ADU Constructionin Maywood, CA
ADU construction in Maywood follows state ADU law plus Zoning Ordinance 24-02, which added section 4070.120 in 2024. The ordinance is a scanned PDF we could not read, so confirm local size and parking with Planning. State law sets the clock: 15 business days to check completeness, then 60 days to decide, or the application is deemed approved.
Maywood has no vacant land. The City's Housing Element calls the accessory dwelling unit the most common development type here and says most current projects are garage conversions or demolitions of structures averaging 70 years old. A windshield survey in August 2021 found a visible ADU on more than 40 percent of parcels in the residential neighborhoods. Of 6,706 homes counted by the Census Bureau's 2024 estimates, 3,647 are single-family detached houses, and 4,572 of the 6,581 occupied homes are rented.
This page covers which rulebook governs, garage conversions and parking, legalizing old units, size and placement, renting and selling, soil and heat, and fees and the order of the job. The City's code page links no code host, so Municipal Code text comes from a third-party mirror, and the zoning ordinance the City posts dates from 2009. Confirm anything that matters with Planning. Price ranges and phases are on our ADU construction page.
Maywood Planning and Building rules that apply to ADU construction
Where adu construction permits come from in Maywood: City of Maywood Building and Planning Department, Building Division.
- The City's Standards, Permits and Maps page posts the 2025 ADU Handbook (the state HCD handbook dated January 2025) and Ordinance No. 24-02, which added Subsection 4070.120 to the Zoning Ordinance to set criteria for accessory dwelling units. The ordinance file is a scan I could not read, so no setback, size or fee number from it is stated here; ask Planning at (323) 562-5723.
- The Municipal Code's list of zoning ordinances (Title 9, Chapter 3) shows Ordinance 24-02, adding Subsection 4070.120 for accessory dwelling units, passed May 22, 2024, after Ordinance 23-08 (September 27, 2023) added EV charging streamlined permitting at 4100.140; the 2009 Zoning Ordinance PDF the City posts predates both. Mirror text.
- Maywood's 2021 to 2029 Housing Element reports that a windshield analysis in August 2021 found more than 40 percent of parcels in residential neighborhoods had a visible accessory dwelling unit, and says unpermitted garage conversions and ADUs are a continuing problem the City is tracking and bringing into code compliance.
- The Housing Element says the most common development type in Maywood is the ADU, that an ADU permit generally takes about two months with much of that spent helping owners meet plan requirements, and that most projects in the built-out city are garage conversions or demolitions of structures averaging 70 years old. It also reports 13 ADUs permitted in 2020 and 2021, with permits closed on only 9, and sets a program to permit at least 15 a year.
- The Housing Element says Maywood keeps its parking requirements because many residents drive pickup trucks and other large vehicles, that garage conversions have removed off-street parking, and that the City requires resident permits for overnight street parking on streets near the city boundary.
- Maywood's rent stabilization and tenant protection chapters define a rental unit to include accessory dwelling units, so an ADU that is rented is covered unless it falls under an exemption such as a certificate of occupancy issued after February 1, 1995. Mirror text.
How to build an ADU in Maywood: Ordinance 24-02, the 2025 handbook and what we could not read
The City's Standards, Permits and Maps page posts two documents: the 2025 ADU Handbook, which is the state housing department's handbook dated January 2025, and Ordinance 24-02, which added Subsection 4070.120 to the Zoning Ordinance to set ADU criteria. The mirror's list of zoning ordinances dates it May 22, 2024. The ordinance file is a scanned image, so we can quote no setback, size or fee from it.
State law fills the gap. Government Code sections 66310 through 66342 are the statewide ADU law, local rules must be objective standards, and a compliant application is approved ministerially with no hearing. Since January 1, 2026, under SB 543, an agency must say within 15 business days whether an application is complete and must decide within 60 days of a complete one, or it is deemed approved. The handbook the City posts was written before those changes.
So ask Planning for the adopted text of 4070.120 and for the local standards it applies on your lot, and get the reply in writing. The Planning Division also handles zoning review for the City's other small projects.
Garage conversion ADU in Maywood: lost parking, pickup trucks and the permit file
The Housing Element says garage conversions have already removed off-street parking in Maywood, that many residents drive pickup trucks and other large vehicles, and that the City therefore keeps its parking requirements and requires resident permits for overnight street parking on streets near the city boundary. State law points the other way for conversions: sections 66314 and 66322 bar replacement parking when a garage or carport is converted. Which one Planning applies is a written-answer question, and it comes before any drawing.
A conversion has other state protections. The existing structure keeps its footprint with no new setbacks, up to 150 square feet may be added for entry and exit, and the ADU cannot force fire sprinklers into the main house. That last point matters here, because the City's permit application asks whether the existing home has sprinklers.
Los Angeles publishes a detailed bulletin for converting an old detached structure, and our guide to garage conversion permit steps walks through it. Maywood's list may differ, and we found none. A 70 year old garage slab and wall framing are a site-visit question.
