How to Build a Concrete Pool From Digging to Swimming

The Owner-Builder Reality: Managing Trades Versus Physical Labor

Building an in-ground concrete pool is rarely a solo job with a shovel and a wheelbarrow. A standard pool requires moving dozens of truckloads of dirt, tying thousands of pounds of steel, and spraying tons of wet concrete under high pressure. When homeowners choose to build their own pool, they almost always step into the role of an owner-builder. In this position, you act as the general contractor instead of the manual laborer.

Serving as the general contractor lets you purchase materials directly and hire specialty subcontractors for each phase. This can cut overall project costs by fifteen to twenty-five percent by removing a pool company markup. But this savings comes with real responsibility. You schedule the crews, coordinate material deliveries, pull city permits, and handle building inspectors. If a subcontractor makes an error or skips a step, resolving the issue falls squarely on your shoulders.

Before digging, you must secure engineering plans and municipal permits. Local building codes dictate property setbacks, safety barrier fences, electrical bonding rules, and water drainage. You must obtain structural plans stamped by an engineer. The engineer calculates shell thickness, rebar spacing, and wall depth based on local soil conditions. Loose sand, heavy clay, and shallow water tables each require specific structural adjustments. Digging without permits risks steep fines and orders to fill the excavation back in.

Knowing which tasks to do yourself and which to hire out protects your property. Homeowners can safely paint layout lines, dig small equipment trenches, clear brush, water the curing concrete, and organize site cleanups. In contrast, you should hire licensed crews for structural digging, steel placement, rough plumbing, concrete spraying, electrical hookups, and plastering. These specialty trades carry dedicated machinery and liability insurance that protect your home from catastrophic damage.

Laying Out the Yard, Digging, and Building the Shell Framework

Construction begins by marking the pool perimeter in your yard. Wooden stakes and string lines map out the shallow end, deep end, steps, and benches. You then outline the shape on the grass with spray paint. The excavation crew digs the hole roughly one foot wider and deeper than the finished pool dimensions. This extra space, called overdig, leaves room for structural walls, plumbing pipes, and gravel beds.

Excavators dig out the shape using heavy equipment. The ground beneath the pool floor must stay solid and undisturbed. If an operator digs too deep and backfills with loose dirt, that soil can settle later and crack the heavy concrete bowl. In unstable soil or high water tables, crews place crushed rock along the bottom to build a stable base and promote drainage.

Once the dirt takes shape, rough plumbing lines are installed. Crews lay thick Schedule 40 PVC pipes along the trench floors to connect the bottom main drains, skimmer boxes, and water return jets. Every fitting is bonded with PVC primer and solvent cement. Because these pipes will soon sit under solid concrete, a single loose joint can create a permanent leak. Crews install temporary pressure gauges on all pipe ends and pressurize the lines with air or water to confirm they are sealed.

Next comes the rebar cage. Rebar consists of steel bars tied in a grid for strength. Workers bend and secure the steel bars with tie wire, creating a tight basket that lines the dirt walls and floor. The steel grid must never rest directly on bare dirt. Small concrete spacer blocks, called dobies, lift the metal basket several inches off the ground. If rebar touches soil, underground moisture causes the steel to rust, expand, and crack the concrete shell.

Before spraying concrete, an electrician attaches a continuous bare copper wire to the steel grid, metal light housings, and equipment pads. This process, called electrical bonding, ensures all metallic parts share the same electrical potential. Bonding directs stray ground voltage away from swimmers, preventing electric shock.

Before calling for your city pre-pour inspection, review this structural checklist:

• Keep plumbing lines pressurized with air or water, verifying no pressure drops for at least 24 hours.
• Check that concrete dobies hold the steel rebar at least three inches above the dirt.
• Confirm that rebar intersections are tied securely and overlap by the engineering plan measurements.
• Verify that the continuous copper bonding wire connects to the rebar grid and passes local electrical codes.
• Clear all loose dirt clods, roots, and debris out of the excavation floor before concrete delivery.

Spraying the Shell and Daily Curing: Gunite and Shotcrete

Concrete pool shells are formed by spraying concrete mixture through a hose at high velocity against the earth and rebar cage. This technique builds a dense, seamless concrete basin without joints. Homeowners generally choose between two application methods: gunite or shotcrete.

