Setbacks & Height Limits in Tacoma

This guide explains the basic setback and height rules that apply to residential construction in Tacoma, Washington. These numbers depend on your exact zoning district, overlay zones, and lot geometry, so always confirm with the City of Tacoma Planning & Development Services 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 exterior wall, but eaves, bay windows, and chimneys follow their own projection rules).

Tacoma Municipal Code Title 13 (Land Use Regulatory 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 setback and one rear setback.

Typical Residential Setbacks

For Tacoma's most common single-family and low-density residential zones, the standard minimums are:

These are the base standards from Tacoma Municipal Code Title 13. Higher-density residential zones, mixed-use zones, and commercial zones all have separate setback schedules. Corner lots, flag lots, and lots on private streets may have modified requirements.

Height Limits

Maximum building height in Tacoma's R-1, R-2, and R-3 residential districts is 35 feet, measured from average grade to the highest point of the roof (or to a specified reference plane for pitched roofs).

Height rules can differ in:

• R-4 and mixed-use districts — generally allow greater height, often stepped based on setback from residential edges
• Historic districts and design review zones — height may be limited by context or design standards
• View-sensitive and shoreline areas — Tacoma's shoreline master program and view-corridor policies can lower effective height limits
• Airport influence zones — FAA Part 77 surfaces around Tacoma Narrows and JBLM can cap height well below the base zoning limit

Lot Coverage and FAR

Beyond setbacks and height, Tacoma residential districts also regulate bulk through lot coverage and, in some districts, floor area ratio:

• Lot coverage — the percentage of the lot that may be covered by buildings. R-1 and R-2 typically allow around 40% lot coverage for the main building, with additional allowances for accessory structures.
• Floor Area Ratio (FAR) — the ratio of total building floor area to lot area. Tacoma uses FAR primarily in its mixed-use center districts rather than low-density residential zones.

Always confirm the exact figures for your zone in Tacoma Municipal Code Title 13.

Common Exceptions and Encroachments

Tacoma's zoning code allows certain features to project into required setbacks. Typical allowances include:

• Eaves, gutters, and cornices (usually up to 2 ft)
• Chimneys (up to 2 ft)
• Uncovered porches, stoops, and steps
• Heat pumps and AC condensers (subject to sound and separation rules)
• Bay windows with limited projection

Fences, retaining walls, and accessory structures have separate rules — check the Tacoma Municipal Code chapter on accessory structures and fences.

Washington State Middle Housing & ADU Overrides

Two Washington state laws override parts of Tacoma's traditional single-family setback, density, and height rules:

• HB 1110 (2023) — Middle Housing — requires Tacoma to allow duplexes, triplexes, fourplexes, townhouses, courtyard apartments, stacked flats, and cottage housing on lots that were historically zoned single-family. The state sets minimum density floors that local zoning cannot undercut, and Tacoma must permit these housing types without discretionary review beyond what applies to a standard single-family home.
• HB 1337 (2023) — Accessory Dwelling Units — requires Tacoma to allow up to two ADUs per lot in most residential zones, caps minimum lot size requirements, restricts owner-occupancy mandates, limits parking requirements near transit, and constrains how restrictive setback and height rules can be for ADUs.

If your project is a middle-housing type or an ADU, the state floor — not Tacoma's historic base zone — governs. See the ADU rules page for this city and consult Tacoma Planning & Development Services for the current code amendments implementing HB 1110 and HB 1337.

How to Look Up Your Specific Requirements

1. Find your zoning district — use the Tacoma zoning map
2. Read the district regulations — open Tacoma Municipal Code Title 13 and find your zone's chapter for setbacks, height, lot coverage, and any FAR
3. Check for overlays — shoreline, historic, view-sensitive, and airport influence overlays can modify base rules
4. Ask planning staff — call Tacoma Planning & Development Services at (253) 591-5030 for a free zoning information review before you commit to design

Variances

If your project cannot meet the strict letter of Tacoma's zoning code, you may apply for a variance — a formal request to deviate from the rules based on hardship specific to your lot. Variances are discretionary and typically require public notice and a hearing examiner decision. See the Variance Application Guide for the general process.

Official Sources

See the sources linked in the frontmatter for the Tacoma Municipal Code and Planning & Development Services. This guide is informational and is not a substitute for direct confirmation from planning staff.

Disclaimer: This guide provides general information about setbacks and height limits in Tacoma and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with the City of Tacoma Planning & Development Services or the Tacoma Municipal Code before making development decisions.