ADU construction and garage conversions in Los Angeles
An accessory dwelling unit can provide separate living space, but the build must work for the lot, existing structures, and utility connections. Sierra Development welcomes inquiries for detached ADU construction and garage conversions across Los Angeles, Santa Clarita, Castaic, the San Fernando Valley, and the San Gabriel Valley. We start with the property address, intended use, and available plans rather than assuming every garage or backyard is ready for conversion.
Detached construction and conversion are different scopes
A new detached ADU brings site preparation, foundation work, framing, roofing, building systems, and interior finishes into a compact building footprint. A garage conversion starts with an existing structure that may need changes to its foundation, floor, walls, roof, openings, or services. The condition of the building and the proposed layout guide the discussion.
Both approaches require attention to privacy, access, kitchen and bathroom placement, storage, exterior finishes, and the relationship to the main home. Tell us whether you are planning housing for family, flexible guest space, or another permitted residential use. We do not promise rental income, approval, or a fixed completion date before reviewing the project.
Resolve utilities and access early
Identify the location of water, sewer, electrical equipment, and other services before the construction scope is priced. A route that appears short on a drawing may be affected by existing paving, landscaping, elevation changes, or access restrictions. Discuss any planned electrical capacity changes and how the construction area will be reached without unnecessarily disrupting the main residence.
If you already have plans, include the site plan, floor plan, structural details, and permit status. If you do not, the initial discussion can identify the information needed for construction review. Design and jurisdictional approvals remain property-specific.
Use the right permitting reference
The City of Los Angeles ADU guidance describes its ADU and standard-plan programs. That guidance applies to the city and is not a substitute for checking the authority serving a property elsewhere. A pre-approved design still needs review for site-specific conditions. Ask Manuel about the construction work after identifying the applicable permitting path.
Related construction scopes
Where we discuss projects
Questions before you build
Does Sierra Development discuss adus & garage conversions in the surrounding valleys?
Yes. Sierra Development serves Los Angeles, Santa Clarita, Castaic, the entire San Fernando Valley, and the San Gabriel Valley. Send the property location and scope to Manuel Carrillo for project review.
What should I provide for a adus & garage conversions inquiry?
Send the project address or neighborhood, current photographs, available drawings, intended work, and known access or occupancy constraints. Identify design and permit information still pending. A price or schedule depends on reviewing the actual scope.
Page updated October 6, 2026. Project scope, cost, approvals, and timing require review of the actual property.