Ministerial Isn’t Instant: Why an LA SB 9 Lot Split Still Needs a Feasibility Hire Before LADBS Drawings — ZIMAS Screen, Planning Map, Then Building Permits

Quick answer: An Encino SB 9 urban lot split is ministerial under Government Code §66411.7 — not instant. Los Angeles still runs a ZIMAS SB 9 Eligibility screen, then a City Planning parcel map (CP-3604/3605), and only after map recordation should you treat LADBS building drawings as the next hire file. Incomplete hillside geology or grading packages often prevent a filing from counting as “complete,” which stalls SB 450’s 60-day approve/deny clock. Hire feasibility before you pay for full LADBS construction drawings.

An urban lot split (ULS) under Government Code §66411.7 (SB 9, Atkins, Chapter 162, Statutes of 2021) is a ministerial subdivision of one single-family parcel into ≤2 parcels in an urbanized area. A two-unit development (TUD) under §65852.21 is the companion ministerial duplex path. ZIMAS is LA’s Zone Information and Map Access System. LADBS handles building permits; City Planning reviews the ULS parcel map. Encino is in the City of Los Angeles. SB 450 (eff. Jan 1, 2025) tightened timing. AB 1061 (eff. Jan 1, 2026) narrows historic exclusions. SB 1426 (eff. Jun 30, 2026) is a nonsubstantive annual-report reorganization — not a core ULS rewrite.

Key Takeaways

• Ministerial ≠ instant. Hire sequence: ZIMAS SB 9 Eligibility → City Planning parcel map (CP-3604/3605) → map recordation (typically before construction) → then LADBS drawings/permits.
• ULS (§66411.7): ≤2 parcels; roughly equal area; one parcel ≥40% of original; each ≥1,200 sf; SF zone; urbanized; §65913.4(a)(6)(B)–(K) as of Sep 16, 2021. No prior SB 9 ULS on the parcel; no adjacent split by same owner/concert.
• Owner-occupancy still required for ULS only: ≥3 years principal-residence affidavit (not for standalone TUD). LLCs generally ineligible. No perpetual covenant (HCD).
• Post-split: local agency not required to allow >2 units/parcel including ADU/JADU (§66411.7(j)). Combined TUD+ULS: not required to permit ADU/JADU on parcels using both (§65852.21(f)).
• SB 450: 60-day approve/deny or deemed approved; written deficiency comments; uniform objective standards. Incomplete hillside packages stall “complete.”
• AB 1061 narrows historic exclusions. SB 1426 reorganizes reporting — not a lot-split rewrite.
• This is a feasibility-before-LADBS-drawings hire article — not a unit-count FAQ, ZIMAS-only checklist, or AB 956/AB 684/Palisades/multifamily post. 121 has not published fees or case studies for this path.

What does “ministerial” actually mean for an LA SB 9 urban lot split?

Ministerial means fixed objective standards — not same-week recordation or starting full construction drawings first. LA practice still means a Planning parcel-map file with application materials (SB 9 Urban Lot Split Application and Specialized Requirements) and, for many Encino hillside lots, geology/grading documentation before the package is complete. If someone says “SB 9 is automatic, just draw the duplex,” ask which window: ZIMAS, Planning map, or LADBS. Those are three different hire files.

What should you verify on ZIMAS before anyone opens LADBS drawings?

Start at ZIMAS and read SB 9 Eligibility for the address. Confirm SF zoning, urbanized context, and overlays tied to §65913.4(a)(6)(B)–(K) as of Sep 16, 2021. ZIMAS is a screen — not a parcel map or building permit. Also check no-prior-ULS and no-adjacent-same-owner/concert rules before budgeting two new lots.

What are the hard ULS size, ownership, and unit-count rules?

Under §66411.7: ≤2 parcels; approximately equal area; one ≥40% of original; each ≥1,200 sf; SF zone; urbanized; no prior ULS; no adjacent split by same owner/concert. ULS owner-occupancy: principal residence ≥3 years via affidavit — not for standalone TUD; LLCs generally ineligible; HCD confirms no perpetual covenant. After split, §66411.7(j) and §65852.21(f) limit ADU/JADU assumptions on ULS and combined TUD+ULS parcels.

How do SB 450, AB 1061, and SB 1426 change the Encino hire calendar?

SB 450 (eff. Jan 1, 2025): approve/deny within 60 days after complete, or deemed approved; written deficiency comments; uniform objective standards. Incomplete hillside packages never cleanly start that clock. AB 1061 (eff. Jan 1, 2026) narrows historic exclusions — not permission to skip feasibility. SB 1426 (eff. Jun 30, 2026) is nonsubstantive reporting reorganization — not a §66411.7 rewrite.

Why do LA urban lot splits go to City Planning before LADBS drawings?

