Sunken Hot Tub

Integrating the hot tub further into the decking is another popular option. Incorporating a hatch into the decking is advised so that the components can be accessed easily.

Plumbing 1

Placing the insulated base in a way that side- and bottom insulation, which is made of hard styrofoam, meet so they are on top of each other and like that it is well protected against the cold. You can read more about it in our assembling instructions.As you can see on the picture the drainage has been done that it goes directly to the drainage outside the house.Pumps and pipes are protected within the insulated box.

Plumbing 2

It would be also possible to place the filtration system in another room, eg. in the cellar.

Please note that you if are wishing to integrate your hot tub into decking the bottom and sides of the tub located underneath need to be adequately insulated. We recommend using hard styrofoam. Also remember that any pumps and pipes need to be protected within an insulated box with piping lagged accordingly. Luxwel provide all of the foam needed and the box for housing the filtration system and heater.


Foam insulation
1 = 50 – 70 mm
2 = 40 mm
3 = 50 mm hard foam insulation
4 = 30 mm hard foam insulation

Marine Seal

Marine Seal finish is an elastic transparent material that is coated onto the inside of the hot tub, providing a durable, clean surface that is easy to maintain, while protecting the inside of the hot tub.

It is based on the principles used in sealing decks of luxury yachts. The sealed, smooth surface provides a cleaner feel to the tub, and will improve water clarity and ease of maintenance.


LunaWood™ is Grade A pine wood that has undergone a special heat-treatment that leaves it impervious to dry weather, easier to maintain, and resin seepage eliminated. In addition to this, the insulation capacity of the wood is improved by as much as 30%. The special heat-treatment process effectively ages the wood by over 200 years; firmly cementing its stability as a material that is both durable and inherently fit for purpose.

The Benefits of LunaWood™
  • Wood becomes a darker, more luxurious colour all the way through
  • Risk of mould formations is drastically reduced
  • Insulation capacity improved by 30% on standard wood
  • Resin is eliminated
  • Material is lighter, but is more durable
  • Moisture content is reduced by up to 90%
  • Environmentally-friendly material without additives
  • Minimal maintenance, oil treated once a year if required
  • Wood is more stable, meaning that it will not leak
  • Wood maintains a durable and stable shape
  • Not sensitive to dry or damp conditions
  • Allows permanent contact with water, as well as resistance to weather and wind.

During the heat-treating process, the wood is effectively aged, so that its structure becomes like that of hundred year old trees, rendering the wood far superior in terms of its strength and durability.

In addition to the exceptional durability of heat treated LunaWood™, another benefit is the woods colour, which resembles more “exotic” species of wood, ranging from light to dark brown.

LunaWood is more expensive than ordinary pine, but the cost is recovered through its durability, which leaves it an almost maintenance free material. Hot tubs made from LunarWood stand the test of time, and are a beautiful addition to any outside space. For the sake of aesthetics, we recommend a simple oil treatment once a year to maintain the colour of the wood. Alternatively the wood can be left and it will turn a dark silver colour.

Environmentally Friendly

The material is kind to the environment, and has no detrimental effect on nature through the use of unnecessary and harmful chemicals. During the heat-treatment process, only steam and heat are used, no toxic chemicals of any kind are involved, which may also provide peace of mind when you consider that your skin will be exposed to the inside of these natural hot tubs.