5 Inground Spa Options and How to Choose the Right One for Your Yard

Can you add a spa to your backyard without building a full swimming pool? Yes. And you have more options than most Long Beach homeowners realize.

An in-ground spa sits flush with your patio, deck, or landscape. It looks like it belongs there. But this isn’t one single product. It’s actually five different build styles, each with its own cost range, setup process, and maintenance needs. Picking the wrong type for your yard can mean wasted money or a unit that doesn’t match how you actually want to use it.

We’ve worked on all five types across Long Beach, Seal Beach, and the surrounding area. This post breaks down each option so you can match the right in-ground hot tub to your property, your budget, and how your family plans to use it.

If you’re exploring options and want to talk through what fits your property, our team handles residential spa services in Long Beach and can help you sort through the details.

What Are the Different Types of In-Ground Spas?

The five main types are:

• Custom gunite – built on-site from concrete sprayed over a steel rebar frame. Fully customizable shape, size, and finish. Most durable option with the longest lifespan.
• Attached spillover – connected to a swimming pool with a shared water edge. Warm water flows from the raised soak into the pool below, creating a waterfall effect.
• Standalone – a custom-built unit set into the ground on its own without any swim area. Works well for smaller yards and limited outdoor space.
• Drop-in shell – a pre-manufactured acrylic shell set into an excavated vault or surface cutout. Factory jet systems and led lighting included.
• Spool (hybrid) – a compact structure combining heating and jets with a small wading or plunge area. Perfect for relaxation and hydrotherapy in a tight footprint.

Each type varies in cost, longevity, and how much you can customize the design. The right choice depends on your yard size, whether you have an existing pool, and how you plan to soak.

Spas are designed to last. According to industry estimates, a well-maintained built-in spa can serve your family for 20 years or more, depending on construction quality and upkeep. But the type you choose affects everything from operating costs to long-term upkeep.

Custom Gunite Builds Offer the Most Design Freedom

A gunite unit is built on-site using the same method as a concrete pool. Crews excavate the area, set a steel rebar framework, and spray a concrete mixture (gunite or shotcrete) over the frame. Once it hardens, the interior gets a finish like plaster, pebble aggregate, or tile.

This is the most customizable option you can build. You choose the shape, depth, seat layout, jet placement, and finish. Nothing is limited by a factory mold. Want a curved seating arrangement with a water feature that spills into a lounge area? A raised soak with a natural stone edge that adds sophistication to your backyard design? Gunite makes it possible. The aesthetic appeal of a custom build is hard to match with any prefab option.

It’s also the longest-lasting choice. With proper care and resurfacing every 10 to 15 years, a gunite structure can hold up for 20 years or more. Compared to fiberglass models or prefab alternatives, gunite delivers superior durability that justifies the higher price tag.

In our 15 years serving Long Beach, we’ve seen how coastal salt air along Belmont Shore and Naples can wear down certain plaster finishes faster than inland areas. Surface choice matters here. We work with NPT.com certified materials that carry lifetime warranties on the surface work, which gives local homeowner families extra protection against that coastal wear.

The tradeoff? Gunite costs more upfront and takes longer to complete. But for property owners planning a full outdoor remodel or building alongside a new fiberglass pool, this is the option that adds the most permanent value. Spas are the perfect addition to a larger living project when you want a cohesive look between your soaking area and swim area.

Attached Spillover Designs Connect Your Soak and Swim Areas

If you already have a pool, or you’re building one, an attached spillover setup is worth considering. This design places the spa at a slightly higher elevation. Heated water flows over a shared wall, creating a cascade that drops into the swim area below.

The two share plumbing and circulation. That means one filtration system handles both. But the equipment needs to be sized correctly for the combined water volume. An undersized pump or heater is one of the most common problems we see with spillover setups in the Long Beach area.

These designs look great. The visual effect of water cascading poolside creates a resort-style retreat. And in Southern California, where conditions stay warm enough for shared circulation most of the year-round season, this design is practical. Spas are often paired this way to create a seamless transition between soaking and swimming.

One thing to plan for: a spillover without a cover loses heat faster than an enclosed setup. The open edge means you’re constantly reheating and watching your water temperature drop. A variable speed pump can help offset that energy cost. According to the Department of Energy pump guidelines, your pump can be your home’s second-largest energy user, so efficiency matters.

This option works best for families who want both a swim area and a soak without running two separate systems. The spillover design can complement your existing layout and transform an ordinary setup into something that feels like a luxury retreat.

Freestanding Built-In Units Work Without a Swim Area

Not every yard needs a pool. And not every property owner wants one. A freestanding recessed unit gives you a custom structure set into the ground on its own, completely independent.

It has its own equipment pad with a dedicated pump, heater, filter, and control system. It operates on its own schedule and doesn’t share water with anything else. That gives you full control over temperature, chemical balance, and run times. You set it, and it’s ready when you want to unwind after a long day or soothe sore muscles on the weekend.

