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Accessory dwelling units

Thinking about an ADU? Start with what your property allows.

Share a few details to check available ADU options for your property.

Check ADU availability

Step 1 of 4
Sample site plan

How a backyard unit can sit on a lot

Sample overhead site plan showing a main home, backyard unit, garden and access paths

Sample layout for discussion only. Placement, size and approval depend on your lot and local rules.

Phases of an ADU project

A typical sequence homeowners move through. Requirements vary by market, and nothing here is a promise of approval.

  1. Phase 1

    Feasibility

    Lot size, setbacks, utilities and local rules.

  2. Phase 2

    Concept

    Size, layout and how the unit will be used.

  3. Phase 3

    Design & permits

    Drawings and the local review process.

  4. Phase 4

    Build

    Construction once plans are in place.

Information to have ready

  • 1Your property address and approximate lot size
  • 2Where on the lot you picture the ADU
  • 3Location of existing utilities, if known
  • 4How you plan to use the space
  • 5Any HOA restrictions
A modern backyard accessory dwelling unit at dusk

How the ADU review works

01 /

Use and lot

You tell us how you'd use the ADU and what's on the property today.

02 /

ZIP check

We see which ADU options may be available where the property is.

03 /

Feasibility conversation

If options exist, you discuss what your lot and local rules may allow.

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Reading a lot for an ADU

Before design, it helps to understand the ground the unit would sit on. Rules vary by city and change over time.

  1. 1

    Setbacks

    Required distances from property lines and the main house.

  2. 2

    Access

    How people, materials and utilities would reach the unit.

  3. 3

    Utilities

    Where water, sewer and power lines run and could connect.

  4. 4

    Slope & trees

    Grade changes and existing trees affect placement.

What the space might be for

How the unit will be used shapes its layout far more than its size alone.

Family living

Room for a parent, adult child or relative nearby but separate.

Home office or studio

A quiet workspace away from the main house.

Guest space

A place for visitors with its own entry.

Rental

Long-term rental, subject to local rules and requirements.

Types of ADU to ask about

Which forms are allowed depends on local rules and the property itself.

  • Detached

    A separate structure in the yard.

  • Attached

    An addition connected to the main house.

  • Garage conversion

    Reworking an existing garage into living space.

  • Interior conversion

    Converting a basement or part of the house.

Permits and approvals are decided by local authorities. Nothing here guarantees that an ADU is allowed on a given property.

Detached backyard cottage with wood siding, glass doors and a small deck

Design follows the lot

Window placement, deck size and the path from the main house all shape how a unit feels day to day.

Before the call

Questions commonly covered

Helpful to think about ahead of time. None of it is required to get started.

  • 01Approximate lot size and where open space sits
  • 02Side or alley access for construction and daily use
  • 03Location of existing water, sewer and electrical lines
  • 04Local rules you've already looked into — to be confirmed with your city
Questions

ADU questions

Explore what your lot could hold.

A few details are enough to start the conversation.