When do I need a building permit?

Sections 5110.3 and 110.3 of the Massachusetts State Building Code 780 CMR give exemptions for building permits. In general, a building permit is required for any work that is more than ordinary repairs of a structure.

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1. Do I need a building permit to build a fence?
2. Do I need a building permit to install / construct a garden shed?
3. When do I need a building permit?