FEMA National Risk Index · U.S. Census Bureau, ACS 5-Year Estimates · public county data, not a national estimate
A cracked slab ranges from harmless to structural, and telling which is the whole game — thin surface cracks are cosmetic, while wide, offset, or lengthening cracks can signal foundation movement.
Handle it soon — these get more expensive with time.
Common causes:
• Normal concrete curing and shrinkage — the source of most thin, stable hairline cracks
• Foundation settlement offsetting the slab, which shows as wider cracks with a lip or height difference
• Soil movement or a plumbing leak washing out support under the slab
• Tree roots or heaving pushing a section of slab up or down
• A pier-and-underpinning sale for what looks like a normal hairline shrinkage crack
• No state license number for structural work, or no engineer for a crack that shows real movement
• A diagnosis that never checks for a plumbing leak washing out the soil below
• Epoxy-filling a moving crack without addressing why it's moving
Which slab cracks are serious?
The warning signs are width and offset: a crack wider than a credit-card edge, one where one side sits higher than the other, or one that's clearly lengthening over time. Cracks with those traits, or that come with sticking doors and sloping floors, deserve a structural look. Thin, stable hairlines usually don't.
Can a cracked slab be a plumbing problem?
Yes — a leaking supply or drain line under the slab can wash out the soil that supports it, causing cracks and settlement. That's why a good evaluation rules out a slab leak before assuming it's pure soil movement; fixing the leak is part of the real repair.
Foundation repair / house leveling (structural): $2,200–$15,000 (typical ~$5,000)
Sealing a hairline crack is modest; piering, underpinning, and leveling for a settling foundation run much higher. Florida soil conditions and access dominate.
Curated Florida 2026 estimate — installed cost for a typical FL single-family home, not a bid.
Florida licenses this trade at the STATE level (DBPR / CILB (CGC/CBC/CRC) — structural foundation, piering, leveling). Hiring unlicensed for this work is illegal for the contractor — and risky for you: no permit rights, no insurance backing, no recourse.
Work like this often requires a county permit — a legitimate pro pulls it, not you.
Basis: FL Stat. 489 (DBPR state licensing).
Your request goes to a single license-verified Foundation pro in your area — you stay anonymous until you tap connect, and we never sell your info.
Covered: Lee · Pinellas · Sarasota · Charlotte · Hillsborough · Manatee | As of 2026-07-15 | Local numbers appear only when the sample is large enough to protect privacy.