A new roof is one of the biggest jobs on a house, yet in several Puget Sound cities a plain re-roof needs no permit at all. In others, every one does. What usually decides it is not the shingles, but what happens underneath them.
What usually triggers a permit.
- Replacing or adding roof sheathing (decking)
- Changing the roof framing, pitch or roofline
- Adding or moving skylights or rooftop equipment
- Switching to a heavier material, such as concrete tile
- Laying a new layer over the old roof — in some cities
City by city.
As each city describes it for single-family houses (September 2026):
- Seattle: no permit to re-roof a house or townhouse when the building envelope doesn’t change beyond adding or replacing insulation.
- Bellevue: no building permit when sheathing repairs stay within five 4×8 sheets.
- Kirkland: like-in-kind re-roofs that leave the sheathing in place are exempt; sheathing, skylights or rooftop equipment need a permit.
- Redmond: lightweight coverings — composition or metal under 4 lb per sq ft — are exempt.
- Renton: replacing sheathing needs a re-roof permit; framing changes or heavier roofing need a building permit.
- Tacoma: tearing off and replacing with the same roofing is exempt; a new layer over the old one needs a permit and a pre-roof inspection.
- Everett: every re-roof needs a permit.
- Issaquah: like-for-like re-roofs without sheathing work are exempt; sheathing, tile roofs, pitch changes and skylights need a permit.
Rules change
These summaries are a starting point, not a ruling. Confirm with your city before work begins — each city page links to its permit office.
Overlays: the state rule.
Washington builds its residential code on the International Residential Code, which does not allow a new roof over two or more existing layers, over slate or tile, or over a roof that is water-soaked or deteriorated. A tear-off also shows the condition of the decking — and soft decking can turn a simple re-roof into a job that needs a permit.
Who applies for the permit?
Often the contractor, but put it in the contract: who applies, who pays the fee and who books the inspections. Whoever does the work must be registered with Washington L&I — it is unlawful for an unregistered contractor even to bid on the job.
Once you know what your city requires, a planning range for your roof and these questions to ask a contractor are the next step.