Setback rules establish the minimum required distance between a structure and the property's boundary lines — front, rear, and side setbacks are typically defined separately in local zoning ordinances, and these requirements directly determine the buildable envelope on a given lot, meaning the actual area where structures are legally permitted to be built, which is often meaningfully smaller than the full parcel size. Setback requirements vary by zoning district and sometimes by specific factors like lot size, corner lot status, or proximity to certain features. For a lot with tight dimensions relative to the intended structure, setback requirements can significantly constrain design options, sometimes requiring a variance request if a reasonable structure genuinely can't fit within standard setback lines given the lot's specific shape or size. Easements are a separate but related consideration — a legal right granted to another party (a utility company, a neighboring property owner, or a government entity) to use a defined portion of the property for a specific purpose, most commonly utility lines, drainage, or access. Easement areas are generally not buildable, or building within them requires special permission from the easement holder, since construction could interfere with the easement's intended purpose. Before finalizing any development plan, checking both the zoning setback requirements and any recorded easements affecting the property (found through a title search or survey) is essential, since combining these constraints determines the actual buildable area on a lot, which can be meaningfully different from what the raw lot dimensions might suggest at first glance. Skipping this step and designing a structure without confirming these constraints first is a common and costly planning mistake that can require expensive redesign once discovered.