Coming on here to share my experience planning, designing, permitting and the construction process for our 380 sq ft Garage Conversion ADU. This ADU will be a 1 bedroom and 1 bath unit with full kitchen and bathroom. ...

Cleaners - we paid them a contract price per clean, which included labor for laundry and materials for cleaning (clorox/windex/floor cleaner etc.).

While I am currently looking for multi-family duplex/triplex with an eye to use BRRRRR in the north shore area (north of Boston suburbs like Chelsea, Revere, Saugus, Swampscott, etc) class B/C properties, I am wondering whether this strategy in a "tenant-super friendly" state like Massachusetts's with current high interest rates (and therefore high construction/materials/contractor costs) is worthwhile at this time.

40 gallon, natural gas, assuming the space it sits in doesn't have to be modified and the existing flu pipe is good:  Material $450, Labor $80, includes haul off of old heater.Same size, electric, assuming no mods to the wiring or space: Materials $350, Labor $80.Add $40 parts and labor if a shut off needs to be replaced. 

I created a couple of resource materials like a neighborhood graded map and a contractor rolodex for my out-of-state investors.

Is there another cheaper flat material i can use instead of fiberglass inserts?

It’s a lot of labor, but low material cost.

Reading material below: Happy to answer questionsSome people are not bringing it current.

Before installation they applied some material to smooth out any leveling imperfections.   

If you ended up in a property that has low grade materials, you can replace stuff more frequently than expected meaning higher costs than if you had done it yourself.