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Portland, OR Building Safety: Building Permits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

Key Facts

Low-deck threshold
2-1/2 feet above grade
Under threshold
unlimited setback intrusion
Over threshold
max 20% of setback depth
Minimum lot-line clearance
3 feet
Administering agency
Portland Permitting & Development

Summary

Portland decks, stairs, and ramps no more than 2-1/2 feet above grade can extend fully into your required yard setback with no exception process; taller decks intrude only 20% of the setback depth and must stay 3 feet from the property line.

3. The following minor features of a building may extend into the entire required building setbacks: ... e. Decks, stairs and ramps that are no more than 2-1/2 feet above the ground. However, stairways and wheelchair ramps that lead to one entrance on the street-facing façade of a building are allowed to extend into the required setback from a street lot line regardless of height above ground; and

View official code

Full Breakdown

Portland City Code § 33.110.220 sets the setback rules for single-dwelling zones. Minor deck, stair, and ramp features no more than 2-1/2 feet above the ground may extend fully into the required building setback under Subsection C.3.e: no site-plan exception needed. Decks that exceed that height are treated as building features under Subsection C.1.c: they may intrude only up to 20% of the setback depth and must stay at least 3 feet from any lot line. Front setbacks for decks, balconies, and porches can also be reduced through setback averaging with abutting lots under Subsection D.1. Portland Permitting & Development administers zoning review citywide.

Violations & Fines

Building a deck taller than 2-1/2 feet without meeting the setback or the 3-foot lot-line clearance is a zoning violation, enforceable by Portland Permitting & Development, which can require the structure be relocated, cut down, or removed.

Frequently Asked Questions

Does a low deck need setback approval in Portland?
No. Decks, stairs, and ramps no more than 2-1/2 feet above grade can extend fully into the required building setback under PCC § 33.110.220.C.3.e, with no exception process.
What if my deck is taller than 2-1/2 feet?
It's treated like the house: it may intrude only 20% of the setback depth and must stay at least 3 feet from the lot line, per § 33.110.220.C.1.c.

Sources & Official References

Other rules in Portland

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All Portland rules

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