ADU Builders in Carson CA

ADU construction in Los Angeles ranges from $90,000 for a basic garage conversion to $450,000+ for a custom-built detached 1,200 sq ft ADU. Most of our clients invest between $180,000 and $300,000 for a turnkey project including permits, design, and finishes.

A typical detached ADU takes 6–9 months from permit submittal to final inspection. Garage conversions are faster — usually 3–4 months. Prefab ADUs can be installed in as little as 8 weeks once site prep and permits are complete.

Yes. All ADUs require a permit from LADBS or your local city building department. State law makes the approval process ministerial — meaning if your plans meet code, the city must approve them. We handle the entire permit process for you.

Yes. California state law allows you to rent your ADU long-term (30+ days). Short-term rentals like Airbnb depend on your local city ordinance — Los Angeles has additional restrictions.

Only the newly built ADU is reassessed. Your existing home keeps its current Prop 13 tax basis. Most homeowners see a tax increase of $1,500–$3,500 per year, depending on the ADU's assessed value.

A JADU is a unit up to 500 sq ft created within the walls of your existing home, with its own entrance and kitchenette. ADUs can be detached, attached, or converted and up to 1,200 sq ft.

Very often, yes. Carson's flat, open backyards are among the easier sites in the county for detached units. We confirm placement, size, and utility routes with a site visit and a feasibility review before design begins.

It depends on your lot and budget, but one- and two-bedroom layouts tend to balance construction cost against rental appeal. We walk through the trade-offs with real floor plans so you can decide with numbers in hand.