How Much Does It Cost to Add a Jacuzzi or Spa to an Existing Pool?

Adding a Spa to Your Existing Pool

Many pool owners wish they'd included a spa from the beginning. The good news: you can add one later. The less good news: it's more expensive than including it in initial construction. Here's what adding a spa to your existing pool actually costs.

Two Approaches: Attached vs. Standalone

Attached Spa (Connected to Pool)

An attached spa shares water with your pool and is physically connected. Water can spill over from spa to pool, creating a visual and audible connection.

Cost: $15,000-$35,000 depending on size and complexity

Pros: Integrated look, easier operation, spillover features possible

Cons: Higher cost, more construction disruption, can't have different water temperatures

Standalone Spa (Separate from Pool)

A separate spa has its own equipment and water system. It can be placed near the pool or elsewhere in the yard.

Cost: $12,000-$25,000 for custom; $8,000-$15,000 for prefab

Pros: Lower cost, less disruption, separate temperature control, flexible placement

Cons: Separate equipment to maintain, less integrated appearance

What's Included in Spa Addition Costs

• Excavation and soil export
• Spa shell construction (shotcrete)
• Plumbing to existing or new equipment
• Jets and hydrotherapy features
• Interior finish (plaster/pebble)
• Tile and coping
• Heating (often shared with pool)
• Automation integration
• Decking repair/modification

Additional Equipment Considerations

Adding a spa may require equipment upgrades:

• Larger heater: $1,500-$4,000 (spa needs to heat quickly)
• Spa pump: $800-$1,500 (separate pump for jets)
• Automation upgrade: $500-$2,000 (to control spa separately)
• Blower: $500-$1,000 (for bubble effect)

Design Options

• Raised spa with spillover: Most dramatic, costs most ($25,000-$35,000)
• Level spa with spillover dam: Integrated look, mid-range ($18,000-$25,000)
• Simple attached spa: Functional addition ($15,000-$20,000)
• Detached custom spa: Maximum flexibility ($12,000-$20,000)
• Prefab spa: Fastest, lowest cost ($8,000-$15,000 installed)

Timeline

Adding a spa to an existing pool typically takes:

• Permits: 2-6 weeks (depends on jurisdiction)
• Construction: 3-6 weeks
• Total: 5-12 weeks

During construction, your pool may be unusable for 2-4 weeks depending on how the spa connects.

We regretted not including a spa originally. Adding it later cost more, but we use it every night. Worth every penny. — Robert K.