Hot tub decking ideas that suit UK gardens

The best hot tub decking ideas for UK gardens are raised decks for sloping or awkward ground, partly sunken decks that lower the step-in height, and wraparound decks with built-in steps. Each works well if the tub sits on a base that can carry its full weight, water drains away freely and the service panels stay easy to reach.

Each design is explained here in plain terms, with the structural and practical points a technician checks before anything is built. Use it to sketch your plan, then take that plan to a builder, deck installer or structural engineer with the right questions ready.

What hot tub decking ideas work best in UK gardens?

UK gardens bring a few particular challenges: wet winters, clay soils that move, sloping plots and neighbours close by. A good deck design deals with all four, not just with how it looks on the first day.

Most successful projects follow one principle. The hot tub sits on its own solid base, usually a concrete slab, and the deck is built around it or up to it rather than underneath it. This keeps the heaviest load off the timber and lets the deck itself be built to normal garden standards.

The single most important decision is where the weight goes. If you can, set the hot tub on a reinforced concrete slab and build the deck around it. Putting a filled tub on top of a timber deck is possible, but only when the frame has been designed for that load by someone qualified.

Our guide to hot tub base options and what to put underneath explains slabs, paving and ground pads in detail. The ideas below assume one of those is in place unless stated otherwise.

What should you check before choosing a design?

Before choosing a design, note the garden's measurements, which way it faces for sun, whether the ground is level or sloping and the direction of the prevailing wind. These four facts narrow down which layouts will work. A sloping plot points towards a raised or stepped deck, and an exposed spot needs screening built into the plan from the start.

1. Measure the garden and record its sun aspect, its slope and the direction of the prevailing wind.
2. Write down the tub's dry weight, water capacity and footprint, or those of the size you are considering.
3. Ask a structural engineer to confirm the site and base can take the load before you spend anything on premium boards, screens or features.
4. Give the engineer's design to the deck builder, so the builder works to a plan that already accounts for the tub's load.
5. Choose boards, screens and lighting once the structure is settled.

Getting this order right protects your budget. If a layout later proves structurally unworkable, money already spent on finishes for it may be wasted.

Simple, hybrid and reclaimed-look layouts

A low deck about 150-300 mm (about 6-12 in) off the ground gives a clean, modern look. Run all the boards in one direction and use hidden fixings. A single board direction also makes a small area feel larger.

A hybrid layout surrounds the tub with paving laid on a compacted sub-base and adds only a small timber platform for the steps. This keeps the area of decking that needs heavy framing to a minimum, while still giving the warmth of timber where you step in.

Another modern layout pours small concrete pads at the corners of the deck as anchor footings and spans the deck boards between them. The contrast of plain concrete and boards gives a clean, modern look, and the pads provide the footings the structure needs anyway. Ask your engineer or builder to set the size and depth of each pad.

For an aged, rustic look, reclaimed timber can be used for non-structural cladding or surround panels. All the framing underneath must still be new treated timber, because the strength and condition of reclaimed wood cannot be relied on.

Can a deck take the weight of a filled hot tub?

Water weighs 1 kg per litre. A hot tub holding 1,500 litres (about 400 US gallons) carries 1,500 kg (about 3,300 lb) of water before you add the shell, the cabinet and the people inside. Your manufacturer's specification sheet gives the filled weight for your model, and that is the figure to design around.

As a concrete reference, a filled six-person hot tub with bathers in it typically weighs about 2,300-2,500 kg (roughly 5,000-5,500 lb). That is more than a mid-size SUV, and it all rests on the tub's footprint.

That weight sits on a small footprint. As a rough illustration, about 2,100 kg spread over a tub measuring 2.2 m by 2.2 m (about 7 ft 3 in square) works out at more than 400 kg per square metre. Ordinary domestic floors in the UK are designed for an imposed load of about 1.5 kN/m² (roughly 150 kg per square metre, or about 31 lb per square foot), so a typical garden deck is not built for this.

If the deck's load capacity is a concern, a smaller or inflatable hot tub holds less water and weighs less. Even these still put a heavy load on the base when filled, so they need the same structural check as any other tub.

Is there a load rule for hot tub decks?

You may see a figure of 100 lb per square foot (about 4.8 kN/m², or roughly 490 kg per square metre) quoted as a rule for hot tub decks. It is a North American rule of thumb, not a UK standard, and some filled tubs need more than that. Treat it as a reminder that a hot tub deck needs far more strength than a normal deck, not as a design value.

