Pools · Service

Concrete pool installation, and what the freedom costs

Gunite and shotcrete build any shape, any depth, any edge. That flexibility comes with the longest schedule, the most stages to get right and a resurfacing cycle you own for life.

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In short

What is concrete pool installation?

A concrete pool is formed in place: steel reinforcement is tied into the excavated hole, then concrete is pneumatically applied over it — sprayed dry-mix as gunite, or wet-mix as shotcrete — and cured into a monolithic shell. Because nothing is pre-made, the pool can be any shape, any depth, and can carry a vanishing edge, a raised spa, a beach entry or a diving well. The price of that is the longest build of the three constructions, more stages that must each be done right, and an interior finish that is periodically replaced for as long as you own the pool.

Triggers

Signs you need concrete pool installation

Your design needs a shape or a footprint that no moulded shell offers — an awkward yard line, a courtyard fit, a specific lap length
You want a depth or a diving configuration that is outside what fiberglass moulds are made in
You want a vanishing edge, a perimeter overflow, a raised integrated spa or a beach entry as part of the structure rather than bolted on
You have no crane access or trailer route for a one-piece shell, but you do have room for a gunite crew and a hose run
You are planning a long tenure in the house, and a resurfacing cycle every so often is an acceptable ownership commitment
You want the interior finish itself to be a design decision — plaster, quartz, pebble and tile all sit on a concrete shell

Seeing something not on this list? Browse pools problems by symptom →

The job

How concrete pool installation actually works

Design, engineering and permit

Because the structure is engineered rather than bought, the plan set matters — soil conditions, slopes, retaining, and any structural feature such as a raised wall or a vanishing-edge catch basin have to be designed before anything is dug.

Watch for: A sketch instead of an engineered plan on a sloping or retained site. Concrete pools on hillsides carry real structural load, and that is engineer territory, not salesperson territory.
Excavation and rough shaping

The hole is dug to the designed profile, including benches, steps, ledges and the transition into any deep end. Concrete follows the shape of the hole, so the dig is the shape of your pool.

Watch for: Over-excavation "to be tidied up later". Extra concrete thickness costs money and the shape you approved on paper should be recognisable in the ground.
Steel — the part you can inspect and never see again

A cage of reinforcing bar is tied throughout the shell, with spacing and lap lengths from the engineered plan, held clear of the soil so concrete can flow all round it.

Watch for: This is your one and only chance to look at the reinforcement. Go and stand in the hole while the steel is exposed and photograph it. Once the concrete is on, the most important structural element of your pool is permanently invisible.
Rough plumbing and electrical bonding

Plumbing lines for skimmers, returns, main drains, spa jets and features are run and pressure-tested before shooting, and the reinforcement steel is bonded to the pool's electrical bonding grid.

Watch for: Pressure tests done casually or not documented. A leak in a line under a gunite shell is one of the worst outcomes in pool ownership — insist the test is witnessed and recorded.
Shooting the gunite or shotcrete

The concrete is applied at pressure over the steel and cut and screeded to the finished profile by a nozzle crew. This is a single continuous operation and it is skilled work.

Watch for: Rebound — the material that bounces off — being trowelled back into the shell instead of removed. It is weaker than properly placed material and it is a known shortcut. Watch how the crew handles the spoil at the bottom of the shell.
Curing

The fresh shell is kept damp for a period so the concrete gains strength properly rather than drying out. In hot or windy weather this needs active attention, not neglect.

Watch for: A crew that shoots on Friday and returns on Monday with nothing in between. Cure quality is invisible, permanent, and directly related to how long the shell lasts.
Tile, coping, deck — then the interior finish last

Waterline tile and coping are set, the deck poured, and only then is the interior finish applied — plaster, quartz aggregate or pebble — because it is the surface everything else would damage.

Watch for: Finish applied before the deck. It happens on rushed schedules and the finish takes the abuse of every subsequent trade.
Fill and the plaster start-up routine

The pool is filled without stopping, and a specific start-up routine follows — brushing, chemistry and timing that vary by finish type. New plaster is chemically active in its first weeks and reacts to how it is treated.

Watch for: No written start-up schedule handed to you. Staining, scaling and mottling from a badly managed first month are extremely common, look like defects, and are almost never covered by anyone.

Money

What does concrete pool installation cost?

Custom concrete is normally the most expensive of the three constructions to build and the only one with a scheduled resurfacing bill for as long as you own it. Shape complexity, depth, structural features and finish choice drive the number more than pool size does.

See the full concrete pool installation cost guide — by material, size and region →

Pool planning calculators → Volume, budget and operating-cost estimators.

