Delaware
Sinkhole Investigation
Ground penetrating radar, borings and engineering analysis to confirm or rule out sinkhole activity under a property.
What the work involves
In karst regions such as much of Florida, parts of Pennsylvania, Kentucky, Tennessee, Missouri and Texas, sinkholes form as limestone dissolves. A geotechnical engineer or geologist uses ground penetrating radar, borings and sometimes electrical resistivity to look for voids and raveling soils, then recommends grouting, underpinning or monitoring. Florida insurance law includes specific sinkhole testing procedures.
Local conditions we plan for
- Coastal flooding and storm surge
- Sea level rise and shoreline erosion
- Low lying terrain with high groundwater
- Stormwater management on flat coastal plain
Building code: No statewide IBC/IRC; codes adopted by local jurisdictions (ICC adoption chart, April 2026).
When you need it
- Sudden depressions or holes in the yard
- New cracks with sinking floors in a karst area
- Insurance sinkhole claim or denial
- Buying property in a known sinkhole area
Frequently asked questions
How much does sinkhole Investigation cost?
Across the US, sinkhole Investigation usually costs $800 to $6,000. A Tampa Bay buyer guide cites about $800 to $1,500 for ground penetrating radar screening and several thousand dollars for a full boring study (upper figure is an estimate). Citizens Property Insurance requires policyholders who demand testing after a denial to pay 50% of the cost, up to $2,500.
How long does sinkhole Investigation take?
Plan on 2 to 6 weeks from signed proposal to stamped deliverables, longer if a site visit, soil testing or a permit review cycle is involved.
Is a permit required for sinkhole Investigation?
Often not on its own, but the findings frequently lead to work that does need a permit. We tell you which parts of the follow-up work your local building department will review, and can prepare those drawings too.
How do I verify an engineer's license in Delaware?
Engineers practicing in Delaware are licensed by the Delaware Association of Professional Engineers (DAPE). You can confirm a license number and its status in the board's public license search before you sign a contract.
Which building code applies in Delaware?
No statewide IBC/IRC; codes adopted by local jurisdictions (ICC adoption chart, April 2026). Cities and counties can add local amendments, which is one reason to hire an engineer who works in your area.
What site problems do engineers see most in Delaware?
Common issues include coastal flooding and storm surge, sea level rise and shoreline erosion, low lying terrain with high groundwater and stormwater management on flat coastal plain.