How much it costs to replace an entire sprinkler system is similar to new installation cost, averaging $3,500 to $8,000 for typical residential quarter acre lot, with range $2,500 to $15,000 depending on size, complexity, and region, as replacement involves removing old system, digging new trenches, installing new pipes, heads, valves, controller, and backflow preventer. Cost includes demolition and removal of old system $500 to $1,500, plus new installation labor and materials. For small yard under 2,000 square feet, replacement may cost $1,500 to $3,500, medium yard 5,000 to 10,000 square feet $3,500 to $7,000, large yard over half acre $7,000 to $15,000. Factors increasing cost include larger number of zones, need for trenching through hard soil or concrete, upgrading to smart controller, and adding drip zones. If pipes are still good, you may only need to replace heads and controller for $1,000 to $3,000, saving money. Permits and backflow preventer add $150 to $400. So full replacement costs similar to new system, often slightly more due to removal.
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