Why an unlicensed contractor will end up costing you more

Police warn of unlicensed contractors

The owners of a Temple Terrace home paid twice for the same roofing job. John and Rita Oom learned one of their contractors had no license after losing $3,000.
Their roof was left half finished. No permits were pulled, and the contractor never returned to finish the work.
Detective Curtis Smith with Tampa Police Department’s construction fraud unit called it a typical scenario.
Smith finds the biggest mistake homeowners make is going with the least expensive quote and not checking for a license or complaints.
In the Oom’s case the oversight cost them thousands more than the original quote. They had to hire a legitimate contractor to come in and finish the job.
And the unlicensed types typically don't pull permits, so there's no county inspection to  ensure the job was properly done.
All licensed contractors are listed at MyFloridaLicense.com. 
You will also find their disciplinary history there as well. That is the Department of Business and Professional regulation. In Hillsborough and other counties, you can check on a license and complaints at the contracting licensing office.