ADU Cost in Los Angeles: What It Actually Runs in 2026
Prefab starts at $115,000. Custom site-built runs $400 to $600 per sq ft depending on style. Here is where every dollar goes, and the four line items that wreck budgets in LA.
RulesCalifornia ADU Laws and What They Mean in Los Angeles
California ADU laws override most local restrictions. Here is what Los Angeles must allow, what it can still regulate, and where homeowners get told no when the answer is legally yes.
RulesSB 9 in California: Lot Splits and How They Compare to an ADU
SB 9 lets you split an urban single-family lot in two and put two units on each half. It is not an ADU, the restrictions are heavier, and for most LA homeowners the ADU is still the better move. Here is how to tell.
ProcessHow Long Does It Take to Build an ADU in Los Angeles?
How long does it take to build an ADU? Nine to twelve months from first call to certificate of occupancy for a detached unit in Los Angeles. Here is the month-by-month breakdown and the five things that actually cause delays.
ReturnsDoes an ADU Increase Property Value in Los Angeles?
Does an ADU increase property value? Yes, and in Los Angeles the increase tends to track the income the unit produces rather than its construction cost. Here is how appraisers actually treat it, and why permitted matters enormously.
ComparisonDetached ADU vs Garage Conversion: Which Suits Your LA Lot?
Detached ADU vs garage conversion, decided properly. A garage conversion costs far less. A detached ADU rents for more and adds more value. For most LA lots the deciding factor is not budget, it is whether the garage is tall enough.
RulesADU Setback Requirements in California: The Four-Foot Rule Explained
ADU setback requirements are the first thing that decides whether a unit fits. Four feet from the side and rear property lines, statewide, and cities cannot demand more. Here is how the rule works on real lots, what happens under five feet, and the conversion exemption.
ProcessThe LA ADU Standard Plan Program: Pre-Approved Designs Explained
The LA ADU Standard Plan program removes the architectural plan check entirely. Los Angeles pre-approved a catalog of ADU designs so the architectural review is already done before you apply. Here is what the program actually skips, what it does not, and how to tell if a standard plan fits your lot.
CostsBuilding a Hillside ADU in Los Angeles: What the Slope Really Costs
A hillside ADU in Los Angeles is a different project from a flat-lot build. Silver Lake, the Hollywood Hills, Mount Washington, the Verdugos: the best rents sit on the worst terrain. Here is what the hillside ordinance requires, where the extra money goes, and when the slope kills the project.
RulesADU Kitchen Requirements and Utility Rules in Los Angeles
ADU kitchen requirements are what legally separate a dwelling from a shed, and the utility connections are where LA budgets quietly blow up. The actual requirements, and the three checks that protect the budget.
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