1. It Will Not Be Good Quality
A quality builder is someone who has spent years researching materials, techniques, building science, and investing in sub-contractor relationships that guarantee the best craftsmanship. Unless you are willing to spend the same amount of time preparing to build your own house, it will be nearly impossible to replicate the same finished product that a good builder can provide.
2. It Will Be MORE Expensive
The 15-20% savings by building the project yourself will re-appear in many ways, and probably be much more on the bottom line. You are likely to not consider everything needed for the job and run into critical delays and change orders along the way. Also, the time required to manage a project will result in increased stress, poor health, and time lost at your regular occupation.
3. It Will Take a Long Time
I already spent time discussing this in number 2, but the project will take a lot longer than expected. Even the best builders in the market have unexpected delays. Supply chain issues, sub schedules, and price increases all happen in a project. Compound those things with not knowing how to schedule a project, it drags out the construction process. We have all seen the 1/2 finished house around town; don’t let that be yours!