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Calabasas / ADU construction

ADU construction in Calabasas

Calabasas publishes ADU guidance through its Building and Safety Division. On larger or sloped lots, the deciding questions are usually where a unit can be reached, how utilities get there, and whether an existing garage is worth converting.

01

What shapes this work here

The City's ADU page first

Read the Calabasas ADU page for local resources; state summaries are background, not the local rulebook.

Detached vs garage conversion

A detached unit needs a buildable, reachable pad; a conversion depends on the garage's slab, walls and roof. Site evaluation decides which is practical.

Grading and drainage

Where a pad must be cut or filled, drainage and engineering become part of the scope. Know this before choosing a location.

02

First steps in this city

  1. 01

    Read the City's ADU guidance

    Note unit types and listed resources.

  2. 02

    Check association rules

    Ask whether an HOA reviews accessory structures.

  3. 03

    Walk the access route

    From street to pad, including slopes and gates.

  4. 04

    Locate utilities

    Electric panel, water, sewer or septic, and gas.

03

What the scope usually covers

  • Site evaluation comparing a new detached unit with converting an existing garage or accessory structure
  • Foundation: new footing design, or assessment of an existing slab and shell
  • Utility routes from the main service to the unit
  • Build-out, final inspections and handover documents
  • Drainage and grading coordination where the unit pad is not level
04

Bring to the first conversation

  • Property address
  • Site sketch with structures, trees, slopes and utility locations
  • Intended use of the unit
  • Photos of the garage interior and slab if converting
  • Photos of the proposed location showing the slope
05

Questions homeowners ask

Will Calabasas approve an ADU on my lot?
Only the City can decide that for your parcel. We prepare the information it reviews; we don't predict the outcome.
Is my property on septic a problem?
It changes the utility question, not necessarily the answer. The capacity and location of the system must be evaluated.

Official references

These references explain where to look; they do not confirm what applies to a specific parcel.

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