Hot tub dimensions and how much space you need

Typical hot tub dimensions run from about 1.5 m (5 ft) square for a two-seater to around 2.3 m (7 ft 6 in) square for a seven or eight-seater, with heights of 75-100 cm (30-39 in). On top of the footprint, plan for at least 45-60 cm (18-24 in) of clear space behind for the cover and around the service panels.

The space that catches people out is rarely the patio itself. It is the gate, the side passage, the low gutter and the tight corner the tub has to pass on delivery day, plus the gap you need to lift the cover and reach the pump. Measure all of those before you choose a size, not after.

What are typical hot tub dimensions by seat count?

Most acrylic hot tubs are square or close to square, and the footprint grows in steps as the seat count rises. The figures below are typical ranges across the market, not an industry standard. Two models with the same seat count can differ by 20 cm or more, so always work from the spec sheet of the tub you are considering.

The heights in the table are outside heights. The water depth inside is lower, and it also rises with the seat count. Typical interior depths at the deepest point are:

• Two seats: about 74-81 cm (29-32 in).
• Four seats: about 76-91 cm (30-36 in).
• Five and six seats: about 81-97 cm (32-38 in).
• Seven and eight seats: about 86-97 cm (34-38 in).
• Ten-seat party tubs: about 91-102 cm (36-40 in).

Three footprints come up again and again across manufacturers, so they work almost as standard sizes: about 1.98 m (78 in), 2.13 m (84 in) and 2.39 m (94 in) square. These roughly match four-seat, six-seat and eight-seat tubs. If a brochure lists one of these sizes, you can expect a fairly typical layout for that seat count.

Brochure labels such as small, medium and large are not standardised, so one manufacturer's medium tub can be another's large one. As a rough guide by the longest side: small is under about 2 m (2-4 seats), medium is about 2-2.3 m (5-6 seats), and large is about 2.3-2.75 m (7-10 seats). Anything above about 2.75 m (9 ft) is usually a commercial or bespoke build.

Water volume is included because it drives the weight, the running costs and your chemical doses. As a rough conversion, 1,000 litres is about 264 US gallons (220 imperial gallons). For a tub you already own or are looking at, working out how many litres your hot tub holds takes a few minutes with a tape measure.

The dry (empty) weight matters for delivery and for the base. Typical dry weights by size are:

• Two to four seats: about 180-320 kg (about 400-700 lb).
• Five to six seats: about 270-410 kg.
• Seven to eight seats: about 360-500 kg.
• The largest tubs: up to about 700 kg.

Small tubs: 2 to 3 seats

Compact two and three-seaters usually measure about 1.5-1.9 m across. Many are rectangular rather than square, often with one lounger and one or two upright seats. They suit couples and small patios, but the seats are close together and legroom is limited for taller people.

Medium tubs: 4 to 6 seats

This is the most common size in UK gardens. A footprint of around 2-2.1 m (about 6 ft 6 in to 7 ft) square fits most patios. A lounger takes up roughly the space of two upright seats, so a six-seat tub with a lounger often feels like room for five adults in practice.

Large tubs: 7 seats and more

Large family tubs are typically 2.2-2.4 m (about 7 ft 3 in to 7 ft 10 in) square and close to a metre tall. Above this size, manufacturers usually move into swim spas, which are commonly 4-6 m (13-20 ft) long, around 2.3 m wide and deeper than a hot tub. A swim spa is a different planning project and often needs a crane and a much larger base.

Seven and eight-seat tubs are often rectangular rather than square. Because of their size and weight, they usually need a purpose-built base or a large patio, rather than an existing small patio that was laid for garden furniture.

Some seven and eight-seat tubs also come with an L-shaped footprint, where one corner is cut out or extended. Check the actual outline on the spec sheet, not just the overall length and width, because the shape decides where the clearances fall and what shape the base needs to be.

Party tubs: 10 seats and more

The largest party tubs for ten or more people can reach about 2.7-2.9 m (about 8 ft 10 in to 9 ft 6 in) long and 2.4-2.7 m (about 7 ft 10 in to 8 ft 10 in) wide, with up to 1 m (39 in) of depth inside. Filled, they weigh well over 2,700 kg (about 6,000 lb). They almost always need a crane for delivery, so include a crane in your budget from the start.

