Mother In Law Suite

A mother-in-law suite can add real value to a home, but how much depends on whether it’s legal, finished living space, how it fits the house, and who your future buyers are. Here is how to think about cost, appraisal and resale in New Jersey and on the Main Line.

See what a home addition costs in 2025. Explore cost per square foot, price ranges by type, and key budgeting tips from MAG Development.

Thinking about a mother-in-law suite addition? Learn about costs, types, design options, and how an ADU can add value to your home.