Gunite uses dry concrete mixed with water at the spray nozzle. Sand and dry cement travel through a hose under air pressure, and the nozzle operator adds water right as it exits. This gives the operator instant control over moisture levels, which helps on steep walls. Shotcrete is wet concrete pumped and sprayed under pressure. It arrives pre-mixed in a concrete truck, ensuring consistent ratios throughout the batch. Both methods produce a durable shell when applied by a skilled crew.

Application day moves quickly. A crew sprays the material from the bottom up while finishers use straight edges, wires, and trowels to carve steps, benches, and smooth walls. Watch out for rebound during this step. Rebound is loose aggregate that bounces off the wall and falls to the floor. Workers must shovel rebound out of the pool and discard it. Shoveling loose rebound back into walls or steps creates weak, crumbly pockets that degrade over time.

After shaping the concrete, the curing phase begins. Curing means watering fresh concrete daily to build strength. Concrete does not harden by drying out. It hardens through hydration, a chemical reaction between cement and water. If water leaves the concrete too quickly, hydration stops and the shell develops structural cracks.

Starting the morning after the shoot, spray down the bare concrete shell with a garden hose two to three times daily for twenty-eight days. Soak the floor, walls, and benches until water pools in the deep end. In hot or windy conditions, spray four to five times daily. This constant moisture allows the concrete to reach its full structural strength.

Finishing Touches: Coping, Tile, Plaster, and Pool Startup

A raw concrete shell is porous and rough to the touch, so it requires protective finishes before holding water. Work begins at the top edge with coping. Coping consists of cap stones lining the top pool edge. These stones create a safe walking perimeter, give swimmers a handhold, and direct splash-out water toward deck drains rather than behind the shell.

Directly beneath the coping, workers install a six-inch band of waterline tile. This glazed tile sits at the water surface, where body oils, sunscreen, and leaves gather. Tile wipes clean easily. Without it, oils and minerals would soak into the porous concrete at the water surface, creating stubborn stains that are difficult to scrub off.

Next, plasterers apply the interior finish. Plaster seals the pool and creates a smooth, watertight layer over the concrete. Crews pump a blend of white cement and crushed marble dust into the basin, troweling it flat by hand. Homeowners can also choose quartz or pebble aggregate surfaces for extra durability and richer water colors.

As soon as the plaster crew packs up, place a garden hose in the deep end and start filling the pool immediately. Wrap the hose nozzle in a clean cloth to prevent scuffing the soft plaster. Keep the water running continuously until it reaches the middle of the waterline tile. Stopping the water midway leaves a permanent ring etched into the fresh plaster.

Once full, switch on the circulation equipment. Knowing how to prime a pool pump without burning out the motor helps you pull water through the suction pipes smoothly and protect your pump seals. Brush the plaster twice daily for two weeks to sweep away loose plaster dust. Monitor water chemistry daily, adding acid as the curing plaster naturally raises pH. Wait thirty days before turning on any heaters so hot water does not soften the curing plaster. After thirty days, learn how to safely start and run a pool heater to bring the water up to swimming temperature.

FAQs

Can an owner build a concrete pool without hiring trade crews?

Attempting to build a concrete pool completely alone is not realistic. Moving dozens of tons of earth, bending heavy steel grids, and spraying tons of concrete require commercial equipment and trained crews. Acting as an owner-builder means managing these trades yourself, not doing all the physical labor alone.

How long does the entire concrete pool construction process take?

Most owner-builder concrete pools take between three and six months from excavation to filling with water. Digging, plumbing, and steel take two to three weeks. Spraying the concrete shell and curing it with daily hose watering takes roughly four weeks. Coping, tile, plaster, and deck work fill the remaining weeks based on subcontractor schedules.

How do you prevent pipe leaks beneath the concrete pool shell?

Preventing leaks requires using thick Schedule 40 PVC, cleaning and priming every joint, and applying heavy-duty cement. Before spraying concrete, seal the pipe ends and pressurize the lines with air or water using a pressure gauge. Keep the lines pressurized throughout the concrete shoot so any sudden pressure loss immediately reveals damage.