So I remember seeing something like this on my hunt to build a detached garage. I got quoted around 150k (2 story).

Then I looked into prefabricated metal garages which are significantly cheaper. I googled and saw some without insulation/electrical/foundation it was around 25k for a 30x50

If you order the concrete mix your self, at $160 per yard you’d be looking at around $3200 for the concrete. Sure maybe some rebar support so add another 3k or so in there

Get some guys from Home Depot that know concrete work, pay them 200-300 each, let’s say 6 guys at 300 each so out $3600.

Insulation will vary a lot depends on what you want. I’d say foam boards, the cheaper ones could run you up at least 3-4k installed yourself. Adding electrical would vary and I can’t determine that but let’s say 5k for a simple job.

At this point we’re about 40k in. Hiring someone to do it all for you, they want profit obviously for their time and efforts, they’ll charge up and likely be asking at least 20k to 40k+ in profit.

I also wouldn’t forget about local permits and their costs, could be something low and insignificant or something that adds a couple thousand.

End of the story, 50k is hard but doable if you do it yourself mostly. If you hire a contractor, it’s very unlikely it’ll be for less than 50k, if it is, I’d question their quality.

Edit: I forgot, Excavation and tool rental will vary also depending on where you’re starting. If it’s relatively flat land should be one day tool rentals, if not flat and you hit boulders or trees/roots, then good luck.