ADU service lane
Attached ADU planning at the boundary of old and new work
An attached ADU proposal connects new residential space to an existing home. That connection makes the condition of the current building, the proposed interface, and the building systems part of the same review context.
Orientation
The interface with the existing home is the central review object
A responsible scope distinguishes the desired addition from the evidence available about the existing structure. Connections, openings, circulation, utilities, envelope continuity, and occupancy questions cannot be resolved from a generic page.
The controlled workflow makes each dependency visible, assigns its review owner, and prevents an attractive concept from being mistaken for an approved or construction-ready scope.
Scope anatomy
What the attached lane organizes
Existing-building context
Available records and current-condition evidence are associated with the part of the building they describe.
Connection strategy
Proposed structural, circulation, envelope, and system connections remain explicit review questions.
Use separation
Privacy, access, shared conditions, and operational preferences are framed without asserting a code outcome.
Approval dependencies
Each decision shows the official or professional evidence it depends on before OwnerReview.
Evidence needs
Evidence categories for an attached workstream
Nothing is collected here. These categories show how a future authorized review would prevent gaps at the existing-to-new interface.
- Official records available for the existing residence
- Current-condition documentation for affected building areas
- Proposed relationship between existing and new spaces
- Discipline review for connections and building systems
- OwnerReview decision with unresolved dependencies preserved
Decision path
A bounded path from intent to owner-reviewed action
Define the interface
Describe where proposed work meets the existing home and list the evidence needed there.
Coordinate disciplines
Keep structural, envelope, system, and use questions connected to one review record.
Gate the next action
Allow only the next bounded, owner-reviewed step to move forward in a future workflow.
Frequently asked questions
Clear answers without instant conclusions
Does an attached ADU follow the same path as a detached ADU?
Not necessarily. Existing-building conditions and the proposed connection can change the review questions. Requires official source verification.
What is the main early coordination issue?
The interface between existing and proposed work: structure, circulation, envelope, systems, evidence, and approval dependencies need to stay connected.
Does this page determine whether an addition is allowed?
No. It provides general workflow education only. Requires official source verification.
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