ADU Rules by State:

What to Know Before You Build

ADU Rules by State: What to Know Before You Build

← Back to List

Next Article →

The fastest way to know
if an ADU will work on your property

  • Zoning: Are ADUs allowed in your zone (and which types: attached, detached, garage conversion, basement)?
  • Lot + setbacks: Is there enough buildable envelope once setbacks, easements, and height limits are applied?
  • Parking: Do you need replacement or extra spaces, and are there exceptions (e.g., near transit)?
  • Owner-occupancy: If required, does it apply to the main home, the ADU, or both? For how long?
  • Permitting path: By-right vs discretionary review (hearings = time + uncertainty).
  • Utilities: Separate meters? Fees for new connections? Sewer/water capacity constraints?

Looking for the full decision flow? Start with our feasibility guide:

Next Page →

Then, when you’re ready to pick a partner, jump to:

Next Page →

Important:

This page is a friendly starting point—not legal advice. ADU rules can change, and most of the rules that matter day-to-day are set by your city or county. Always verify the latest requirements with your local planning department before you design or buy a unit.

Search Your ZIP Code

State-by-state overview

Search
Sorted By

Subscribe to Our Email Newsletter

Get practical guidance on prefab, modular, and ADU options — delivered to your inbox. No hype, no sales pressure.
Search Your ZIP Code

Where to Go Next

Can I Build This Where I Live?

Can you build a prefab home or ADU on your property? Learn how zoning, lot rules, utilities, and access affect feasibility—before contacting builders.
Visit Page
0
Shares