How do I permit an addition to an existing house?

An addition to an existing house (like an additional bedroom) would require the following:

If you follow the checklist you should have everything that you will need. If you have potable water on the property already, you will not have to prove potable water again, however if there is a septic on the property and you are adding another bedroom, a septic review is required. We call septic reviews "O&M"s (Operations and Maintenance inspections); depending on the type of system you have you either do this inspection once a year or once every three years.

For your floor plan we would like to have a before-and-after. Your building plans should only show the new work that is being done.

Lastly, if your property is located within shoreline or critical areas we recommend that you meet with one of our land use planners first to verify that you will not need some type of land use permit. You can walk in and meet with a Planner Monday-Thursday 10:30-12:00; additionally, Planners are available for scheduled appointments Tuesday-Thursday 1:30-4:30. The charge is $50 for every 30 minutes. Book time with a Planner here:

Show All Answers

1. Do I need a permit for a small picnic pavilion on my property?
2. How do I permit an addition to an existing house?
3. Who do I talk to about preliminary questions about building a structure or developing my property in Jefferson County?
4. I want to build a stand-alone building to house my tools and it's over 400sqft, do I need a permit?
5. I'm wondering how I would go about finding information about the zoning and development potential of a property in Jefferson County.
6. Does Jefferson County requires a pre-pour inspection?
7. What do I need to do for a re-roof permit?
8. Where can I find a copy of the county code?
9. I am planning to install a fireplace insert. What forms do I need?
10. Do I need a permit to remodel a bathroom?
11. Is it the property owner or the contractor's responsibility to submit permits?
12. Does my ductless heat pump need to be installed above the flood plain?
13. What is the minimum height for a deck before it requires a rail?
14. Who do I call about installing road name signs?
15. How do I name a road?
16. What do I need to do to be able to do to demolish a building?
17. What do I need to submit if I only want to build a garage?
18. What are my permit fees? How do I get a fee estimate?
19. What are the rules regarding fences and gates?
20. What does it mean that me new address review has "triggered road naming?"