Those numbers really blow me away on the budget. $13,000 for a bathrom remodel? Are they getting a golden throne?? LOL!! I know that I am here in el cheapo Indiana so my costs are much lower on that. If I have to completely gut a bathroom it will probably cost me around $2,500 and that includes labor.
Probably $4,000 for a vinyl siding job, Vinyl window replacements, average double hung window is $200 a piece installed, and roof replacement is around $4,000 average.
Definitely a contract with the contractors. Ours are very detailed and have a penalty of $150 a day for each day they go over on the agreed time. Dealing with contractors in my opinion is the worst part of this business.
Again, my two cents.