Can an unpermitted ADU or garage conversion be legalized in Maywood?
Often, and the City is already asking for it. The Housing Element calls unpermitted garage conversions and ADUs a continuing problem that the City is tracking and bringing into code compliance. With more than 40 percent of residential parcels showing a visible ADU in 2021, plenty of owners are in this position.
State law, in section 66311.7, says a city cannot deny a permit for an unpermitted ADU built before January 1, 2020 because of building code or ordinance violations, unless correcting them is needed to fix a substandard, unsafe condition under Health and Safety Code 17920.3. It also limits impact and connection fees for these units and allows a confidential third-party inspection. Proof of the build date helps, and we would start with old utility bills, leases and listing records.
Selling is the other trigger. Municipal Code Chapter 15 requires a Real Property Report before close of escrow. It lists any apparent nonconformity or illegality in the structures and permits not yet completed, and the inspection is from the outside unless the inspector has objective evidence of illegal subdivision of the main dwelling. It stays valid six months, which is a short window to fix surprises.
How big can an ADU be on a Maywood lot, and how close to the fence?
State law lets a detached ADU reach 1,200 square feet and bars a city from capping the maximum below 850 square feet, or 1,000 with more than one bedroom. Whatever local rules say, an 800 square foot detached unit with 4 foot side and rear setbacks must still be allowed, according to the state handbook, and no minimum lot size can be imposed. Base height is 16 feet, with more near transit or on a multistory multifamily lot, and a converted structure keeps its existing setbacks.
Maywood's own zoning text is from 2009 and has one residential zone, R-3, with a 5,000 square foot minimum lot, 65 percent building coverage and a two story or 35 foot limit. A lot under 50 feet wide may hold only a single-family home plus a second unit under that text, and accessory structures are limited to 12 feet in height with at least 6 feet to other buildings. State law overrides local numbers where they would block an 800 square foot ADU, so ask Planning which of these survive.
A corner lot, a narrow lot or a lot already covered by a duplex changes the sketch, so a survey comes first.
Renting out an ADU in Maywood: rent stabilization, the 30 day minimum and resale
State law bars an owner-occupancy requirement for an ADU and lets a city require rental terms longer than 30 days. In a city where most households rent, many owners build to rent. Maywood's rent stabilization and tenant protection chapters define a rental unit to include accessory dwelling units, so a rented ADU is covered unless an exemption applies, such as a certificate of occupancy issued after February 1, 1995. A new ADU would get its certificate long after that date, which points toward the exemption, but we did not read how the City applies it. Ask before you set a rent.
Selling is harder. State law does not allow an ADU to be sold apart from the main house, with two exceptions: a qualified low-income buyer through a qualifying nonprofit, or a city that has adopted a condominium ordinance. We did not read any Maywood condominium ordinance for ADUs.
Short-term rentals follow separate rules we did not research. On property tax, the Board of Equalization says new construction is assessed only on the portion added, at the market value it adds.
Soil, heat and the slab for a Maywood ADU: liquefaction zone and almost no shade
All of Maywood sits inside a California Geological Survey liquefaction zone of required investigation, from the South Gate quadrangle map released March 25, 1999. The City's 2023 Safety Element rates the potential very low north of Slauson Avenue, higher south of it and high in a small southeast corner. For a new detached unit on a new slab, expect the engineer to ask for a soils investigation. We found no City rule that sets the trigger, so ask Building and Planning at filing.
Heat shapes the design. At the nearest NOAA station, about 5 miles northwest, the average year has 25.6 days above 90 degrees and 1.8 above 100, and the Safety Element projects extreme heat days rising from about 2 to 8 to 10 a year by mid-century. Roughly 95 percent of the city lacks tree cover and every census tract is at least 70 percent impervious surface.
A small unit with one wall of glass will feel that. Insulation, shade and a light roof belong in the first sketch, and the state handbook says the Energy Code requires solar panels on a newly built detached ADU, though not on conversions or additions.
ADU fees, utility connections and the order of an ADU job in Maywood
Permit and plan check fees are set by City Council resolution under Municipal Code 8-1.02, and we found no published schedule, so we print none. State law adds a few fixed points. Section 66311.5 bars impact fees on an ADU of 750 square feet or less and on a junior ADU of 500 or less, and larger units pay in proportion to the main house. Utility connection and capacity charges are separate, though a unit converted from existing space cannot be forced to take a new connection.
The Housing Element says an ADU permit generally takes about two months, with much of that spent helping owners meet plan requirements. It also reports 13 ADUs permitted in 2020 and 2021 and permits closed on only 9, so book the final inspection and close the permit. Any work in the public right of way, such as a sewer tie-in, needs an encroachment permit, and every subcontractor needs a City business license.
MDG Builders, CSLB #1040337, designs the unit, files the permit and coordinates the schedule. The foundation, framing, plumbing and electrical crews are licensed subcontractors, and each one's license number and certificate of insurance are yours for the asking.
ADU photos from Maywood and nearby homes
ADU scenes tied to Maywood and the communities around it, from garage conversions and slabs to finished studios. Tap a photo to enlarge it.
