The Grand Spa by Thursday Pools is Thursday Pools’ largest inground fiberglass spa design, and the difference in scale between it and their smaller spa options is immediately apparent at 11’6″ x 11’10”. This is not a compact hydrotherapy add-on. It is a genuine centerpiece that Thursday Pools describes as “resort-like,” the kind of space that changes how you and your family relate to the backyard once it is there. It comes in two configurations, one with a spillover water feature and one without, and it is available as a complement to any Thursday Pools primary pool or as a standalone installation for households that want the full spa experience without a primary pool. Thursday Pools puts it simply: some days enough is enough. The Grand Spa is the place to release tension, ease aches and pains, and genuinely decompress, in your own backyard, without a reservation.
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De-stress and Improve Your Wellbeing
What Is the Grand Spa?
The Grand Spa is Thursday Pools’ largest fiberglass inground spa design. It is available in two configurations:
Grand Spa: O.D. 11’6″ x 11’10” 3′
Grand Spa with Spillover: O.D. 11’6″ x 11’10” 3′
Both configurations share the same outside dimensions and 3′ depth. The spillover version includes a water flow feature that can be directed from the Grand Spa into an adjacent pool or over a deck edge, creating a cascade water feature as part of the overall pool area design. The Grand Spa features stair entry and bench seating inside the structure, giving bathers a comfortable, supported soaking position throughout the interior. Thursday Pools describes the Grand Spa experience as a choice between rejuvenation, family time, and quiet conversation, positioning it as a space that adapts to whatever the moment calls for.
What the Grand Spa Is Not
The Grand Spa is not a swimming pool. Its 3′ depth and square-ish footprint are designed for seated or semi-reclined soaking and hydrotherapy, not lap swimming or active water play. If your household needs a full swim space in addition to a spa, the Grand Spa is the complement to a primary pool rather than a replacement for one.
It is also not the Square Spa or Round Spa. Those two are Thursday Pools’ compact spa options, each measuring 9′ or smaller in their respective footprints, and they serve households that want hydrotherapy capacity in a smaller form. The Grand Spa is for homeowners who want something that makes a statement, that commands visual presence in the pool area, and that provides the interior volume to truly spread out and relax in a resort-level space. If the compact spa options feel like a compromise, the Grand Spa is the answer.
Why Thursday Pools?
Thursday Pools is the only fiberglass spa and pool manufacturer in the United States to hold ISO 9001 certification for quality management and ISO 14001 certification for environmental stewardship, both independently audited standards governing every product made at their Fortville, Indiana facility. The Grand Spa, as the flagship spa design in the Thursday Pools lineup, reflects that manufacturing quality throughout every inch of its shell.
The non-skid gel coat finish on the Grand Spa is the same algae-resistant, foot-friendly surface used across all Thursday Pools designs. In a heated spa where warm water and high bather load create conditions favorable to algae, a gel coat that is genuinely impervious to algae growth reduces both the chemical demand and the cleaning effort associated with maintaining the spa. Thursday Pools builds this into the shell as a standard feature, not an optional upgrade.
Both the Grand Spa and Grand Spa with Spillover are available with the auto-cover ready design, which is particularly relevant for Ohio owners who want to protect a premium spa investment through the extended offseason from fall through spring.
Why Fiberglass, and Why the Grand Spa?
A resort-scale inground spa built in concrete requires masonry work, tile installation, and eventual resurfacing as the concrete ages. The Grand Spa arrives as a precision-molded one-piece fiberglass shell that installs faster, resists algae without resurfacing, and carries a lifetime structural warranty that concrete cannot match. The gel coat finish requires no tile maintenance, no grout, and no resealing over the life of the spa.
For Ohio homeowners, the Grand Spa also represents an investment that extends the outdoor season meaningfully. A spa at therapeutic temperature is usable through Ohio’s fall and well into the colder months when the primary pool is closed. The Grand Spa’s larger water volume compared to the Square or Round Spa also means it holds temperature more consistently once heated, particularly during cold-weather use when ambient air temperatures work against the heating system.
The spillover option further multiplies the Grand Spa’s value as a backyard feature. When paired with a primary Thursday Pools pool, the spillover creates a resort-standard water cascade visible from the pool area, adding both sound and movement to the overall outdoor environment without a separate water feature installation.
Ready to Escape the Commonplace?
You deserve a staycation every day. The Grand Spa by Thursday Pools is how you build one. At Ohio Paradise Pools, we have spent over 32 years installing pools and companion features for Northeast Ohio families and we bring that experience to every Grand Spa project. We are family-owned, full-service, and we cover every stage from site planning through installation and our two-visit pool school so you begin ownership fully confident.
Call us today at (440) 610-5484 or schedule a free consultation to start planning your Grand Spa in Edison Park and the surrounding Ohio communities.
Available Sizes
Rejuvenate, Enjoy Family Time or a Quiet Conversation. You Choose.
Rejuvenate, Enjoy Family Time or a Quiet Conversation. You Choose.
Grand Spa FAQs
How much bigger is the Grand Spa compared to the Square Spa and Round Spa?
