ADU Constructionin West Covina, CA
ADU construction in West Covina starts with a notarized Second Unit Review application to Planning, which answers within 30 days with an Approval Letter or an Incomplete letter. That letter is not a construction permit: plans then go to Building for plan check. The City's May 2025 guidelines cap a detached ADU at 1,200 square feet.
West Covina was built to be spacious. George Meeker's Sunkist Village of 1941 sold affordable houses on large lots, and the 1950s tracts that followed filled the old walnut and orange groves. The Census Bureau's 2024 estimates count 64.4 percent of the city's homes as single-family detached, so a lot with room behind the house is the normal starting point for an ADU.
This page covers what is particular to West Covina: the City's two-step approval, the size and setback numbers in its guidelines, the garage-conversion questions, what the State's housing department told the City about its ordinance, and the hilly south side. Cost ranges, the state law table and the phase timeline are on our ADU construction page.
West Covina Planning and Building rules that apply to an ADU
Where adu construction permits come from in West Covina: City of West Covina Community Development Department, Building Division.
- The Planning Division reviews an ADU or JADU Second Unit Review application within 30 days of official submittal and issues an Incomplete letter or an Approval Letter; the approval is not a construction permit and only allows submittal to Building or Engineering for plan check. The application must be notarized by the owner, a lot can have one ADU and one JADU, and neither may have a second address or separate utilities. The page cites Ordinance No. 2480 (April 20, 2021).
- The City's ADU/JADU Guidelines (updated 05/2025): a new attached ADU up to 1,000 sq. ft. or 50 percent of the existing home (1,200 sq. ft. maximum), a new detached ADU up to 1,200 sq. ft., 4-foot side and rear setbacks and a 25-foot front setback, 10 feet between a new ADU and other structures, a 16-foot height limit, a separate entrance, matching exterior materials, colors and roof pitch, no rental for 30 days or less, a JADU up to 500 sq. ft. with owner occupancy, and a garage-conversion driveway no wider than 20 feet.
- In the Development Code, ADU applications are approved ministerially, one 10 x 20 ft parking space is required unless the unit is a studio, no space is required within a half mile walking distance of public transit, units near a major transit stop can reach 18 feet, and the owner must record a covenant before the permit is issued.
- The AB 2533 path for an ADU or JADU built before January 1, 2020 without a permit requires a Substandard Housing Inspection Checklist signed by a licensed general contractor (B), architect or engineer, proof of pre-2020 construction (assessor record, escrow documents, prior City records or a transfer disclosure), a covenant recorded through Planning, the application fee, and plans and photos.
- Urban lot splits and Urban Dwelling Units (SB 9) are allowed only on R-1 zoned lots under Urgency Ordinance No. 2493 (December 7, 2021), with no more than two units per lot and a 30-day completeness review, and residents of those units do not qualify for on-street parking permits where such permits are required.
- The City's pre-approved ADU plan page says its list of pre-approved plans will be posted soon and gives the steps to use one: buy the plan from the listed designer, prepare a site plan, complete a Second Unit Review application and submit plans, application and fees.
How do you build an ADU in West Covina? Planning first, then plan check
West Covina runs an ADU through two desks. First, the owner files a Second Unit Review application with Planning, notarized by the owner. Within 30 days of the official submittal, Planning sends either an Incomplete letter or an Approval Letter. The City's page is blunt that the Approval Letter is not a construction permit: it only lets you submit plans to Building or Engineering for plan check. A lot can have one ADU and one junior ADU, and neither may have a second address or separate utilities.
Second, the plans go through the Building Division at City Hall, online through the One Stop Building Permit Center portal. Digital review is the only option, and the Fire Prevention Bureau checks the same set against the 2025 California Fire Code and Building Code. Work started before a permit is issued can draw a stop-work notice and a non-compliance fee.
The City's ADU page also offers a separate application for pre-approved detached designs, with its own fee for each design. At last read, the list of pre-approved plans itself was marked as coming soon.
How big can an ADU be in West Covina, and how close to the fence?
