How large of an addition can I make to my home?

This depends on many factors, including the size of your lot, the zone in which your property is located, the location of the addition, and available utility capacity. There is no single size limit that can be generalized, since each development would need to account for the unique conditions of the site. However, no addition may cause the property to exceed the maximum site coverage allowed in the zone. Site coverage is the amount of impervious surface on a parcel, including structures, paved driveways, sidewalks, patios, and other impervious surfaces. The maximum allowable site coverage differs by zone. Please refer to the appropriate chapter applicable to your zone in Title 17 of the Port Angeles Municipal Code to determine the maximum site coverage standard applicable to development on your property. In addition to ensuring that the proposed addition will not cause the maximum allowable site coverage to be exceeded, the addition must meet all other applicable dimensional and design standards applicable to the property. Setback information by zone is available through the following links: 

All building additions require that a building permit be obtained. Building permit application forms are available at You may find the guidance document available at helpful when preparing a site plan. If you have questions about building code requirements, the Building Division can be contacted using the contact information available at

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1. What zone is my property in?
2. Where are my property lines located?
3. How do I know whether a use is permitted on my property?
4. How can I learn more about the operation of short-term rentals in Port Angeles, Washington?
5. How large of an addition can I make to my home?
6. Do I need a permit to trim trees on my property?
7. Do I need a permit to open a business in my home?
8. How do I know if there is an environmentally sensitive area on my property?
9. What are the requirements for placing a park model on my property?
10. How do I report a nuisance happening in my neighborhood?