The Quiet Opportunity on Multifamily Lots
Most ADU attention goes to single-family backyards, but the bigger math often lives on multifamily parcels. Van Nuys is full of them — duplexes, fourplexes, and mid-century apartment buildings along Sepulveda, Sherman Way, and Vanowen, many sitting on generous lots with underused yard, storage, and carport space.
California has been widening the multifamily ADU lane for years, and recent legislation pushed it further: detached ADUs on multifamily lots — up to as many as eight on larger properties, tied to existing unit count — plus conversion units carved out of non-living space. For an owner, that's new rentable doors on land already paid for, in a rental market as tight as the Valley's.
We build these as a licensed general contractor working the San Fernando Valley every week — the same crew and permit discipline as our single-family backyard ADU builds, scaled to multifamily reality.
What Your Property Can Actually Hold
The law sets the ceiling; the parcel sets the number. A real feasibility pass looks at existing unit count (which drives the allowed detached-ADU count), yard and setback room, where the sewer lateral and electrical service actually run, parking layout, and which non-living spaces — storage rooms, laundry rooms, carports — could convert.
Two patterns come up constantly in Van Nuys. First: the deep-lot fourplex with a rear yard that fits one or two detached units without touching existing parking. Second: the building with a row of carports or a storage wing that converts to units faster and cheaper than any new structure, because the shell exists.
We map both against your parcel in the first visit and give you the honest count — sometimes it's eight, more often it's two or three that actually pencil out.
Utilities, Tenants, and the Parts Single-Family Jobs Don't Have
Multifamily ADU work is regular construction plus logistics. Older buildings often need electrical service upgrades before new units can meter in, and LADWP lead times go on the schedule from day one — not discovered in month six. Sewer capacity gets checked against the added fixture count. Metering strategy (separate meters versus master metering with allocation) is an early decision because it shapes both construction cost and how you'll bill tenants for decades.
Then there's the fact that people live there. We phase work so buildings stay occupied — detached units first where possible, conversions sequenced area by area, noise and access windows agreed in advance. Keeping your tenants reasonably happy during construction is part of protecting the asset, and we treat it that way.
Permits and the Path Through LADBS
Multi-unit ADU packages run through the Los Angeles Department of Building and Safety like our other ADU work, with state ADU law setting review timelines. Plans cover the units themselves plus the site-level questions multifamily review adds — path of travel, trash access, and utility routing. Where a property qualifies, pairing the package with pre-approved plan options can shorten review on the detached units.
From there it's the build sequence we run on every project: foundations, framing, rough trades, staged city inspections, finishes, and certificates of occupancy — one accountable licensed contractor across the whole package rather than a different vendor per unit.
If you own multifamily property anywhere in the Valley and want the real number for your lot, the feasibility walk is free and the estimate is written. Worst case, you learn exactly what your parcel can hold.
Get a free multifamily ADU feasibility estimate
Tell us about your property and our licensed team will review the parcel, walk the site, and write you a free estimate with a realistic unit count. CSLB License #1160251. No cost, no obligation.
Van Nuys General Contractor ADU & Remodeling LLC is a licensed California contractor — CSLB License #1160251. We build ADUs, additions and remodels across Van Nuys and the San Fernando Valley, and every project is permitted and inspected through the city.
Frequently Asked Questions
How many ADUs can a multifamily property add in Van Nuys?
More than most owners think. California law now lets multifamily properties add detached ADUs — recent legislation raised the potential count to as many as eight on larger properties, tied to the number of existing units — plus conversion ADUs carved out of non-living space like storage rooms and garages. The exact number depends on your lot, so a feasibility check against your parcel is the honest first step.
Is multi-unit ADU construction different from building a backyard ADU?
Yes — it's the same building science with more moving parts. Multifamily projects add tenant logistics, bigger utility questions, accessible path-of-travel review, and sometimes multiple structures phased over time. The payoff scales too: several new rentable doors on land you already own, without buying another building.
What parts of an apartment property can become conversion ADUs?
Space that isn't currently livable — storage rooms, boiler rooms, attics, and carport or garage areas — can typically convert to ADUs under state law. These conversions are often the fastest wins on a multifamily lot because the shell already exists and the unit count doesn't depend on open yard space.
Will my utilities handle additional units?
That's one of the first things we check. Multiple new units can push an older building's electrical service, gas capacity, and sewer lateral past their limits, and LADWP upgrade lead times belong in the schedule from day one. Metering strategy — separate meters versus master metering — is a decision worth making early because it affects both cost and how you bill tenants.
Can the work be phased so tenants stay in place?
Usually, yes. Detached units in yard or parking areas go up with limited disruption to occupied buildings, and conversions get sequenced one area at a time. We plan around tenant access, noise windows, and parking from the start — an occupied building is a fact of the project, not an inconvenience to it.
What does a feasibility check cost?
The initial conversation and site walk are free. We review your parcel's zoning, existing unit count, yard and setback room, and utility situation, then tell you honestly how many units the property can realistically support and what they'd take to build. If the numbers don't work, you'll hear that too.