Bellingham, WA Building Safety: Building Permits (2026)
Key Facts
- No permit if
- insulation-only, no structural change
- No permit if
- under 500 sq ft in 6 months
- Permit always required
- structural changes, any sheathing
- Pre-cover check
- roof sheathing inspection required
Summary
Bellingham skips a permit for small, non-structural reroofs, but requires one for any structural roof work or sheathing replacement, no matter the size.
23. Roof replacement under either of the following conditions: 23.1 In one- and two-family dwellings and townhouses if no changes are made to the building envelope other than adding or replacing insulation, and the insulation value is equivalent to or better than the existing structure; or 23.2 Where less than 500 square feet of roof sheathing or insulation is exposed within any 6 month period. Permits are required for structural changes and replacement of sheathing of any size. See Energy Code Sections R503.1.1, C503.1 and C503.3 for insulation requirements for existing buildings. Mechanical:
1. Portable heating, cooking, or clothes-drying appliances.
2. Portable ventilation equipment.
3. Portable cooling unit.
4. Steam, hot or chilled water piping within any heating or cooling equipment regulated by this code.
5. Replacement of any part which does not alter its approval or make it unsafe.
6. Portable evaporative cooler.
7. Self-contained refrigeration system containing 10 pounds (4.54 kg) or less of refrigerant and actuated by motors of 1 horsepower (746 W) or less.
8. Portable fuel cell appliances that are not connected to a fixed piping system and are not interconnected. Plumbing:
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 2026-06-015, passed June 1, 2026).
Full Breakdown
The Construction Administrative Code exempts roof replacement from a permit only in two situations: on one- and two-family dwellings and townhouses where the only change is adding or replacing insulation of equal or better value, or where under 500 square feet of roof sheathing or insulation is exposed within any six-month period. Outside those narrow conditions, any structural change or sheathing replacement of any size, a Building Division permit is required, and a roof sheathing inspection under Section 110.6.5 must clear before roof coverings go on, applicable citywide in Bellingham, Washington.
Violations & Fines
Structural reroofing or sheathing replacement without the required permit is a Construction Administrative Code violation: a civil infraction up to $2,050 (minimum $100), or a gross misdemeanor up to $5,000 and 364 days if done knowingly.
Frequently Asked Questions
Do I need a permit to reroof my Bellingham house?
Is sheathing replacement ever exempt?
Sources & Official References
Other rules in Bellingham
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