Duplex ADU in California

Duplex ADU in California

Member since 2019 · 13 posts · 3 votes

I just bought a duplex in Los Angeles which has a large backyard I am thinking about building another duplex in the back but I'm not sure if this I covered under the new ADU law that was passed.

I want to know if it is legal under the California ADU law to build another duplex in the back.

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Chris MasonPro Member
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Lender · CA · Member since 2015 · 9k+ posts · 10k+ votes
7y
Originally posted by @Teacha Wong:

I just bought a duplex in Los Angeles which has a large backyard I am thinking about building another duplex in the back but I'm not sure if this I covered under the new ADU law that was passed.

I want to know if it is legal under the California ADU law to build another duplex in the back.

More of an "FYI" than an answer to your question.

 A few days ago in my post history is a comment that started with "Danger, Will Robinson, Danger!" 

In that post I let the other OP, who posted a very similar question, know that if you add an ADU to a 2-4 unit, or multiple ADUs to a SFR, the property can no longer be financed by Agency backed 30YF good loans, and talked a bit about how that can drastically decrease the market value of the property. I posted a link to the guideline. If you never intend to sell or refinance this property, of course that does not matter.

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  • Rental Property Investor · Torrance, CA · Member since 2016 · 263 posts · 132 votes
    7y

    @Teacha Wong

    I don't think that you can add an ADU to a duplex under the existing ordinance. I sent a link that might be helpful below.

    http://planning.lacounty.gov/assets/upl/project/adu_summary.pdf

    I’m not familiar enough with the new laws yet to comment on what will be possible. However, maybe you could look at rezoning your property for additional units (R-3).

  • Chris MasonPro Member
    Moderator
    Lender · CA · Member since 2015 · 9k+ posts · 10k+ votes
    7y
    Originally posted by @Teacha Wong:

    I just bought a duplex in Los Angeles which has a large backyard I am thinking about building another duplex in the back but I'm not sure if this I covered under the new ADU law that was passed.

    I want to know if it is legal under the California ADU law to build another duplex in the back.

    More of an "FYI" than an answer to your question.

     A few days ago in my post history is a comment that started with "Danger, Will Robinson, Danger!" 

    In that post I let the other OP, who posted a very similar question, know that if you add an ADU to a 2-4 unit, or multiple ADUs to a SFR, the property can no longer be financed by Agency backed 30YF good loans, and talked a bit about how that can drastically decrease the market value of the property. I posted a link to the guideline. If you never intend to sell or refinance this property, of course that does not matter.

  • Member since 2019 · 13 posts · 3 votes
    7y

    Thanks very timely information 

  • Investor · Los Angeles, CA · Member since 2012 · 1k+ posts · 500 votes
    7y
    @teacha there may be a new bill or something passing in regards to allowing this but unclear on its status or how city's are going to interpret it. Best thing to do is to go talk to the city. The Building and safety division will point you in the right direction.
  • Real Estate Agent · Inglewood, CA · Member since 2015 · 295 posts · 150 votes
    7y

    @Chris Mason I searched and cannot find the comment re the impact adding the ADU can have. Can you please copy paste or post a link. I'm repping a buyer on an SFR/legal ADU deal in Carson and after multiple revisions and QC request the appraisal came in very low today. They gave the ADU no value, and would not even factor it into the square footage. This morning I discovered that FHA appraisal guidelines only give value to attached ADUs with interior access from the primary residence, I played stupid and requested a revision while looking into conventional guidelines. Hoping they do not know the FHA guideline so we can push the value. Thanks for sharing.

  • Chris MasonPro Member
    Moderator
    Lender · CA · Member since 2015 · 9k+ posts · 10k+ votes
    7y
    Originally posted by @Clarence Johnson:

    @Chris Mason I searched and cannot find the comment re the impact adding the ADU can have. Can you please copy paste or post a link. I'm repping a buyer on an SFR/legal ADU deal in Carson and after multiple revisions and QC request the appraisal came in very low today. They gave the ADU no value, and would not even factor it into the square footage. This morning I discovered that FHA appraisal guidelines only give value to attached ADUs with interior access from the primary residence, I played stupid and requested a revision while looking into conventional guidelines. Hoping they do not know the FHA guideline so we can push the value. Thanks for sharing.

     

    https://www.biggerpockets.com/forums/52/topics/762712-california-adu-business

  • Developer · Sacramento, CA · Member since 2016 · 464 posts · 143 votes
    7y

    @Clarence Johnson you really have to find the right appriasal in most of these situations. the extra space that comes with all the benefits of an ADU should absolutely add more value to the property. question is how much.

  • Rental Property Investor · Santa Monica, CA · Member since 2018 · 45 posts · 22 votes
    6y

    @Teacha Wong I believe according to the new legislation effective on 1/1/20 multifamily-zoned properties will be allowed to have ADUs, but much uncertainty remains as to who can do what until the state releases regulations in mid-December. Having said that, the answer to your question is most likely "no" because if a law was passed that allows for essentially doubling the density of a multifamily lot, everyone would've heard about it by now.

    I'm guessing the most you'll be able to do is add a Junior ADU (small ADU that must be attached to the main property) plus a conventional detached ADU on the same lot. And that's if your city sticks with a liberal interpretation of state law and doesn't try to impose additional restrictions.

