I think one point to consider when building your own model in TV, will you be in the area for the coordination / you being the general contractor for your additions, vs having it done by TV builders. We were not there, so we had everything selected through the design process. . . The pricing or margin on construction items are generally highest with skilled labor and smaller priced items, electrical etc, being the obvious one. . . however, there are also items that one should consider having installed at time of construction which are big items in a home renovation or can go wrong or difficult as an addon..
Our list of "do it right the first time" were stretches, legal bedroom count, floor types and countertops, electrical and smart (internet/ethernet) home wiring, including switch control locations, under counter lighting, and solar tubes. After that, the builder's choice was fine, and we will replace when we live there.
The pieces we missed was installing the home re-circulating hot water because we didn't realize the amount of heat loss in the foundation during the winter, as well as thinking about a pantry in the begonia's kitchen side of the walking closet.
I wrote up a small "home internet and electrical wiring design" somewhere here, you can search for it.
But suggestions on this site are the best to consider, and I would recommend moving down prior to close, and renting for a month or two to have everything in order prior to closing. . . a lot easier than doing everything at once.
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