By Payman Shilian | The Shilian Group | Powered by Compass
Disclaimer: This article about Westwood zoning changes is for informational purposes only and does not constitute legal, financial, or development advice. Zoning regulations, building codes, and permit requirements change frequently. Homeowners and investors should consult qualified land use attorneys, architects, and city planning professionals before pursuing any development project.
Owning a home in Westwood has always meant owning valuable real estate. Today, more homeowners are asking a new question: can I build more on my property? California’s zoning landscape has shifted significantly over the past several years, and Westwood zoning changes are creating new possibilities for homeowners and investors across 90024. SB 9, which took effect in January 2022, allows qualifying single-family lots to be split into two parcels and permits duplex construction by right. AB 2011, which followed in 2023, opens certain commercially zoned parcels to residential development with streamlined approval. Combined with expanded ADU rules, these laws have changed what you can actually build on a Westwood property.
The headlines often make these laws sound simple. “Split your lot.” “Build four units.” “Increase your property’s value overnight.” The reality is far more nuanced. Whether your property qualifies depends on a combination of state law, City of Los Angeles regulations, lot size, zoning designation, access, existing improvements, hillside restrictions, and other site-specific conditions. For some homeowners, these changes create meaningful opportunities. For others, the highest and best use remains exactly what it is today: a well-maintained single-family home.
As a Westwood resident and Westside Los Angeles real estate specialist, I have been working the Westwood and Wilshire Corridor markets for 14 years and have closed 203 local transactions totaling over $210 million in career volume. I work with buyers, sellers, and investors who are evaluating how Westwood zoning changes affect property values, development potential, and long-term investment strategy. This guide covers what has changed, how these laws apply across different parts of Westwood, and the practical questions every homeowner should ask before considering development.
What SB 9 Actually Allows on Westwood Single-Family Lots
SB 9, formally the California Housing Opportunity and More Efficiency Act, created two separate provisions. The first allows an owner to build up to two residential units on a single-family lot without a conditional use permit or discretionary review. The second allows an owner to subdivide a qualifying single-family lot into two separate parcels, each of which can then support its own housing.
The duplex provision means that a Westwood homeowner with a qualifying lot can add a second unit to their property through a ministerial process. Ministerial means the city must approve the project if it meets objective zoning and building standards. There is no public hearing, no neighborhood notification, and no subjective design review beyond objective standards. This represents a significant shift from the discretionary approval process that previously governed most Westwood development.
The lot-splitting provision allows a qualifying parcel to be divided into two separate lots, each with its own legal description and APN. Each new lot must be at least 1,200 square feet, though the City of Los Angeles has established its own minimum lot size requirements that can be larger. Once split, each lot can support up to two units, meaning a single original lot could theoretically yield up to four units total.
Important Qualifications
Several conditions limit SB 9 eligibility. The property must be in an urbanized area, which all of Westwood qualifies for. The owner must sign an affidavit that they intend to occupy one of the units as their primary residence for at least three years after the split. The property cannot be in a historic district. The lot cannot have been established through a prior SB 9 split. Demolition of more than 25 percent of existing exterior walls may trigger additional requirements. Every project must still comply with objective development standards including setbacks, lot dimensions, height limits, utility access, fire safety, and building codes.
This is probably the biggest misconception surrounding SB 9: many homeowners assume every residential property qualifies. Two homes on the same street can have very different development potential based on existing zoning designation, lot dimensions, street frontage, easements, existing structures, historic preservation rules, hillside regulations, environmental constraints, and utility availability. Every parcel deserves an individual feasibility review.
How Lot Splitting Works in Westwood Specifically
Not every lot in 90024 is a strong candidate for SB 9 lot splitting, and understanding the practical limitations is important for anyone evaluating Westwood zoning changes for investment purposes.
Lot size is the first constraint. The City of Los Angeles requires each resulting lot to meet minimum size requirements based on the zone. In the R1 zones that cover most of Westwood’s single-family areas, the standard minimum lot size is 5,000 square feet. To split a lot into two parcels that each meet this minimum, the original lot typically needs to be at least 10,000 square feet. Many Westwood lots meet this threshold, particularly in Little Holmby and Comstock Hills where lot sizes commonly run 8,000 to 15,000 square feet and larger. South of Wilshire, lot sizes tend to be smaller and splitting becomes less practical.
