How Long Does a DIY Hot Tub Build Take? A Real-Life Case Study

Last updated: September 2026

One of the most common questions I get, probably every week, is: how long will my project take? I wish the answer were straightforward, but it’s usually it depends. It’s not what most people want to hear, but the timeline for any build varies hugely with how much time you can give it, how complex the project is, and whether you have help.

On average, most of my customers complete their builds in about four months from start to finish. Some stand out, though, like Mark’s custom hot tub build, which ran for more than two years. Mark’s story shows how different factors affect a timeline, and I’m sharing it to help you answer that question for your own build.

Mark’s build timeline

When	What happened
Late 2022	Custom design drawn up. Winter arrived, so Mark built a bar instead.
April 2023	Work restarted with the footwell, then paused for other commitments.
May 2023	Walls and lower plumbing. Remaining parts ordered, aiming for Christmas 2023.
December 2023	Good progress, including tiling, but winter slowed things again.
Summer 2024	Much of the plumbing done and the area backfilled with concrete.
Late 2024	Most plumbing and backfilling complete. Next up: the control room, aiming for Christmas 2024.

The beginning: late 2022

Mark first contacted me in 2022 to design a custom-built hot tub for his backyard. Below is the initial design I created for him. If you’re wondering what that involves, I’ve explained it in the custom hot tub design process.

Mark was excited to get started, but the timing wasn’t ideal. By late November, when he was ready to begin, winter had set in and working outdoors was a challenge. Instead, Mark turned his attention to building a bar, and it turned out amazing.

Spring 2023: progress resumes

After a break over the colder months, Mark got going again in April 2023 as the weather improved. His first big milestone was building the footwell of the hot tub. Then life got in the way again, and he had to pause for other commitments.

By May 2023 Mark was back at it, this time on the hot tub walls and the lower plumbing. Things moved along smoothly, and at this stage he ordered the rest of the supplies for his build from me. The push was on, and his goal was to finish by Christmas 2023. For how the walls and plumbing come together, see hot tub wall construction options and DIY hot tub plumbing.

Winter 2023: more delays

Unfortunately, the Christmas deadline came and went. By 18 December 2023 Mark had made significant progress, but winter brought yet more delays, and despite his best efforts, outdoor work slowed right down.

The eagle-eyed among you will notice that Mark is actually tiling the interior before he cuts the holes for the jets. He thought it would be easier that way. I’m still not sure, to be honest, but it’s working for him. If you’re at that stage, my guides to hot tub tiles and installing jet bodies are worth a read.

Summer 2024: significant progress

With the warmer weather back, Mark picked up the pace in summer 2024. He completed a large part of the plumbing and backfilled the area with concrete. The progress was promising, but there was still work to do.

Late 2024: nearing completion

In late 2024 Mark got in touch with renewed determination to finish by Christmas 2024. By then most of the plumbing and backfilling was done, and the next big step was installing the control room. (If you’re at that point too, read hot tub control room design considerations.)

Mark was closer than ever to achieving his vision, and we were all rooting for him to hit that deadline. Thanks, Mark, for all the pictures. Keep it going, sir!

The takeaway: what affects how long a build takes

Mark’s journey shows how much DIY timelines vary with time available, weather and other commitments. While the average hot tub build takes around four months, larger or more intricate projects can take much longer, especially when life throws curveballs. The things that make the biggest difference are:

• How much time you can give it. Evenings and weekends add up, but slowly.
• The season. Concrete, render and tiling all need reasonable temperatures, so plan the outdoor work for the warmer months.
• The complexity. Curves, extra features, water features and lots of jets all add time.
• Help. A second pair of hands, or trades for the dig and the concrete, speeds things up.
• Planning up front. Having the design, plumbing layout and parts list sorted before you start avoids stop-start delays waiting for decisions or parts.

For a checklist of the decisions to make before you start, see planning a DIY hot tub in 2026 and I want to build a hot tub: where do I start? And to see how long the groundwork alone took me, read my DIY in-ground hot tub build guide.

Planning your own build?

The quickest builds are the ones where everything is worked out before the first spade goes in. My DIY hot tub plans give you the CAD drawings, the plumbing layout, a full parts list and the video course. If you want something custom like Mark’s, I can draw it up as architectural CAD and a 3D plumbing design.

FAQs

How long does it take to build a DIY hot tub?

Most of my customers finish in about four months from start to finish. Bigger, more intricate builds, or ones fitted around work, family and the weather, can take much longer. Mark’s ran for over two years.

What’s the best time of year to start?

Aim to have the dig, concrete and outdoor finishing done in the warmer months. Mark lost time in both winters because outdoor work slowed right down in the cold.

Can I build a hot tub in stages?

Yes. Mark worked in phases: footwell, walls and lower plumbing, tiling, backfill, then the control room. Just make sure open pipework is capped off and protected between stages.

How can I speed up my build?

Get the design and parts sorted before you start, get help for the heavy work, and plan around the weather.

How long is your build taking, or how long are you planning for? Let me know in the comments below or on the YouTube video. I read them all.

Cheers,
Andi

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Thanks - Andi

 

Hi, Andi here. I own Buildahottub.com and also write all of the articles and info pages on the site. Some years back now, I built my own hot tub but struggled to find the information I needed. So, once my tub was complete, I started this website to help others in their own pursuit of hot tub and plunge pools DIY building information.

Fast forward to 2025, I've helped over 1400+ DIY customers just like you all over the world build hot tubs and pools. Have a good look around the site, there are lots of resources here. Please do get in touch if I can help you. - Cheers, Andi