Can't build projects fast enough help!

[John Mathewson]

So our flip company is doing very well, we are finding plenty of great houses and have several good investors right now, Problem we are having is getting our houses built. Some of our houses sit for 2 weeks before we start construction. We use a great contractor who is a part of our company and does phenomenal work. However his crew can only do so much. Looking for some insight on how to scale our company to rehab more houses. Currently we are on track to do 20-30 our first year. Next year we would like to get to 50-60. any thoughts would be greatly appreciated!