Access and configuration present the second challenge. Each resulting lot must have independent access to a public right-of-way. Flag lots, tandem lots, and interior parcels with no street frontage can create complications. The existing home’s placement on the lot also matters. If the house sits centrally, creating two usable parcels with proper setbacks and access can be difficult without significant reconfiguration.
Hillside Restrictions
Properties in the Westwood Hills area and parcels above Sunset that fall within the Hillside Area or a Specific Plan may have additional requirements that limit what SB 9 allows. These properties often have slope-dependent setbacks, grading limits, and fire access requirements that constrain the buildable area on any resulting lot.
For homeowners considering a lot split, my recommendation is to start with a feasibility study from a qualified land use consultant who understands both the state law and the City of Los Angeles implementation. The state law provides the framework, but the city’s specific standards determine what is actually buildable on your parcel.
Why an ADU Often Makes More Sense Than a Lot Split
Although SB 9 receives most of the media attention, many Westwood homeowners ultimately decide that building an ADU better accomplishes their goals. This is one of the first conversations I have with homeowners. The question is not “can you split your lot?” but rather “what are you trying to accomplish?”
California’s ADU laws operate independently from SB 9 and allow homeowners to build a detached accessory dwelling unit up to 1,200 square feet on most single-family lots without discretionary approval. The unit can include a full kitchen, bathroom, bedroom, and living area, functioning as a fully independent home. A homeowner can also build a Junior ADU of up to 500 square feet within the existing footprint of the home.
Lower Costs, Simpler Process
For most homeowners, an ADU offers several advantages over a lot split. Construction costs are lower because the project is smaller in scope. Permitting is simpler and generally faster. The homeowner retains full ownership of a single parcel rather than managing two separate legal lots. The ADU provides flexibility for rental income, housing for adult children, guest accommodations, caregiver housing, or home office space without fundamentally altering the property. No subdivision is needed, which eliminates the survey, mapping, and legal costs that come with splitting a lot.
An ADU can be a detached structure in the rear yard, a garage conversion, or an attached addition. Garage conversions remain one of the most popular and cost-effective approaches because much of the structural shell already exists. The city cannot require replacement parking when a garage is converted to an ADU. My guide to building an ADU in Los Angeles covers the requirements, costs, and decision framework in detail.
When the Combination Makes Sense
The combination of ADU law and SB 9 is where Westwood zoning changes create the most significant density potential. A homeowner on a large lot could theoretically split the lot under SB 9, build a second primary unit on the new parcel, and add an ADU to one or both lots. Whether this is practically feasible depends on lot geometry, setbacks, existing improvements, and the homeowner’s goals. Few owners actually pursue the maximum-density scenario, but the legal framework now permits it.
Which Westwood Neighborhoods Are Most Affected
The impact of Westwood zoning changes varies significantly across the five core sub-neighborhoods, and two homes only a few blocks apart can have dramatically different development opportunities.
Little Holmby
Little Holmby is perhaps the most interesting case. The large lot sizes, often 10,000 to 20,000 square feet and above, make many parcels technically eligible for SB 9 lot splitting. However, technical eligibility does not necessarily make subdivision the best financial decision. Most buyers searching in Little Holmby are not looking for redevelopment projects. They want exceptional single-family estates. Architectural integrity, privacy, mature landscaping, and estate-sized parcels are part of what makes the neighborhood valuable. Splitting a $15 million estate on a 15,000-square-foot lot would often destroy more value than it creates.
The development potential here is moderate, and the investment opportunity is low to moderate. The most practical application in Little Holmby is a detached ADU that serves as a guest house, caretaker unit, or home office while preserving the character of the primary residence. In my experience, Little Holmby’s greatest strength is not its redevelopment potential but the long-term value of owning an exceptional property in one of West Los Angeles’ most desirable neighborhoods.
Comstock Hills
Comstock Hills offers more realistic SB 9 potential and represents one of the first neighborhoods I recommend for buyers evaluating long-term flexibility. Lot sizes in the 7,000 to 12,000 square foot range, combined with price points in the $3 million to $5 million range, create scenarios where additional development can generate meaningful value. Depending on the property, homeowners may consider adding an ADU, building a second residence where permitted, evaluating a potential SB 9 subdivision, or creating long-term rental income.
