Washington · Chicken coop guide
How to build a chicken coop in Washington
Small coop with attached predator-proof run. A predator-proof coop and run keeps a small backyard flock safe. Local ordinances on hen count and setbacks vary widely.
Typical cost
$1,454–$2,310
Time
2–4 weekends
Skill
Intermediate
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Permits & code in Washington
Seattle allows 8 hens per lot without a permit. Most jurisdictions require the coop to be set back 10–25 ft from lot lines and neighboring dwellings. Seismic bracing requirements apply to sheds and garages in the western half of the state.
State-level rules only — cities and HOAs frequently add stricter requirements. Always confirm with your local building department before you dig.
What most people get wrong
- Using chicken wire for the run. Raccoons rip through it. Use ½" hardware cloth.
- No apron — predators dig under in one night. Bury or splay hardware cloth 12" out.
- Skimping on ventilation. Ammonia buildup causes respiratory disease even in cold weather.
The 5-step chicken coop plan
- Step 1Confirm site and permit pathLocate property lines, call 811 for utility marking, and check whether your city/HOA needs approval before you break ground.
- Step 2Order materialsUse the shopping list from our planner. Confirm delivery vs pickup — bulk lumber and concrete are usually cheaper delivered.
- Step 3Lay out and prep the siteBatter boards, string lines, level the base. Getting this right saves days later.
- Step 4Frame the structureFollow the cut list. Check for square with the 3-4-5 method every few pieces. Fasten with the right structural screws.
- Step 5Finish and inspectSand, stain/seal, and (if required) schedule your final inspection before backfilling or closing anything up.
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