Deck vs Patio Installation: What’s Best for Your Hot Tub?

One of the first decisions when you buy a hot tub is where it will sit. For most people it comes down to a deck or a patio.

Both have pros and cons. The right choice depends on your budget, the layout of your garden, the look you want and how you plan to use the spa.

Here is how the two compare.

Installing a hot tub on a deck

A deck, usually timber or composite, raises the spa up and gives a warm, natural look. It is especially useful on a sloping site.

Pros:

• Built-in look: decking can surround the hot tub with steps, rails or bench seating.
• Works on uneven ground: a deck can be built level on a sloping garden.
• Design options: it is easier to add planters, lighting or different levels.

Things to consider:

• It must be strong enough. A full spa can weigh over 2,000 kg when filled, so you will need reinforced framing and footings.
• Higher cost and upkeep. Timber decks may need staining or sealing every year. Composite needs less upkeep but costs more.
• You may need planning permission or building control approval, depending on the height and structure.

Tip: If you are building a new deck, ask a structural engineer to confirm it can safely take a filled hot tub plus the people in it.

Installing a hot tub on a patio

A patio, usually concrete, stone or paving slabs, is flat and at ground level. It is often the cheaper option.

Pros:

• A strong, stable base. A well-laid concrete pad is one of the best bases for a hot tub.
• Lower installation cost than decking, especially if the area is already flat.
• Easy access. At ground level there are no steps, which helps with accessibility.
• Little upkeep. A solid patio needs very little maintenance.

Things to consider:

• Drainage matters. Make sure the area falls slightly away from the spa so rainwater doesn't pool. If you're laying a base in autumn or winter, our guide to buying a hot tub in autumn or winter explains why to allow extra curing time.
• It can look plain without some planting or built-in seating.
• Less suited to sloping or uneven gardens.

Tip: If you use paving slabs, make sure they are tightly laid on a solid base so they don't shift under the weight of the spa.

Quick comparison

How much weight does the base carry?

Whichever base you choose, it has to carry the filled tub plus everyone in it, spread over the tub's footprint. Here is what that looks like for a few of our models, using filled weights from the product pages and 75 kg per adult with every seat taken:

Model	Filled weight	With bathers	Footprint	Approximate load
Yukon (2 seats)	490 kg	640 kg	2.1 m²	300 kg per m²
Calgary (4 seats)	930 kg	1,230 kg	3.2 m²	385 kg per m²
Toronto (6 seats)	1,380 kg	1,830 kg	4.5 m²	400 kg per m²
Niagara (7 seats)	1,945 kg	2,470 kg	5.2 m²	475 kg per m²

Those loads sit on the base all the time, not just for a moment, and the tub's frame can concentrate them along its edges. A properly laid concrete slab handles this easily. A deck has to be designed for it.

Reinforcing a deck for a hot tub

If the tub is going on a deck, plan the structure around it rather than adding it to an existing deck as an afterthought. A builder or structural engineer should design it, but the usual approach includes:

• Closer joist spacing under the tub area, with joists sized for the load.
• Extra posts and footings directly under the tub, set on concrete pads below the frost line, so the weight goes straight to the ground.
• A flat, continuous surface under the whole base of the tub, not just under its edges.
• Durable materials rated for ground contact and wet conditions, because splashes and condensation will reach the structure.
• A plan for access to the service side of the tub, and a way to reach the drain valve.

Sinking the tub into the deck, so its rim sits at deck level, is a popular look. Our guide to installing a hot tub into decking covers this. Remember that raised platforms over 0.3 m high usually need planning permission under the Planning Portal's permitted development rules.

Laying a concrete pad, step by step

1. Mark out the area a little larger than the tub on every side, so the cabinet sits fully on the slab with room to step around it.
2. Dig out the topsoil and any soft ground down to firm subsoil.
3. Lay and compact a sub-base of hardcore or crushed stone in layers.
4. Set up formwork and check it is square and level.
5. Add reinforcement mesh if your builder recommends it for the tub's weight.
6. Pour and level the concrete. The surface where the tub sits must be flat and level. Any fall for drainage should be at the edges, away from the tub.
7. Let it cure fully before the tub is delivered and filled. Your builder will advise how long.
8. Plan the power route before you pour, so a duct for the electrician's cable can be built in if needed.

Paving slabs also work if they are laid tight on a compacted, level base. Slabs on sand or soft ground can sink unevenly under the load.

Drainage around the tub

• Make sure rain runs away from the tub and the house, not towards the cabinet or the electrics.
• On a deck, leave gaps between boards so water drains through, and make sure the ground beneath doesn't hold water.
• Think about where the water goes when you empty the tub. The household foul drain is usually the safest discharge point. Our drain valve guide explains the options.

Access for delivery

Hot tubs travel on their side on a trolley, so the route from the road to the base matters as much as the base itself. Before you build, measure every gate, path and corner, and look for steps, overhanging branches and tight turns. If the deck is raised, check how the tub will be lifted up onto it. Delivery is kerbside as standard, so if you are moving the tub yourself, line up enough help. Call us on 01293 824094 if you are unsure whether your route works.

Base options compared

Base	Load capacity	Level and flat	Drainage	Typical upkeep
Concrete slab	Excellent	Yes, if laid well	Fall at the edges	Very low
Paving on compacted base	Good	Yes, if tightly laid	Good through joints and falls	Low, check for movement
Purpose-built deck	Good when engineered	Yes, if designed for it	Through board gaps	Moderate for timber, low for composite
Existing deck, not checked	Unknown	Often not	Varies	Not recommended
Grass or loose gravel	Not suitable	No	Varies	Not recommended

Matching the base to your garden

• Flat garden, tub close to the house: a concrete slab or paving. Simple, solid and the lowest cost.
• Sloping garden: an engineered deck, or a retaining wall with a level slab cut into the slope.
• Existing patio: check it is level and that the slabs are on a firm base. Lift and relay any that rock.
• Tub sunk into a deck: plan the frame, access panel and drain point from the start.
• Renting or likely to move: a plug and play tub on a slab or paving keeps things simple to take with you.

Deck and patio FAQs

Can I put a hot tub on my existing deck?

Only if a builder or structural engineer confirms it can carry the filled weight plus bathers. Most decks are not built for that load.

How thick should a concrete base be?

That depends on your ground and the tub's weight. Ask your builder to specify it for your model.

Do I need planning permission for a hot tub deck?

Raised platforms over 0.3 m usually do. Check the Planning Portal or ask your council.

Can a plug and play tub go on paving?

Yes, if the paving is level and laid on a firm, compacted base.

Which is right for you?

Both can make a great hot tub area. The key is matching the base to your garden and what you want from it.

• Choose a deck if you want a raised, built-in look, especially on uneven ground.
• Choose a patio if the ground is flat and you want a low-maintenance, cost-effective base.

Whichever you choose, the base must be level, solid and strong enough to support the weight of a filled spa.

Need advice on installation or layout?
Our team can help you plan the right setup, from a raised deck with privacy screens to a simple, modern patio.

Choosing a hot tub?

Compare our hot tubs and swim spas, or visit our showroom near Gatwick.

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