Sherman Oaks ADU — 750 sqft AB 1033 Condo-Separable Build (14 weeks, $195K–$265K)

The parcel was a 7,900 sqft R1-zoned lot in a flatland stretch of Sherman Oaks north of Ventura Boulevard. The primary residence was a 2,100 sqft 1954 ranch at the front of the lot with an unpermitted tool shed at the rear-alley setback. Rear-yard area available for the ADU was 1,850 sqft after required setbacks — comfortable for a 750 sqft footprint plus the required 4-foot side-yard clear.

The homeowners were deciding between a Junior ADU (JADU — interior conversion) and a detached ADU. We scoped both. The JADU option pencilled at $140,000 but was capped at 500 sqft under state JADU statute and required shared egress through the main house. The detached ADU at 750 sqft at $220,000 delivered a genuinely standalone unit — separate address, separate utility meters, separate entry — and qualified for AB 1033 condo-separation.

AB 1033 (2024, effective January 1, 2024) allows a local jurisdiction to permit ADUs to be sold separately from the primary residence as condominiums. LA adopted the enabling ordinance in late 2024. Structuring the ADU to be AB 1033-eligible at build-time costs almost nothing extra but preserves a $600K+ optional exit for the owners — separate utility meters, a clear common-area boundary on the site plan, and CCRs drafted to HOA standards. We delivered all three; the owners can now file the condo map at their discretion.

SB 9 (2021) lot-split eligibility also came up in scoping. The parcel qualified under SB 9 for a potential two-lot subdivision, but the owners were not pursuing a subdivision — they wanted the ADU as a rental and optional future condo-sale asset. We noted the SB 9 eligibility in their project documentation as a preserved future option, but built the ADU on the existing single-parcel legal description. AB 1033 and SB 9 are not mutually exclusive; the owners retain both levers going forward.

California Government Code §65852.2 gives ADUs on single-family lots a by-right entitlement — no CUP, no discretionary review, no neighbor notification, and a 60-day ministerial plan-check clock. LA implements the state statute through LAMC 12.22.A.33.

We filed at LADBS Van Nuys as a ministerial ADU plan-check, not a standard plan-check. The submittal package ran: site plan with setbacks, elevations at 1/4-inch scale, floor plan, electrical one-line, plumbing riser, Title 24 CF1R-NCB (new construction residential) from a certified HERS rater, and a geotech letter confirming no slope stability concerns (the lot is flat — the letter was 1.5 pages).

Plan-check returned at 38 calendar days with two correction items (a CF1R line-item clarification and a sewer-lateral detail callout) that we cleared in three days. Permits issued at 41 days — inside the §65852.2 60-day window.

We also evaluated the LADBS Standard Plan Program option. The program offers pre-approved ADU designs that cut plan-check from the 60-day ministerial window to roughly 4 weeks. Four pre-approved designs would have fit the parcel, but the owners wanted a specific roof pitch and fenestration pattern matching their main residence — so we filed custom plans and absorbed the 41-day timeline. On projects where design customization is not a priority, the Standard Plan Program is the fastest permit path in LA for ADUs under 1,200 sqft.

LAMC Section 12.22.A.33(c)(4) requires a 4-foot side-yard and rear-yard setback for ADUs. Our design initially placed the rear wall at 3-feet-8-inches to maximize the interior layout — which triggered a variance requirement under a narrow reading of the code.

We caught it in pre-submittal review and re-drew the floor plan with the rear wall pulled to 4-feet-2-inches clear. The interior lost 24 sqft on the loft, which we absorbed by raising the plate height from 8 feet to 9 feet and using the vertical volume for a built-in bunk nook. Net effect: zero variance filing, zero neighbor noticing, zero §65852.2 delay.

On any Sherman Oaks or Encino R1 ADU, a 4-foot minimum on both side and rear is the simplest path. Variance filings add 6-10 weeks and $3,500-$6,000 in filing fees plus staff time. Designing to the code from day one is a better outcome than fighting it at plan-check.

The primary residence was on a 100-amp service — original 1954 main panel, still functional but at 78% load under our electrician's measurement. Adding an ADU with heat-pump HVAC, heat-pump water heater, induction cooktop, and a 240V Level 2 EV charger stub on the same meter would have hit 120% of the 100A rating.

We coordinated an LADWP service upgrade to 200 amps — pulled the application at week 2, LADWP scheduled the service upgrade for week 6, the swap-out took half a day. The primary residence kept its own meter; we landed a second meter socket adjacent to it for the ADU, feeding a separate 125-amp subpanel in the ADU's utility closet.

Cost of the LADWP coordination, new meter socket, underground service lateral to the ADU, and the 125-amp subpanel: $14,600. The separate meter is a hard requirement for AB 1033 condo-separation — shared metering disqualifies the parcel from future condo-mapping under the ordinance, so the meter split paid for itself the moment the homeowners opted into AB 1033.