What makes a deck strong enough?

• Joists sized by calculation for the actual load, often deeper and closer together than on a standard deck
• Extra beams and posts directly under the tub footprint
• Posts on proper concrete footings below the soft topsoil, not resting on paving slabs
• Ground-contact timber treated to Use Class 4, with fixings rated for outdoor use
• Joist hangers and bolts specified for the load, not just screws
• A completely level surface, since most manufacturers require the base to be flat and fully supported
• Allowance for other heavy items, such as large planters filled with wet soil and heavy furniture, which add a significant load the frame must be designed to carry

Joist size and spacing depend on the span, the timber grade and the load, so there is no safe general answer. A structural engineer or experienced deck designer can calculate it for you. For a structure holding more than two tonnes of water and people, that calculation is money well spent.

When should you call a structural engineer?

• Any plan to put a filled hot tub on a timber deck or raised platform
• Decks fixed to the house wall, where the wall and its damp-proof course need protecting
• Roof terraces, balconies or any structure built over a room
• Steep slopes, retaining walls or made-up ground
• Clay soils near trees, where the ground can shrink and swell with the seasons
• Partly or fully sunken tubs close to foundations, drains or boundaries
• Any sunken or recessed installation that needs a pit dug, even when it is well away from foundations, drains and boundaries, because the pit sides, the slab at the bottom and the drainage all need checking

Before you contact an engineer, gather three figures: the tub's dry weight, its water capacity in litres and the area of its footprint in square metres. These are the first things they will ask for. A tub measuring 2.2 m by 2.2 m, for example, has a footprint of about 4.8 square metres.

Planning permission or building control sign-off for a deck does not mean anyone has checked that its frame can carry a filled hot tub. Those approvals look at other questions, so the tub's load still needs its own structural check.

A structural engineer's fee for a hot tub deck is typically a few hundred pounds. That is small next to the cost of strengthening or rebuilding an undersized frame later.

How do you design a raised hot tub deck?

A raised deck suits a sloping garden, where it creates a level platform without major digging. It can also lift the seating area to give a better view or bring it level with a back door.

The strongest version keeps the tub on a slab at ground level and raises the deck to meet its rim, so you step across rather than climb up and in. The deck then frames the tub but only carries people and furniture. If the tub has to sit on the raised structure itself, that part of the frame needs the engineered design described above.

On a deck that wraps around the house or serves several uses, put the hot tub at the quietest end, away from the main entertaining or dining zone. Bathers get more peace, and splashes and steam stay away from the table.

A small raised platform reached from a side door or utility-room door, about 300-450 mm (12-18 in) above the ground, makes the hot tub a separate destination away from the main living and entertaining areas. The route to it is mostly used after dark, so light the path and the platform edge well. In England, a platform at this height is usually above the 300 mm planning limit, so check before you build.

Practical points for raised decks

• Height: in England, decks or platforms more than 300 mm (about 12 in) above the ground usually need planning permission
• Guarding: many designers add a balustrade where the drop is more than about 600 mm (about 2 ft), so ask your local building control for advice
• Ventilation: keep the sides open or slatted so air moves underneath and the timber dries out
• Overlooking: a raised deck can look into neighbouring gardens, which matters for planning and for good relations
• Underneath: keep the space clear of stored items so you can inspect posts, pipes and cables
• Terraces and balconies: on a first-floor terrace or balcony, route splash and drain-down water away so it cannot soak into the structure or the room below

You can check the current household rules on the GOV.UK planning permission page. Scotland and Northern Ireland have their own planning systems, as do other European countries, so check locally if you live elsewhere.

Multi-level decks on steeper plots

On a steep garden, two or three lower levels often look better than one tall platform. A common layout puts a seating or dining level near the house, with the hot tub level a few steps down. Each level stays closer to the ground, which reduces the drops and the amount of guarding needed. Planning height is measured from the ground below each part, so check every level.

A split-level design with the tub on the lower level suits gardens that fall away from the house at a gradient of roughly 1:4 to 1:8. The slope itself can then screen the downhill side of the tub from view.

A stepped deck that follows the slope works best where the ground falls away from the house. Where the ground falls towards the house, surface water must be dealt with, for example with a drainage channel, so it does not collect under the deck or run towards the walls.

Drops of about 150-200 mm (about 6-8 in) between levels keep each change in height manageable and separate the zones clearly. A two-level layout with dining near the house and the tub level about 150-300 mm lower needs a combined area of roughly 4.9 m by 6.1 m (about 16 ft by 20 ft).