  • Member since 2019 · 13 posts · 3 votes
    6y

    Thanks very much learn a lot

  • Investor · Walnut, CA · Member since 2017 · 72 posts · 37 votes
    6y

    My group is in Socal, we got a property with some yard with a pool and planned on removing pool to put a modular ADU on it . Hired a large, well-researched business that does about 2 large ADUs per month. Even with the state's new adu regulation, my city in Walnut enacted a loophole with minimum lot size of 18K sqft and set backs extremely long (property line to housing wall). Property was near a bus stop (5 residental blocks away), it's on a corner so we had ample parking on 2 sides. City didn't allow the ADU company to proceed. One angle that may work is constructing attached addition. Our city has some hills and retaining walls or walls in general are very very sensitive to our city inspectors so that's another hurdle you may be weary of. We're out $3K for the process, planning. (It was suppose to be credited to the project).

  • Whittier , CA · Member since 2013 · 176 posts · 96 votes
    6y
    Originally posted by @Drew Leo:

    My group is in Socal, we got a property with some yard with a pool and planned on removing pool to put a modular ADU on it . Hired a large, well-researched business that does about 2 large ADUs per month. Even with the state's new adu regulation, my city in Walnut enacted a loophole with minimum lot size of 18K sqft and set backs extremely long (property line to housing wall). Property was near a bus stop (5 residental blocks away), it's on a corner so we had ample parking on 2 sides. City didn't allow the ADU company to proceed. One angle that may work is constructing attached addition. Our city has some hills and retaining walls or walls in general are very very sensitive to our city inspectors so that's another hurdle you may be weary of. We're out $3K for the process, planning. (It was suppose to be credited to the project).

    The new California Law starting in 2020 prohibits minimum lot size. You may want to talk to planning. 

    "The new law further prohibits local agencies from adopting ADU ordinances that: impose minimum lot size requirements for ADUs; set certain maximum ADU dimensions; require replacement off-street parking when a "garage, carport or covered parking structure" is demolished or converted to construct the ADU"

  • Investor · Walnut, CA · Member since 2017 · 72 posts · 37 votes
    6y

    Good to know. Will try again then. The adu company did say they are willing to help work another project if I had one for free. 
    Have you worked an adu project yet?  What project would be a ideal for you?

  • Rental Property Investor · Long Beach, CA · Member since 2019 · 145 posts · 49 votes
    6y
    Originally posted by @Drew Leo:

    My group is in Socal, we got a property with some yard with a pool and planned on removing pool to put a modular ADU on it . Hired a large, well-researched business that does about 2 large ADUs per month. Even with the state's new adu regulation, my city in Walnut enacted a loophole with minimum lot size of 18K sqft and set backs extremely long (property line to housing wall). Property was near a bus stop (5 residental blocks away), it's on a corner so we had ample parking on 2 sides. City didn't allow the ADU company to proceed. One angle that may work is constructing attached addition. Our city has some hills and retaining walls or walls in general are very very sensitive to our city inspectors so that's another hurdle you may be weary of. We're out $3K for the process, planning. (It was suppose to be credited to the project).

    Drew check this out too, the regulatory state agency for ADU's:

    https://www.hcd.ca.gov/policy-research/AccessoryDwellingUnits.shtml

  • los angeles, CA · Member since 2017 · 31 posts · 5 votes
    6y

    @Teacha Wong

    No you can't add 2 more ADU from the backyard of your duplex, that's not how it work, you might be able to convert space from those current Duplex into ADU

    Adding more unit will prob not going to work either, only ADU allows for parking exemption, biggest deal breaker in adding unit is parking.

    New bill didn't address the maximum size of ADU plus JADU so that's up for clarification.

  • Member since 2020 · 4 posts · 2 votes
    6y

    @Teacha Wong there are a couple of ways to do this.

    1. If the zone allowes it, get a building permit for 2 units.

    2. Obtain a zone variance.

    Do you know the zone you are in?

  • Member since 2019 · 13 posts · 3 votes
    6y

    @Anakaren Muro

    I’m located a 2 blocks from the new Rams stadium currently under construction. 

    Also there is a garage in the back I’m thinking about converting those into 2 units would like additional advice.

  • Rental Property Investor · Phoenix, AZ · Member since 2016 · 553 posts · 314 votes
    6y

    There was a panel on ADUs held by FIBI South Bay this week and a senior planner from LA (City) explained the new law.

    You can add two one story ADUs behind a MF building. So a duplex can become a fourplex with no additional or replacement parking.

  • Developer · Los Angeles, CA · Member since 2016 · 10 posts · 5 votes
    6y

    @Teacha Wong

    Hey bud, just saw this message and by now you probably built your ADU's lol

    Overall, yes, you are allowed to build multiple ADU's in multifamily zones. You must meet all required setbacks, and you won't be able to build taller than 16' overall unit height. This means that your adu will have to be single story. This makes it harder to achieve multiple ADU's in smaller spaces.

    Good luck! Let me know if you were able to build!

  • Member since 2019 · 13 posts · 3 votes
    6y

    @Zabdiel Lugo Thanks very much for your timely advice, we are currently in the planning phase of construction. Actual construction will begin soon I’m excited to see the process

  • Lender · Irvine, CA · Member since 2018 · 71 posts · 15 votes
    6y

    @Teacha Wong Excited for you! Were you able to get permits to build 2 ADU's in the back? When I read the ordinance, I read it as 25% of units, or 1 minimum unit is allowed. @Seth Borman also mentioned 2+2 is possible. I'm curious to know. 

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