Attached spillover and separate spas drawn into the pool design from the first sketch, not bolted on at the end. A spa adds $14,000–$32,000 at local rates.
Home Pool & Spa
Scope
Process
The calculator prices attached and separate spas as their own lines, so the spa decision is a number, not a vibe.
The spa is drawn with the pool: placement, spillover, seating depth, and the winter heating plan settled in the 3D design.
One permit package for pool and spa together, with the §115922 safety plan covering both.
Shell, plumbing, and equipment sequenced so the spa is not a second project hiding inside the first.
Market ranges
| Tier | What it describes | Planning range |
|---|---|---|
| Standard gunite, no spa | Custom gunite pool, standard equipment set, flat lot | $90,000–$125,000 |
| Custom with attached spa | Standard build plus attached spillover spa, upgraded finish | $125,000–$165,000 |
| Pool with separate spa | Standard build plus an independent spa body and equipment | $145,000–$185,000 |
| Spool | The compact route: pool and spa in one small body of water | $60,000–$90,000 |
Planning ranges for the Conejo Valley market, updated October 2026. The separate-spa tier is the standard build plus the published separate-spa add of $20,000–$32,000; the attached tiers are the cost guide's own table.
Cost drivers
Shared equipment is the attached spa's whole discount. A separate spa duplicates the heater, controls, and plumbing runs, which is where its extra $6,000–$10,000 over an attached spa lives.
A spa at the pool's edge shares excavation and forms. A spa across the yard pays for its own trench, plumbing run, and electrical. Distance is a line item, named in the estimate.
Pool and spa questions
Attached is the Conejo default: one shell pour, shared equipment, and the spillover look most buyers picture, at $14,000–$22,000 added. Separate costs more, $20,000–$32,000, and buys independence: the spa heats and runs on its own schedule while the pool stays closed or cold. Choose on how you will actually use it in January, not on the rendering.
An attached spillover spa typically adds $14,000–$22,000. A separate spa typically adds $20,000–$32,000. Both figures cover the shell, plumbing, equipment share, and finish at local rates, and both are printed on the cost guide add-on table.
Yes, with the plumbing and valving designed for it. An attached spa on shared equipment heats on demand and returns to pool mode. A separate spa is its own system entirely. Either way, the heating design gets decided at the design consultation, because retrofitting the valving later is the expensive version of the same idea.
The spa rides on the same permit as the pool, and the state safety rule names spas directly: Health and Safety Code §115922 covers a new or remodeled pool or spa, so the two-feature requirement and the enclosure spec at §115923 plan around both bodies of water.
Qualify your project
The spa interest field on this form is the one that matters most here. Attached, separate, or not sure yet are all fine answers.
Tell us about your yard and what you want in it. One local builder partner gets your details, not a list of pros.
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