Is there such a thing as a valid verbal
contract? If you offered to do the work,
the customer accepted your offer, and
you can demonstrate what the deal
was, then yes, your verbal contract is
probably enforceable. There are some
exceptions, however, such as a contract
with more than four payments, or
a contract that exceeds a certain
amount of money and, therefore, in
some states must be in writing.
The kicker is demonstrating what the
deal was. Proving offer and acceptance
can be easy, especially after you have
already done the work. The simple fact
that the customer allowed you to perform
the work is compelling evidence
that you and your customer had agreed
to something.