This option is ideal for smaller properties or those who want a soaking feature as the centerpiece of their patio area. A freestanding unit can be surrounded by hardscape, recessed into a patio, or tucked into a garden area with stone coping that creates a true backyard oasis. Many owners in established Long Beach neighborhoods pair a freestanding soak with custom design options like fire features or seating areas to create a full retreat.

Construction uses the same gunite or shotcrete method as a connected setup. You still get full control over shape, depth, seating, and finishes. The difference is just size and scope. It’s a smaller project with a faster build timeline. A good builder can complete most freestanding projects in less time than a full combo.

Drop-In Shells Combine Factory Features with a Built-In Look

A drop-in shell starts as a factory-built unit. It’s manufactured off-site with pre-installed jets, lighting, controls, and sometimes audio systems. Then it gets recessed into an excavated vault or set into your surface framing, so it gives you that sleek integrated feel without a full construction project.

The biggest advantage here? Jet count and advanced hydrotherapy performance. According to Bullfrog Spas, a typical gunite soak has 7 to 10 jets. A factory-built shell often comes with 30 or more, plus dedicated pump systems designed to power them. If therapeutic soaking and massage are your priorities, drop-in shells deliver more jet coverage per square foot. Many spa models from major manufacturers feature ergonomic seat designs shaped for specific muscle groups, which a custom gunite build can’t easily replicate.

Hot tubs offer this same factory-built approach, and the line between portable hot tubs and recessed drop-in shells has blurred. Some brands, including names like Aquatica Baths USA and others in the premium bathtubs market, now make shells designed specifically for recessed placement. You can even find swim spas and spas hot tubs built for partial or full below-grade positioning.

The equipment is self-contained and accessible from service panels on the exterior. That makes maintenance simpler than reaching plumbing buried underground in a gunite build. Any reputable dealer or builder can help you find the right shell for your space.

Cost is another factor. Drop-in shells generally cost less than custom gunite. But you’re giving up some design flexibility since you’re choosing from the manufacturer’s available shapes, sizes, and seat configurations.

One planning note: if you’re recessing a shell into the ground, your contractor needs to build in access for future equipment service. A removable grate or service panel around the perimeter keeps everything reachable. Without that planning, a simple pump replacement becomes a much bigger job.

Spools Give You a Soak and Small Swim Area in One

A spool, short for “spa plus pool,” is a compact structure that combines heating and jets with a small wading or plunge area. Spas swim and soak duties get handled in one unit. They’re typically 10 to 16 feet long, much smaller than a standard swimming pool but bigger than a freestanding soak.

Spools are built with the same gunite or shotcrete construction. They include bench seating, jets, a heater, and enough room for a round spa seating area on one end. But they also have enough open water for cooling off, light exercise, or letting kids splash around. Some owners use the heated end for soaking and the cooler end for wading. Others heat the entire spool and use it as an aquatic wellness space for relaxation.

This option has been growing in popularity across Long Beach, and we see why. Many established neighborhoods like Bixby Knolls and Los Altos have smaller lots where a full-size swim area doesn’t fit. A spool gives property owners water features with real functionality without requiring a large footprint. It’s a stylish, long-lasting solution that blends seamlessly into a tighter yard layout.

The soaking end is perfect for recovery after an intense workout or a long week.

The cost sits between a freestanding soak and a full swim area. You’re getting more water volume and versatility than a traditional spa alone, but at a fraction of the price and maintenance commitment.

How to Pick the Right Option for Your Yard

With five choices, the decision comes down to a few factors. Here’s how to narrow it down.

Yard Size and Layout

If your lot is small, a freestanding unit or spool makes more sense than a spillover that requires a full swim area. Larger properties with room for swimming pools and a connected soak open up the attached spillover or custom gunite paired with construction services in Long Beach.

Budget Range

Drop-in shells are generally the most affordable recessed option. Custom gunite carries the highest price tag. Spools fall in the middle. During our consultation, we walk property owners through the numbers so there aren’t surprises later.

How You’ll Use It

Focused on jet performance and comfort? A drop-in shell gives you the most jets per dollar. Want a luxurious showpiece? Custom gunite can’t be beat. Need the flexibility of both a soak and a splash zone? Look at a spool. Spa offers something for every use case when you match the type to your actual habits.

Existing Setup or New Build.

If you already have a swim area, an attached spillover is often the most cost-effective way to add a soak. Starting from scratch? You can choose any of the five types. A skilled builder can help you decide which type will compliment your property’s layout best.

Energy Costs

Every recessed soak needs a pump, heater, and filter. Variable speed pumps can cut your energy bills by a wide margin. ENERGY STAR certified pumps use up to 70% less energy than conventional single-speed models. We handle both Jandy and Pentair variable speed systems and can size the right one for whichever type you choose.

Lifespan

Custom gunite and spools can last 20 or more years with proper maintenance. Drop-in shells typically last 10 to 20 years depending on shell quality and care. Both depend on how well you maintain water chemistry and equipment.