The Grand Spa measures 11’6″ x 11’10”, which is meaningfully larger than both the Square Spa (9′ x 9′) and the Round Spa (8’6″ x 8’6″). The Grand Spa’s interior provides noticeably more bench space per person, more room to stretch legs out across the spa floor, and a broader visual presence on the pool deck. If you have sat in the Square Spa at a dealer’s showroom and felt that it was sufficient but not quite as spacious as you wanted, the Grand Spa addresses that. If you have used a spa at a resort or hotel and found that scale more satisfying than a compact residential spa, the Grand Spa comes closer to replicating that experience in your own backyard.
What health benefits does the Grand Spa support?
Thursday Pools describes the Grand Spa as a place to ease aches and pains and release tension after physical activity. These reflect the documented benefits of warm-water hydrotherapy, which increases blood circulation, relaxes contracted muscle tissue, reduces joint tension, and produces physiological changes that support better sleep. The Grand Spa’s larger interior allows users to sit with more room to position themselves against jets and to change positions during a soak in ways a more compact spa does not permit. For adults who use their spa as part of a consistent recovery or relaxation routine, the Grand Spa’s interior space makes that routine more comfortable and effective over time.
Does the Grand Spa with Spillover add significant visual value to a pool area?
Yes. Thursday Pools designs the Grand Spa with Spillover to direct water from the spa surface into an adjacent pool or over a deck edge, creating a cascade effect that adds both visual movement and the sound of flowing water to the entire pool area. When the Grand Spa is elevated slightly above the primary pool level and the spillover is directed into the pool, the effect is comparable to a resort waterfall feature. For homeowners whose primary pool design does not include a built-in water feature, the Grand Spa with Spillover provides that aesthetic as a natural part of the spa installation. Ohio Paradise Pools will help you plan the spillover direction and height relative to your primary pool during the design phase.
Can the Grand Spa be installed as a standalone feature without a primary pool?
Yes. The Grand Spa is an independent fiberglass structure with its own shell, plumbing, and heating system. Thursday Pools designs it primarily as a complement to their pool lineup, but it operates as a fully standalone spa when installed without a primary pool. For households that want the full resort-spa experience at home without the footprint, cost, or commitment of a primary swimming pool, the Grand Spa is a complete and genuinely premium installation. Ohio Paradise Pools has experience installing spa-only projects and scopes these the same way we scope full pool projects: with a site visit, a careful design phase, and full-service installation.
How does the Grand Spa hold temperature compared to smaller Thursday Pools spas?
The Grand Spa’s larger water volume means it takes longer to heat initially compared to the 800-gallon Round Spa or 900-gallon Square Spa. However, once the Grand Spa reaches therapeutic temperature, its larger thermal mass holds that temperature more consistently in cold ambient conditions, which is a meaningful advantage for Ohio owners who use their spa through fall and winter. The balance point in Ohio tends to favor the larger volume for consistent cold-weather use, while the smaller spas heat up faster for warm-weather use where ambient temperatures support the water temperature between sessions. Ohio Paradise Pools will discuss heating system options during the design phase to ensure your Grand Spa performs efficiently in Ohio’s climate year-round.
Is auto-cover readiness available for the Grand Spa?
Yes. The Grand Spa supports an automatic cover installation. For Ohio owners, covering the Grand Spa when not in use is particularly important during the extended offseason from September through May. A covered spa retains heat between uses, prevents debris accumulation, and avoids the chemical drift that occurs when warm spa water is left exposed to outdoor conditions over time. The Grand Spa’s footprint also means a properly fitted auto cover makes a significant aesthetic contribution to the pool deck’s finished appearance when the spa is not in use. Ohio Paradise Pools incorporates auto-cover planning into your project scope when it is part of the plan.
How does the Grand Spa work alongside a Thursday Pools primary pool?
The Grand Spa is listed as an optional addition on most Thursday Pools primary pool models, including the Goliath, Monolith, Spirit, Sea Turtle, Sun Day, and Pearl. When installed alongside a primary pool, the Grand Spa typically sits adjacent to the pool’s perimeter and is planned into the overall outdoor layout so that the two structures feel intentional together rather than coincidental. The Grand Spa with Spillover adds a water flow connection between the two structures when both are operating, creating a cohesive and visually active pool area. Ohio Paradise Pools plans all multi-structure projects as a single design from the beginning to ensure the result is cohesive, not patchwork.
How long does installation take?
The Grand Spa is a one-piece fiberglass shell. When installed as part of a primary pool project, the spa installation typically runs concurrent with the primary pool work and adds minimal time to the overall project timeline. When installed as a standalone structure, most Grand Spa installations are complete within approximately 2 to 3 weeks depending on site conditions, permitting, and the scope of surrounding deck and patio work. Ohio Paradise Pools manages the complete installation scope, provides regular project updates, offers FaceTime walk-throughs during the build, and closes every project with our two-visit pool school.
What warranty does the Grand Spa carry?
Thursday Pools backs the Grand Spa with a lifetime structural warranty on the fiberglass shell and a 15-year surface warranty on the gel coat finish, the same terms that cover all of their pool and spa designs. Ohio Paradise Pools adds over 32 years of Northeast Ohio installation experience, an A+ BBB rating, and three consecutive Cleveland swimming pool contractor of the year awards (2022, 2023, 2024) to that manufacturer coverage. The combination of a strong manufacturer warranty and a local team that built and knows your specific spa is what long-term ownership security looks like.