Number of ADUs Allowed in La Cañada Flintridge
- Maximum size: 1,200 sq ft (detached or attached, or 50% of the size of the main dwelling)
- Side/rear setbacks: 4 feet
- Two story: Yes, for both attached and detached ADUs
- Building separation: 6 feet
- Soils Report: Possibly, especially in areas with grading or on hillsides
- Building Verification Survey: Yes
- Coastal permit (in some areas): N/A
- Stormwater Mitigation: Yes
Number of ADUs Allowed in La Cañada Flintridge
You are allowed to put one attached or detached ADU on single-family property in La Cañada Flintridge, as well as one JADU.
Multifamily property owners in La Cañada Flintridge may convert existing uninhabitable space into at least one attached ADU, and additional ADUs not to exceed a maximum number equal to 25% of the existing units. Ergo:
- From 2 to 7 units, you could convert existing uninhabitable space into one ADU
- From 8 to 11 units up to 2 ADUs
- From 12 to 15 units up to 3 ADUs
- And so on.
No more than two detached ADUs may be constructed on a multifamily lot in La Cañada Flintridge.
ADU La Cañada Flintridge – Size & Building Constraints
An detached ADU can be up to 1,200 square feet in La Cañada Flintridge.
An attached ADU in La Cañada Flintridge can be up to 1,000 square feet, or 50% of the square footage of the primary dwelling unit, whichever is smaller.
In La Cañada Flintridge, an attached ADU must adhere to local zoning regulations or have a maximum height of 25 feet, whichever is smaller. Detached ADUs are limited to 16 feet of height on single-family lots, 18 feet of height on multifamily lots.
2-story ADUs are allowed in La Cañada Flintridge, especially for attached ADUs which can be taller — up to 25 feet, plenty of space for a second story. Third stories are not allowed. For detached ADUs, the height restrictions of 16-18 feet will make it very difficult to build a 2-story ADU. In general, detached ADUs will be limited to one story.
Generally speaking, in La Cañada Flintridge detached ADUs cannot be stacked one on top of another, with one ADU on each story. Only one detached ADU is allowed on single-family property, and even on multifamily property height restrictions would prohibiti such a design.
La Cañada Flintridge rules do not specify whether two detached ADUs can be attached together within one structure, nor does California state law. Keep in mind that only multifamily property is allowed to have two detached ADUs on one property; single-family property is limited to one detached ADU. Plansmightget approved on multifamily property for two ADUs in one detached structure, but other ordinances for landscaping, setbacks, and separation. In practice, it is rare.
No, a JADU is defined as an ADU converted from existing space within the main structure of the primary dwelling unit. As such, it cannot be attached to an ADU.
Generally roof decks would be permitted on an ADU, but must meet the height restrictions for the zone. Roof decks cannot encroach into the required setbacks. As a rule of thumb, railings and access staircases above 42″ need to be included in height calculations.
An ADU must match or harmonize with the exterior of the main dwelling unit, including color palette, roof pitch, architectural style, and other aesthetic characteristics.
ADU Setbacks in La Cañada Flintridge
ADUs behind the primary dwelling unit in La Cañada Flintridge require a minimum of 4-foot side and rear setbacks.
The ADU must maintain sufficient distance from other structures on the property to comply with fire regulations — usually at least 4 or as much as 6 feet of separation between buildings.
City regulations do not explicitly prohibit an ADU in the front yard, but in practice it is very difficult, since the ADU must comply with front and side setback, building, landscaping, and aesthetic requirements.
ADU Setbacks in La Cañada Flintridge
No, you can submit plans to the Planning Division via the city’s online resident services portal,ConnectLCF.
La Cañada Flintridge may require a soils report for ADU permitting to make sure the soil can support the new structure, especially if the ADU will be located on a hillside, an area with significant grading, or if there are special foundation requirements.
Specific requirements are not mentioned in the building code, but the building plans must allow for sufficient green space and permeable landscaping surface.
The plan check requires a review by the Building and Safety Division for zoning, building standards, and safety compliance. The city aims to review the plans within 60 days, though that may vary based on how busy the department is.
Parking for La Cañada Flintridge ADU
One new parking spot is typically required to be added to the lot per new ADU. However, exemptions may apply if:
- The ADU was built into an existing structure.
- You are applying to build a new primary dwelling unit at the same time.
- The property is located within a historic district.
- The property is located within ½ mile walking distance of a public transportation stop.
- The property is located within one block of an established vehicle share stop.
- Off-street parking permits are required but not offered to ADU occupants.
If a parking space must be added, it can be included on the driveway or any setback areas, and it may be configured as tandem parking.
Additional Requirements in La Cañada Flintridge
Per Title 24 of the California Energy Code, solar panels of appropriate size and capacity are mandatory on new-construction ADUs. ADUs built from converted existing structures are exempt, as may be ADUs located under significant shading. Smaller ADUs may be subject to reduced or modified solar panel requirements.
An ADU is not required to have a separate water or electrical meter. You can opt for the ADU to share service with the main dwelling unit. However, you can request separate water or electrical meters from the City of La Cañada Flintridge.
La Cañada Flintridge does not automatically assign a new ADU its own address. However, it may assign the ADU a new address if it is intended for rental or independent occupancy. The ADU will usually get a “lettered” unit designation — for example, an ADU located behind 1234 Pine Street would have the address “1234A Pine Street.
Low Impact Development (LID) is an approach to land development or redevelopment that seeks to preserve and conserve onsite water quality and natural features, with minimal detrimental effect to local waterways and ecosystems. The City of La Cañada Flintridge may require LID fees for larger ADUs.
An ADU may not be used as an Airbnb or short-term rental in La Cañada Flintridge. Rental periods must be 30 days or longer.
Per the Costa-Hawkins Act of 1995, La Cañada Flintridge does not impose rent control on dwellings constructed after February 1, 1995. This means most new-build ADUs are exempt. However, if the primary dwelling unit is subject to rent control, it might apply to the ADU as well.
While encouraging the use of electric appliances for efficiency and sustainability, La Cañada Flintridge does not prohibit gas appliances in new ADUs as long as all relevant installation and safety standards are met.
In La Cañada Flintridge you are only required to install sprinklers in a new ADU if the primary dwelling unit has them as well. You may also be required to install them if the ADU is located within a special fire hazard zone.
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