Rebecca Möller turns garages into apartments using wall panels and parts prefabricated in a factory. She installs nice finishes and appliances to make livable accessory dwelling units, or ADUs. Her ...

NEWMARKET, N.H. — Aside from an extra mailbox, there’s little indication from the street that Ron Durand’s lot is home to two homes. But tucked above the garage is a two-bedroom apartment, where his ...