Most Central Ohio basement and slab homes land between $1,200 and $2,400 for an active sub-slab system. Crawl spaces that need a sealed membrane run $1,800 to $3,500. A professional short-term test is $150 to $300.
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The spread inside those ranges comes from the house, not the ZIP code. A 1990s Dublin or Pickerington slab with a clear path to the attic sits near the bottom. A Clintonville or Bexley basement with a patched floor, a sump, and walls that need extra sealing sits near the top, and a house that needs a second suction point can reach it. Ohio's mitigation standards also require items that belong in every price: a monitor or marked gauge, labels, an exterior fan hard-wired with its own outdoor disconnect, and a sealed sump cover that can still be lifted for pump service. Every Ohio proposal has to show the installation price and an estimate of what the system costs to run each year, so two quotes can be compared line for line. Our pricing guide by foundation type breaks the tiers down, and the calculator gives a starting range.