On a two-level deck, light the step between the dining level and the hot tub level well. The change in height is easy to miss when the deck is used after dark, so fit step or riser lights along the full width of the edge.

On a slope, the posts on the lower side are taller and carry more sideways force. They need deeper footings to resist ground movement, so ask your engineer or builder to size them for your soil.

What is a partly sunken hot tub deck?

A partly sunken design sets the tub into the ground by part of its height and builds a deck level with, or just below, its rim. You get a built-in look without the work and risk of sinking the whole tub.

It suits flat gardens where a full-height cabinet would look bulky. Lowering the tub reduces the step-in height, which helps children and older bathers, and makes the tub less visible from neighbouring windows.

A step-down option sets the tub about 300-450 mm (12-18 in) below the main deck surface, reached by one wide step. This gives a sunken look with much less digging than a fully flush install.

Practical points for partly sunken decks

• Drainage: the pit collects rainwater, so it needs a free-draining base such as gravel over a soakaway or a connection to a drain, otherwise the cabinet sits in standing water
• Retaining edge: the soil around the pit needs holding back with a block or treated timber wall, not just the deck frame
• Slab: the tub still needs a level, solid slab at the bottom of the pit
• Buried services: check for cables, water pipes and drains before you dig
• Cover: leave room behind the tub for the lid lifter to swing and the cover to rest
• Pit size: for a flush or deeply sunken tub, dig the pit about 300-450 mm (about 12-18 in) larger than the tub on every side, so there is room to work on it without lifting it out
• Pit lining: for a flush or deeply sunken tub, line the sides of the pit with a waterproof membrane so wet soil is kept off the cabinet
• Ground conditions: sinking a tub only suits sites with a low water table and free-draining soil; on high groundwater or heavy clay, a sump in the pit may be needed to stop water rising around the cabinet
• Surface water: a tub set into the ground with paving at ground level picks up surface water from the garden, so a French drain around the perimeter is strongly advised
• Step edge: where the tub sits a step down from the main deck, mark and light the edge of that step clearly to prevent trips at night

The deeper the tub goes, the more these points matter. Our guide to sunken hot tubs and how to sink one properly covers pit depth, drainage and edging in more detail.

How do you build a wraparound deck with built-in steps?

A wraparound deck surrounds the tub on two, three or all four sides. The tub sits on its own slab and the deck is built independently around it, close to the cabinet but not touching or supporting it. You get a finished, built-in look with space to sit, put down a drink and dry off.

Built-in steps lead from the deck surface to the rim. A wide flight of two or three treads also works as a bench and a place to rest a towel, which saves space on smaller decks.

A built-in bench can also run along one side of the tub. It gives permanent seating and doubles as a step up to the rim, so build it to the same rise as your other steps and keep it clear of any service panel.

How to get the steps right

1. Measure the height from the finished deck surface to the top of the hot tub rim, with the cover removed.
2. Divide that height into equal steps. A comfortable outdoor rise is about 150-180 mm (6-7 in), and every step should be exactly the same height.
3. Make each tread deep enough for a whole foot, ideally at least 280 mm (11 in) from front to back.
4. Use grooved or anti-slip boards, or fit anti-slip inserts, because wet feet slip easily on smooth timber.
5. Fit a grab rail or sturdy post near the top step so bathers have something to hold when getting in and out.
6. Check that the steps do not block the lid lifter, the folded cover or any access panel.

How much space does a wraparound deck need?

Leave room for a lounging area beyond the tub itself. As a rough guide, a deck of about 4.3 m by 4.3 m (about 14 ft by 14 ft) fits a typical tub plus a hammock stand or a pair of loungers.

A compact square platform should allow a walkway of about 600 mm (about 2 ft) on each accessible side of the tub. If there is no room for chairs on the deck, place them on an adjoining paved area instead.

A compact square platform for a typical tub plus a 600 mm walkway needs about 3 m by 3 m (about 10 ft by 10 ft). It is the most structurally efficient layout, because the heavy framing is confined to a small area.

Ideas for small gardens and corners

In a small garden, a corner layout often works best. Set the tub on its slab in the corner and build an L-shaped deck along the two open sides, with steps on one face. This gives a neat finish with very little decking.

A corner position also gives you two sides of screening straight away from the existing fences, walls or hedges on the boundary. You then only need to screen the open sides, so less built screening is needed.

