The Wisconsin Bureau of Consumer Protection wants to warn flood victims of scams by contractors.

"Sometimes these contractors show up immediately, collect money and then don't come back to finish work. Or the contractor starts asking for more money than the agreed-to price," said director Jim Rabbitt.

Rabbitt said the second wave of contractors goes door-to-door looking for repair work. In addition to shoddy work, they also start demanding more money.

More sophisticated outside contractors may contact local contractors and offer to be subcontractors, promising a percentage of each contract.

Rabbitt offered the following tips to flood victims:

Be wary of any contractor who knocks on your door.

Call the police or sheriff’s department to check them out.

Try to get a local contractor.

Call Consumer Protection (800-422-7128) to check out contractors.

Ask contractors if they are subcontracting your job.

Be on the lookout if local contractors are using outside subcontractors.

Get lien waivers from anyone that you pay for home repairs. It is vital to do this because if the person collecting the money doesn’t pay the supplier or workers, a lien could be put on your property. This can happen unless you have a lien waiver.

Avoid some problems by paying for materials themselves by dealing directly with the supplier.

Get a written contract -- with a start and completion date -- and warranty information. Have someone watch the work being done, if at all possible.

Ask your local building inspectors to visit your job site as frequently as possible. It is highly advised to request a copy of the contractor’s certificate of liability insurance.

For tips on hiring contractors, call the toll free hot line of the Wisconsin Department of Agriculture, Trade and Consumer Protection at 800-422-7128 or visit http://datcp.state.wi.us/