Why building an ADU might beat buying a second property in today’s unaffordable market
When LA homeowners look at the math of buying another property in this market, many are starting to ask a different question: what if the best investment is already sitting in their backyard?
ATTOM’s Q3 2026 Home Affordability Report found that homeownership remained less affordable than historical local norms in 98% of U.S. counties examined during the third quarter, with 570 of 583 counties failing to meet historical affordability benchmarks.
In Los Angeles County specifically, ownership expenses consumed 69.9% of typical wages, making the prospect of buying a second property feel, for most people, entirely out of reach. And that is before accounting for a 30-year fixed mortgage rate that, as of October 1, 2026, averaged 7.28%, up from 6.34% just a year earlier.
So if the door to purchasing another home is effectively closed for a wide swath of LA homeowners, where does opportunity live? Increasingly, the answer is on the same lot they already own.
Governor Gavin Newsom signed AB 956 on September 29, 2026, with the law taking effect January 1, 2027, increasing the number of detached, new-construction ADUs allowed under state ministerial approval on a single-family lot from one to two.
That is a meaningful shift.
AB 956 also prohibits homeowners associations from blocking ADUs that comply with state law, removing one of the more frustrating obstacles that had quietly stalled projects in HOA-governed neighborhoods from the Valley to the Westside.
The case for building rather than buying deserves honest scrutiny, because the costs are real.
New ADU construction in Los Angeles currently runs between $220,000 and $400,000, while a garage conversion, generally the more affordable path, falls between $100,000 and $200,000.
Permitting timelines and city-specific fees add to that, and anyone who has navigated the LADBS process knows that the budget on paper rarely reflects the budget in reality. The key is budgeting beyond just sticks and drywall: tariffs alone have added roughly $15,000 to $30,000 to a typical $280,000 detached new-build in Los Angeles since taking effect.
That is not a footnote; that is a real line item that needs to be in the pro forma from day one.
But here is where it gets interesting. A garage conversion at $150,000, placed on a lot where the owner already has equity, mortgage-free land basis, and potentially a strong rental market, looks very different from a $1 million-plus acquisition in a compressed market.
At an average construction cost of $310,000, one estimate puts the ADU payback period at approximately 11.2 years, before accounting for the resale value the unit adds to the property.
That calculus improves considerably for garage conversions at the lower end of the cost range, particularly in neighborhoods where rents remain elevated.
The practical takeaway is this: with acquisition becoming harder and Sacramento actively expanding what homeowners can build on land they already own, the most underutilized asset in Los Angeles real estate right now may be the existing backyard. That does not mean every property pencils out, and it does not mean skipping the homework on permits, site conditions, and floor plan privacy. It means the question “should I build or buy?” deserves a real answer before assuming the answer is always buy.
Sources: ATTOM Q3 2026 Home Affordability Report · Scotsman Guide, October 22, 2026 · California AB 956, backyardadu.net · California YIMBY, AB 956 · Russell Realty Group, October 2026 · aduzoning.org, ADU Cost Los Angeles 2026 · designonnpoint.com, ADU Cost 2026
If you own a home in LA and have ever wondered whether building an ADU makes more financial sense than buying a second property right now, reply and tell me your address or neighborhood. I’ll run a quick breakdown showing what an ADU could realistically cost you versus what buying again would look like in today’s market — so you have actual numbers to work with, not just gut feeling.
Recent Podcast Episode — The Key to the City of Angels
ADU Costs: Build on Your Property or Buy Again? | Gil Vaisman
Could building an ADU on the property you already own make more sense than buying another home? Los Angeles real estate broker and investor Rick Albert joins Go ADU founder Gil Vaisman to unpack accessory dwelling unit costs, garage conversions and the decision to build instead of move. Gil explains how a backyard project to help cover his mortgage became his business. rom privacy and floor plans to construction budgets, they discuss what homeowners can overlook. Gil also explains “property mining”: exploring the potential of the property you already own before purchasing another one.
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