A corner layout can fit in an area of roughly 3.7 m by 3.7 m (about 12 ft by 12 ft). Extend one arm of the L by about 1.8-2.4 m (about 6-8 ft) to give a small seating space.

A corner can trap rainwater against the fences or walls. Give the deck and the ground beneath it a fall away from the corner, or fit a drain there, so water does not pool.

Before you commit to a corner, check which side the equipment bay is on. If it would face a wall or fence, you will need to leave a service gap there or turn the tub. For more ways to use a tight space, see our patio hot tub ideas, from layout to lighting, many of which work just as well with decking.

How do you keep a hot tub deck dry and draining?

Splashes, rain, wet feet and draining the tub mean a hot tub deck gets wetter than most. Timber that stays damp will rot, and water trapped under the tub can damage the cabinet and the base.

• Leave gaps between deck boards, commonly around 5-6 mm, or follow the board manufacturer's guidance
• Lay a weed membrane and gravel under the deck so water can drain and soak away
• Give the ground or slab underneath a slight fall away from the house
• Plan where drain-down water will go, such as a suitable drain, well away from foundations
• Leave a small air gap between the deck and the tub cabinet so wet timber does not sit against it
• Where a deck meets the house, keep it below the damp-proof course and never bridge it
• Give the deck surface a fall of at least about 1:100 (10 mm per metre, about 1/8 in per foot) away from the tub so splash water runs off rather than pooling
• If screens or walls partly enclose the deck area, fit a floor drain so water has a way out

Paving laid around a hot tub can settle over time. Check its level once a year and re-bed any slabs that have moved, because a sunken slab collects water and can become a trip hazard.

Should you choose timber or composite decking?

Both can work well around a hot tub, with different trade-offs. The right choice depends on your budget, how much upkeep you are happy with and how much shade the area gets.

• Treated softwood: lowest cost and easy to cut or repair, but needs regular cleaning and treatment, and can turn slippery with algae
• Hardwood: more durable and stable, but costs more and still needs cleaning and oiling
• Composite: resists rot and needs less upkeep, but some boards need closer joist spacing and can be slippery when wet, so check the manufacturer's guidance
• Frame: whatever boards you choose, the joists and posts are usually treated timber, so the frame still needs drainage and airflow
• Western red cedar: naturally durable with a warm look, but needs sealing about once a year to keep its colour and protection
• PVC: resists moisture very well and needs very little upkeep, which suits the wettest areas next to the tub

Composite boards resist the mix of splashed water, sanitiser such as chlorine and UV sunlight that gradually degrades natural timber around a hot tub. This is one of the main reasons they are popular for tub surrounds.

Applying a water-repellent preservative to treated timber reduces how much moisture it takes up. In the damp conditions around a hot tub, this helps the deck last longer.

How long does each decking material last?

These are typical figures for comparison. Real life depends on the product, how it is installed and how well it is looked after, so check the manufacturer's guidance and warranty.

• Treated softwood: about 15-20 years
• Western red cedar: about 20-25 years
• Composite: about 25-30 years
• PVC: about 20-30 years
• Dense hardwoods such as ipe: about 30-40 years

Rinse off any spills of hot tub chemicals straight away. Store chemical containers in a cool, dry, locked place rather than on the deck, where sun and rain can damage them.

How do you keep the access panels clear for servicing?

This is the point most deck plans miss. The pump, heater, control box and plumbing sit behind removable panels in the cabinet. A technician needs to take those panels off completely and kneel in front of them to work.

Many manufacturers ask for clear access on at least the equipment side, and some recommend access on every side because leaks can happen anywhere in the plumbing. The required clearance varies between models, so check the installation section of your manual.

• Mark the equipment side on your plan before the deck is designed
• Never build steps, benches or planters permanently across a service panel
• Use lift-out deck sections or hinged hatches over panels on sunken or flush designs
• Where the tub is fully built into the deck surround, plan two separate access hatches, one over the pump and heater and one over the control box, rather than relying on a single opening
• Make hatches easy to open without special tools, and use stainless steel fixings
• Leave room to remove each cabinet panel fully, not just loosen it
• Allow a route for the whole tub to be lifted out one day
• Make any access hatch or lift-out section at least about 450 mm by 450 mm (about 18 in by 18 in), and larger if needed to take the cabinet panel off completely

That last point is easy to forget. If the tub ever needs replacing, a deck built tightly around it may have to be partly taken apart. Our guide on how to remove a hot tub from a deck shows what that involves.