How tall and deep is a hot tub?

The outside height of most acrylic hot tubs is between 75 cm and 100 cm. Taller tubs usually have deeper footwells and hold more water, which matters for floating and for taller users. A height of around 90 cm is common for medium models.

The water depth inside is less than the outside height, because the shell sits on a frame and the water line stops below the rim. Expect roughly 80-95 cm at the deepest point of the footwell, and less over the seats. Seats are moulded at different heights so that adults of different builds can sit with their shoulders under water.

Check both figures on the spec sheet: the interior water depth and the outside height. Some brochures give only one of them and call it 'depth', and the two are easily confused. The outside height decides delivery and steps, while the interior depth decides how comfortable the tub is to sit in.

Height affects more than looks. A tall tub needs a step for safe entry, and it can block the view from a low window. It also decides whether the tub fits through your gate, because the tub's height becomes its width when it travels on its side.

Does the shape change how much space you need?

Square and rectangular tubs

Square tubs use space efficiently, with seats in all four corners and room for a lounger. They sit neatly against a wall or fence, as long as you leave room for service access. Rectangular compact models are useful along a narrow patio or beside a path.

If you want two loungers side by side, a rectangular tub usually suits that layout better than a square one, because the longer side gives both loungers room to stretch out.

Round, octagonal and corner tubs

A round tub with a 2 m diameter takes up the same 2 m square on a plan as a square tub, but it usually seats fewer people, because the curved walls leave less usable seating. The leftover corners around a round tub are also hard to use. Triangular corner tubs exist for tight spaces, but check that the equipment bay can still be reached once the tub sits in the corner.

On the other hand, a round tub can suit a curved patio or the corner of a deck better than a square tub of similar capacity. It has no square corners to clear, so it can sit closer to a curved edge or an angled rail while still leaving room to walk around it.

Round hard-shell tubs typically range from about 1.5 m across for two people to about 2.3 m for six or seven. A 2 m round tub usually seats four or five. Octagonal tubs also exist, typically about 2.1 m across for five or six people.

Round and octagonal tubs need a base that supports their whole outer edge. Make the pad large enough that no part of the rim hangs over it, and confirm the support requirements with the installer before you lay the base.

Inflatable tubs

Inflatable tubs are usually round or square, about 1.8-2.1 m across on the outside and 65-75 cm tall. The walls are thick, so the inside is noticeably smaller than the outside measurement. The seat count usually assumes everyone sits on the floor with legs touching.

Across the range, inflatables run from about 1.8 m across for two to four people to about 2.3 m for six to eight, and they hold roughly 570-1,100 litres (about 150-290 US gallons). Because you sit on the floor, the depth inside is only roughly 65-75 cm from the rim to the floor, and the water sits below the rim. Taller adults may struggle to sit with their shoulders under water.

A filled inflatable still weighs about 650-1,250 kg (about 1,430-2,760 lb), and more with people in it. Check the load before you put one on decking or a balcony, in the same way you would for a hard-shell tub.

The pump and heater unit of an inflatable tub sits beside it on the ground, so add room for that unit and for reaching its controls. It needs a firm, level and dry spot, just like the tub itself.

An inflatable tub does not need cover lifter clearance. Its soft cover lifts off and folds away by hand, so you only need enough space beside the tub to put the folded cover down.

In-ground and built-in tubs

A sunken tub, or one set into decking, needs the hole or frame built to the manufacturer's installation drawing, not just to the outside dimensions. You also need a way to reach the pump, heater and pipework, such as a removable deck panel, a hatch or an access pit beside the tub. Without that, a simple repair can mean lifting the whole tub out.

In-ground tubs are built in one of three main ways: sprayed concrete, a preformed fibreglass shell, or a vinyl-lined shell. They are often built alongside a swimming pool or into one, sharing its equipment and surround.

