Federal Way, WA Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- Governing sections
- FWRC 19.110.050 and 19.200.010
- RS zone height cap
- 30 ft above average building elevation
- Rooftop appurtenance allowance
- +4 ft if under 10% of roof area
- Antenna exception process
- Process I administrative approval
- Ham radio tower process
- Process III review required
Summary
Federal Way caps detached houses in its single-family residential zones at 30 feet above average building elevation, per the RS-zone use chart at FWRC 19.200.010. FWRC 19.110.050 makes that ceiling absolute: no element of a structure may exceed the applicable limit except the narrow rooftop and antenna exceptions the code lists separately, so builders cannot argue extra height by default.
No element or feature of a structure, other than as listed in FWRC 19.110.060, may exceed the applicable height limitation established for each use in this title. ... Detached dwelling unit ... 30 ft. above average building elevation ... Rooftop appurtenances may exceed the applicable height limitation by a maximum of four feet, if the area of all appurtenances and screening does not exceed 10 percent of the total area of the building footprint.
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
0 designation at 5,000 square feet; the 30-foot cap does not vary by lot size. 060's short exceptions list. Rooftop appurtenances, vents, mechanical penthouses, and similar equipment can exceed the 30-foot line by up to four feet if the combined footprint of all appurtenances and their screening stays under 10 percent of the building's roof area, and any such appurtenance still has to be screened from streets and neighboring properties. Antennas get a separate path: rod, wire, and dish antennas can go above the cap through a Process I administrative approval if the applicant shows nearby views are not substantially impaired and the antenna has to sit above the roofline to work.
A noncommercial amateur radio tower needs the more involved Process III review, and the city must find the tower is sited to minimize visibility, is no taller than necessary to operate, and will not interfere with neighbors' radio or television reception. Every other structural feature, from gables to decorative parapets, is measured against the flat 30-foot line with no administrative flexibility built in.
Violations & Fines
Building or altering a structure that exceeds the 30-foot residential height limit without qualifying for one of the FWRC 19.110.060 exceptions is a zoning code violation. The city can deny or condition the building permit, require the applicant to redesign or cut down the noncompliant element, and withhold final inspection and occupancy until the structure is brought within the applicable height limitation established under FWRC 19.110.050.
Frequently Asked Questions
How tall can a house be in a Federal Way residential zone?
Can rooftop equipment go above the height limit?
What if I want an antenna or amateur radio tower taller than 30 feet?
Sources & Official References
Other rules in Federal Way
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Structure Height Limits in Nearby Cities
How other cities in King County handle structure height limits.