How Long Does It Take to Build an Inground Pool?

The honest answer is somewhere between 3 and 6 months for most inground concrete pools in Southern California, measured from the time you sign a contract to the day you can actually swim. Simpler builds with straightforward site conditions and fast permitting land at the lower end. Larger projects with custom features, hillside lots, or complex permit requirements can run longer.

That range is wide enough to be frustrating if you’re trying to plan around a specific date, so this article breaks down what actually happens in each phase, how long each one takes, and what tends to push timelines out.

Why It Takes Longer Than Most Homeowners Expect

The most common source of surprise is permitting. Most homeowners assume construction starts shortly after signing a contract. Still, in Orange County and most of the surrounding region, the permit approval process alone runs 4 to 8 weeks before a shovel touches the ground. Some cities are faster; some are slower. This phase is largely outside the contractor’s control once the application is submitted.

The second thing people underestimate is the curing time required at multiple stages. Gunite,  the structural shell of a concrete pool, needs time to cure properly before the next phase can begin. Rushing it compromises the structural integrity of the shell. Similarly, plaster applied to the interior requires careful management of water chemistry during the first two weeks after filling. These aren’t delays; they’re part of doing the work correctly.

Phase by Phase: The Inground Pool Construction Timeline

Design and Pre-Construction: 1 to 4 Weeks

Before any permits are filed, you and your contractor finalize the design. This includes the pool’s shape, dimensions, depth profile, interior finish, tile and coping selections, equipment specifications, and any add-ons like a spa, water features, or deck work. For a straightforward build, this phase can move quickly, sometimes within a week or two of your initial consultation. Projects with structural complexity (hillside lots, spa additions, custom rockwork) or homeowners still deciding on finishes can take longer.

This is also when the contractor orders a soils report, if required by your jurisdiction, and a geotechnical evaluation of the soil composition and bearing capacity, which some cities require as part of the permit application—plan: 2 weeks for this, if needed.

What helps: Coming to the consultation with a general sense of what you want, approximate size, whether you want a spa, deck material preferences, speeds this phase up considerably. The contractor can help refine the details; having a starting point avoids multiple rounds of revision.

Permitting: 4 to 8 Weeks

Once the design is finalized and drawings are prepared, your contractor submits the permit application to the relevant city or county building department. This is typically the longest wait of the entire project, and it happens before any visible work begins.

In Orange County and surrounding cities, permit approval for a standard inground pool generally takes 4 to 6 weeks. Some cities run faster; others have backlogs that push it to 8 weeks or more. Projects requiring additional engineering review, structural modifications, hillside construction, and larger spas can take longer.

Permits cover the pool shell, plumbing, electrical, and decking. Some cities also require separate approvals for gas lines (for heaters) or for fences and barriers, which may run on parallel tracks.

What helps: Using a contractor with established relationships and experience in your specific city. Knowing how to prepare a complete application the first time and avoiding correction requests that restart the clock matter significantly here.

Excavation: 1 to 3 Days

Once permits are approved, excavation is typically one of the faster phases. A standard residential pool can be dug in one to two days with a trackhoe. The spoils (excavated soil) are hauled off-site, usually on the same day or the following day.

A few things can extend this phase in Southern California:

Limited access. Many homes in Orange County and LA County have narrow side yards or fencing that limits access for heavy equipment. When a full-size excavator can’t get in, the contractor uses smaller equipment or hand excavation in confined areas, adding time and cost.

Rock and caliche. Inland areas (particularly parts of Riverside and San Bernardino counties) frequently encounter caliche, a hardened calcium carbonate layer in the soil, or actual rock. Breaking through requires jackhammering or, in extreme cases, blasting, which adds days and requires additional permitting.

Underground surprises. Old irrigation lines, utility conduits, or tree roots can require rerouting or hand digging in specific areas.

Steel and Plumbing: 1 to 2 Weeks

After excavation, the rebar framework is installed, a grid of steel reinforcing bars that will become embedded in the gunite shell. Plumbing lines (for returns, suction, main drain, and any water features) are also run at this stage, along with electrical and lighting conduit.

A building inspection is typically required at this stage before gunite can be applied. The inspector verifies that the steel and plumbing meet the permitted plans. In most Southern California jurisdictions, this inspection can be scheduled within a few days of the request, though backlogs occasionally extend the timeline.

Spa additions, complex water features, and multiple light installations add time at this phase. A pool with an attached spa and a waterfall feature is meaningfully more plumbing work than a pool with a single return and skimmer.

Gunite Application: 1 to 2 Days, Plus Curing Time

Gunite is a dry-mix concrete sprayed under high pressure onto the steel framework. A typical residential pool shell can be gunited in a single day. The crew works section by section, building up the walls and floor to the specified thickness before hand-shaping and finishing.

After application, the shell needs to cure, and this is important. Gunite curing typically takes 7 to 14 days. During this time, the shell should be kept damp (a process called wet curing) to achieve proper strength. In Southern California’s dry heat, wet curing is particularly important; a shell that dries out too quickly before the hydration process is complete develops micro-fractures that compromise the structure.

Some contractors shorten curing time to keep the project moving. This is one of those phases where cutting time cuts quality. A properly cured shell is the foundation on which everything else is built.

Another building inspection typically occurs after gunite and before the next phase.

Tile, Coping, and Interior Finishing: 2 to 4 Weeks

Once the shell has cured, the finishing phases begin. These include:

Waterline tile: The band of tile at the water’s edge. Standard tile work on a typical pool takes 1 to 3 days. Complex mosaic patterns or larger tile formats take longer.

Coping: The cap stone at the top of the pool wall where the pool meets the deck. For travertine, precast concrete, or natural stone, installation typically runs 1 to 3 days for the pool perimeter.

