Construction cost estimates/guides

[Ryan Dickerson]

I'm a new investor in Seattle and have been analyzing flips, short-term, and long-term rentals using Dealcheck and some proformas that local agents and investors have sent me. Does anyone have a trusty renovation/construction estimate calculator or guide they use for our market? 

I have used Coach Carson's recommended spreadsheet from "Woman Builder" (linked), and it's excellent for listing all the various cost categories I may confront on a project. However, I haven't found a good source for quick estimates based on the size of the project, year of build, etc., specific to our market. I'm still looking for a general contractor, but I don't have regular deals to make a GC's time valuable when estimating each job. I want to assess independently before reaching out and doing further due diligence with experts. 

Any recommendations?