Electrics and the deck

A hot tub needs its own electrical supply, installed to BS 7671 with RCD protection and a local isolator, by a registered electrician. In England and Wales, a new circuit is notifiable work under Part P of the Building Regulations. Other countries have their own rules, so use a qualified local electrician if you live outside the UK.

Agree the cable route with your electrician before the deck goes down. The cable needs a protected route where nobody will screw or drill through it, and the isolator must be within reach but not reachable from inside the tub. Your electrician will confirm the correct position.

If the cable is run after the deck is finished, it often ends up in surface trunking across the boards. This looks poor and creates a trip hazard, which is another reason to plan the route first.

Before lifting any deck board or service panel near the hot tub, switch off at the isolator. If you see signs of water reaching electrical parts, leave the power off and call a registered electrician. The Electrical Safety First charity has clear advice on electrical safety at home.

How can you add privacy, shelter and lighting to the deck?

A deck gives you a ready frame for screens and overhead cover, as long as they are planned with the structure. Fence and screen heights are covered by planning rules too, so check before adding anything tall to a raised deck.

How do you block the wind around a hot tub?

In exposed gardens, wind cools the water surface and makes the walk to the tub unpleasant. Slatted screens often work better than solid ones because they slow the wind rather than forcing it over the top in gusts. Hedging, tall plants in planters and climbers on trellis do a similar job and soften the look.

Work out the direction of the prevailing wind and put your first screen on that side. Sheltering the water reduces heat loss, so the heater works less and running costs fall.

Alongside wind screening, a well-fitting, well-insulated hot tub cover is one of the most effective ways to cut heat loss and running costs on an exposed deck. Keep it on whenever the tub is not in use, and replace it if it becomes waterlogged or no longer seals at the edges.

In very windy spots, sturdy timber or composite screens stand up better than bamboo panels. Leave gaps of about 25-50 mm (about 1-2 in) between slats: this blocks most sightlines while letting air through and avoids a solid, closed-in look.

Which screening options suit a hot tub deck?

• Bamboo panels fixed to fence posts, for a light look in sheltered gardens
• Composite panels on aluminium posts, which need almost no upkeep
• A gabion wall of stone-filled mesh about 0.9-1.2 m (about 3-4 ft) high, which is heavy and stable
• A trellis with climbers: jasmine and hops can form a dense living screen within about two growing seasons, though hops die back each winter, and climbing hydrangea is slower to start but very dense once established
• Ready-made lattice panels planted with ivy or climbing hydrangea, a low-cost and widely available option that can be put up in an afternoon; ivy fills in faster than most climbers
• Large plants in movable planters along the deck edge, which form a green screen without a permanent fence and can be moved around with the seasons, something a fixed screen cannot do
• Existing garden features such as a rockery, mature shrubs or a slope, which can screen one side and reduce the need for built screens
• An existing fence as the back of a corner layout, if it is sound and at least about 1.5 m (about 5 ft) tall

Privacy and wind screens beside a hot tub are typically about 1.8 m (6 ft) tall. In England, fences and screens over 2 m high, or over 1 m next to a road, usually need planning permission. On a raised deck, the height is usually measured from the ground, so a screen on top of the deck needs planning permission if the combined height exceeds these limits.

A thick screen of leaves can also soften noise a little. Before fixing anything to a boundary fence, check who owns it, and get your neighbour's agreement before attaching screens, trellis or lighting.

Pergolas and overhead cover

• Leave enough height for the lid lifter and the open cover
• Keep good airflow, as a fully enclosed roof traps steam and condensation
• Set pergola posts on their own footings, not just fixed to deck boards
• Consider a partly open roof or retractable canopy to keep off rain without full shade
• Direct gutters and roof run-off away from the tub and its electrics
• Make the pergola extend about 600 mm beyond the tub on each side, which usually looks balanced
• Wisteria and Virginia creeper both suit shading a pergola over the tub, provided the extra weight of the mature plant is allowed for in the pergola's design
• Allow for plant weight: climbers get heavier as they mature, and a large wisteria can add well over 100 kg (about 220 lb), so include it in the pergola's design
• Choose deciduous climbers if you want shade in summer and sun through the roof in winter

Which overhead cover keeps the rain off?