The development potential is moderate to high, and the investment opportunity is high. Not every property will qualify, and not every project will make financial sense. Construction costs remain high throughout Los Angeles, and development decisions should begin with a realistic feasibility analysis rather than the assumption that additional density automatically creates value.
South of Wilshire
South of Wilshire has the most active SB 9 implementation in Westwood and the greatest practical impact from California’s housing legislation. Lot sizes are often in the 5,000 to 8,000 square foot range, which limits lot splitting but supports ADU additions and duplex conversions. The price points also make the development math more favorable. Building a second unit on a $2.5 million lot can generate meaningful cash-on-cash returns, particularly given the rental demand from UCLA and Westside professionals.
The development potential and investment opportunity are both high. Many homeowners in this area view ADUs as long-term income-producing assets rather than simply additional living space. Garage conversions, detached ADUs, and attached additions are all common approaches. For many owners, increasing usable square footage produces a stronger return than pursuing a more complex subdivision. For current pricing by area, my cost guide covers the Westwood market by segment.
The Wilshire Corridor
The Wilshire Corridor is almost entirely unaffected by SB 9. These are condominium buildings governed by HOAs, and SB 9 does not apply to common interest developments. Owners should not expect lot-splitting opportunities. The Corridor’s development dynamics are governed by the existing high-rise zoning along Wilshire Boulevard, not by state lot-splitting laws. Value here is driven by building reputation, floor plan, views, HOA financial strength, amenities, renovation quality, and sales activity within the building. For investors, understanding each building is far more important than understanding statewide zoning legislation.
Westwood Village
Westwood Village is primarily higher-density zoning already. The residential inventory is condo-heavy, and the commercial zones along Westwood Boulevard may be affected by AB 2011’s commercial-to-residential conversion provisions. Investors watching this area should pay attention to how mixed-use redevelopment, commercial-to-residential opportunities, and transit-oriented development projects evolve. As Metro improvements continue expanding across the Westside, this portion of Westwood may experience continued redevelopment over the coming decade.
How Westwood Zoning Changes Affect Property Values
The value impact of zoning reform in Westwood is nuanced and often misunderstood. Many homeowners assume that more units automatically means more value. Real estate does not work that simply. A property’s value is ultimately determined by what buyers are willing to pay, and sometimes buyers pay a premium for redevelopment opportunities while other times they pay more for a beautifully maintained home they have no intention of changing.
Properties That Often Benefit
Development potential tends to have the greatest influence when the existing home is dated, the lot is unusually large, comparable redevelopment projects have demonstrated demand, construction costs support the economics, and buyers actively seek investment opportunities. A dated home on an oversized lot south of Wilshire that is worth $2 million as a residence might be worth $2.3 million to a buyer who plans to split the lot and build a second unit. The incremental value comes from the development option, not from the existing home.
Properties That May Not Benefit
For properties where the current use is already at or near the highest and best use, zoning changes have minimal value impact. Architecturally significant homes, trophy properties, luxury estates, homes with exceptional views, and historically important residences already command their highest value as single-family homes. Adding theoretical development potential does not necessarily make these homes more valuable. A well-maintained single-family home in Little Holmby that is worth $12 million as a residence is not going to be worth more because someone could theoretically split the lot.
For sellers evaluating how these changes affect their listing strategy, the key question is whether buyers in your price range and sub-neighborhood are evaluating development potential or residential quality. My guide on how to sell a house in Westwood covers the broader preparation framework, including how to position a property that carries development upside.
Common Mistakes Homeowners Make About Westwood Zoning Changes
Over the years I have worked with homeowners evaluating development options, several recurring assumptions about Westwood zoning changes tend to lead people in the wrong direction.
Assuming Every Lot Qualifies
Every property is different. Factors including zoning designation, lot dimensions, easements, hillside regulations, and historic status all influence eligibility. Two homes on the same block can have completely different development potential.
Believing Larger Lots Automatically Mean Profitable Redevelopment
Construction costs in Los Angeles remain high, and the development math needs to account for those costs, permit fees, utility connections, and the time value of money during the construction period. Neighborhood demand and resale value matter just as much as lot size.