Typical in-ground interior sizes are about 1.5 m (5 ft) square for a small tub, about 1.8-2.1 m (6-7 ft) square for a standard tub, and about 2.1-2.4 m (7-8 ft) square for a large or pool-integrated tub. The walls are usually about 15-20 cm (6-8 in) thick, or 20-30 cm (8-12 in) for the largest builds.

The excavation for an in-ground tub is usually about 30-45 cm (12-18 in) larger than the finished interior on every side, to leave room for the walls and pipework. Measure the excavation area against your space, not the tub size. The coping around the edge also adds roughly 10-20 cm (4-8 in) to the visible footprint on each side.

In-ground tubs are usually deeper than freestanding ones, at about 90-120 cm (35-47 in) inside. Preparing the base, which means digging, laying a compacted gravel sub-base and pouring concrete, typically adds about three to five days to the installation. Check with your council whether planning permission or building regulations apply before you start digging.

Bespoke concrete or timber tubs are built to the size you choose. The same principles apply: plan the equipment location, drainage and service access before the build, and allow for the thickness of the walls when you work out the seating space. If space is tight, our guide to fitting a hot tub into a small garden looks at compact layouts in more detail.

Bespoke concrete tubs

A concrete tub is only practical from about 1.2 m (4 ft) square inside. Common family sizes are about 1.8 x 2.1 m to 2.1 x 2.4 m inside, with an interior depth of typically 90-105 cm. Some bespoke builds go as deep as about 1.2 m (47 in) inside for a fully immersed soak.

The walls are typically 15-20 cm (6-8 in) thick, so the outside is 30-40 cm larger than the inside in each direction. Waterproofing and tiling add a little more. Plan your space around the outside size, not the interior.

A concrete tub also needs a separate equipment cabinet or plant room for the pump, heater and filter, of at least about 60 x 90 cm (24 x 35 in). The build typically takes four to eight weeks from digging to the first fill.

How much clearance does a hot tub need around it?

The footprint on the spec sheet only describes the box. In use, you need space to lift the cover, step in and out, and open the panels for servicing. Your manual gives the exact clearances for your model, and they vary between manufacturers, so treat the figures here as a starting point.

Room for the cover lifter

Most cover lifters fold the cover in half and swing it over the back of the tub, where it hangs or stands upright. That usually needs about 45-60 cm of clear space behind the tub, and some lifter designs need more. Low-clearance lifters are made for tubs that sit close to a wall, but they still need some gap.

Check the space above the tub too. When the cover stands up behind the tub, its top edge can be well over a metre above the rim. Under a pergola, gazebo or low roof, measure from the ground to the lowest beam and compare it with the tub height plus the raised cover.

Service panels and the equipment bay

The pump, heater and control box sit behind a removable side panel, usually in one corner of the tub. A technician needs to kneel in front of that panel with tools, so leave at least 60 cm (24 in) clear on that side, and more if you can. Some manufacturers ask for access to all four sides, because leaks and pipe joints can be anywhere around the shell.

If one side has to sit against a fence or wall, choose a tub with the equipment bay on an open side, and make sure the tub could be slid out if needed. Never build decking, steps or a fixed bench over a panel without making that section removable.

Check the spec sheet to see which side the service panel is on before you fix the tub's position. Once the tub is in place, keep planters, storage boxes, cabinets and trellis away from the front of that panel.

Steps, walkways and surroundings

Spa steps are usually around 40-60 cm deep, so add that to the side you climb in from. If you plan a handrail as well as steps, allow about 60-90 cm in total on the entry side. Leave a clear walkway to the house, wide enough to carry a tray or help a child, and keep the route free of trip hazards in the dark.

External spa steps are often sold separately from the tub. Include them in your budget, and include their depth in your layout from the start rather than finding room for them after the tub arrives.

Think about what is above and around the tub as well. Overhanging trees drop leaves and sap into the water, and a dripping roof edge will run onto the cover. Keep the tub well away from overhead power cables.

