Your estimate is way too high. At least in most parts of the country. I know because I’m building right now in a mid-priced coastal metro. A small monolithic s

Your estimate is way too high. At least in most parts of the country. I know because I’m building right now in a mid-priced coastal metro. A small monolithic slab foundation is maybe $8k at most. Running buried electric on a 20 foot setback is $2k. Water and sewer lines are $3k. The municipal water and sewer tap are $5k total. And the county capacity fee is $4k. Altogether these ancillary “hookup” costs are $20k, and that’s for a “get it done fast” job at a period of labor and material shortages.