Ignoring the Value of an ADU
For many homeowners, adding an ADU creates a better financial outcome with significantly less complexity than subdividing a lot. The lower construction cost, simpler permitting, and faster timeline make ADUs the more practical choice in most situations.
Making Decisions Before Consulting Professionals
A zoning feasibility review involving an architect, land use consultant, surveyor, and experienced real estate advisor can save substantial time and expense compared to discovering limitations after money has already been spent on plans or, worse, after closing on a purchase.
What Investors Should Know About Westwood Zoning Changes in 2026
Investors evaluating Westwood properties through the lens of zoning reform should focus on three practical considerations.
First, the rental demand fundamentals in Westwood are strong and improving. UCLA enrollment, Westside employment centers, and the Metro D Line extension all support long-term rental demand. Adding units through ADUs, SB 9 duplexes, or lot splits creates rental income opportunities in a market where rents are supported by structural demand drivers. My Westwood 90024 overview covers the demand fundamentals in detail.
Second, construction costs in Los Angeles remain high. Building an ADU in Westwood typically costs $250,000 to $500,000 or more depending on size, site conditions, and finish level. A ground-up second unit on a split lot can run significantly higher. The development math needs to account for these costs plus permit fees, utility connections, and the time value of money during the construction period.
Third, the entitlement process, while ministerial under SB 9, still takes time. Plan check, building permits, inspections, and utility coordination can stretch the timeline to 12 months or more from application to occupancy. Investors should underwrite a realistic timeline, not the theoretical minimum.
Before You Buy a Property for Its Development Potential
If you are purchasing a home because of Westwood zoning changes and you believe it offers redevelopment opportunities, do not rely solely on online zoning maps. Before removing contingencies, I recommend verifying the zoning designation, lot dimensions, easements, utility locations, historic status, hillside restrictions, access requirements, existing permits, and overall development feasibility. The cost of professional due diligence is almost always far less than discovering limitations after closing.
The City of Los Angeles ZIMAS tool provides zoning information for any specific address, but ZIMAS alone does not tell you whether a project is practically feasible. A preliminary feasibility review with a qualified land use consultant can answer questions about whether the zoning supports your goals, whether the lot is physically suitable, whether easements or access issues exist, and whether an ADU might accomplish the same objective with less complexity.
A Practical Decision Framework
When homeowners ask how Westwood zoning changes apply to their property and whether they should develop, I suggest working through four questions.
First, are you planning to remain in the home? If yes, an ADU may provide the flexibility you need without significantly altering your property. Second, are you primarily interested in generating rental income? If so, compare the projected cost and return of an ADU against more ambitious redevelopment plans. The simpler solution often produces the stronger financial outcome. Third, is your property already its highest and best use? Luxury homes in neighborhoods like Little Holmby often derive their value from being exceptional single-family residences, and redevelopment is not always the highest-value strategy. Fourth, are you buying primarily for development potential? If so, complete thorough due diligence before removing contingencies and never assume zoning maps tell the entire story.
Frequently Asked Questions About Westwood Zoning Changes
Can I split my Westwood lot under SB 9?
Potentially, if your lot meets the minimum size requirements after splitting, is not in a historic district, and is not subject to other disqualifying conditions. The most common limiting factor in Westwood is lot size. You generally need at least 10,000 square feet to create two lots that each meet the City of Los Angeles minimum standards. A feasibility study from a land use consultant is the right first step.
Can I really build four units on my Westwood property?
Depending on the property and applicable regulations, some qualifying lots may accommodate multiple residential units through a combination of SB 9 and California’s ADU laws. However, many practical factors influence whether that is achievable, including lot dimensions, existing improvements, setbacks, utility infrastructure, fire access, and building code requirements. For many homeowners, the maximum theoretical density is less important than identifying the most practical and financially beneficial use of the property.
Should I build an ADU or split my lot?
For most homeowners, I recommend evaluating an ADU first. An ADU typically involves lower construction costs, simpler permitting, faster approvals, and greater flexibility. It can generate rental income, house family members, or serve as guest accommodations without fundamentally changing the property. Lot splitting may make sense in certain situations, particularly on larger lots in neighborhoods like Comstock Hills, but it should not be viewed as the default solution.
Does SB 9 apply to Wilshire Corridor condos?
