What Is a Granny Flat? A Beginner’s Guide to This Smart Home Addition

If you’ve never heard of a granny flat, you’re not alone—but this clever housing option is becoming increasingly popular among homeowners looking to make the most of their property. Whether you’re planning for aging parents, want to create more flexible living space, or are thinking about your family’s future needs, a granny flat might be the perfect solution.

So, What Exactly Is a Granny Flat?

A granny flat is a small, self-contained living space located on the same property as a single-family home. It has its own entrance, kitchen or kitchenette, bathroom, and living area. The name comes from its original purpose: to house elderly parents (like grandma or grandpa) while keeping them close, but still giving them privacy and independence. You might also hear the term in-law unit, backyard cottage, or guest house—all of which can refer to similar types of spaces. However, the term granny flat specifically emphasizes care for aging loved ones.

What Does a Granny Flat Look Like?

Granny flats can take several forms:

• Detached: A separate building in the backyard, like a small cottage or tiny home.

• Attached: Built as an extension to the main house with a private entrance.

• Garage Conversion: A transformed garage turned into a livable space.

• Basement Apartment: A finished basement outfitted as its own unit.

Most granny flats are designed to be compact—usually between 300 and 1,200 square feet—and often include features to make aging easier, such as:

• One-story layout

• Walk-in showers

• No-step entries

• Wider doorways

• Grab bars or other safety supports

Why Build a Granny Flat?

Granny flats offer a variety of benefits:

• Keep Family Close: Ideal for aging parents who need occasional help but still value their independence.

• Multigenerational Living: Provides space for adult children, returning college students, or extended family.

• Flexible Use: Can serve as a guest house, home office, hobby space, or even short-term rental (depending on local laws).

• Increase Property Value: Adding a livable second unit can boost your home’s resale appeal and functionality.

Are Granny Flats Legal?

That depends on your location. Many cities, especially in states like California, now allow homeowners to build secondary units under updated zoning laws. These are usually classified as Accessory Dwelling Units (ADUs), which is the technical, legal term for a granny flat.

Before starting construction, it’s important to:

• Check local zoning regulations

• Apply for the appropriate permits

• Work with experienced professionals who understand the code requirements

Is a Granny Flat Right for You?

A granny flat might be a great fit if:

• You have aging relatives who want to live nearby but independently

• You’re looking to create a multi-generational household

• You want to increase the versatility and value of your property

As our families grow and needs change, having a flexible, functional space like a granny flat can be a smart investment—both financially and emotionally.

Granny flats are more than just an extra room—they’re about bringing people together while preserving independence and comfort. Whether you’re planning for a loved one, seeking more space, or just curious about future possibilities, exploring the idea of a granny flat is a great first step.

Need help getting started? Contact our team for expert advice on planning, designing, and building a granny flat that fits your family’s needs and your property’s potential.