The City's ADU and JADU guidelines, updated in May 2025, set a new detached ADU at up to 1,200 square feet and a new attached ADU at up to 1,000 square feet or 50 percent of the existing house, with 1,200 as the ceiling. A junior ADU is capped at 500 square feet. New construction keeps 4 feet from the side and rear lines, 25 feet from the front line, and 10 feet from other structures, and the height limit is 16 feet.
Appearance rules come with it: a separate entrance, plus exterior materials, colors and roof pitch that match the house. The Development Code adds that units near a major transit stop can reach 18 feet. Those are City standards, and state law sets floors under them: a city cannot cap a detached ADU below 850 square feet, or 1,000 square feet with more than one bedroom, and it must still allow an 800 square foot unit with 4-foot setbacks.
If a guideline in the City's handout looks stricter than what state law protects, we ask Planning to confirm in writing which one applies to your lot before drawing. The State's rules for each unit type are in our ADU vs JADU guide.
Garage conversion ADU in West Covina: parking, driveway and the garage-retention rule
A garage conversion is the lowest-cost way to a unit, and it is also where West Covina's rules pull in two directions. The City's FAQ names unpermitted garage conversions as a common code enforcement violation, and its 2024 Development Code update added standards meant to retain garages. The ADU guidelines, meanwhile, allow a converted garage with a driveway no wider than 20 feet.
Parking is the open question. The Development Code, as we read it, asks for one 10 by 20 foot space unless the unit is a studio, and none within a half mile walking distance of public transit. State law, read on the Legislature's site, says a city cannot require replacement parking when a garage is converted. Ask Planning how the two fit together for your address before you design around a driveway.
Existing structures are different from new ones in another way: state law requires no setbacks for a living area or accessory structure converted in place, which is how a garage sitting close to the lot line can still become a unit. The step by step is in our garage conversion permit guide, written for Los Angeles but useful as a checklist of what to ask any counter.
Does West Covina's ADU ordinance follow state law? What HCD's 2022 letter found
On February 11, 2022, the California Department of Housing and Community Development wrote to the City about Ordinance No. 2480, adopted April 20, 2021. HCD found five provisions that did not comply with state law: setbacks required on converted structures, a size cap that applied to the combined area of detached units on multifamily lots, a siting rule that kept detached ADUs behind the back of the house, a flat ban on separate sale, and a rule that barred exterior stairs between the property line and the house.
We did not find the City's reply, and the City's May 2025 guidelines may already reflect changes. We also could not read the City's three ordinances from 2019 and 2020 that amend its building, electrical and fire codes, because they are scanned images. So the practical advice is simple: when a City handout and the State statute disagree, the statute wins, and a request to Planning in writing, with the section number, is the way to settle it.
State rules also changed on January 1, 2026: a city now has 15 business days to say whether an ADU application is complete and 60 days after that to decide. The City's page still speaks of a 30-day review, so ask which clock Planning is working to.
ADU on a hillside lot: the Hillside Overlay, fire hazard points and the BKK landfill
Only West Covina has this combination. The San Jose Hills are a mapped Hillside Overlay where slopes over 45 percent stay ungraded, grading on slopes over 35 percent is kept minimal and density is capped at one dwelling unit per gross acre. We could not find how the City counts an ADU against that cap, so ask Planning in writing; state law limits what a city can enforce against an ADU.
Fire is the second layer. In the Los Angeles County copy of CAL FIRE's map layer, a grid of 116 points inside the city returned 9 High and 1 Very High, clustered in the hilly south and southeast. It is a sample, not a parcel map, so check your address on the CAL FIRE viewer and read the City's fire hazard page before promising a client a unit.
The former BKK landfill also lies in the south of the city. We found no City rule for building near it, so a lot nearby gets a direct question to the Building Division. The same county layer flagged liquefaction at 14 of the 116 points and an earthquake-induced landslide zone at 5, so a soils report may be part of the plan set.
