Detached Accessory Building used as tool shed, storage shed, playhouse, or similar use where the floor area is greater than 120 sq. ft. A building permit is not required for under 120 sq. ft.
If you're adding a new window or door or changing the size of an existing one, then you are changing structure. The reason you need a permit for this is to ensure the continued safety of people in the home when structural changes are made. Why not just get a permit?
While replacing existing interior doors with new wood interior doors typically does not require a permit, adding new doors or making structural changes often does.
A building permit is required when any structural change or major alteration is made to an existing building or when any new construction is undertaken. Normal building maintenance does not require a building permit in most instances.
A building permit is required for the construction, renovation, alteration, repair, relocation, demolition, use, and occupancy of any building, structure, or portion thereof.
Some examples of work that does not need a permit are: Painting. Plastering. Installing new cabinets Plumbing Fixture Replacement. Resurfacing floors Non-structural Roof Repair.