Straight answer

When concrete pool installation is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

You want to be swimming this season. Gunite is a sequence of stages, several of them weather-dependent and each with an inspection. If a summer deadline is the point, fiberglass is the format that meets it and a concrete builder will still tell you they can try.
You have not budgeted for resurfacing at all. A plastered concrete pool gets refinished periodically for its entire life. That is not a defect, it is how the format works — but if it is not in your ownership plan then the pool is more expensive than you think it is.
Your household will not stay on top of water chemistry. Plaster is a reactive surface. Aggressive or badly balanced water etches and stains it, and unlike a liner or a gelcoat shell, the damage accumulates permanently until the next resurfacing.
Nobody local shoots gunite regularly. Nozzle work is a specialist trade with a real skill gradient, and the results are sealed inside your pool forever. In markets where concrete pools are uncommon, this is a genuine reason to pick a different format.
You are on a tight lot with neighbours very close. A gunite job means a long noisy shoot, hose runs, a pump truck, multiple deliveries and a long occupation of the street. It is worth being honest with yourself about whether you want that for months.
You want a fixed price and no surprises. Of the three formats, concrete has the most site-condition variables — rock, groundwater, retaining, engineering. Ask specifically what happens if rock is hit, because that answer is the difference between a firm price and a starting price.

Your options

Types of concrete pool installation

Gunite, shotcrete and finish materials

Plaster, quartz and pebble as materials, with their own trade-offs.

Fiberglass vs concrete

The head-to-head, deliberately not restated here.

Fiberglass pool installation

The fastest build, if a mould fits your yard.

Pool resurfacing

The recurring job that comes with owning a concrete pool.

Compare pools options side by side →

Before you sign

What to check when hiring for concrete pool installation

Who engineered this shell, and can I see the plan set with the steel schedule?

On any sloped, retained or unusual site the engineering is the pool. A builder who cannot produce a plan set is building from habit.
Can I inspect and photograph the steel before you shoot?

A builder confident in their reinforcement will welcome it. Hesitation here tells you more than any reference.
What is your curing procedure, and who is on site during it?

Cure quality permanently sets the strength of the shell and it is completely invisible afterwards. You want a named procedure, not a shrug.
Are the plumbing pressure tests documented and witnessed?

A buried leak under a monolithic shell is the most expensive failure in this build. Documentation is your only leverage later.
What happens to the price if you hit rock or groundwater?

The two most common cost escalations on a concrete build. Get the mechanism — rate, cap, or renegotiation — before signing.
Which interior finish are you quoting, and what is its expected service life here?

Plaster, quartz and pebble differ substantially in life and price. A quote that just says "interior finish" is not comparable to another quote.
Will you give me a written plaster start-up schedule at handover?

The first weeks decide how your finish looks for years, and this is the single most commonly skipped handover document in the trade.

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Local pros

Concrete Pool Installation near you

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Related work

Often done at the same time

Inground Pool Installation

The decision above this one

Fiberglass Pool Installation

The fast alternative

Pool Resurfacing

The recurring finish replacement

Pool Remodeling

Reworking an existing concrete pool

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FAQ

Concrete Pool Installation — questions people ask

Still have a question? Talk to our team →

What is the difference between gunite and shotcrete?

Both are concrete applied pneumatically over reinforcing steel, and both produce a monolithic pool shell. The difference is where the water is added. Gunite arrives dry and is mixed with water at the nozzle, which gives the operator control and makes the nozzle work skill-dependent. Shotcrete arrives pre-mixed wet from a truck, so the mix is batched under controlled conditions but has to be placed within a working window. Well-executed, both make an excellent pool; the crew matters more than which one your builder uses.

How often does a concrete pool need resurfacing?

It is on a cycle rather than a fixed date, and the honest answer is that it depends heavily on the finish chosen and on how well the water has been balanced over the years. Plaster is the shortest-lived and the cheapest to replace; quartz and pebble finishes typically last longer and cost more. The important thing is not the exact interval but that you plan for it as a recurring ownership cost. See Pool Resurfacing.

Why do concrete pools crack?

Surface crazing in plaster is common and usually cosmetic. Structural cracks in the shell itself are a different matter and generally trace to one of a few causes: reinforcement placed wrongly or too little of it, poor curing, ground movement or expansive soil that was not engineered for, or hydrostatic pressure when the pool was drained. That list is why the steel stage and the engineering are worth your attention while they are still visible.

Can a concrete pool be built on a slope?

Yes, and this is one of gunite's genuine advantages — hillside pools, raised walls and vanishing edges are all concrete territory. But a pool on a slope is a retaining structure holding back soil as well as a vessel holding water, and it needs to be engineered as one. Insist on a stamped design, and be wary of any builder who treats a sloped site as a normal job with a bit of extra fill.

How long does a gunite pool take to build?

It is the longest of the three constructions by a wide margin, because the stages are sequential and several depend on weather and on inspections between them: excavation, steel, plumbing, shoot, cure, tile and coping, deck, then interior finish. Any one of those slipping pushes everything behind it. Ask your builder for a stage-by-stage schedule rather than a single end date, and ask what their current backlog is between stages.

Should I choose plaster, quartz or pebble?

It is a trade between price now and life later, and also a look decision — the finish sets the colour of the water. Plain white plaster is the least expensive and the shortest-lived. Quartz-aggregate finishes are more durable. Pebble finishes are the most durable and the most expensive, with a noticeably different texture underfoot that some people love and some do not. Feel samples in person before choosing, and see Pools Materials.