When I was doing a house flip in Jurupa Valley, California inland Empire/Riverside and I was looking to do more flips in the inland empire Riverside, and inland Empire areasLooking for some good contacts or contractors or real estate agents who are Flipper friendly?  

My management company has recommended sending in their own contractor to make repairs as the tenant has concerns about mold growth. 

This will vary depending on if a handyman can do the job or a licensed contractor is needed.

My realtor recommended SDIRA Wealth, a company known for its high-volume new builds every year.

But if you build a solid team and do your homework, it can be extremely rewarding.If you’re interested, I’ve put together a lot of resources on the market that might help—happy to share.

However, if you're a W2 high income earner or business owner, I can't imagine it makes any sense to flip houses, mail mass post cards, wholesale, or build lead gen websites with the value of your time being better spent other places (such as learning about real estate and increasing your income through proven means), such as at your 9-5pm or growing your business, and your real estate is a long term process and you don't need "home run" deals to qualify or make it work.

My wife and I are looking into building a duplex on it.since I am still learning on investing in real estate.

Valuing your time and understanding your limits and skills will make a big difference in the equity you build, the quality of the work and your sanity. 

My wife works for Ferguson, and I know many contractors, so I can get a lot of materials at cost.

I just wonder about the quality of the new construction itself and the quality of contractors being used.