Zoning Code Interpretation
Zoning and setback analysis for your Seattle or Eastside lot.
A focused written deliverable that interprets your city's zoning code as it applies to your specific parcel. Setbacks, lot coverage, height, HB 1337 application. 5 to 10 days.
Written by Aaron Elisha, founder of MNBE Construction & Development. WA license MNBECCD770R9. Updated 2026.
Code interpretation, on your specific parcel.
A zoning analysis pulls the specific code sections that apply to your lot, calculates the legal buildable envelope, and tells you in writing what your project can and cannot do. Setbacks, lot coverage, height limits, allowable uses, HB 1337 overrides.
Architects, builders, and homeowners use the analysis as the foundation for design. Without it, you can spend $10,000 on drawings that fail plan-check on a setback issue we could have flagged in week one.
What you get in the written analysis.
Zone identification
Your parcel's zoning designation, allowable uses, and any overlay zones (urban village, design review, landmark district) that apply.
Setback envelope
Front, side, rear, and any context-specific setbacks. Diagram showing the legal buildable footprint.
Lot coverage math
Total lot square footage, current coverage, allowable maximum, remaining coverage budget for your project.
Height limit + envelope
Maximum height for primary structure and ADU. Daylight-plane analysis if your jurisdiction enforces one.
HB 1337 application
Specific HB 1337 provisions that apply to your lot. Where state law overrides local code, with section citations.
Critical-area flagging
Whether your lot triggers steep-slope, wetland, stream, or geologic-hazard review. Recommendation for further study if so.
Where Zoning Fits
Zoning is step one of a longer process.
Broader
Feasibility Studies
Zoning analysis plus critical-area, utility check, and go/no-go recommendation.
See feasibility →
The Law
HB 1337 Explained
The state law that determines half the zoning answer for ADU projects.
Read the guide →
Step Two
Floor Plan Design
After zoning sets the envelope, the architectural design fills it. This is where layout becomes drawing.
See design →Frequently Asked
Zoning analysis questions Seattle homeowners ask before they sign.
Six practical answers from a builder who reads zoning code every week. If yours is not here, call us.
Still have questions?
We answer the phone Monday through Saturday. Two minutes on the call usually gets you further than an hour online.
A zoning analysis is a focused written deliverable that interprets the city code as it applies to your specific parcel. Setbacks, lot coverage, height limits, allowable uses, and HB 1337 application. A feasibility study is broader: it includes the zoning analysis plus critical-area screening, utility check, site visit observations, and a go or no-go recommendation. If you only need the code interpretation, the zoning analysis is the right product. If you need a full buildability picture, the feasibility study is.
HB 1337 sets the floor at five feet for most rear and side ADU setbacks across cities of 25,000 or more. Front setbacks remain at the standard for the zone, typically 15 or 20 feet. Some cities still impose a slightly larger setback on lots with critical-area triggers or alley access, and corner lots get their own treatment. Primary-home setbacks are not affected by HB 1337. We map the exact setback envelope on your lot before any drawings begin.
Lot coverage is the percentage of your parcel covered by buildings (and sometimes hardscape) under the local code. Most Seattle and Eastside residential zones cap total coverage at 35 to 45 percent. We calculate your existing coverage from city parcel data and architectural drawings, then determine how much remaining coverage budget any new structure has to fit inside. ADU footprints count toward this number.
Most Seattle and Eastside zones cap ADU height at 18 to 25 feet, depending on the zone and whether the unit is detached or attached. Pre-HB 1337 codes were sometimes stricter on ADU height than primary-home height. HB 1337 forbids that disparate treatment. We confirm your zone's specific height limit and any daylight-plane or solar-access overlays during the analysis.
On the items HB 1337 covers, yes. Two ADUs per residential lot must be allowed. Owner-occupancy requirements are banned. Parking minimums are eliminated near transit. Setback floors and lot-size minimums are capped. On items HB 1337 does not address (height, lot coverage, critical-area review, design review), the local code still rules. The zoning analysis maps out which rules apply where and which ones HB 1337 supersedes for your specific parcel.
Some homeowners do, and the result is usually wrong in subtle ways that catch up at plan-check. The Seattle SMC alone runs to thousands of pages. Determining which sections apply to your specific zone, your specific lot, your specific structure, and which ones HB 1337 has overridden requires day-to-day code work. We do this analysis weekly and we know which sections plan-checkers actually enforce versus which sit on the books unused. That is not knowledge a homeowner can reasonably build by reading.
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