Excavation in saturated ground produces spoil that will not go back and a backfill that settles later. Work is commonly paused not for comfort but because the results are worse.
How much rain Phoenix gets in a day
A ten-year storm here drops 2.29 inches in twenty-four hours, and a hundred-year storm drops 3.56. Those two figures are the reason scheduling still matters in this trade: the same excavation is a different job in the week after a storm like that than in a dry one, and a firm that books around the forecast is protecting the result.
The reasoning behind that
Wet ground is the problem, not the rain. Excavated saturated soil loses its structure, comes out as something closer to slurry, and cannot simply be replaced and compacted. That turns a tidy backfill into a spoil-removal job and a settled backfill later. A storm also changes what can be read. Standing water hides the grade around the slab, and the grade is part of what an inspection records and part of what a drainage scope is priced from. Some work is genuinely weather-independent — interior piers under a roof and crack injection inside the house. Ask which category your scope falls into rather than assuming the whole job stops. A firm that offers to proceed regardless in heavy rain is worth a question about why. Sometimes there is a good answer; sometimes it is a schedule being protected at the cost of the result.
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