• Behind the tub: about 45-60 cm for most cover lifters, or as your manual states.
• Equipment side: at least 60 cm of clear kneeling space.
• Entry side: the depth of the steps plus a walkway, or about 60-90 cm with a handrail.
• Above the tub: the tub height plus the raised cover, if there is any roof or beam.
• Remaining sides: panels reachable or removable, even if the space is narrow.

A worked example

Take a 2.1 m square tub with the cover lifter behind it and compact steps at the front. Add about 45 cm behind for the lifter and about 35 cm for the steps, and the clear area you need is about 2.1 x 2.9 m, not just the 2.1 m square footprint. If the equipment panel is on a third side, add at least 60 cm there as well.

Will the hot tub fit through your gate and side passage?

Most hot tubs arrive on a trolley or sled, tipped onto one edge. On its side, the tub's height becomes its width, and its length becomes its height. That combination is often called the delivery envelope: the width, height and turning space the tub needs on its way from the vehicle to the base.

A medium tub that is 90 cm tall therefore needs a gap a little over 90 cm wide, plus room for the trolley and the hands of the delivery team. As a rule of thumb, allow at least 10-15 cm more than the tub's height, and ask your delivery team what they need, because some need more.

As a general rule, plan for a delivery route of at least about 1 m (39 in) wide at every point. Many standard garden gates are only about 90 cm (35 in) wide, which is too narrow for most hard-shell tubs.

Measure the delivery route before you choose a model, not after. A tub that fits the patio but cannot pass the side gate is one of the most frustrating mistakes, and it is far easier to change your choice of tub than to change your house.

How to measure the delivery route

1. Walk the route from where the delivery vehicle will park to the base, and note every gate, door, passage, step and corner.
2. Measure the narrowest width at each point, including gateposts, hinges, bins, downpipes, meter boxes and outside taps that stick out into the passage.
3. Measure the lowest overhead point along the route, such as a gutter, arch, porch roof or tree branch. On its edge, the tub needs roughly its longest side plus the height of the trolley.
4. At every corner, mark the tub's length on the ground with string and check it can swing round. Tight turns in narrow passages are a common problem, even when the straight widths are fine.
5. Count the steps and note any slopes, soft lawn or gravel. Delivery teams can handle some of these, but they need to know in advance and may bring boards or extra people.
6. Compare your smallest measurements with the tub's height, width and length, and send the numbers and photos to the supplier before you order.

Pay particular attention to sharp right-angle turns, for example where a narrow side passage meets the back garden. A tub on its edge may not be able to swing round such a turn even when every straight section is wide enough. It can then need specialist moving equipment or a crane, so tell the delivery team about any such turn when you book.

Before you order, ask the retailer for a site survey or a delivery check. Many retailers confirm delivery feasibility free of charge, and they know what their delivery team and equipment can manage.

Take this seriously. If the tub cannot reach the base on delivery day, it may be taken away again, and you may have to pay return or redelivery charges.

What if the tub will not fit?

You have several options. Gates can often be lifted off their hinges and fence panels removed for the day. A slightly smaller or shorter model may pass where a larger one cannot. If there is no route at all, a crane can lift the tub over the house, but this adds significant cost and needs space for the crane, a lifting plan and sometimes a permit from the council.

• The gate opening is narrower than the roughly 1 m the delivery needs: a gatepost can sometimes be removed temporarily, or the gate can be widened permanently.
• A pergola beam or another low structure blocks the tub on its edge: taking part of the structure down temporarily is an option.
• A path is too steep for a delivery trolley to go up safely: ask for a crane quote.
• There is no access to the back garden at all: consider installing the tub where it can be reached from the front.

Moving a hot tub is heavy work, because even an empty acrylic tub can weigh several hundred kilograms. The HSE's guidance on manual handling explains why heavy loads need planning and enough people. If you ever need to relocate a tub, read our guide on how to move a hot tub safely first.

Can your base take the weight of a filled hot tub?

Dimensions and weight go together. Water weighs about 1 kg per litre, so a medium tub holding 1,400 litres carries 1,400 kg of water before you add the shell and the people. Add an empty weight of about 300 kg and six adults at around 80 kg each, and the total is close to 2,200 kg (about 4,850 lb).

