Buildable location
Study property boundaries, existing buildings, easements, trees and any slope or drainage concerns. A survey may be needed to resolve uncertainty.
ADU path · detached
Detached ADU construction, from site work to handover.
A new backyard dwelling means more than placing a floor plan. KB Remodeling discusses construction access, site preparation, utilities, structure and the required review path with the homeowner before treating a detached ADU scope as ready to build.
Discuss a detached ADU
01
Test the site before choosing a plan
Start with what is physically present, then confirm the applicable standards with the reviewing agency.
Access and staging
Measure the path for materials and equipment. A narrow side yard or occupied main house changes the construction plan.
Utilities
Investigate water, sewer and electrical capacity and routing. Connection work may extend beyond the ADU footprint.
Living arrangement
Position doors, windows and outdoor space for privacy, daylight and a practical route from street to unit.
02
What to resolve early
Agency and conditions
Identify whether a city or the county reviews the parcel and ask about any special site overlays before assuming a standard path.
Site work extent
Include grading, drainage, trenching and protection of the existing home when studying the concept.
From site to unit
- 01
Collect records
Gather survey, previous permits and utility information.
- 02
Test the concept
Coordinate siting, access and preliminary service routes with the intended use.
- 03
Design, submit, respond
Develop documents with appropriate specialists and address agency comments.
- 04
Build and inspect
Sequence ground work, utilities, structure and required inspections before closeout.
Detached ADU decision checklist
- Where is the true property boundary?
- What route can builders use without blocking the main home?
- Which trees, easements or grades need review?
- Where would utility trenches run?
- How should the two homes share outdoor space?
A useful early brief
- Potential siting options
- Access and staging assumptions
- Utility questions for providers
- Site investigations still needed
- Approval path to verify
Planning resources for your ADU
Start with California guidance and the building department responsible for your property. Requirements depend on the site and jurisdiction.
Detached ADU questions
What should be checked first for a detached ADU?
Where it can sit relative to property lines and the main house, how materials and equipment reach the backyard, and how water, sewer, power and gas will be routed to the new structure.
Which reviews apply to a detached ADU?
Typically zoning review of placement and size, building plan check, and review by utilities or fire departments where connections or access are affected. Your reviewing city or county confirms the exact steps.
What makes a detached ADU take longer to build?
Foundation work, trenching for new utility lines, limited access that requires smaller equipment or hand work, inspections at each stage, and late selection of windows, cabinets or fixtures.
Can a detached ADU be placed anywhere in the yard?
No general placement answer substitutes for a property review. Boundaries, site features, applicable state and local standards and special conditions must be checked.
Does a separate building need separate utilities?
Utility arrangement varies by property and provider. Capacity, connections and metering should be confirmed as part of feasibility.
Compare other paths
Prepare your project brief
Keep the property questions, priorities and your own figures together before reaching out.
Open the planning studio ↗KB Remodeling · Greater Los Angeles