Pool Backfill Material Cost
Pool backfill typically uses clean 3/4" crushed stone rather than the soil that was excavated, since it drains freely and won't create pressure or settling issues against the pool wall as ground conditions change with the seasons. Pricing typically runs similar to standard clear stone delivery, with total volume depending on pool size and the depth of the backfill zone around the shell.
This is the material side of the project — the excavation and pool installation labor is a separate cost, priced by the operator doing the physical work.
Get a direct quote from Natural Stone Source Ontario for pool backfill stone. Need the excavation done too? See Pool Excavation and Backfill Cost on Pro Operator Network.
Choosing the Right Pool Backfill
Pool backfill has to drain freely and stay stable, because anything that settles around a pool shell shows up as sunken coping, cracked decking and unlevel surrounds. Clean granular material placed in compacted lifts is the standard approach, and native clay is generally avoided against the shell.
Groundwater is the other consideration. Where the water table is high, free-draining backfill combined with proper hydrostatic relief protects the shell against uplift when the pool is emptied. Coordinate backfill timing with the pool installer, since many shells must be filled with water as backfill goes in to balance the pressure on both sides.
Frequently Asked Questions
What material is used to backfill around a pool?
Clean, free-draining granular material placed in compacted lifts. It drains rather than holding water against the shell, and it stays stable so the deck and coping around the pool do not settle later.
Can clay be used to backfill around a pool?
It is generally avoided against the shell. Clay holds water, expands and contracts with moisture and frost, and applies uneven pressure. That combination is a common cause of shifted coping and cracked surrounds.
Why does the pool need to be filled while backfilling?
To balance pressure. Backfill pushes inward on the shell and water inside pushes back out. Many installers require the water level to rise with the backfill for exactly this reason. Follow the pool manufacturer sequence.
How much backfill will a pool excavation need?
It depends on how far the excavation was over-dug beyond the shell, which varies with access and soil conditions. Estimate the space around the shell in cubic yards and convert to tons, and expect the figure to grow if the hole had to be opened up for equipment access.