Pasadena ADU Builder

Building an ADU in Pasadena, CA

The city’s standard-plan shortcut expired at the end of 2025 — here is what actually works in Pasadena now.

Pasadena ADU key facts

Who reviews your plans	Pasadena’s own Planning & Building departments — independent of LADBS
The 2026 reality	The city’s ADU Standard Plans EXPIRED Dec 31, 2025 (building-code update); currently limited to Eaton Fire red-tagged properties while new plans are prepared
What that means	Custom design is the practical path for most Pasadena homeowners right now
Watch for	Historic districts and landmark properties carry extra design review

Pasadena ran one of the region’s better standard-plan programs — free, city-designed ADU plans that skipped most of plan check. Then the California building codes updated, and per the city’s own planning page, those plans expired on December 31, 2025. As of 2026 they are available only for properties red-tagged by the Eaton Fire, with new citywide plans promised in the coming months. Most articles you will find online still describe the old program. The practical 2026 answer: custom design, done by a team that knows Pasadena’s review culture.

What’s different about building in Pasadena

Start with the standard-plans situation, because it changes the math. Until the city publishes its updated catalog, a homeowner cannot simply pick a free pre-approved design off the shelf — the current plans are reserved for Eaton Fire rebuilds. That removes the shortcut but not the opportunity: a custom ADU through Pasadena’s normal ministerial process remains fully available, and state law’s approval clocks apply here like everywhere else.

Second, know your district. Pasadena takes its architectural heritage seriously; properties in historic districts or with landmark status carry design review that a standard lot does not. This is a lookup we run in the first conversation — it changes the design brief, not the feasibility.

Third, the Eaton Fire context is real. For affected families, an ADU can be part of a rebuild strategy — housing on the lot while the main house is reconstructed, or a permanent second unit. The red-tagged-property exception to the standard-plans expiry exists exactly for this, and we can walk through whether it applies to your parcel.

What an ADU costs in Pasadena

The short answer

Published ranges apply: garage conversions typically $90,000–$150,000, detached units $200,000–$450,000+ — with historic-district design work adding scope where it applies. Details in the cost guide and the LA hub.

Frequently asked questions

Can I still use Pasadena’s free pre-approved ADU plans?

For most properties, not right now. Per the city’s planning page, the Standard Plans expired December 31, 2025 due to California building-code updates, and as of 2026 they are limited to residential properties red-tagged by the Eaton Fire. The city says updated citywide plans are coming; until then, custom design is the practical route.

Does Pasadena use LADBS?

No — Pasadena runs its own Planning and Building & Safety departments. Your submittal is reviewed in Pasadena, by Pasadena.

My house is in a historic district — can I still build an ADU?

Usually yes, with additional design review. The district shapes what the unit should look like, not whether you can build. We check your property’s status before design starts.

Can an ADU help with an Eaton Fire rebuild?

It can — both as interim housing on the lot and as a permanent unit, and red-tagged properties currently retain access to the city’s standard plans. We can review what applies to your specific parcel.

Useful links for Pasadena homeowners

City of Pasadena — official ADU page Orange County ADU cost guide OC permit requirements Garage conversion ADU guide All areas we serve

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