Concrete pool installation, and what the freedom costs

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.

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 →

How concrete pool installation actually works

1. 1

   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 forA 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.

2. 2

   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 forOver-excavation "to be tidied up later". Extra concrete thickness costs money and the shape you approved on paper should be recognisable in the ground.

3. 3

   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 forThis 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.

4. 4

   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 forPressure 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.

5. 5

   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 forRebound - 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.

6. 6

   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 forA 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.

7. 7

   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 forFinish applied before the deck. It happens on rushed schedules and the finish takes the abuse of every subsequent trade.

8. 8

   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 forNo 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.

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 →

If the number is the problem, here are the ways people pay for it →

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