ADU Builder in Pasadena, CA

The City of Pasadena updated its regulations for accessory dwelling units and junior accessory dwelling units effective May 20, 2024, under Ordinance No. 7420. The city publishes the current rules on its own ADU page, and that document — not the pre-2024 handouts still circulating — is what a submittal has to answer to.

For a Pasadena lot the practical difference is usually not the size of the unit. It is the parking count, whether the property sits inside a historic district, and whether the impact-fee threshold is crossed. All three turn on details of your address and existing structure, which is why a feasibility review comes before any drawing is commissioned.

Scope boundary: parking, setbacks and fee thresholds below are quoted from the City of Pasadena’s published ADU regulations. They change by ordinance cycle — confirm the current text with the Planning & Community Development Department before you approve a construction budget.

The city’s rule is one parking space per unit or per bedroom, whichever is less, and the space may be covered, uncovered, or provided as tandem parking on an existing driveway. That matters on older Pasadena lots where a second paved area would mean removing mature planting or shrinking the yard.

The ordinance then removes the requirement entirely in three situations:

Two more points decide most garage-conversion conversations. First, replacement parking is not required when an existing garage, carport or surface space that served as the required parking for the primary dwelling is demolished or converted in conjunction with the ADU work — so converting the garage does not automatically cost you a space. Second, Pasadena is served by the Metro A Line, with stations including Sierra Madre Villa and Memorial Park; whether your address falls inside the one-half mile walking distance is an address-level question, and it is worth checking before you design around a parking pad.

Pasadena’s City Council has designated over 200 individual historic sites and 26 historic neighborhoods. If your home is one of them, an ADU or an exterior change is reviewed differently: the city states that an accessory dwelling unit is permitted if not visible from the public right-of-way, and its Historic Preservation Commission reviews Certificates of Appropriateness for alterations and additions within a historic site or district. The Planning Division applies The Secretary of the Interior’s Standards for Rehabilitation as the review standard.

That changes the sequence, not just the paperwork. Siting, materials and sightlines have to be resolved before the commission review, so we schedule the historic-district check in the feasibility stage rather than after drawings are done — and we coordinate the certificate application with the licensed design professional preparing your plans.

Not sure where your property stands? The city publishes its historic places inventory, and the address-level answer decides which path your ADU takes. how we handle older homes with several generations of alterations →

Two of those rows are why we size the conversation early. A plan that lands at 905 square feet rather than 895 crosses the Residential Impact Fee line for eleven square feet, and a JADU that steps outside the existing building envelope stops being a JADU. Both are decided on paper, cheaply, before any structural work is quoted.

The city runs an ADU Standard Plans program offering several pre-approved plans, from studios to two-bedroom units, all of them pre-approved by Building and Safety. For the right lot this is the fastest route in the San Gabriel Valley: the design question is already answered.

The constraint is stated on the same page: modifications to the pre-approved plans are not allowed, regardless of how minor the changes are. So a standard plan fits when the published footprint genuinely works for your yard, your access and the household the unit is for. It is the wrong tool when the goal is multigenerational living, an accessible layout, or a unit that has to clear a historic-district sightline.

We look at both routes — standard plan or a design prepared for your property by a licensed design professional — before recommending either, because the difference shows up in how the unit is used for the next twenty years, not in the permit counter.

Your written agreement identifies the responsible contractor, project scope and coordination with licensed design professionals.

California law requires a city to approve or deny a complete ADU application within 60 days; correction cycles vary by jurisdiction, and Pasadena’s own cycle depends on whether the property carries a historic designation.

Separately from the permitting route, the city’s Department of Housing publishes a Second Unit ADU Program for homeowners adding a unit, including a city-backed construction loan option and an alternative in which the completed unit is rented to a Pasadena Housing Choice Voucher tenant. Terms are set by the department and change between program cycles, so we treat it as a question to confirm with the city rather than a number to quote — and we note in your scope which parts of the project a program like this can and cannot cover.

Related reading: how owners across California fund an ADU →