What We Build
There are a few common ways to add an ADU. This page explains the options in plain English so you can understand what fits your property and your goals.
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Quick overview
Quick overview
An ADU is a small second home on your property (sometimes called a backyard cottage or in‑law unit).
Most projects fall into one of the three options below. The best choice depends on your lot, your budget, and how you plan to use the space.
Prefer to talk? Call: (425) 610-9040
Detached ADU (separate building)
Detached ADU (separate building)
This is a separate small home in the yard. It offers the most privacy and often works well for a rental or family who wants their own space.
Best for: rental income, privacy, multigenerational living
Common benefits: quieter, more separation from the main house
Things to plan for: site work, access to the backyard, utilities, and permit requirements
A detached ADU is not always the cheapest option, but it is often the most flexible.
Attached ADU (connected to the main house)
Attached ADU (connected to the main house)
This is an ADU that connects to the main home. Sometimes it’s simpler for utilities and access, and it can be a good fit on tighter lots.
Best for: family living nearby, aging parents, extra living space
Common benefits: easier access, sometimes less yard disruption
Things to plan for: how it ties into the existing home, privacy, sound, and how utilities are routed
Attached ADUs can be a smart option, but they require careful planning where the new and existing parts meet.
Garage conversion (if the garage is a good candidate)
Garage conversion (if the garage is a good candidate)
This turns an existing garage into living space. It can be a good option when the structure is in good shape and the layout makes sense.
Best for: adding space with less exterior work
Common benefits: may reduce some framing and exterior work
Things to plan for: insulation, heat, ventilation, electrical upgrades, plumbing, and whether the floor/foundation is suitable
A garage conversion is not always “cheap and easy.” Some garages need significant upgrades to meet code for living space.
How we choose the right option
How we choose the right option
Here are the questions that usually decide which ADU option makes the most sense:
Do you want privacy (rental) or close access (family)?
How much yard space do you want to keep?
How easy is backyard access for construction?
Are utilities close to where the ADU would go?
Are you trying to move quickly, or are you flexible on timing?
What’s your realistic budget range?
A feasibility review is the fastest way to narrow this down based on your actual lot.
What happens next
What happens next
If you request a feasibility review, I’ll look at your property and ask a few questions about what you want to do.
Then I’ll tell you which option is most realistic and what the next step should be.
This is not a final bid. It’s a practical first step so you don’t waste time or money.
Want a straight answer on what your lot can support?
Want a straight answer on what your lot can support?
Start with a feasibility review. I’ll help you understand what’s realistic and what to expect.
Prefer to talk? Call: (425) 610-9040
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