Federal Way, WA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- SE zone front yard
- 30 feet minimum
- SE zone side/rear yard
- 10 feet minimum each
- RS zone side yard
- 5 feet (10 feet on corner)
- SE minimum lot size
- 5 acres
- Enforcement
- FWRC 1.15.040, $100-$500 daily penalty
Summary
Federal Way's suburban estate (SE) zone requires a 30-foot front yard, 10-foot side yards and a 10-foot rear yard on any detached home under FWRC 19.195.010. In the single-family residential (RS) zones, FWRC 19.200.010 sets a five-foot side yard, rising to 10 feet on the street side of a corner lot.
Required Yards ... Front Side (each) Rear ... Detached dwelling unit ... 5 acres 30 ft. 10 ft. 10 ft. 10% ... 30 ft. above average building elevation ... [FWRC 19.200.010] 3. Side yard setback is five ft. Corner lot side yard for that portion of the lot adjacent to the street is 10 ft.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 26-1049, passed August 11, 2026).
Full Breakdown
Yard setbacks in Federal Way are set zone by zone in the use-zone charts of FWRC Title 19, Division VI. 010 requires a 30-foot front yard, 10-foot side yards on each side, and a 10-foot rear yard for a detached dwelling unit, alongside a 30-foot height limit above average building elevation and a 10 percent maximum lot coverage. The single-family residential (RS) zones use a different pattern. 010 sets the side yard at five feet in the standard case, doubling to 10 feet for the portion of a corner lot's side yard that runs along the street rather than the interior lot line.
180, so a detached ADU follows the same five-foot, or corner-lot 10-foot, side setback as the primary house. Where a structure or portion of a structure in the SE zone sits within 100 feet of a low-density use, an added limit kicks in: that portion of the structure must either stay under 15 feet in height or keep its facade parallel to the low-density use under 50 feet long. 350 makes clear that no building may be erected, altered, enlarged or moved in a way that encroaches on the required yard for its district.
Violations & Fines
Building within a required front, side or rear yard, whether a 30-foot SE zone front yard or a five-foot RS zone side yard, violates FWRC 19.195.010 or FWRC 19.200.010 and FWRC 19.05.350's ban on encroaching on required yards. The city enforces the violation under FWRC 1.15.040: a notice and order to correct, then a daily penalty starting at $100 for a first violation and increasing to $500 for repeated violations of the same kind.
Frequently Asked Questions
How big does a front yard have to be in Federal Way's suburban estate zone?
What is the side yard setback for a single-family house in Federal Way?
Do accessory dwelling units follow the same setback as the main house?
Sources & Official References
Other rules in Federal Way
Compare Federal Way to another location·View the Washington building setbacks & zoning overview
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Setback Rules in Nearby Cities
How other cities in King County handle setback rules.