The original sewer lateral serving the primary residence was pre-1970 vitrified clay pipe — brittle, root-intrusion-prone, and offset at two joints that we found during our video-camera inspection at week 4. The lateral ran directly under our planned ADU footprint.

Rather than route the ADU sewer separately (expensive — it would have required a 60-foot trench to the street main under driveway pavers), we replaced the full 80 feet of lateral from the house to the city main with SDR-35 PVC, installed a new cleanout at the parcel line, and tied both the primary residence and the ADU into the new lateral. The plumbing permit covered both parcels' service under a single filing.

Line item: $22,400. Not on the initial quote, disclosed to the homeowners at week 4 with video evidence and a change order. They approved same-day — the alternative was two pre-1970 clay pipes sharing a failure mode, which was not a viable long-term position on a parcel they might sell as condo-separate under AB 1033.

The ADU scope fell under Title 24 2025 new-construction residential rules (CF1R-NCB, not ALT). The 2025 update made heat-pump HVAC and heat-pump water heating effectively required for compliance without prescriptive workaround — the prescriptive path assumes electric heat pumps, and the alternative performance path requires significantly more envelope insulation than our lot could economically accommodate.

Our systems: Mitsubishi MXZ-3C30NA2 hyper-heat pump (multi-zone with two indoor cassettes), Rheem Proterra 50-gallon heat-pump water heater with a 4.04 UEF, 4:12 composition shingle roof with R-38 blown cellulose in the attic, R-21 batt in the 2x6 exterior walls, and dual-pane Milgard Tuscany low-E windows at U=0.27.

Title 24 2025 also triggered the JA8 lighting rule across the entire interior (not just hard-wired fixtures — plug-connected too, at least by recommendation). We specified JA8-compliant LED recessed in kitchen and bath, pendant over the breakfast bar, and wall sconces. HERS rater signed off on CF3R-NCB at week 13, one week before final inspection.

The Rheem Proterra heat-pump water heater qualifies for the TECH Clean California rebate (administered through LADWP for LA customers) at $2,300 on the 50-gallon unit. We filed the TECH rebate post-install with the LADWP verification inspection, and funds disbursed 42 days after submission. Coupled with the $2,000 federal Inflation Reduction Act 25C tax credit on heat-pump water heaters, the owners recovered $4,300 against the $5,800 installed cost — effectively netting a $1,500 out-of-pocket cost for a water heating system that will save them an estimated $340 per year on electricity versus a resistance-element electric tank.

Weeks 1-2: demo of the existing tool shed, site survey for the detached pad, LADWP service upgrade application, foundation layout. Week 3-4: footing and slab pour, sewer lateral replacement (the surprise item). Week 5-6: framing, LADWP service cutover. Week 7-8: sheathing, roofing, windows, rough MEP — electrical, plumbing, and Mitsubishi line-set install. Week 9-10: insulation, drywall, exterior siding (James Hardie panel + batten for a clean vertical read). Week 11-12: interior trim, kitchen cabinets (IKEA Semihandmade shaker fronts — an intentional budget move here; not every ADU needs custom millwork), tile, flooring. Week 13: paint, fixtures, appliances, HERS verification. Week 14: punch list, LADBS Van Nuys final, Certificate of Occupancy.

What mattered was the LADWP scheduling at week 2. If that application slips, the entire project slips — electrical rough can't pass without the service upgrade in place. We pre-staged the application at scoping, before permit pull, which gave us a 4-week buffer on the LADWP side that ended up being critical when their Van Nuys crew was 10 days backed up.

Final cost delivered: $228,400. Mid-band of our $195K–$265K quote at signing. Breakdown: foundation + framing + shell $78,200, MEP rough + LADWP upgrade $41,600, sewer lateral change order $22,400, roofing + siding + windows $28,100, interior finish + cabinetry + appliances $34,800, Title 24 systems (heat pump HVAC + heat pump water heater + ERV): $18,200, permits + HERS + geotech letter: $5,100.

The ADU is currently leased to a long-term tenant at $3,100/month. At the homeowners' current carrying cost on the $78K of owner equity they contributed (the balance covered by a HELOC), cash-on-cash is tracking at 21% annually pre-tax. AB 1033 condo-separation remains an open option; the owners have 18 months before they decide whether to file the condo map and list the ADU separately at a projected $625K.

Related: see the full pillar on [ADU construction in Sherman Oaks](/adu-construction-sherman-oaks) and the detailed regulatory breakdown at [AB 1033 condo-sale ADU guide](/guides/ab-1033-condo-sale-adu) for the sale-separation mechanics.