City practice separates map from buildings. ULS → City Planning parcel map; TUD → LADBS building permits. Map recordation typically precedes construction. Hillside Encino lots often need geology/grading stamps before either window treats the package as complete. Paying for full LADBS drawings before the Planning map path is feasible burns retainers on lots that cannot split — or that will not support the unit mix sold.

Design-build versus architect-now, contractor-later

Hire the team that will not open a full construction set until feasibility is written: ZIMAS eligibility; §65913.4(a)(6)(B)–(K) constraints; owner-occupancy/LLC eligibility; prior-split checks; Planning map completeness (including hillside geology/grading); then LADBS drawings for buildings the post-split unit rules allow. Architect-now / contractor-later is how duplex plans outrun Planning completeness and §66411.7(j) / §65852.21(f) unit ceilings.

How can 121 Design Build help Encino owners who need SB 9 feasibility before LADBS drawings?

121 Design Build is an Encino design-build firm. We will not take a retainer to “just draw the duplex” while the ULS is only a ZIMAS screenshot. For Encino / City of LA SB 9 feasibility sequencing — ZIMAS, Planning map, then building permits — our residential design-build and ADU & JADU diligence habits apply: one file tying statute eligibility, Planning completeness, and LADBS to the same calendar. We have not published fees or case studies for SB 9 ULS, and will not invent volumes or yields.

121 Design Build Inc., 17801 Ventura Blvd, 2nd floor, Encino, CA 91316. Call (424) 600-1100 or (424) 600-2100, email info@121designbuild.com, or visit https://www.121designbuild.com/. To review an Encino SB 9 ULS feasibility file before LADBS drawings, contact 121 Design Build or call (424) 600-2100. Bring the address, ZIMAS printout, any “ministerial means instant” flyer, and any architectural proposal that assumes the map is done.

Frequently Asked Questions

Is an SB 9 urban lot split in Los Angeles automatic or same-week?

No. It is ministerial under §66411.7, but LA still requires a City Planning parcel map path (and typically recordation before construction).

What is the right hire order: ZIMAS, Planning, or LADBS drawings first?

ZIMAS SB 9 Eligibility → City Planning ULS parcel map → LADBS building drawings after the map path is real.

Does owner-occupancy still apply to an urban lot split?

Yes for ULS (≥3 years principal-residence affidavit). Not for standalone TUD. LLCs generally ineligible. HCD: no perpetual covenant.

Can I assume ADUs on both parcels after an SB 9 split?

Do not. See §66411.7(j) and §65852.21(f).

What did SB 450 change for timing?

Eff. Jan 1, 2025: 60-day approve/deny after complete or deemed approved; written deficiency comments; uniform objective standards.

Do AB 1061 and SB 1426 rewrite the lot-split rules?

AB 1061 narrows historic exclusions. SB 1426 is nonsubstantive reporting reorganization — not a core ULS rewrite.

Is Encino under County Building and Safety for SB 9?

No. Encino is City of LA — use ZIMAS, City Planning, and LADBS.

Should I hire an architect now and a contractor after the map records?

Not if map feasibility is still open. Use a design-build feasibility gate first.

Has 121 published SB 9 lot-split fees or case studies?

No. We will not invent them.

Is this legal advice?

No. General information from a design-build/permitting perspective. Confirm LegInfo, City Planning, and LADBS on the specific address.

Sources

• California Government Code §66411.7 (urban lot split)
• California Government Code §65852.21 (two-unit development)
• California LegInfo: SB 450 (2023–2024)
• California HCD: SB 9 Fact Sheet (PDF)
• LADBS: Senate Bill 9 — Two-Unit Development and Urban Lot Split
• Los Angeles City Planning: Senate Bill 9
• Los Angeles City Planning: SB 9 Urban Lot Split Application (PDF)
• Los Angeles City Planning: SB 9 Urban Lot Split Specialized Requirements (PDF)
• ZIMAS — City of Los Angeles Zone Information and Map Access System

This article is general information from a design-build and permitting perspective and is not legal, tax, or investment advice. Confirm live City Planning and LADBS requirements on your specific address. Research date September 8, 2026. Encino is in the City of Los Angeles. ULS: Gov. Code §66411.7 (SB 9, Atkins, Ch. 162, Stats. 2021); TUD: §65852.21. ULS owner-occupancy (≥3 years) still applies to ULS only; LLCs generally ineligible; no perpetual covenant per HCD. Post-split unit ceilings: §66411.7(j), §65852.21(f). SB 450 (eff. Jan 1, 2025); AB 1061 (eff. Jan 1, 2026); SB 1426 (eff. Jun 30, 2026). LA practice: ZIMAS → Planning map → recordation → LADBS. Ministerial ≠ instant. 121 has not published fees or case studies for this path.

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