https://www.homewyse.com/
I saw a mention of the website above in a Money magazine article about home improvement projects, so I checked it out and thought it was worth passing along.  It’s a price calculator for home renovation and maintenance projects.  You select a project, make some choices about the scope of the work, the quality of the materials and the type of contractor, enter your zip code, and they give you a rough estimated range for the cost.  I found this really interesting.  I cannot vouch for the accuracy of their numbers, but there is information about their methodology and sources on the site (under the Reference menu at the top).  Whether or not their numbers are very accurate, it could be useful in getting a sense of the factors that determine the cost of a particular project that you’re contemplating.