Homeowners usually want two different answers from an ADU analysis: how much the unit may contribute to the value of the whole property and how much gross monthly rent it may generate. A cap rate helps answer the first question from the second without pretending the ADU is sold separately or simply adding up decades of rent.
HABU separates potential added property value, estimated gross monthly rent, and the modeled return after project cost so you can decide whether professional review is worth the next expense.
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Cap rate equals annual net operating income divided by property value. Rearranged for an income approach, income-indicated value equals annual net operating income divided by the applied cap rate.
Gross rent is the rent collected before normal property-level operating costs. Net operating income, or NOI, is the stabilized annual rent remaining after an allowance for vacancy and operating expenses. Financing payments, depreciation, and an owner’s personal tax position are separate from this property-level screen.
At $2,300 per month, annual gross rent is $27,600. After setting aside the applied operating and vacancy allowance, the remaining net operating income is divided by the cap rate. At a 5.0% cap rate, every $1,000 of annual NOI supports about $20,000 of income-indicated value. That is a valuation lens—not a promise that a buyer will pay exactly that amount.
For the same NOI, a lower cap rate produces a higher indicated value and a higher cap rate produces a lower value. That is why a responsible report identifies the applied screening assumption and avoids presenting the result as a guaranteed appraisal.
HABU converts one stabilized year of local rent into an income-indicated value, after an operating allowance, then compares that result with permit-linked resale evidence. The report uses the central agreement between those lenses for homeowner planning and keeps the wider range for internal downside testing.
HABU does not let the income lens grow without a market cross-check. The reviewed screening policy caps an income-indicated scenario at 2.5 times its corresponding permit-linked resale contributory proxy and records whether that guardrail applied. This is a model guardrail, not a cap rate or an appraisal standard.
It does not assume the ADU is separately sold, does not add 20 years of gross rent, and does not replace an appraisal, rent study, construction budget, lender review, or site-feasibility review.
HABU separates potential added property value, estimated gross monthly rent, and the modeled return after project cost so you can decide whether professional review is worth the next expense.
Free screening result. Not a permit approval, appraisal, construction bid, or offer to buy.
An income-indicated value is useful, but it should be compared with resale evidence, project cost, site fit, and the other practical paths available to the owner.
Higher sustainable rent can support a higher income-indicated value, but operating expenses, vacancy, the cap rate, project cost, property condition, site fit, and buyer evidence still matter.
No. Cap rate relates property-level NOI to value. Return on investment compares a modeled gain or shortfall with the project investment. Financing and an owner’s tax situation can change their personal result.
The income approach reflects what the unit may earn. Resale evidence provides a separate market lens for how permitted living area may contribute to the value of the whole property. Comparing them is more responsible than relying on either one alone.
No. It is a screening calculation using reviewed assumptions. A licensed appraiser, qualified rent professional, lender, and project team may reach a different property-specific conclusion.
Review the pathway, possible owner outcomes, and items that still need validation.
Screen a specific property for the ADU pathway and its practical cost drivers.
Compare ADUs with SB 9 units, lot splits, and redevelopment paths.