Updated August 16, 2026
Yes, when it is permitted, finished, and rented — because on an income property, value follows net operating income, and a legal ADU adds NOI at a market rent that is not constrained by your existing rent roll. That last point is what makes ADUs unusually attractive on Los Angeles rent-stabilized buildings: a newly constructed unit is new construction, so it is generally not swept into RSO's rent limits the way the original units are. The caution is timing. A permitted, completed, leased ADU adds value. An ADU that is under construction, unpermitted, or exists only as a plan set at the time you sell adds far less than owners expect, and sometimes nothing.
The new unit rents at market. Your 1961 units may be renting at 40% below market under the ordinance. The new one is not.
Multifamily properties can add more than one. California's ADU framework allows multifamily properties to add units both by converting non-livable space — storage rooms, boiler rooms, garages — and by constructing detached units, with the allowable counts driven by the existing unit count and the specifics of the site.
It uses land you already own and are not being paid for. Rear yards, oversized parking areas, and unused garages produce no income today.
Parking requirements have loosened considerably. The removal of parking replacement obligations in many circumstances, particularly near transit, is what made large numbers of LA garage conversions feasible.
Owners tend to compute the new rent, divide by a cap rate, and treat that as the value created. Three things reduce it.
Construction cost is real and has risen sharply. The value created has to exceed what you actually spent, and LA construction costs have made marginal projects unattractive.
Time. Design, permitting, and construction on an LA ADU is measured in many months, and permitting timelines vary substantially by project. Capital is tied up throughout.
Appraisers are conservative on newly created units. Without a rent history, an appraiser may underwrite the new unit cautiously, which affects the loan the buyer can get against it.
The projects that work well are usually the cheap ones: converting existing enclosed space that already has structure, roof, and proximity to utilities. The projects that disappoint are ground-up detached construction undertaken specifically to improve a sale price.
Completed, permitted, and leased for a year: the best case. The income is real and provable, the permit record supports it, and the appraiser can underwrite an actual rent.
Completed and permitted but not yet leased. Still good. Buyers can see a finished, legal unit and will underwrite a market rent for it.
Under construction at the time of sale. Weak. Buyers discount for completion risk, cost overruns, and permitting uncertainty. You are usually better off finishing or not starting.
Permitted plans only. Modest value at best, and only to a buyer who wants that specific project. Most buyers form their own view of the site's potential regardless of your plan set.
Built without permits. Negative. This becomes the unpermitted unit problem — excluded from the appraisal, a question for the lender, and a disclosure item.
The honest advice is usually not to start. An ADU is a good project for an owner who intends to hold and collect the income for several years. It is rarely a good project as sale preparation, because the cost is immediate, the completion risk is yours, and the buyer will discount anything unfinished.
The better move before a sale is to make the potential visible and let the market price it: identify what the site could support, document the feasibility honestly, and let buyers who value development upside compete for it. Buyers pay for credible potential without the seller carrying the construction risk.
A finished, permitted, leased ADU on an LA rent-stabilized building is one of the few reliable ways to add income that is not capped by the ordinance, and it does translate into value. But it is a hold strategy, not a sale strategy. If you are selling soon, do not start construction — document the site's potential, disclose it accurately, and let buyers price the upside they intend to build themselves.
Is a new ADU subject to LA rent control?
Newly constructed units are generally outside RSO's rent limits as new construction, which is exactly why the strategy is attractive on older buildings. State-level rules can still apply depending on the unit and circumstances, so the specific unit's status is worth confirming rather than assuming.
Can I convert my garage if the building needs the parking?
Parking replacement requirements have been substantially relaxed under state ADU law, particularly for properties near transit. Whether your specific site qualifies depends on its location and configuration, and it is the first thing to check because it often determines feasibility.
Will the appraiser count the ADU income?
If the unit is permitted, finished, and rented, yes. If it is unpermitted, generally no. If it is finished but unleased, the appraiser will typically underwrite a market rent. The permit record is the dividing line.
Michael Sterman is Senior Managing Director Investments at Marcus & Millichap.
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