If a new structure is being built in the mountains, the wildfire regulation will have to be met. Before a Certified Jefferson County Defensible Space Forester can do a site check, you will need a Wildfire defensible space permit, obtained at the Planning and Zoning department (see Defensible Space Contact form (PDF) and fees (PDF)). This can be applied for prior to or at the same time as the building permit. Bring a site plan with you at the time of application. There is a certain amount of risk in doing it prior to the building permit, primarily, that the structure may not end up where anticipated prior to the wildfire review. Wildfire regulations will also apply to any additions or decks.