Consult your local building department for the definitive answer.
Typically, most remodel projects require some electrical system modifications and as such would require an electrical permit which must be pulled by a licensed electrical contractor.
Plumbing modifications or perhaps moving a wall would likewise require a permit and inspections.
We are a licensed, bonded and insured contractor and as such we are able to help you in the permit process and can work under your permit or we can request it for you.
If you are unfamiliar with building permits and inspection, try to not let the fear of the unknown keep you from considering your remodel.
Permits and inspections are there to help protect your investment.
We are very experienced in these processes and as such would be happy to offer reassuring expertise.