Affordability, by design
In a market this expensive, the most credible lever isn't a cheaper house, it's an income unit. Buy a well-built fixer with real potential, add an ADU whose rent covers its own construction debt, and a home you couldn't otherwise carry becomes carryable. Move the sliders.
Does the ADU pay for itself?
Concept estimates only, not an appraisal, quote, or financial advice. Assumes a renovation/construction-to-perm loan financing reno + ADU on as-completed value, property tax ~1.25%, insurance + maintenance ~$600/mo, ADU vacancy/management 15%, ADU financed at the project's loan-to-value. Historic-overlay (HPOZ) neighborhoods can raise ADU cost and timeline.
Send me a listing and I'll run the design and the numbers: structure, potential, ADU feasibility, and the all-in math.
The model compares two monthly numbers: the cost of carrying the main home alone, versus the cost of carrying the main home plus an ADU minus the net rent that ADU generates. When net rent (rent minus vacancy and upkeep) covers the construction-loan payment, the ADU pays for itself. Anything beyond that lowers your real monthly cost on the main home.
Property tax 1.25%, insurance 0.35%, and maintenance 1% of value per year on the main home. ADU build cost is financed at the chosen construction-loan rate over the chosen term (typically 30 years for stabilized financing). Concept estimates only; permits, timeline, lot fit, and zoning are not modeled.
Net ADU rent (rent minus a vacancy and upkeep allowance, typically 12%) is greater than or equal to the construction-loan payment for the build. At that point the unit is self-sustaining and any additional rent reduces your main-home monthly cost.
A 600-to-900-square-foot ADU typically runs $180K to $300K all-in, depending on site conditions, finishes, and whether it's a conversion, attached addition, or detached build. Premium designs and difficult sites run higher.
A well-built one-bedroom ADU on the Westside typically rents in the $2,200 to $3,400/month range; coastal pockets and design-led builds reach $3,800+. Inland pockets land closer to $1,800 to $2,400.
Not modeled here. LA ADU timelines run 12 to 18 months from concept to occupancy, with the permitting and design phase typically 4 to 6 of those months. Plan for the carry cost during the build window.
The model uses stabilized long-term financing (cash-out refi or HELOC at amortized terms) as a planning baseline. Short-term construction loans typically refinance into 30-year financing once the ADU is complete and producing rent.