Plan check fee estimate

The Seattle Dept. of Planning and Development (Seattle DPD) has a spreadsheet available for download that calculates permit costs.

For a project valuation of $72,895, they charge $991.50 for plan review, and the same for permit fee. Total is $1,987.50, with $1,487.25 up front and $500.25 when the permit is issued.

They based the valuation on what I tell them it will cost to renovate existing areas, such as the bathroom, and $121.39/SF for additions ($46.77/SF for the garage). The additions guestimated at 250 SF = $30,647.50 plus the garage: 140 SF = $6,547.80.

I could tell them it was 0 SF addition, but $100,000 additional, and they would charge $2,529.50, so we can use 2.5% as a rough permit fee estimate based on our cost estimate. If it was $10,000, the fee would be $529.50 or 5.25%, so it goes up. $200,000 would be $3,479.50 or 1.75%.

The permit fee is around 2.5% of total valuation:

$10,000 5.25%
$100,000 2.5%
$200,000 1.75%

I don't know what other permits are necessary (plumbing, electrical, perhaps heating?)