Sinkhole Warning Signs: What a Florida Inspection Shows

When a buyer in Orange, Osceola or Seminole County sees a crack running across a wall, the word “sinkhole” tends to come up fast. In most cases the cause is something far more ordinary. A home inspection is a good way to document what is visible and sort the worrying signs from the harmless ones, but it has a hard limit that every buyer should understand before the inspection day.

Key takeaways

• Cracks, sticking doors and uneven floors can point to ground movement, but they also have many common causes.
• A licensed home inspector documents what can be seen. Confirming a sinkhole requires a licensed professional geologist or engineer.
• Look-alike problems such as leaking drain lines and old septic tanks are common in the region.
• Photos, dates and measurements taken early make any later evaluation more useful.

Warning signs the state tells homeowners to watch for

The Florida Department of Environmental Protection publishes a list of signs that can accompany developing ground movement. Inside the house, they include:

• New cracks in walls, ceilings or floors
• Floors that become uneven or slope
• Windows and doors that become hard to open or close
• Gaps developing in trim and moldings
• Cabinets and drawers that stop lining up

Outside, the list includes cracks in the foundation or exterior walls, depressions or cracks in the yard, water pooling along the foundation, exposed rock that is not normally visible, separation in paved surfaces, and leaning trees or structures. None of these proves anything by itself. Several appearing together, and getting worse over time, is what raises the level of concern.

The look-alikes we see more often

The same state guidance warns that other things mimic sinkhole damage: broken sewer or storm drain lines, collapsed septic tanks, rotting buried stumps, soil that was poorly compacted after earlier work, and expansive or organic soil layers that shrink as they dry. On a Central Florida lot that has been built on and landscaped for decades, a leaking pipe or an old stump is a far more usual finding than a void in the limestone. If a house has a septic system, our note on how inspectors evaluate septic systems and wells explains one source of soil trouble.

What a home inspection can and cannot do

Here is the limit we mentioned. The Florida Geological Survey states plainly that licensed home inspectors and insurance adjusters are not trained or qualified to determine whether a sinkhole or sinkhole activity is present. What an inspector can do is observe and record conditions: crack patterns and widths, evidence of past patching, door and window operation, slab and floor slope, grading, drainage and downspout discharge, and signs of plumbing leaks. That record is exactly what a geologist or engineer will want to see.

When the signs add up, the right next step is a referral. The state notes that a licensed professional geologist is required to determine whether a sinkhole or sinkhole activity exists, while a licensed professional engineer is needed to decide whether a structure has been structurally damaged. Methods such as ground-penetrating radar, resistivity surveys and soil borings can be used, but they are not always conclusive and they cost money, which is why they are reserved for houses that show real warning signs.

How to prepare for the inspection

• Walk the exterior first and photograph any cracks next to a ruler or coin so the width is clear.
• Ask the seller about past repairs, patching, foundation work or insurance claims.
• Note the date and weather. Heavy rain after a dry spell can change how a lot drains.
• Read the seller’s disclosure and ask for any engineer or geologist reports that exist.

Our own general inspection is the usual starting point, and you can book a home inspection online at any time. For the tricky “what if” about coverage, see how sinkhole coverage and deductibles work before you decide how much risk you are comfortable carrying.

Repaired sinkholes and past claims

If a report shows a house has a repaired sinkhole, ask for the engineer’s certification that stabilization was completed. The state’s position is that a repair certified by a licensed professional engineer and accepted by the homeowner’s insurer is generally likely to be safe, with the caveat that no one can guarantee the future behavior of natural systems. Our look at flood risk signs in a Florida home inspection shows a similar approach to documenting moisture and grading problems.

Sinkhole inspection FAQ

Does a crack mean there is a sinkhole?

Usually not. Hairline cracks from shrinkage and normal settlement are common. Wide, growing or stair-step cracks combined with sticking doors deserve a closer look.

Is sinkhole activity predictable?

According to the Florida Geological Survey, it is not currently possible to predict exactly when and where a sinkhole will develop. Activity is greatest after a period of drought followed by a return to normal rainfall.

Where can I read more from the state?

The Florida Geological Survey sinkhole FAQ and its homeowner’s leaflet are the best starting points.

Questions about an upcoming inspection in Central Florida? Call Quality Real Estate Inspections at 321-222-3116.