Custom Spa Builder in Jacksonville, FL

Q: What is the difference between a custom in-ground spa and a portable hot tub?

A custom in-ground spa is a permanent structure built with the same quality as an inground pool. It uses better materials, lasts longer, and adds real property value. Portable hot tubs are temporary and don't add home value.

Q: Can a spa be added to an existing pool?

In most cases yes. We can design and build a spa that integrates with your existing pool. Feasibility depends on current plumbing and available space.

Q: Can an in-ground spa be heated year-round in Jacksonville?

Yes. Jacksonville's climate makes in-ground spas usable year-round. We install efficient gas or electric heaters and can add smart automation so you can set the temperature remotely before you even step outside.

Q: Do you build custom spas in Ponte Vedra and St. Johns County?

Yes. We build custom in-ground spas throughout St. Johns County including Ponte Vedra Beach, Nocatee, St. Augustine, Fleming Island, and surrounding communities.

From standalone luxury spas to pool-integrated hot tubs, Castle Pools, LLC designs and builds custom spas to your specifications throughout Northeast Florida.

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Custom Spa Construction

More Than a Hot Tub — A Custom Spa Built for You

There’s a big difference between a prefab hot tub and a custom in-ground spa built by a licensed pool contractor. Castle Pools designs and builds custom spas that integrate seamlessly with your outdoor space — whether standalone or connected to a pool.

We’ve been building custom spas across Jacksonville, Ponte Vedra, St. Johns County, and Northeast Florida since 2007. Every spa is designed to your exact specifications: size, seat configuration, jet placement, lighting, and finishes — all custom.

Integrated Pool Spas

A spa that flows directly into your pool with a spillover feature. Heated separately so you can use both simultaneously.

Standalone Custom Spas

A permanent, high-end alternative to portable hot tubs — with better aesthetics, better materials, and no maintenance headaches.

Swim Spa Combinations

Resistance swimming, exercise, and relaxation in a single footprint. Designed and built to order.

Spa Features & Options

What Goes Into a Custom Castle Pools Spa

Every spa we build is configurable. Here are the features our clients most commonly choose:

Custom seat and bench configurations

High-pressure hydrotherapy jets

LED color lighting systems

Spillover water features

Smart heating and automation

Custom tile and plaster finishes

Raised spa with spillover to pool

Coping and decking integration

Our Process

How Custom Spa Construction Works

1. Free Consultation

We visit your property, walk the space, and listen to how you want to use the spa. Whether you want it integrated with an existing pool or as a standalone feature, we start with your vision.

2. Design & Quote

We design your spa around your space and your specifications. You’ll receive a detailed quote with no surprises — every feature and material cost is itemized before any work starts.

3. Permits & Build

We handle all permits and inspections for Duval, St. Johns, Clay, and surrounding counties. Our crews manage excavation, plumbing, electrical, and finish work from start to finish.

Where We Build

Custom Spa Construction Throughout Northeast Florida

We build custom in-ground spas across Jacksonville and the surrounding region. All county permits handled in-house.

Mandarin

Ponte Vedra Beach

Nocatee

St. Augustine

Fleming Island

Orange Park

San Marco

Southside Jacksonville

Riverside / Avondale

Fernandina Beach

Yulee

Green Cove Springs

Common Questions

Custom Spa FAQs

What’s the difference between a custom in-ground spa and a portable hot tub?

A custom in-ground spa is built into your property as a permanent structure. It uses better materials, looks dramatically better, lasts much longer, and adds real value to your home. Portable hot tubs are temporary and don’t add property value.

Can a spa be added to an existing pool?

In most cases, yes. We can design and build a spa that integrates with your existing pool. Feasibility depends on your current pool’s plumbing and available yard space. We’ll assess this during your free consultation.

How much does a custom in-ground spa cost in Jacksonville?

A standalone custom in-ground spa typically starts around $20,000–$35,000 depending on size and features. A spa integrated into a new pool build is generally more cost-effective than adding one later. We offer financing through Lyon Financial.

Do you handle permits for spa construction?

Yes. We manage all permits for spa construction in Duval, St. Johns, Clay, and surrounding counties.

How long does it take to build a custom in-ground spa?

A standalone spa build typically takes 4–8 weeks depending on design complexity and permit processing. A spa added during a new pool build is coordinated within the pool construction timeline.

Can an in-ground spa be used year-round in Jacksonville?

Yes. Jacksonville’s mild climate makes in-ground spas usable year-round. We install efficient gas or electric heaters and can add smart automation so you can set the temperature remotely.

Is an in-ground spa harder to maintain than a portable hot tub?

In-ground spas are actually easier to maintain long-term. They use the same filtration and chemistry as your pool, share equipment if integrated, and don’t have the portable components that wear out on packaged hot tubs.

Do you build custom spas in Ponte Vedra and St. Johns County?

Yes. We build throughout St. Johns County including Ponte Vedra Beach, Nocatee, St. Augustine, Fleming Island, and surrounding communities. We handle all county-specific permitting.

Ready to Design Your Custom Spa?

Schedule a free in-home consultation. We’ll walk your property, discuss your options, and put together a design and quote — no obligation.

Schedule a Free Consultation