Spread over a 2.1 m square footprint (about 4.4 m²), that is roughly 500 kg per square metre. A level, solid base copes with this easily. Many manufacturers recommend a reinforced concrete slab around 100 mm (4 in) thick, or an approved paving or spa pad system, but requirements differ, so follow your manual.

You can do the same calculation for any tub. Add the dry weight in kilograms, the water volume in litres (each litre weighs about 1 kg) and about 80 kg per seat. Then divide the total by the footprint in square metres to get the load in kilograms per square metre.

As a reference value for a smaller tub, a four-seat tub that is filled and has four adults in it typically weighs about 1,350-1,550 kg (about 3,000-3,400 lb). Even a small hard-shell tub therefore needs a base planned for well over a tonne.

A filled and occupied tub typically weighs at least four to five times its dry weight, and often more. Never plan the base around the dry weight figure in the brochure.

Ordinary garden decking and domestic floors are typically designed for only around 150-200 kg per square metre (about 30-40 lb per square foot). That is far below the roughly 500 kg per square metre of a filled hot tub, so a deck that looks solid is not necessarily strong enough.

If your existing deck is not strong enough, a structural engineer can often specify reinforcement, such as extra joists, posts or footings under the tub. This is usually cheaper than rebuilding the deck, and far cheaper than a structural failure.

Make the base slightly larger than the tub where you can, so the frame is fully supported and you have firm ground to kneel on when you open the panels. Decking, patio slabs laid on sand and raised areas all need checking, and any elevated structure needs a structural engineer. Our article on whether you can put a hot tub on a balcony explains why.

As a guide, the concrete base or pad should extend at least about 15 cm (6 in) beyond the tub on every side. A 2.1 m square tub therefore needs a base of about 2.4 m (about 8 ft) square.

Your layout also needs room for the electrical supply. Plan where the cable will run and where the isolator will go: it must be easy to reach for switching off, but out of reach of anyone in the water. In the UK, a hard-wired supply should be installed by a registered electrician to BS 7671 with RCD protection, and in England and Wales a new circuit for a hot tub is notifiable under Part P. Other countries have their own rules, and Electrical Safety First has general advice on electrical safety at home.

Get professional advice if the deck or patio is raised more than about 60 cm off the ground. Do the same if the tub will sit a long way from the consumer unit, for example 30 m (about 100 ft) or more, because a long cable run needs a correctly sized cable.

How do you measure your garden for a hot tub?

Before you shortlist models, map out the space with real numbers. A tape measure, string, a few pegs and a phone camera are all you need.

1. Measure the area where the tub will sit, wall to wall or fence to fence, and note any drains, manhole covers, downpipes or outside taps nearby.
2. Mark the tub footprint on the ground with string or tape, using the largest size you are considering.
3. Subtract the tub's footprint from the measured space to see how much clearance is left on each side.
4. Add the clearances: about 45-60 cm behind for the cover lifter, at least 60 cm on the equipment side, and the depth of the steps on the entry side. Check that each remaining margin still allows for them.
5. Stand inside the outline and check the views, the privacy from neighbours and the distance to the back door. Look at it again in the evening.
6. Check the ground. It must be level and able to take the full filled weight, so plan any slab or pad before the tub arrives.
7. Measure the delivery route and compare the narrowest gap with the tub's height.
8. Note where the electrical supply will come from and where the isolator could sit.

Once you have measured, write down your key limits in one place. Then rule out any model that exceeds them before you visit a showroom, so you only compare tubs that will actually fit:

• Largest tub footprint: the space available, minus about 15 cm of base overhang on each side, minus the clearances for the cover lifter, the equipment side and the steps.
• Narrowest width on the delivery route: compare this with the tub's height.
• Lowest overhead height on the delivery route: compare this with the tub's longest side plus the trolley.

As a guide, a compact 2 m tub needs at least about 2.4 x 2.4 m including the base overhang. Once the cover lifter and service clearances are added, you need about 3 x 3 m, which is a realistic minimum for most tubs.

For a full walk-through from preparing the base to the first fill, see our guide on how to install a hot tub, step by step.

