The cost of wasted materials after you have done it the wrong way, and the professional consulting to get the mistakes fixed, can be a difficult and expensive learning experience. A professionally built home instills confidence. There is a common misconception that the builder adds excessive profits to the total home costs and some people think they can avoid paying the extra charge by building the house themselves. In order for this statement to be true the novice builder and the professional builder would have to have the same net costs. The professional's net cost will always be lower.
Construction is a competitive industry and profit margins are lean.
There is not a lot of money to be saved by acting as your own general contractor. You might be pleasantly surprised at how little it really costs to hire a professional. When you take on the responsibilities yourself, you may find that you cannot hire the better sub-contractors when you would like because they are already booked. Those who have chosen the route of self-contracting commonly speak of frustration, costly delays and headaches. Although they were in direct contact with the subtrades and were able to make their own decisions every step of the way, they were overwhelmed by the sheer volume of decisions to be made.