Deck and Patio Rules

An outdoor platform or paved area, including raised decks, landings, stairs and guard rails.

What typically applies

These are patterns seen across many US jurisdictions. They are not the rule at your address, because zoning is adopted locally.

• Low platforms under a threshold height, often around 30 inches, are frequently exempt from a building permit.
• Guard rails are commonly required where the walking surface is about 30 inches or more above grade.
• Guard height and baluster spacing follow the adopted building code for the jurisdiction.
• Stair geometry, including riser height and handrails, is regulated by the building code.

What most often changes the answer locally

• Height of the walking surface above adjacent grade.
• Whether the deck is attached to the house or free standing.
• Setbacks from property lines and from utilities or easements.
• Impervious surface or stormwater limits for patios.
• Snow, wind and seismic requirements adopted locally.

Get a checklist for your address

Questions to ask your local department

1. Confirm the permit threshold height and whether it applies to attached and detached decks alike.
2. Ask for guard rail height, opening limits and stair handrail requirements.
3. Confirm setbacks and whether the deck counts toward lot coverage or impervious surface.
4. Ask whether footings require inspection before the deck is framed.

See all project types on the yard rules hub, or use the yard rules checker for a different project.

ZoneFig provides general reference information, not legal advice. Yard and zoning rules are adopted locally, so the only binding answer for your address comes from your city, town or county planning and building department. Typical thresholds shown here describe patterns across many jurisdictions and are not the rule at any specific property.