Both numbers are well below what Brown said. Heâd said that the elderly account for two-thirds of the cost, when in fact theyâre just over 20 percent, and that children account for one-third, when theyâre actually less than 20 percent.
A 20-by-20-foot garage totalling 400 square feet would cost between $16,000 and $24,000 without an apartment, and anywhere from $20,000 to $35,000 with an apartment.Homeowners who are skilled at construction and can do some or all of the work themselves can cut an enormous amount off of those numbers. 20-by-20-foot garage totalling 400 square feet would cost between $16,000 and $24,000 without an apartment, and anywhere from $20,000 to $35,000 with an apartment.
My partner and I had a well-regarded garage contractor (Angie's List) give us a guesstimate of $80,000. Another contractor would not give us an estimate, but insisted we needed an architect in addition for the apartment design and suggested we ask him how much it would cost.ou may be able to save some money by not working with an architect, and instead use a contractor who has some stock plans for a garage/apartment design. A talented builder should be able to use some stock plans to build you a garage which complements your home and meets your specific needs.