My guess is Bond for Deed?

A bank, or credit union, or anyone issuing a mortgage, can earn 5% interest from treasury bonds, or a money market account.

I'm not clear on that relationship) performs the materials sourcing and labor sourcing (i.e. subcontracting) which usually fall under the care of a license/bonded/insured GC in order to circumvent the limits that are placed on unlicensed owner-builders. 

Also, I'll add in that in Orange County (most of Orlando) the minimum length is 7 months, if it's within an HOA, they may have a 12 month minimum.

Requirements for becoming a lender will vary from state to state, but at minimum, whomever operates/manages the company will likely have to meet industry experience requirements and will need to meet capital/bonding/licensing requirements specific to Texas.

My wife was raised to only put money in CDs or savings bonds. 

Mortgage bonds have multiple alternatives they weigh against.

DON'T GET STUCK WITH A LENGTHY REHAB JOB!

Engelo Rumora, you can get up to 8% with Corporate Bonds and 12% with Covered Call ETF's. 

Then getting legal requires Liability Insurance, Bond, Workers Comp , Etc.If you do all this, you will probably lose money the first few years while you learn the ropes....but after that you can expect to make about 20% for Overhead And Profit .