When do I need a special permit, variance or site plan approval?

The Town of Wayland Zoning By-Laws, establish specific dimensional requirements and allowed uses within various Zoning Districts.  The Zoning Act (M.G.L. Chapter 40A) defines the statutory requirements and process to follow for each of these types of relief to obtain the necessary approvals.  The Board having jurisdiction may vary depending on the type of relief requested.  In any case, it would either be the Zoning Board of Appeals or the Planning Board.