Zoning fundamentals

Learning objectives

• Explain what zoning is, where its authority comes from, and how it implements the comprehensive plan.
• Describe the parts of a zoning ordinance: the map, the text, districts, uses, and dimensional standards.
• Distinguish permitted, conditional (special), accessory, and prohibited uses.
• Explain how overlay and floating zones work.
• Identify who administers zoning and how text and map amendments are made.
• Describe how zoning is enforced and how codes adapt to newer uses such as short-term rentals.

Key concepts

What zoning does

Zoning divides a jurisdiction into districts and sets rules for each: what uses are allowed, and how big, tall, and dense development can be. It's an exercise of the police power, delegated to local governments by state enabling acts (see Foundations of land use law).

Zoning is one of several plan implementation tools, alongside subdivision regulations, the capital improvements program, the official map, incentives, and public-private partnerships. The comprehensive plan sets long-range policy; the zoning ordinance turns it into enforceable, parcel-level rules. A comprehensive plan is a policy guide; the zoning ordinance is a regulation.

9 more sections follow in the full lesson.

Key terms

• Zoning district: An area of the map with its own set of use and dimensional rules.
• Euclidean zoning: Conventional zoning based on separating land uses into districts.
• Cumulative zoning: A system where "higher" uses are allowed in "lower" districts.
• Permitted (by-right) use: A use allowed administratively if standards are met.
• Conditional (special) use: A use allowed after discretionary review against stated standards.
• Accessory use: A use incidental and subordinate to the principal use on the same lot.
• Setback: The minimum distance a structure must be from a lot line.
• Lot coverage: The share of a lot covered by buildings or impervious surface.
• Overlay district: A district that adds standards on top of the base district.
• Floating zone: A district defined in the text but mapped only when applied to a property.
• Text amendment: A change to the zoning ordinance's rules.
• Map amendment (rezoning): A change to the district designation of land.
• Hearing examiner: An appointed official who holds quasi-judicial hearings in place of a citizen board.
• Certificate of occupancy: The approval confirming a building complies before it's used.
• Notice of violation: A written notice describing a code violation and the time allowed to correct it.
• Abatement: The government correcting a violation itself and charging the owner.
• Short-term rental: A dwelling rented to visitors by the night or week, often through an online platform.