A backyard pool can be the ultimate spot for summer fun. As temperatures cool down, though, you might start wishing you had added a built-in spa during your pool build.
Maybe it wasn’t in the budget at the time, or you didn’t think you’d use it. Or perhaps you moved into a home with a basic in-ground pool but now crave a place to unwind at the end of the day or recover after a refreshing swim.
Some people assume adding a spa to an existing pool is a simple upgrade, while others make it seem like an impossible challenge. The truth? It is possible. However, there are important factors to consider.
Before you sign an agreement with contractors, take the time to understand the costs, challenges, and options available so you can make the best decision for your backyard and lifestyle.
Is it possible to add a hot tub to an existing pool?
Your backyard pool is a permanent structure — excavated, reinforced with rebar, and poured with concrete. Unlike a house, where you can build an addition, modifying an existing pool isn’t as simple as adding on.
Still, you might be wondering: Can I add a hot tub to my existing pool? A spa would upgrade your backyard, improve your relaxation routine, and offer therapeutic benefits.
The answer? Maybe. It depends on several factors, including the age and condition of your pool, available space, and what type of spa experience you’re looking for.
Built-in spa
Some pools aren’t designed to support the weight and structure of an integrated spa. The foundation might not be reinforced properly, leading to structural failure. Adding a built-in spa also requires significant renovations. You may have to drain the pool, while the builder modifies plumbing and potentially tears up your pool deck. It’s a gut job, and unexpected issues with your existing pool can make the project even more complicated.
Above-ground hot tub
Some pool builders offer an above-ground spa that connects to your pool’s plumbing, designed to match the aesthetics of your pool. While this is less invasive than a fully integrated spa, it still involves construction and typically has fewer features than a standalone hot tub.
Standalone hot tub
A portable hot tub, like one from Master Spas, might be the smarter solution. You can enjoy the benefits of hydrotherapy without major construction, plumbing modifications, or permits. Plus, portable hot tubs offer more powerful jets, better temperature control, and year-round usability.
The cost of adding a hot tub to an existing pool
Every home improvement project starts with a number in mind. Maybe you think a new front door will cost $1,000, or a bathroom renovation will run about $15,000. Then you get the actual quote, and it’s way higher than expected.
The same is often true when homeowners look into adding a hot tub to their existing pool. Many assume it’s a simple upgrade, only to be surprised by the complexity and cost.
Pool owners report that adding a built-in spa can range from $30,000 to $55,000 or more. The high price tag, which is almost as much as the original pool, often comes down to structural modifications and required upgrades. Contractors explain that integrating a spa into an existing pool isn’t just about adding a hot tub. It often means making significant changes to the pool itself.
To properly attach a spa, builders usually need to cut into the existing pool shell so that the two structures can be tied together. This process weakens the pool’s structure, requiring reinforcement and, in many cases, replastering and retiling the entire pool. Plumbing and electrical systems also need to be updated. If the pool was built with only one main drain, local codes may require adding a second drain or a new suction point for safety compliance.
The heating system is another major consideration. A spa needs to heat up quickly and maintain higher temperatures than a pool, which often means upgrading pool equipment such as heaters, pumps, and filtration systems to accommodate the additional demand. Running new gas lines or increasing electrical capacity can add thousands to the total cost.
Pros and cons of built-in vs. portable hot tubs
When you picture a luxury backyard, you might think of an in-ground pool with a built-in spa. Maybe it’s perfectly integrated into the design, with a round or square shape and a cascading waterfall feature.
If you’re considering adding a hot tub to your existing pool, this might be the vision you have in mind. But before committing to a built-in spa, it’s important to weigh your options.
Should you choose a built-in spa?
A built-in spa is designed to blend seamlessly with your pool, sharing the same filtration, heating, and control systems. While this integration can create a polished look, it also comes with significant downsides. The process can take months and leave your pool unusable during that time. And while built-in spas might have the look impressive, they often lack the jet power and insulation needed for true hydrotherapy and year-round comfort, especially in colder climates.
Standalone hot tub option
On the other hand, a portable hot tub offers a more practical alternative. Master Spas hot tubs deliver a more therapeutic experience with high-powered jets, ergonomic seating, and precise temperature control. Unlike a built-in spa, which relies on a pool heater that may struggle to maintain hot tub temperatures, a Master Spas hot tub is designed for efficient heating and consistent warmth, even in the winter.
Plus, installation is far simpler. There’s no need to drain your pool, modify plumbing, or secure permits. Once your site is ready, you can be soaking in warm, bubbling water within a day rather than waiting months. A Master Spas hot tub requires a dedicated space in your backyard and a solid, level foundation that can handle the weight of the hot tub when filled with water.
Choosing the right hot tub for your backyard pool
After a long, busy day, there’s nothing like sinking into a hot tub and letting the warm water work its magic on your tired muscles. If you’re dreaming of this kind of relaxation right in your own backyard, it’s important to choose the right hot tub to fit your needs. It’s not just about picking any hot tub. It’s about finding one that will provide comfort, healing, and enjoyment for you and your loved ones. Here’s what to consider when making your decision:
Size and seating
How many people will be using the hot tub regularly? Whether you’re looking for a cozy two-person spa or a larger model for the whole family, Master Spas offers a range of sizes to fit your space and lifestyle.
Jet placement and hydrotherapy
The placement of jets can make all the difference in how you relax. A well-designed hot tub targets key muscle groups to help ease tension and support recovery. Master Spas hot tubs feature adjustable massage jets that are strategically positioned for maximum hydrotherapy. With a variety of seating options, you can choose the perfect spot to enjoy the relief you need.
Energy efficiency
We know that keeping your energy bills in check is important. Look for a well-insulated spa with a high-quality cover to help maintain a comfortable water temperature without driving up your costs. Master Spas hot tubs feature full-foam insulation, which helps retain heat and protect the components of your spa. Not only does the insulation help reduce operating costs, it also allows you to use your hot tub year-round — something that can be hard to do with an integrated spa.
Ease of maintenance
The last thing you want is a complicated upkeep routine. Opt for a hot tub with an easy-to-use filtration and water care system that lets you focus on enjoying your spa instead of managing it. Master Spas has two water care options. Available for the Twilight and Michael Phelps hot tub lines, the Master Clear Salt System simplifies water care. The system automatically tests and sanitizes your water. For those who don’t want a saltwater hot tub, the EcoPur filtration system uses minerals like copper and zinc to purify the water. The EcoPur system is available on all Master Spas hot tubs.
How to buy a hot tub
Are you ready to add a hot tub to your backyard? Click here to discover our secrets to creating a backyard oasis. Or, contact your local Master Spas retailer to learn more about hot tub ownership. Wondering how much a hot tub costs? You can request a quote here.