Three paths to a new ADU.
One process. One standard.

Pros

• Fastest permit path — pre-engineered plans clear plan check in weeks, not months
• Transparent pricing in writing — no change orders for scope we should have anticipated
• Build it yourself, bring your own licensed contractor, or use a vetted construction partner
• Design, engineering, and permitting from CALI ADU; construction by an independent licensed general contractor under separate contract
• 324 interior combinations × 48 exterior styles — every option included in your plan fee

Cons

• Floor plans can be modified slightly for an added fee — significant layout changes convert the project to a custom build
• Pre-engineered for typical LA lots — unusual lot shapes or significant slopes may require a custom design

Best for

Homeowners building new on a typical LA lot who want a fixed plan price and the fastest permit path.

Pros

• Lowest construction cost in the lineup — you save the cost of foundation, framing, and roof
• Fastest construction phase — existing structure means weeks, not months, of framing
• Preserves your backyard — the ADU starts in the garage footprint, with optional additions
• Often qualifies for lower city fees and faster ministerial review

Cons

• You lose covered parking — California does not require replacement parking, but some buyers value it
• Starting size matches your existing garage footprint — additions are available for an added cost
• May require structural upgrades if the existing garage was not built to current code

Best for

Homeowners with a usable attached or detached garage who want the fastest, lowest-cost path to a backyard rental or guest suite.

Pros

• Designed specifically for your lot — every constraint is a design opportunity
• Architectural freedom — rooftop decks, custom roof lines, integrated garages, anything within code
• A transparent construction estimate from the licensed general contractor once design is finalized
• Your licensed general contractor sets the construction schedule in your contract

Cons

• Longer design phase — typically 12 to 20 weeks before permitting starts
• Higher total project cost — custom design and engineering carry a premium
• Pricing not fixed until design is complete — Signature plans give you the price on day one

Best for

Tight or unusual lots, multigenerational layouts that need a custom configuration, rooftop decks, attached garages, or any project that needs a building the Signature lineup cannot deliver.