One Build, Two Ways to Unwind: The Pool for Summer Days, the Spa for Every Night
Ask pool owners what they use most, and a surprising number will point past the pool to the smaller circle of churning water beside it. An attached spa — built into the pool's edge so water spills from the spa into the pool in a shimmering sheet — is the hardest-working feature in backyard design. Kids treat it as the warm shallow spot. Adults treat it as a nightly ritual: twenty minutes of hot water and jets after the day is done. And because it shares the pool's equipment, an attached spa costs far less to add during construction than a standalone hot tub costs on its own.
How an Attached Spa Works
An attached spa is a raised concrete vessel — usually 6 to 8 feet across and about 3 feet deep — built as part of the pool structure and finished in the same plaster or tile. It sits 12 to 18 inches above the pool's waterline, and water flows over a spillover edge back into the pool, which keeps the spa's water circulating and filtered through the pool's system.
Shared equipment, smart plumbing
The spa runs on the pool's pump, filter, and heater, with a set of valves that switch the system between "pool mode" and "spa mode." In spa mode, water is pulled from the spa, heated rapidly, and pushed back through the jets. A dedicated spa heater or a high-output pool heater brings the spa from pool temperature to 102–104°F in 20 to 30 minutes. Because the equipment is shared, you avoid buying a second pump, second filter, and second heater — which is why building the spa with the pool costs a fraction of adding a standalone unit later.
The spillover
The spillover is both plumbing and theater. Water cresting the spa's edge into the pool creates a waterfall effect you can hear from the patio — many homeowners say it is their favorite sound in the yard. The spillover can be a full-width sheet, a narrow slot, or a series of scuppers, and it runs whenever the pool circulates, which keeps the spa water fresh even when nobody is soaking.
Therapy Jets: More Than Bubbles
Spa jets are not all alike. A well-designed spa mixes jet types: directional jets that target the lower back, rotary jets that knead shoulders, and foot jets in the floor for tired feet. Jet placement follows the seating — each seat gets its own cluster aimed at a different muscle group. If anyone in your household deals with back pain, arthritis, or post-workout soreness, tell your designer during the design phase so the jet layout is planned around real bodies, not a template.
Year-Round Use in Central Florida
Here is the math that sells most Orlando homeowners on a spa: the pool is comfortable roughly March through November, but the spa is comfortable 365 days a year. On a 55-degree January evening — and yes, Orlando gets those — a 103-degree spa under the stars is pure luxury. The spa effectively doubles your backyard's usable season, and because it is a small body of water, heating it for an evening costs a fraction of heating the whole pool.
Design Options
- Classic raised round spa — the timeless look, usually finished in matching plaster with a tile spillover edge.
- Rectangular perimeter spa — a modern linear spa along one edge of a geometric pool, often with a full-width slot spillover.
- Vanishing-edge spa — the spa's outer edge disappears like an infinity edge pool, for dramatic views on sloped lots.
- Flush in-pool spa — set at pool level inside the pool's footprint, ideal when a raised structure would block a view.
Safety and Practical Notes
Spas run hot — 104°F is the maximum recommended water temperature — so young children should only use the spa with adult supervision and for short soaks. Most builders include a spa-side control panel and recommend a locking safety cover when the spa is not in use, which also cuts heat loss and chemical use. Like the pool itself, the spa falls under Florida's pool safety barrier requirements.
What a Combo Adds to Project Cost
Adding an attached spa during new construction is one of the best values in pool building — broadly, it adds a five-figure sum to the project rather than the much higher cost of a standalone spa installed separately later. The exact amount depends on size, jet count, and finish choices. The written quote from your design visit is the real number.
Heating a Combo: What to Know
One question comes up on every spa combo project: can I heat just the spa without heating the whole pool? Yes — that is exactly what the valve system is for. In spa mode, the heater sends hot water only to the spa while the pool sits at ambient temperature. This is the economical way to soak on a cool evening without paying to heat 15,000 gallons. If you do want the pool heated too — extending swim season into winter — a heat pump sized for the pool handles that separately. Many Orlando homeowners heat only the spa most of the year and run the pool heater for holiday gatherings. Your equipment plan gets sized around whichever pattern fits your household.
Design Your Pool and Spa Together
A spa designed with the pool from day one looks inevitable — same materials, same sightlines, plumbing planned in the steel stage instead of retrofitted. See how it comes together in our custom pool design process, then fill out the form on our contact page for your free consultation.