re: Anyone convert attached garage into living space?

We have 2 two-car garages separated by a framed wall.

We looked into converting one of these into a bedroom, office and large walk in closet.

We had plans drawn up by architects and got a bid. For around 425sf, the bid we received to convert the space was $150k. We decided not to move forward with the project. We probably need to get another quote just to make sure, but even if that original bid is $50k over what another bid would be, it still makes 0 sense. We paid ~$175/sq ft when we bought in June 2022. Converting a garage for well above that cost is insane.

Our plans included:
- pouring new floors to match the elevation of the current indoor living area
- adding 2 windows where the garage door currently sits
- removing brick from an existing external wall to use around said windows to make the exterior look seemless (and replacing that brick with siding)
- removing existing driveway leading to converted space