Hot Tub Installation: What Can Go Wrong, and How We Handle It
Installation is the part most buyers think least about and the part that causes the most last-minute stress. It is also the part where we can do the most to help, if you let us in early.
This guide covers everything from access and groundwork to cranes and electrics. Some of it might sound like a lot. Good. We would rather you read this now than find out on delivery day that the gate is two centimetres too narrow.
The honest position: installation is real work. We do not pretend otherwise. But it is our work, not yours. You prepare the base and sort the electrics. We handle everything else.
The First Thing We Ask: Can We Actually Get It There?
Before anything else, we think about access. A hot tub is a large, heavy object. Most models weigh between 250kg and 500kg empty, and the shell itself is often two metres wide or more. It cannot be tipped, squeezed, or disassembled at the gate.
The minimum side gate width for most hot tubs is 80cm, and that is snug. Some larger models need 90cm or more. If your gate is 76cm wide, we need to know that upfront, not when the delivery lorry is parked outside.
Common access questions we work through:
- Is there a side gate, and how wide is it?
- Can a fence panel be removed temporarily? (Often the simplest solution.)
- Is neighbour access possible if the gap is on a shared boundary?
- Are there steps, slopes, or narrow passages between the gate and the final position?
- Is there overhead clearance for a crane if needed?
None of these are unusual problems. We have dealt with all of them many times. The only bad version is finding out too late.
The Site Visit: Free, and Worth Doing
Before delivery, we visit. We measure access, check levels, look at the planned position, and work out whether anything needs to change. This is included as standard. It costs you nothing and it saves problems on the day.
The site visit is also when we talk through base requirements for your specific model and confirm the electrical supply situation. By the end of it, there should be no surprises on installation day.
Some buyers skip this and ask us to go straight to delivery. We understand the impulse. But we have never regretted doing a site visit and we have occasionally regretted skipping one. We will always recommend it.
The Base: Get This Right First
A hot tub filled with water is extremely heavy. A 6-person tub holding 1,200 litres of water weighs roughly 1,500kg in total. That weight needs to sit on something that will not move, settle unevenly, or crack over time.
The two options that work reliably:
Reinforced concrete slab
This is the most common and most straightforward solution. The slab needs to be at least 100mm thick and reinforced. It should be level to within a few millimetres. We will advise on the exact dimensions and spec for your chosen model before you book a contractor.
Compacted MOT Type 1
A well-compacted Type 1 sub-base can work for some models, particularly lighter ones. We will confirm whether this is suitable in your case.
What about decking?
Standard garden decking is not strong enough for most hot tubs without significant reinforcement underneath. If you have existing decking and want the tub to sit on it, a structural engineer or builder needs to assess it first. It is not impossible, but it needs doing properly. We have seen decking deflect under the load years after install, which is not a good situation.
If you are planning a new deck specifically for the hot tub, build it to carry the weight from the start. We can advise on what that means for your chosen model.
Electrics: Not a DIY Job
Every acrylic hot tub needs a dedicated electrical supply. The exact requirement depends on the model:
- Smaller plug-and-play tubs: 13A supply (standard socket, but ideally a dedicated circuit)
- Mid-range models: 20A dedicated supply
- Larger tubs and swim spas: 32A dedicated supply
This supply needs to be installed by a qualified electrician and signed off to Part P building regulations. It is not optional and it is not something to work around. Hot water, electricity, and people are a combination that requires the work to be done correctly.
We will tell you exactly what your chosen model needs before you buy. If you do not already have a trusted electrician, we can recommend people locally who know the requirements and do this kind of work regularly.
One practical note: the electrical supply needs to be ready before we commission the tub. If it is not ready on installation day, we can still deliver and connect, but we cannot run the commissioning process. That means a second visit. It is not the end of the world, but it adds time. Sort the electrics first.
When a Crane Is the Right Answer
Some gardens cannot be reached by walking a tub through a gate. The site might be behind a garage block, up a bank, surrounded by mature planting, or simply too far from any access point for a hand-carry to be practical or safe.
In those cases, a crane is the right tool. It is not unusual. We use cranes on a reasonable number of installs each year.
The cost is typically between £300 and £800, depending on the complexity of the lift, the size of the crane required, and how far the tub needs to travel. We organise this. You do not need to find a crane company or manage the booking. We bring it in as part of the job, and the price is quoted to you upfront so there are no surprises.