• Adjustable louvred roof: keeps bathers dry in steady rain and can be opened for sun and steam
• Solid-roofed gazebo: the most weather protection, often sold as a kit around 3 m or 3.6 m square (about 10 ft or 12 ft), but it needs its own footings and open sides for ventilation
• Open pergola: gives shade and a sense of shelter, but only protects from light drizzle
• Thatched-roof shelter: made with fire-retardant synthetic thatch, it frames the space, takes string lights and keeps light rain off without fully enclosing the tub
• Shade sail: the cheapest overhead option, protects only from light drizzle and can be taken down for winter

In a south-facing garden that becomes a sun trap, plan shade over the tub, such as a shade sail or a louvred roof. This keeps the deck comfortable to use on hot summer afternoons.

Our article on hot tub privacy ideas for UK gardens has more on screens, planting and keeping neighbours happy.

Lighting and finishing touches

Low-level step lights and strip lights under the deck edge make the area safer at night without lighting up the whole garden. Use fittings rated for outdoor use, and have any mains-powered lighting installed by a registered electrician. Planters, hooks and storage finish the space, but keep them clear of the service panels.

• Light the whole route from the house door to the tub, not just the deck steps, because a hot tub deck is mostly used after dark
• Low-voltage LED step and riser lights, run from an outdoor-rated transformer, are an affordable way to light steps safely
• Weatherproof festoon or string lights in warm white of about 2700 K give a soft atmosphere over the deck after dark
• Dark boards paired with warm-white edge lighting make the lit tub the focal point at night
• A bed of ornamental grasses, lavender or hostas along the deck edge softens the join with the garden and makes a new deck look established

Never use open flames such as torches, candles or fire pits near the tub or where hot tub chemicals are stored. Use electric or battery-powered lights instead.

What are the most common hot tub deck mistakes?

• Putting a filled tub on a standard garden deck that was never designed for the load
• Assuming planning permission or building control sign-off means the frame has been checked for the tub's weight
• Boxing the tub in so tightly that the panels cannot be removed
• Forgetting drainage under a sunken or partly sunken tub
• Building steps of uneven height, or using smooth boards that become slippery
• Building a raised deck without checking planning rules or overlooking
• Having no plan for drain-down water, the cable route or future removal of the tub
• Fixing a deck to the house in a way that bridges the damp-proof course

Summary: planning a hot tub deck that lasts

The best hot tub decks look built-in but work as two separate parts: a solid base for the tub and a deck for people. Choose a raised deck for a slope, a partly sunken one for a lower profile, or a wraparound with built-in steps for a finished look.

Whichever design you choose, get the weight checked, give water a way out and keep every service panel reachable. Do those three things and your deck will be safer to use and much easier to look after.

Frequently asked questions

Can I put a hot tub on decking that is already built?

Only if the deck was designed for that load, and most garden decks are not. A filled tub puts far more weight on the frame than an ordinary deck is built to carry. Ask a structural engineer to inspect the joists, footings and fixings. Often the simpler answer is to cut out a section, lay a concrete slab and build the deck around the tub.

Can I put a hot tub on pavers or paving slabs?

Yes, if the slabs are laid level and firmly bedded on a properly compacted sub-base. Slabs laid on sand alone can sink or rock under the weight, which strains the shell. Check your manual, as some manufacturers specify a concrete slab. A paved or concrete base can sit flush with a surrounding deck for a neat finish.

How high should a hot tub deck be?

There is no single right height. A deck level with the rim, or slightly below it, lets you sit on the edge and swing your legs in, which many people find easiest. In England, raised decks more than 300 mm above the ground usually need planning permission. If you need steps, make every step the same height.

Do I need building regulations approval for a hot tub deck?

A simple garden deck often does not need approval on its own, but the electrical work does, because a new circuit is notifiable under Part P in England and Wales. A raised deck may need guarding, and a deck fixed to the house must not bridge the damp-proof course. Planning permission is a separate question. Your local building control team can advise.

What decking is least slippery around a hot tub?

Grooved timber and textured composite boards both help, but any surface can become slippery with algae, moss or soap residue. Look for boards that state an anti-slip rating, consider anti-slip inserts on the steps, and clean the deck regularly with a suitable deck cleaner. A non-slip mat by the steps adds extra grip where feet are wettest.

How much space should I leave around a hot tub on a deck?

Leave enough room to remove every service panel completely and kneel in front of it, plus space behind the tub for the lid lifter and cover. Required clearances vary between models, so read the installation section of your manual. Where the deck has to sit close to the cabinet, use lift-out boards so the space can be opened when needed.