Our state licence number is stated on every estimate and every invoice, not just on request. Insurance and bonding documentation is available before you sign anything.
Any work that requires a permit gets one pulled in our name, and we schedule the municipal inspection ourselves. A contractor who suggests skipping the permit is not saving you money - they are removing the one check on work you will never be able to see again once the wall is closed.
The inspector does not work for us and does not work for you - that independence is the entire point. Their sign-off goes in your file, so the proof outlives the job.
