Zoning and Land Use Overview
Zoning regulations govern how land can be used and developed, shaping a project before design even begins. The ARE tests your ability to interpret zoning parameters and understand the processes for seeking relief from them, primarily in PA and PPD.
Use Districts
Zoning divides land into districts (residential, commercial, industrial, mixed-use) with permitted, conditional, and prohibited uses. Overlay districts add supplemental requirements (historic districts, flood zones, design review areas) on top of the base district.
Setbacks
Minimum distances a building must be located from property lines (front, side, rear yards), establishing the buildable envelope. Setbacks may vary by street classification, adjacent zoning, or building height.
Floor Area Ratio (FAR)
FAR is the ratio of total building floor area to lot area. A FAR of 2.0 on a 10,000 sf lot permits 20,000 sf of gross floor area, regardless of how it is distributed among stories. FAR controls overall building bulk and density.
Lot Coverage
The percentage of the lot covered by building footprint (as opposed to floor area across all stories). Lot coverage limits control ground-level open space, landscaping, and stormwater management even where FAR would otherwise allow more building area.
Height Limits
Maximum building height, sometimes combined with stepbacks or height planes that slope from the property line to protect access to light and air for neighboring properties.
Zoning Relief Processes
| Mechanism | Purpose | Approval Body |
|---|---|---|
| Variance | Relief from a specific dimensional requirement due to unique hardship | Zoning Board of Appeals |
| Special/conditional use permit | Allows a use not permitted by-right, subject to conditions | Planning Commission/Board |
| Rezoning (map amendment) | Changes the zoning district classification of a parcel | Legislative body (city council) |
| Planned Unit Development (PUD) | Custom zoning negotiated for a specific large-scale project | Legislative body |
Variances generally require proof of practical difficulty or unnecessary hardship unique to the property (not self-created), while special permits allow uses the code anticipates but requires case-by-case review for compatibility.
Nonconforming Uses and Structures
Buildings or uses that predate current zoning and do not comply with it may continue as "legally nonconforming," but expansion, reconstruction after significant damage, or extended discontinuance can trigger loss of that status.
Coordination with Site Design
Zoning parameters directly shape the buildable envelope analyzed during Site Analysis and must be verified alongside building code requirements - see Code Compliance for how zoning and building code review intersect. Site coverage limits also affect stormwater strategy; see Stormwater Management.
Exam Tips
- Practice FAR calculations - a common quantitative item type.
- Know that variances address hardship on dimensional standards; special permits address allowed-but-regulated uses.
- Remember zoning and building code are separate, parallel approval tracks that must both be satisfied.
Zoning fundamentals are essential for PA and PPD - start practicing free on AREprep.