Some of the most meaningful decisions homeowners make have nothing to do with buying or selling. They have to do with making the most of their current home.

 

Maybe you have an aging parent who needs to be closer but values their independence. Maybe you have an adult child who just graduated and is staring down rent prices that feel impossible. Maybe you've been thinking about generating some extra income from your property without buying something new.

 

Whatever the situation, there's a solution a lot of homeowners don't know about until someone mentions it: an accessory dwelling unit, also known as an ADU.

 

What Is an ADU? 

 

In plain terms, it's a self-contained living space on the same property as your primary home. It has its own entrance, kitchen, bathroom, and sleeping area. Think of it as a small apartment that shares your lot but feels completely separate.

 

You've probably heard other names for them: granny flat, in-law suite, backyard cottage, garage apartment. They're all variations of the same idea.

 

How Can an ADU Actually Help?

 

This is really the heart of it. ADUs solve real problems that a lot of families are quietly dealing with.

 

Keeping a parent close without giving up anyone's independence. Moving a parent into a care facility is expensive and often not what anyone actually wants. An ADU lets you have family nearby while everyone still has their own space, their own front door, and their own routine. For a lot of families, this is the option that feels most like the right answer once they realize it exists.

 

Giving an adult child a real start without derailing your household. The cost of rent is a stumbling block for many people right now, especially for someone just getting started. An ADU gives a young adult their own space and privacy while keeping costs manageable. It's a way to help without absorbing them back into the main house, which tends to work better for everyone.

 

Generating rental income. If neither of those situations applies right now, a well-located ADU can generate meaningful monthly income. In markets with strong rental demand, that income can make a real dent in your mortgage payment.

 

Creating a dedicated space for work or guests. Not every ADU needs to be a full-time residence. Some homeowners use them as a home office, a studio, or a comfortable guest space that doesn't take over the main house when visitors come.

 

What Are the Different Types?

 

ADUs come in several forms depending on your property and budget:

 

• Detached ADU: A separate structure on your property, like a backyard cottage or an apartment above a detached garage.

• Attached ADU: Built onto your existing home with its own separate entrance.

• Garage conversion: Your existing garage becomes a livable space. Often one of the more affordable options since the structure is already there.

• Interior conversion: A basement or attic gets converted into a self-contained unit with its own entrance.

 

What Does It Cost to Build One?

 

ADU costs vary quite a bit depending on your location, the type you build, and the finishes you choose. As a general rule, converting existing space in your home, like a garage or basement, tends to be the most affordable path since the structure is already there. Building an attached addition typically costs more than a conversion. A fully detached new structure is generally the most expensive option since you're building from the ground up.

 

Local permitting rules also vary significantly. Some cities have made the process much easier in recent years and actively encourage ADUs. Others have more restrictions. It's worth checking what's allowed in your area before you get too far into planning.

 

How Do You Pay for One?

 

This is where your home's existing equity comes in. If you've owned your home for a few years, there's a good chance you've built up meaningful equity, and that equity can fund an ADU without draining your savings.

 

A few options worth knowing about for qualified borrowers:

 

HELOC (Home Equity Line of Credit): You borrow against your equity and draw funds as you need them, paying interest only on what you use. Works well for a project where costs unfold over time.

 

Cash-out refinance: You replace your existing mortgage with a new, larger one and take the difference in cash.* Can make sense if current rates are close to what you already have.

 

Home equity loan (second lien): A lump sum at a fixed rate, separate from your existing mortgage. Good if you know your total costs upfront and want predictable payments.

 

The right fit depends on your current rate, how much equity you have, and how you want to structure things. A quick conversation can help you figure out which path makes the most sense.

 

Is This Worth Exploring for Your Home?

 

The first step is simply knowing what your home is worth today and how much equity you have to work with. That number tells you what's realistic before you start talking to contractors or architects.

 

Curious where you stand? Fill out the form below and we can start planning. 
 

*By refinancing your existing loan, your total finance charges may be higher over the life of the loan.