Cost estimates are approximate and vary based on region, design complexity, materials, and local labor rates. These ranges reflect general industry pricing as of 2025 and should be used as a starting point, not a firm quote. Contact a licensed contractor for accurate project pricing.

The right spa is the one that fits your yard, your budget, and the way your family actually uses it. Whether you want a custom centerpiece or a practical drop-in for nightly soaking, there’s an option that works. If you’d like help figuring that out, give us a call at (562) 522-2203 or schedule a consultation with our Long Beach team. We’ll walk through your space, explain the pros and cons for your specific situation, and help you make an informed decision.

FAQs About Inground Spa Option

Q: What are the main types of inground spa options available for my backyard?

A: The five primary inground spa options include built-in spas integrated with swimming pools, standalone in-ground hot tubs, swim spas that combine exercise and relaxation, spillover spas that connect to your pool, and custom fiberglass or acrylic spa models. Each option offers unique benefits for creating a luxury backyard oasis, from therapeutic hydrotherapy jets to year-round wellness features that complement your outdoor space.

Q: How does an in-ground spa differ from portable hot tubs?

A: An in-ground spa provides a permanent, built-in look that seamlessly integrates with your landscape and pool area, while portable hot tubs sit above ground and can be relocated. In-ground options offer superior aesthetic appeal, better insulation for energy efficiency, and can be customized with premium features like LED lighting, water features, and ergonomic seating. The installation process requires professional builders but creates a cohesive backyard design that enhances your property value.

Q: What should I consider when choosing between swim spas and traditional spa models?

A: Swim spas offer dual functionality with powerful jets for swimming against a current plus hydrotherapy relaxation zones, making them ideal for fitness and wellness. Traditional spa models focus solely on relaxation with therapeutic jet configurations and lounge seating. Consider your backyard space, budget, and whether you want exercise capabilities or purely a retreat for unwinding. Swim spas require more installation space but transform your outdoor area into a comprehensive aquatic fitness and relaxation center.

Q: How much does installation of a built-in spa typically cost?

A: Built-in spa installation costs vary significantly based on size, materials, and features. A basic in-ground hot tub with standard jets and seating starts around $10,000-$15,000, while luxury spa models with premium features like LED lighting, multiple jet configurations, and high-end finishes can range from $25,000-$50,000 or more. When paired with pool construction, the combined project offers cost savings. Always work with an experienced builder or dealer to get accurate estimates for your specific backyard design.

Q: What are the benefits of an inground spillover spa connected to my pool?

A: An inground spillover spa creates a stunning visual aesthetic where heated spa water cascades into your pool, serving as an elegant water feature. This built-in design maximizes poolside space efficiency, shares filtration and heating systems for cost savings, and allows you to easily transition between warm hydrotherapy and cool swimming. The spillover effect adds a luxury resort feel to your backyard while providing therapeutic benefits and year-round relaxation options.

Q: Which spa material is best: fiberglass, acrylic, or concrete?

A: Fiberglass pool and spa shells offer quick installation, smooth surfaces, and low maintenance with durable gel-coat finishes. Acrylic spas provide excellent heat retention, ergonomic seat molding, and come in various spa models with built-in features. Concrete or gunite allows complete customization to match your backyard design but requires longer installation time and more maintenance. Fiberglass and acrylic are popular for standalone in-ground hot tubs, while concrete works best for fully integrated built-in spa designs that complement swimming pools.

Q: How do I choose the right spa size and jet configuration for my needs?

A: Consider how many people will typically use your spa, range from 2-seat intimate models to 8+ seat party spas. Evaluate jet placement for targeting specific muscle groups; therapeutic configurations focus on back, neck, and leg hydrotherapy, while relaxation models offer gentle, full-body massage. Round spa designs provide social seating, while lounge-style models let you recline fully. Test different spa offers at a dealer showroom to experience seat comfort and jet pressure before making your decision.

Q: What ongoing maintenance does an in-ground spa require?

A: In-ground spas require regular water testing and chemical balancing, filter cleaning every 2-4 weeks, and occasional draining for deep cleaning. Built-in look installations that pair with your pool may share filtration systems, simplifying maintenance. Premium spa models often include automated sanitization systems and covers to reduce debris. Budget for annual professional inspections of heating elements, jets, and pumps to ensure your spa continues to provide year-round relaxation and soothe muscles effectively. Proper maintenance protects your investment and ensures optimal hydrotherapy benefits.

Q: Can I install an inground spa if I don’t have a swimming pool?

A: Absolutely! Standalone in-ground hot tubs create a beautiful backyard retreat without requiring a pool. These installations can transform any outdoor space into a private wellness oasis with luxury features like LED lighting, water features, and therapeutic jets. Work with an experienced builder to customize the landscape surrounding your spa, adding decking, privacy screens, and seating areas. This option is often more affordable than combined pool and spa projects while still providing year-round hydrotherapy and creating an inviting space to unwind and connect with family.