You probably need a permit in Seattle if your project involves new or changed property uses or construction or alteration of a building — even if you can’t see the alteration from the outside. For a quick reference to what permits you need, see:
Even if a permit is not required, your project must meet all code requirements and development standards. You can find information about electrical, plumbing, side sewer, construction, and land use permits on the Permit Types page.
Some small projects do not need a permit. You can find a list of exceptions in:
Unless you’re in an environmentally critical area, the following projects usually don’t require a permit.
Minor repairs or alterations. You don't need a permit for minor repairs or alterations that cost $4,000 or less in any 6-month period. You need a permit for any work on load-bearing supports, changes to the building envelope, and work that reduces egress, light, ventilation, or fire resistance no matter how small the project.
Miscellaneous work. These projects usually don't require a permit:
Buildings and landscaping. You usually don’t need a permit for
Platforms, walks, and driveways. You do not need a permit for these if they are less than 18 inches above grade and not over a basement or other building story.
Roofing and siding replacement. In detached one- and two-family houses, you do not need a permit to replace existing roof sheathing or to repair the roof only you are not making changes to the building envelope and the work is as good as the existing structure.
Dish and panel antennas. You don’t need a permit to install dish and panel antennas that are 6.56 feet (2 meters) or less in diameter or diagonal measurement.
Underground storage tanks. You do not need a permit from us to remove or replace underground storage tanks that are subject to regulation by a state or federal agency. A Seattle Fire Department permit is required to remove, replace, and decommission underground storage tanks.