The first easy way to save lots of money is to plan it right the first time. As another member just pointed out, everything that is done to the system most likely will need some sort of approval and inspector to visit. So if you only need one of each, that alone can save hundreds of dollars.
The other big way to save money is to do more labor. Everyone who contributes to the project is going to cost money. Most of these people are specialists and charge a lot. Some of them are necessary, others not so much. It depends on your skills, abilities, and initiative as to how much sweat you want to invest.
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