What adu construction costs around Maywood
Our ADU construction page prices a garage conversion to a studio or one bedroom at roughly $100,000 to $200,000, and a new detached unit of 400 to 800 square feet at roughly $200,000 to $400,000. Three independent reads sit behind those ranges. A UC Berkeley survey of Los Angeles County households that finished or applied for an ADU in 2018 and 2019 found a median of $100,000, with garage units at $90,000 and detached units at $180,000. The Terner Center's 2020 estimate for Los Angeles was $148,000. Remodeling magazine's 2025 Cost vs. Value report puts a Los Angeles ADU at $178,536 and about 39.9 percent recouped at resale. None is a Maywood quote, the City posts no fee table we could read, and utility connection charges fall outside the state's impact fee exemption, so fees show up as separate lines in a written proposal. The ADU cost guide and the ADU versus JADU guide go deeper, and the room addition versus ADU guide helps when you are choosing. Neighboring cities apply the same state law their own way, so compare ADU construction in Bell, Huntington Park, Cudahy, Bell Gardens, South Gate and Los Angeles. A bathroom inside the unit is on our Maywood bathroom page, a larger attached addition on the Maywood room addition page, the unit's windows on the Maywood window page, and the Maywood area page lists every trade we cover in the city.
| What it covers | Typical range |
|---|---|
| Garage conversion to a studio or one bedroom | $100,000 to $200,000 |
| New detached ADU, 400 to 800 sq ft | $200,000 to $400,000 |
| UC Berkeley survey, Los Angeles County median, 2018 and 2019 projects | $100,000 overall. $90,000 garage. $180,000 detached. |
| Terner Center and Berkeley CCI, 2020 | $148,000 Los Angeles estimate. $167,000 statewide average. |
| Remodeling Cost vs. Value 2025, Los Angeles | $178,536 job cost |
| Electrical and plumbing, Angi Los Angeles, January 2026 | Electrical $2,600 to $7,800. plumbing $3,900 to $10,400. |
| City permit and plan check fees | Not priced here |
Maywood ADU questions, answered
Can I build an ADU in Maywood?
Yes. State law requires ministerial approval of a compliant ADU, and Maywood's Zoning Ordinance section 4070.120, added by Ordinance 24-02 in 2024, sets local criteria. The Housing Element calls the ADU the most common development type in the city. We could not read the ordinance scan, so confirm size, setbacks and parking with Planning before you draw.
How big can an ADU be in California?
State law protects an 800 square foot detached ADU with 4 foot side and rear setbacks, and a city cannot cap a detached unit below 850 square feet, or 1,000 with more than one bedroom. The statewide ceiling is 1,200 square feet detached. Maywood's Ordinance 24-02 sets local numbers that we could not read, so ask Planning which apply.
How much does it cost to build an ADU in California?
Plan on roughly $100,000 to $200,000 to convert a garage and $200,000 to $400,000 for a new detached unit of 400 to 800 square feet, per our sourced ranges. They draw on 2018 to 2020 surveys and a 2025 Los Angeles job cost, none for Maywood. Fees and utility connections are separate lines, and a written proposal after a site visit sets the figure.
Do I need to provide parking for my ADU?
It depends on the unit type, and Maywood's papers pull in two directions. State law bars replacement parking when a garage is converted and asks no more than one space per ADU or bedroom otherwise, with exemptions such as near transit. The Housing Element says the City keeps its parking requirements because residents drive pickup trucks. Get Planning's answer in writing.
Can I convert my unpermitted garage conversion into a legal ADU in Maywood?
Often yes. State law says a city cannot deny a permit for an unpermitted ADU built before January 1, 2020 over code violations unless correction is needed to fix a substandard, unsafe condition under Health and Safety Code 17920.3. Maywood's Housing Element says the City is bringing such units into compliance. Start with a records check and a site visit.
How long does it take to get an ADU permit?
The state clock is 15 business days for a completeness notice and 60 days to decide a complete application, with deemed approval if the City is silent, effective January 1, 2026. Maywood's Housing Element, written earlier, says an ADU permit generally takes about two months. Building plan check and construction come on top of that.
What is the difference between an ADU and a JADU?
An ADU is a complete unit with its own sleeping, cooking and sanitation, attached or detached, while a junior ADU is a unit of up to 500 square feet carved out of the existing house. A JADU needs an efficiency kitchen and a separate entry, and owner occupancy is required only if it shares a bathroom. Our ADU versus JADU guide compares the two.
Can I sell my ADU separately from my main house?
Generally no. State law bars a separate sale except to a qualified low-income buyer through a qualifying nonprofit, or where a city has adopted a condominium ordinance. We did not read a Maywood condominium ordinance for ADUs. Renting is allowed, and a city may require terms longer than 30 days.
Tell us about your Maywood ADU plans
Tell us whether you are weighing the garage or the back yard, how old the structure is and whether it has ever been permitted as living space, and the first visit will start there.