What is a secondary unit?

A secondary unit, also called an accessory dwelling unit (ADU), granny flat, in-law unit, or backyard cottage, is an additional unit of housing added to a parcel of land containing a single-family home. These secondary units can be attached to the main home by converting an extra bedroom, garage or basement, or built as an addition, or they can be completely detached if there is enough space on the lot. Secondary units have the potential to yield multiple benefits for residents and communities:

  • New, more affordable homes for smaller households within the fabric of existing neighborhoods
  • Flexible living spaces that meet the needs of families that are branching, blending and aging
  • Supplemental income for homeowners seeking financial stability
  • Housing solutions for specific populations, including formerly homeless, seniors, home healthcare workers, developmentally disabled adults, and teachers
  • Reduced traffic congestion resulting from increased housing supply near public transit
  • Local construction jobs and training opportunities

Interested?

Hello Housing is working with a diverse set of partners to help more homeowners successfully build secondary units. Whether you are a homeowner, architect, contractor (or just a fan!) please subscribe to receive updates about exciting new resources we are developing.

HELLO HOUSING IS A
PROUD AFFILIATE OF

Matt Franklin, CEO of MidPen Housing and President of Hello Housing, believes everyone deserves quality, affordable housing.

Michelle is a proud new homeowner who purchased a Hello Housing NSP home in San Lorenzo.

Board Member Rick Jacobus is a national expert using data, not anecdote, to design more impactful affordable homeownership programs.

Mardie Oakes, Executive Director, blends finance, design and development to make places people thrive.

Jennifer Duffy, Director of Business Development, turns opportunity into action with the Hello Housing team.

Apple lives in a new type of housing made possible by Senate Bill 962, sponsored by former Senate pro Tem Darrell Steinberg.

Larry shares a duplex with two housemates in an innovative residential program called the Family Teaching Model.

Tien is a proud new owner of an affordable home in Newark, as well a box full of tools to make home repairs easy.

Matt Warner, Program Director for Hello Stewardship, makes affordable homeownership happen.