No. SB 9 does not apply to common interest developments, which includes all condominium buildings. The Wilshire Corridor is entirely unaffected by SB 9 lot-splitting and duplex provisions.
How do Westwood zoning changes affect my property value?
The impact depends on your specific location, lot size, and current use. Properties with large lots and dated improvements in areas like South of Wilshire may see value increases from development potential. Properties in prestige locations like Little Holmby, where the current use is already the highest and best use, are unlikely to see meaningful value changes from zoning reform.
How long does the approval process take?
Although qualifying SB 9 projects receive ministerial review, that does not mean approvals happen immediately. Most projects still require site evaluation, architectural plans, plan review, building permits, utility coordination, and inspections. Depending on the complexity of the project, timelines can vary considerably. Homeowners should plan for the permitting process to take months rather than weeks.
What can I build on my Westwood lot under current zoning?
On a standard R1-zoned single-family lot in Westwood, you can currently build one single-family home, one ADU, one Junior ADU, and potentially a second primary unit under SB 9. The maximum buildable area depends on lot size, setbacks, height limits, and floor area ratio requirements. The City of Los Angeles ZIMAS tool provides zoning information for any specific address.
Can I convert my Westwood garage into a rental unit?
In most cases, yes. Garage-to-ADU conversions are permitted under California ADU law and are one of the most cost-effective ways to add a rental unit. The city cannot require replacement parking when a garage is converted to an ADU. Building code compliance, fire egress, and utility connections are the primary requirements. For many homeowners, a garage conversion provides one of the best returns on investment among available improvement projects.
Does SB 9 apply to condominiums?
No. SB 9 applies only to single-family residential properties. Common interest developments including condominiums, townhomes governed by HOAs, and planned unit developments are not eligible for lot splitting or duplex-by-right construction under SB 9.
Do I need city approval to add a second unit under SB 9?
Yes, but the approval is ministerial, meaning the city must approve the project if it meets objective standards. There is no public hearing, no neighborhood notification requirement, and no subjective design review. The process goes through the Department of Building and Safety, not the Planning Commission.
Which Westwood neighborhoods are best for SB 9 investment?
South of Wilshire offers the most practical SB 9 investment opportunities because of its combination of workable lot sizes, accessible price points, and strong rental demand. Comstock Hills has potential for larger-lot splits. Little Holmby lots are technically eligible but the economics rarely favor splitting a high-value estate property.
Final Thoughts
Westwood zoning changes under SB 9, AB 2011, and evolving ADU rules have expanded what homeowners and investors can do with property in 90024. The opportunities are real, but they vary significantly by location, lot size, and investment strategy. The headlines tend to make redevelopment sound straightforward. The reality is more nuanced.
Some properties are excellent candidates for additional development. Others are already at their highest and best use as single-family homes. Understanding that distinction is where experienced local guidance becomes valuable. For many Westwood homeowners, an ADU may provide greater value than a lot split. Larger lots create more possibilities, but not guarantees. Neighborhood characteristics matter just as much as zoning. Development potential should always be evaluated alongside market demand, construction costs, and long-term ownership goals.
Whether you are exploring development potential on your existing Westwood property, considering adding an ADU, evaluating a possible lot split, or looking to acquire a property with zoning upside, I am happy to walk you through the specifics. You can reach me at (310) 299-7655 or pshilian@compass.com.
Disclaimer: This article about Westwood zoning changes is for informational purposes only and does not constitute legal, financial, or development advice. Zoning regulations, building codes, and permit requirements are subject to change. Consult qualified professionals before making development or investment decisions.
About the Author
Payman Shilian
Compass Real Estate Agent · Wilshire Corridor & Westwood Specialist · CA DRE 01913874
Payman Shilian has worked the Wilshire Corridor and Westwood markets for 14 years, closing 203 local transactions totaling over $210 million in career sales. Building-by-building expertise across The Carlyle, The Remington, The Wilshire, Beverly West, and the 40+ buildings of the Millionaires’ Mile. Persian and Farsi speaking. Doctorate of Pharmacy from UC San Diego. Designated Realtor for the City of Beverly Hills. Member, National Association of Realtors and California Association of Realtors. Philanthropic involvement with Children’s Hospital of Los Angeles.
Reach Payman directly: (310) 299-7655 · pshilian@compass.com · paymanshilian.com
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