Crane lifts do require some planning around overhead cables, trees, and access for the crane lorry itself. The site visit covers all of this. If a crane is going to be needed, we know before delivery day, not on it.
Treetops: One of Our More Memorable Installs
We have done a lot of installations across Hampshire over the years. Some are straightforward. Some are not. Treetops sits firmly in the second category, and it is worth telling properly because it shows what careful planning can achieve when the conditions are genuinely difficult.
The site visit showed that the chosen location was several metres further than our largest crane could reach, up a hill, over a moat. Standard approach would not work. So we constructed a scaffolding platform next to the location, positioned so the crane could drop the tub close, and the team could manoeuvre it the rest of the way on foot. From reversing the crane over the moat, to lifting the tub over the garages and up the hill onto the platform, the whole job was meticulously planned and executed without a hitch.
It was a beautiful setting. We even caught deer playing in the sunset when we went back to collect the time-lapse camera.
There is a video of the Treetops install. You can watch it on our homepage or on our YouTube channel. It is worth a few minutes of your time, not because it will happen to you (it almost certainly won’t), but because it shows what the team is actually capable of when the job calls for it.
The point of telling the Treetops story is not to impress you. The point is this: the problems that look impossible at first are usually just problems that need a plan. We have not yet found a site where we could not find a way.
What Can Actually Go Wrong, and What Happens When It Does
We said at the start that installation is real work. Part of treating you honestly is being clear about what can come up, even with a good site visit and careful planning.
Access is tighter than expected
Occasionally, a garden is measured at 85cm clear and turns out to have a gate post that narrows it to 78cm. Or a fence panel that looked removable has been concreted in. These things happen. In most cases, we can solve it on the day: remove a panel, use the crane instead, take a different route. If the problem is serious enough to require rescheduling, we will tell you honestly and agree a new date. We do not try to force a delivery that will damage the tub or the property.
The base is not level
A slab that looks level by eye can be a centimetre or two out once we measure. Small discrepancies, we can handle on site using levelling feet or packing. Larger ones need the base to be adjusted before we can position the tub properly. Again, the site visit catches most of these. But if we find a significant level problem on the day, we would rather tell you and sort it properly than set the tub down on a surface that will cause problems later.
Electrics are not ready
This is the most common delay. The tub arrives, the base is perfect, access is fine, but the electrical supply has not been installed yet. We can still deliver the tub and connect the plumbing. We cannot commission it or fill it until the supply is live and signed off. If this happens, we book a return visit for commissioning. It adds a week or two. It is avoidable if the electrics are sorted before delivery day, which is why we mention it early and often.
Timeline: What to Expect
From placing an order to the tub being commissioned and ready to use, the typical timeline is two to four weeks. The variables are stock availability, base preparation, and electrical installation.
On delivery day itself:
- The delivery and positioning take between one and three hours, depending on access complexity
- The handover takes roughly an hour: we fill the tub, run through the controls, show you how to balance the water chemistry, and answer any questions
- By the time we leave, you should be able to run the tub without needing to call us
If a crane lift is involved, allow a little more time. Crane work is methodical and the team does not rush it.
How to Make Installation Go Smoothly
Most installations are straightforward. The ones that are not are usually straightforward to fix if we have good information early. Here is what helps:
- Accept the site visit. It is free, it takes less than an hour, and it resolves the questions that would otherwise become problems.
- Sort the base before delivery. Concrete needs time to cure. Book your groundwork contractor early, not after you have confirmed the delivery date.
- Get the electrics booked as soon as you know which model you are ordering. Electricians are busy. Leaving this until after delivery is a common reason for commissioning delays.
- Measure your access points and send us the numbers. Gate width, overhead clearance, any steps or narrow sections. We would rather have this information twice than not at all.
- Tell us about anything unusual. A difficult slope, a moat (yes, really), mature trees near the delivery path, restricted parking for the lorry. The more we know, the better we can plan.
The Short Version
Installation is not complicated when it is planned properly. The base, the access, and the electrics are the three things that cause the most delays, and all three are manageable with a bit of lead time.
We handle the delivery, the positioning, the crane if needed, and the commissioning. You handle the base and the electrical supply. We help you understand exactly what each of those requires before you book anything.
If you have a site that looks tricky, tell us about it. We will come and look, work out a plan, and give you an honest assessment of what it involves. That is what the site visit is for.
Call us, or come into the showroom. We have probably seen something similar before.