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If you are looking for an adu contractor in Paramount, understanding how state law and local permit realities interact is one of the first things we walk through with you. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and the rules shifted again on January 1, 2026. Square footage is now measured as interior livable space rather than overall building area, and that distinction matters when you are working with a compact postwar lot where every foot counts.

On the permitting side, the City of Paramount Building and Safety and Planning department handles building permits, inspections, and zoning for any ADU project here. State law sets the clock: an agency has 15 business days to determine whether an application is complete and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review. Because Los Angeles County has 88 incorporated cities, the counter you deal with and the local standards you face can change from one address to the next even when the underlying state statute stays the same. No unusual local overlay applies in Paramount, so the building code and the age of your house are the two things that drive most decisions.

That second point matters a great deal here. Paramount incorporated in 1957 after the Hynes and Clearwater communities merged nine years earlier, and almost all of the housing stock dates from that postwar period. Small single-story houses on compact lots define the city, and many of those homes originally sat on what had been hay and dairy land. The lot size and the era of construction are what shape where a detached unit can sit, how far utility lines need to run, and whether a garage conversion or a new detached build makes more sense for your parcel.

We walk every parcel before drawing anything, checking setbacks, grade, equipment access, and utility routes. State law does set a floor that protects you regardless of local conditions: a city cannot cap an ADU below 850 square feet of interior livable space, or 1,000 square feet if the unit has more than one bedroom. Side and rear setbacks cannot exceed four feet. Owner-occupancy cannot be required. Adding an ADU cannot trigger a fire sprinkler retrofit of the main house, and there are no impact fees on a unit of 750 square feet or less.

One broader caution is also worth keeping in mind. The county’s own ADU ordinance, which governs unincorporated territory rather than incorporated cities, was amended in July 2025 and then found non-compliant with state law by the California Department of Housing and Community Development in December 2025. Among other findings, it caps detached ADUs on a multifamily lot at two where state law allows up to eight. Paramount is an incorporated city, so that county ordinance does not apply here, but the situation is a clear reminder that a local handout is not always current with the statute. We read the code, not just the summary sheet, before we advise you on what your lot can support.