Setbacks & Height Limits in Portland

This guide explains the basic setback and height rules that apply to residential construction in Portland. These numbers depend on your exact zoning district, overlay zones, and lot geometry, so always confirm with the Portland Bureau of Development Services (BDS) before finalizing plans.

What Are Setbacks?

A setback is the minimum required distance between a building and a lot line. Setbacks are measured from the property line to the nearest point of the building (typically the wall, but eaves, bay windows, and chimneys can have their own rules).

Portland's Title 33 Planning and Zoning Code specifies front, side, and rear setbacks separately for each zoning district. Corner lots have two "front" setbacks (one per street frontage) and typically one interior side and one rear.

Typical Residential Setbacks (R5, R2.5, R7)

For Portland's most common single-dwelling zones — R5 (5,000 sq ft min lot), R2.5 (2,500 sq ft min), and R7 (7,000 sq ft min) — expect approximately:

These values come from Title 33.110 (single-dwelling zones). Higher-density RM zones, mixed-use CM/CX zones, and overlay-modified lots have separate schedules.

Height Limits

Maximum building height in Portland's R5, R2.5, and R7 single-dwelling zones is typically 30 ft, measured from average grade to the highest point of the roof. RM1 allows about 35 ft, and commercial/mixed-use zones like CM2 allow 55 ft or more.

Height rules get more complicated in:

• Environmental zones (e, c overlays) — protected natural areas with additional massing limits
• Design overlay zones (d) — Design Commission review may shape height and form
• Scenic view corridors — certain west hills and river-view areas cap height
• Historic / conservation districts — context-based height limits apply

Residential Infill Project (RIP)

Portland's Residential Infill Project (Title 33 amendments effective August 2021) fundamentally reshaped the single-dwelling zones. In R2.5, R5, and R7, RIP now allows:

• Up to 4 units per lot as a baseline (duplex, triplex, fourplex, or detached configurations)
• Up to 6 units per lot if at least three are regulated affordable housing
• Adjusted FAR and building coverage calibrated to encourage middle housing over a single oversized house
• Size limits on any single structure so a fourplex is not simply a McMansion with four doors

RIP keeps the underlying 30 ft height cap and the standard 10 / 5 / 5 setbacks but ties the allowed floor area to the number of units and level of affordability. This is one of the most ambitious middle-housing reforms in the United States and is the reason you will frequently see new triplex and fourplex projects in Portland neighborhoods.

Lot Coverage and FAR

Beyond setbacks and height, two other numbers shape how much you can build:

• Building coverage — the percentage of the lot covered by buildings. R5 typically allows around 50% building coverage.
• Floor Area Ratio (FAR) — Title 33 applies FAR to single-dwelling zones, scaled under RIP by unit count. R5 base FAR is around 0.5, with bonuses for adding units or affordable housing.

Common Exceptions and Encroachments

Title 33 allows certain features to project into required setbacks. Typical allowances include:

• Eaves and gutters (usually up to 2 ft)
• Chimneys (up to 2 ft)
• Uncovered porches, stoops, and steps
• Air conditioning condensers (subject to sound limits)
• Bay windows (limited projection)

Fences, retaining walls, and accessory structures have separate rules in Title 33.110.250 — check before building.

State ADU Overrides

If your project is an Accessory Dwelling Unit (ADU), Oregon state law (HB 2001 and SB 458) overrides many local setback and parking rules. Portland allows two ADUs per lot, with no parking or owner-occupancy mandate. See the ADU rules page for this city.

How to Look Up Your Specific Requirements

1. Find your zoning district — use PortlandMaps to look up base zone and overlays
2. Read the district regulations — Title 33.110 for single-dwelling, 33.120 for multi-dwelling, 33.130 for commercial/mixed-use
3. Check for overlays — environmental, design, historic, and scenic view overlays can significantly modify base rules
4. Ask BDS — the Bureau of Development Services offers zoning information by phone at (503) 823-7300

Variances (Adjustments)

Portland uses the term Adjustment Review for what other cities call variances. An Adjustment is a discretionary request to deviate from a specific Title 33 standard. Most Adjustments are Type II procedures with neighbor notice. See the Variance Application Guide for the general process, and Title 33.805 for Portland's specific adjustment procedures.

Official Sources

See the sources linked in the frontmatter for Portland's Title 33 zoning code and the Bureau of Development Services. This guide is informational and is not a substitute for direct confirmation from BDS planning staff.