What mistakes do people make when planning for hot tub size?

• Measuring the patio but not the gate, the side passage or the corner at the back of the house.
• Pushing the tub tight against a fence, leaving no room for the cover lifter or the service panels.
• Forgetting the height of the raised cover under a pergola or gazebo roof.
• Choosing by seat count alone, when loungers, footwell size and seat depth affect comfort more than the number in the brochure.
• Building decking around the tub with no removable section over the equipment bay.
• Assuming an inflatable tub holds as many adults comfortably as a hard-shell tub with the same seat count.
• Ignoring the filled weight, particularly on decking, raised patios and roofs.
• Overcrowding a small tub, such as six adults in a four-seater. It is uncomfortable, and it adds weight beyond what the base was planned for.

When a different size or type makes sense

If the clearances will not fit, a smaller or rectangular tub with proper access is a better choice than a larger tub boxed in against a wall. Every service visit will be easier, and the cover will open the way it was designed to.

If the delivery route is too tight for any hard-shell tub, the realistic options are an inflatable tub, removing a gate or fence panel for the day, or a crane delivery. Decide which one suits you before you settle on a model.

An inflatable tub suits a rented or temporary garden, and a site that cannot take the load of a hard-shell tub. However, it heats more slowly, holds its heat less well and has weaker jets. That makes it more expensive to run in cold weather and for year-round use.

Budget is another reason to choose an inflatable. If your budget is under about £1,500-2,000, an inflatable tub is usually the realistic option, because hard-shell tubs generally cost more once delivery and a suitable base are included.

An in-ground tub can make sense as part of a full garden redesign with a contractor. It avoids the delivery route and raised base problems of a hard-shell tub, but it takes longer to build.

Summary: planning the space for your hot tub

Most hot tubs are between 1.5 m and 2.4 m square and 75-100 cm tall, with larger seat counts adding width and height in steps. The footprint on the spec sheet is only the start of your planning.

Allow space behind for the cover lifter, a clear side for the equipment bay, room for the steps, and enough height above if the tub sits under a roof. Then measure every gap on the delivery route against the tub's height and longest side, and confirm the base can carry the full filled weight.

Frequently asked questions

Should I buy a bigger hot tub than I think I need?

Not automatically. A larger tub holds more water, so it costs more to heat, needs more chemicals and weighs more. Think about how many people will use it on a normal evening, not on the busiest day of the year. If two or three people will use it most of the time, a medium tub with a lounger is often more comfortable than a large tub that is rarely full.

How close can a hot tub be to a fence or house wall?

It depends on the model, so check the installation section of your manual. As a guide, most cover lifters need about 45-60 cm behind the tub, and the side with the equipment bay needs at least 60 cm for a technician to kneel. A side with no equipment can sit closer, as long as its panel can still be removed or the tub can be slid out.

Will a hot tub fit through a standard doorway?

Usually not. Internal doors in UK homes are often around 76-84 cm wide, and most hard-shell tubs are taller than that, so they cannot pass through on their side. This is why tubs normally go round the side of the house or over it by crane. Inflatable tubs are the exception, because they arrive folded in a box and are assembled where they will sit.

How much space does an inflatable hot tub need?

Allow the outside diameter of the tub, usually 1.8-2.3 m, plus room beside it for the pump and heater unit and for reaching its controls. Leave space to walk around it and to lift the cover off. The ground must be flat, firm and free of sharp stones, and a protective ground mat under the tub helps protect the base.

Can I put a hot tub in a garage or conservatory?

It is possible, but the space needs more than floor area. Warm water releases a lot of moisture, so the room needs good ventilation to avoid condensation and damp. The floor must take the full filled weight, and you need a way to drain the tub. Check that the delivery route into the room works and that a registered electrician is happy with the supply.

Do seat counts mean the same thing between manufacturers?

No. Seat counts are set by each manufacturer, and there is no common standard for how much space a seat must have. One six-seat tub can feel roomy while another feels cramped. Compare the footprint, the footwell size and the number of loungers rather than the seat count alone, and sit in a dry display tub if you get the chance.