Deck work: Concrete, pavers, or other decking material around the pool. The scope varies significantly depending on deck size and material. A basic broom-finished concrete deck around a standard pool can be poured in a day or two. A large travertine paver deck with intricate cuts takes longer to install. Plan 3 to 7 days for deck work depending on scope, plus curing time before it can be walked on.

Interior finish (plaster, quartz, or pebble): The application itself is a single-day event for most residential pools, but it follows from everything else being complete. Plaster crews work quickly; the entire interior of a pool is typically applied in 4 to 8 hours by a full crew. The pool must be filled immediately and continuously after application begins.

This phase also includes equipment installation (pump, filter, heater, automation), which typically runs in parallel with deck and coping work.

Fill and Chemical Startup: 1 to 2 Weeks

Filling a typical residential pool takes 12 to 24 hours with a standard hose connection. Some homeowners use a water truck to speed this up, particularly in areas with water restrictions or where minimizing fill time matters.

Once filled, the chemical startup process begins. For plaster and quartz finishes, the first 7 to 14 days involve specific chemical management to cure the surface properly and establish balanced water chemistry. During this period, the pool shouldn’t be used.

Pebble finishes require an additional step, an acid wash after the initial cure to open up the pebble surface and remove cement haze. This typically happens 28 days after fill, meaning pebble-finish pools have a slightly longer wait before the first swim.

After the startup period, a final building inspection is required in most jurisdictions before the pool can be used.

Realistic Timeline Summary

What Most Commonly Extends the Timeline

Mid-project design changes. Changing the pool shape, adding a spa, or switching finish materials after construction has started can require revised permits, additional engineering, or rescheduling specialty crews—changes made before permitting incur the lowest cost. Changes made after gunite can be expensive and time-consuming.

City inspection backlogs. Most Southern California cities schedule inspections within a few business days, but some jurisdictions move more slowly, and busy periods (spring and summer) can create backlogs. Multiple inspections are required throughout the build; each one is a potential hold point if scheduling doesn’t go smoothly.

Equipment and material lead times. Most standard pool equipment ships readily, but specialty items, custom tile orders, specific automation systems, and certain coping materials can have lead times of several weeks. This contractor plans orders to avoid delaying the finishing phases.

Weather. Southern California’s climate is generally favorable for year-round construction, but heat waves can affect gunite curing, and occasional heavy rain delays excavation, gunite, and concrete work. These delays are typically measured in days rather than weeks.

Site complications were discovered during excavation. Rock, caliche, high groundwater, unmarked utilities, and tree roots are the most common. A contractor with experience in your specific area will have a sense of what to expect, but some surprises are unavoidable.

Concrete vs. Fiberglass vs. Vinyl: How Pool Type Affects Timeline

The timeline above applies to concrete (gunite) pools, which are standard for custom inground pools in Southern California. Other pool types have shorter construction timelines but different tradeoffs:

Fiberglass pools arrive as a pre-manufactured shell that’s craned into the excavation and set in place. The installation process can be completed in 2 to 4 weeks once permits are approved. The tradeoff is limited customization; you choose from available shell shapes and sizes rather than designing a pool from scratch.

Vinyl liner pools are less common in Southern California due to climate and soil conditions. A vinyl liner installation can be completed in 2 to 3 weeks. Liners need to be replaced every 8 to 12 years and don’t hold up as well in high-UV environments.

For most Southern California homeowners who want a pool tailored to their specific yard and aesthetic, concrete is the standard, and the longer timeline reflects the additional design flexibility and structural permanence.

Frequently Asked Questions

Can you build a pool in winter in Southern California? Yes, and it’s often advantageous. Permit processing times tend to be faster in the fall and winter, contractor schedules are more flexible, and you’re more likely to be swimming by summer. The mild Southern California climate means winter construction doesn’t require heated enclosures or special cold-weather procedures as in other regions.

What’s the best time of year to start the process? If you want to swim in the summer, start the process in the fall. With permitting taking 4 to 8 weeks and construction running 8 to 16 weeks after that, beginning in October or November, puts you in the water by May or June in a typical scenario.

How do I avoid timeline surprises? The two biggest controllable factors are finalizing your design before permits are filed (mid-project changes are expensive and time-consuming) and choosing a contractor with established permitting experience in your city. Ask specifically how long permitting typically takes in your jurisdiction and what their process is for managing inspection scheduling.

Does a spa addition significantly extend the timeline? Not dramatically for a well-organized contractor. An attached spa adds plumbing and structural work at the steel phase and additional equipment at installation, but it shouldn’t add more than 1 to 2 weeks to the overall timeline if planned from the start. Adding a spa after permits have been filed is a different situation and requires a permit revision.

When does the warranty clock start? This varies by contractor, but most pool warranties begin at project completion, typically defined as the date of the final inspection approval or the date of first fill. Confirm this in your contract before signing.

A Note on Planning Realistically

The homeowners who have the smoothest experiences are almost always the ones who treated the 3- to 6-month timeline as the planning reality rather than the worst case. Building a pool involves coordination between multiple specialized crews, city inspection schedules, equipment deliveries, and weather,  none of which move on demand.

The contractors who promise dramatically shorter timelines are usually the ones skipping curing time, rushing inspections, or failing to account for permitting in their quoted schedules. Understanding what each phase requires helps you ask the right questions when comparing bids.

If you’re in Orange County or the surrounding area and ready to start planning, Alan Smith Pools has been building pools in Southern California since 1981 and offers free on-site consultations. Getting a site walk and a realistic timeline estimate from an experienced local contractor is the best first step.

Schedule a Free Consultation | Call (714) 628-9494