ROSEMEAD, Los Angeles County — October 23, 2026. Homeowners hoping to add a second dwelling can begin with Rosemead’s Accessory Dwelling Units and Standard Plans Program. The city publishes example detached ADU designs sized 800, 1,000 and 1,200 square feet, with two- and three-bedroom options. The city identifies the design professional responsible for the preapproved plans, and says homeowners purchase drawings directly from that professional rather than treating a municipal preview as a construction license.
Are the published drawings enough to build?
No. Rosemead’s ADU information distinguishes preapproval of a general design from permission to place the unit on a specific parcel. The city states that an administrative site-plan and design review goes to Planning before the Building Division’s permit process. A property can have easements, utility service constraints, setbacks, existing structures and access considerations that require site-specific drawings or other approvals.
Do all models have the same floor plan?
Not necessarily. The city lists several renderings for available designs, including multiple examples sharing the same floor area. Compare the actual bedrooms, bathrooms, licensed plans, exterior design and applicable code documents before paying. A preapproved plan can help streamline review, but the owner is still responsible for completing the municipal application and verifying that the plan remains current under building standards effective in 2026.
Check the true project cost
The drawings do not pay for construction, foundation work, grading, water or sewer service, electrical upgrades, fees, inspections, solar where required, or any other parcel-specific design work. Request written estimates listing every part of the job. California state ADU rules and the city ordinance may interact; for an individual lot, ask the city to identify the operative requirements rather than relying on a contractor’s marketing summary.
How to get official guidance
Rosemead’s Planning Division can answer questions at 626-569-2140. The city’s program page links the current ADU guidance and municipal code. Check the current designer’s contact details directly on the official city page before sending money or personal information. This newspaper does not act as an agent for plan providers.
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Primary source: City of Rosemead Accessory Dwelling Units and Standard Plans Program. Municipal review, plan availability and pricing must be confirmed with city officials and designers.
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