When do I need to get a building permit?

Do people research your files before they purchase a house or commercial property to see if the proper permits have been obtained and the work inspected?

Can I do my own plumbing or gas work?

Can I do my own wiring?

Who can answer my questions about setback requirements and other zoning questions?

Where can I get a certified plot plan?

Does the Building Department have any brochures that I can access?

Will any penalties result if I do work without the required permits?

How much does a permit cost?

Do inspectors carry identification?

I'm new to Norwood, can you recommend a builder, roofing contractor, plumber, electrician, engineer, land surveyor, etc.?