"Instead of honoring the detailed preservation plans with objective standards, almost nothing is regulated." That's Jane Usher, a Windsor Square resident who once chaired the city's own Planning Commission, describing a document most Hancock Park buyers will never read but that could decide what happens on the lot next to theirs.
The document is Los Angeles's draft Objective Design Standards for ADUs and infill housing inside Historic Preservation Overlay Zones, or ODS. The city released it on June 24, 2026. If you're evaluating a character home in Hancock Park or Windsor Square right now, with an addition, an ADU, or a second unit somewhere in the back of your mind, this is the paperwork that will eventually tell you what you're allowed to build. It isn't finished. And as written, it doesn't agree with itself.
Two Numbers That Don't Match
Here's the contradiction that has neighborhood leaders writing letters by the hundreds. The draft standard for a detached ADU says its height, measured from grade to the roof ridge, has to stay below the height of the primary residence. Reasonable enough. But the draft standard for infill housing, meaning new construction built on a lot split off from an existing property, allows that new structure to rise a full story taller than the historic house already standing there.
One of those numbers protects the streetscape rhythm that makes Hancock Park and Windsor Square worth their premium. The other one doesn't. Mary Pickhardt, an architect and Windsor Square resident who worked for years on that neighborhood's original HPOZ, has said the city can absolutely add density through ADUs, but the current draft needs more thought if the goal is preserving the scale and proportion that gives these blocks their identity. Right now the draft treats new backyard construction more strictly than it treats a brand new building on a subdivided lot, which is the opposite of how most residents assumed historic protection would work.
Why This Is Happening At All
None of this is optional for the city. State law now requires California jurisdictions to adopt design standards that are genuinely objective, meaning a planner can check a box rather than exercise judgment, before certain housing projects qualify for fast, ministerial approval. Los Angeles's existing HPOZ preservation plans, built around language like "should be compatible" rather than hard numbers, don't meet that bar. The ODS project is the city's answer: turn 35 preservation plans full of judgment calls into a smaller set of numbers that apply everywhere.
The trouble is that historic districts aren't actually interchangeable. A rule calibrated for a dense multifamily neighborhood doesn't automatically fit a district of 1920s Period Revival estates set back 50 feet from the curb, a setback G. Allan Hancock insisted on when he laid out the tract himself. Hancock Park Homeowners Association president Cindy Chvatal-Keane has pointed to a separate wrinkle: AB 1061, a state bill passed in October 2025 and effective January 1, 2026, already sets specific standards for splitting contributing lots inside HPOZs, and the current ODS draft doesn't yet account for it. Her point wasn't that the city should ignore state housing law. It's that, as she put it, "we can't base how we go forward based on one or two bills" when several are moving at once, each with its own definitions of what a historic lot can become.
The Calendar So Far
The timeline matters because it tells you how much of this is still genuinely unsettled heading into fall.
- March to April 2026 — City planning staff previewed the ODS concept to HPOZ boards and ran an online survey, with feedback due April 1 and a first virtual workshop on April 13.
- June 24, 2026 — The Office of Historic Resources released the actual draft standards for ADUs and infill housing, along with a fact sheet neighborhood leaders immediately flagged as misleading.
- June 30, 2026 — A second virtual workshop walked residents through the draft for the first time.
- July 21, then July 28, 2026 — The public comment window closed, after the city extended the original deadline by a week to allow more input.
- July 28, 2026 — The Greater Wilshire Neighborhood Council's Land Use Committee, covering Hancock Park, Windsor Square, Windsor Village, Wilshire Park, and Country Club Park, passed a detailed motion opposing the draft and asking the city to also fight a separate state bill, SB 1116, that would let single-family lots split into as many as 10 parcels as small as 800 square feet with ministerial approval.
- Fall 2026 — The city has said the revised draft moves to the Planning Commission and City Council next, with the broader project required to wrap by December 2026 under the terms of the federal grant funding it.
Residents in those five neighborhoods have sent the city more than 500 letters of opposition in the past month alone. That's not background noise. It's a live negotiation over the rules that will govern your renovation permit if you buy this year and don't break ground until next.
The Test Case Already Underway
This isn't theoretical. A project already proposed in the Angelino Heights HPOZ, another of the city's 35 historic districts, would use the new state lot-splitting laws to carve one property into 10 new lots holding 10 three-story townhomes, plus a remainder lot with the original historic house still on it. Whatever standards eventually apply to Hancock Park and Windsor Square will apply to projects shaped exactly like that one. If you want to know what "infill housing in an HPOZ" could look like on a real street, that's the closest live example anyone has right now, and it's the reason the height contradiction in the draft isn't an abstraction.
The city has been clear about one thing: the existing 35 preservation plans won't be thrown out. Where state law doesn't force jurisdictions into objective-standards-only review, the ODS will work alongside the current preservation plan guidelines, not replace them. The HPOZ Board still decides most rehabilitation projects. What's actually changing is narrower and more specific: how new construction and ADUs on eligible lots get approved, and how much room a planner has to say no.
What This Means If You're Buying, Selling, or Sitting on Extra Lot Depth
If you're touring a Hancock Park or Windsor Square property this year with development potential in mind, whether that's an ADU for a parent or a rental, or a future lot split, don't treat any number you hear about what's "allowed" as fixed. The standards that will govern that math are still being drafted and are opposed, in their current form, by the homeowners association and by residents who helped write the original preservation plans. A number that's true in August could be revised by the time the City Planning Commission takes it up this fall.
If you're the one selling a character home with unused lot depth or ADU potential, this cuts differently. Buyers doing real diligence right now are going to ask what the property's contributing or non-contributing status is, what's already been approved on it, and what the pending ODS could change. Having that history assembled before you list, rather than reconstructing it mid-escrow, keeps a motivated buyer from getting spooked by a regulatory story that's genuinely still in motion. It also lets you frame the property's development potential honestly instead of promising a number nobody can guarantee yet.
Either way, the HPOZ boundaries themselves aren't moving. What's moving is the fine print underneath them, and the fine print is where deals get delayed or renegotiated.
Frequently Asked Questions
Does this affect a Certificate of Appropriateness I've already been granted? No. The draft ODS governs future review of new ADU and infill housing applications. Approvals already issued under the existing preservation plan process aren't retroactively affected by a standard that hasn't been adopted.
Should I wait to buy or sell until the rules are finalized? That depends entirely on what you're trying to do with the property. If your plans don't involve new construction, a lot split, or an ADU, the current uncertainty has little bearing on your timeline. If they do, it's worth going into escrow with clear eyes about which parts of your plan rely on standards that are still being negotiated between the city and the neighborhood councils.
If you're looking at a Hancock Park or Windsor Square home with real renovation or ADU ambitions, the pending rules are exactly the kind of detail I walk clients through before they write an offer, alongside the property's actual permit history and contributing status. If you're preparing to sell a character home and want to talk through how to position its development potential honestly, I'd welcome the conversation. Ali Jack works Hancock Park and the surrounding historic districts every day. Let's Connect.