Utilities, trees and the covenant: site work for a West Covina ADU
The City's page says an ADU cannot have separate utilities from the main house, which affects how the electrical panel, gas, water and sewer are planned. We have no West Covina source on panel upgrades or sewer lateral capacity, so we ask the Building and Engineering counters, and the utilities, before pricing a trench. Digging the line to a backyard unit is often the item that surprises people.
Trees are the other site issue. A tree permit is needed for a front or street-side tree with a caliper of 1 foot or more, and for any tree 6 inches or larger that is an oak, a California or American sycamore or a Southern California black walnut. The City's form lists $271.58 for one tree and $21.30 for each additional one.
Under the Development Code, the owner records a covenant before the permit is issued. We list it on the schedule next to Planning approval, so recording does not become the last item on a long checklist. MDG Builders, CSLB #1040337, manages those steps, and licensed specialty subcontractors do the trenching, framing, plumbing and electrical; ask for each one's license and insurance certificate.
ADU fees, rentals and unpermitted units in West Covina
State law exempts an ADU of 750 square feet or less from impact fees, with larger units charged in proportion to the main house, but utility connection charges are separate. A rental must run longer than 30 days, and the City's guidelines bar rentals of 30 days or less. For a junior ADU, the City's May 2025 guidelines call for owner occupancy, while state law changed on January 1, 2026 to require it only when the JADU shares a bathroom. Ask Planning which applies.
An unpermitted unit built before 2020 has its own path. The City's AB 2533 page asks for an inspection checklist signed by a licensed general contractor, architect or engineer, proof the unit predates 2020, a recorded covenant and plans and photos. Urban lot splits and urban dwelling units under SB 9 are allowed on R-1 lots only, under the City's 2021 urgency ordinance, and residents of those units do not qualify for on-street parking permits.
With 21.6 percent of homes in buildings of five or more units, many owners also ask about adding units to a multifamily lot. State law allows several detached ADUs there; ask Planning how it applies to your lot, since the HCD letter flagged the City's rule on that point. Our ADU cost guide covers what to budget.
ADU photos from West Covina and nearby homes
Six ADU scenes tied to West Covina neighborhoods and nearby communities, from slab and framing to finished interiors. Tap a photo to enlarge it.
What adu construction costs around West Covina
Our ADU construction page puts a garage conversion to a studio or one-bedroom at about $100,000 to $200,000 and a new detached ADU of 400 to 800 square feet at about $200,000 to $400,000. The ranges rest on a 2021 UC Berkeley survey (a Los Angeles County median of $100,000 for 2018 and 2019 projects), the 2025 Cost vs. Value report for Los Angeles ($178,536 for its reference ADU, 39.9 percent recouped), and builder quotes, and costs have risen since the survey. We found no West Covina price study and no confirmed City fee amounts for an ADU, so your written proposal sets the real figure. The same lot may need a West Covina bathroom remodel, a West Covina room addition or new West Covina windows. Compare the rules in Pomona, Glendale, Pasadena and Los Angeles, or choose between a unit and an addition with our room addition vs ADU guide.
| 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 |
Other work we manage in West Covina
West Covina ADU questions, answered
How do I build an ADU in West Covina, step by step?
File a notarized Second Unit Review application with Planning, wait for the Approval Letter, then submit plans to the Building Division for plan check through the One Stop portal. The letter is not a construction permit. After permits, the work is inspected, and the owner records a covenant before the permit is issued, as the Development Code requires.
How long does it take to get an ADU permit?
Planning's Second Unit Review answers within 30 days of the official submittal, per the City's page, and plan check follows separately. State law since January 1, 2026 gives an agency 15 business days to call an application complete and 60 days after that to decide. We found no published West Covina plan check times, so ask the counter for a current estimate.
What is the largest ADU I can build in West Covina?
A detached ADU can reach 1,200 square feet under state law, and West Covina's May 2025 guidelines match that. An attached ADU is limited to 1,000 square feet or 50 percent of the house, with 1,200 as the maximum. A city cannot set a cap below 850 square feet, or 1,000 with more than one bedroom, for a detached unit.
Does a West Covina ADU need its own parking space?
Often not. State law bars replacement parking when a garage or carport is converted, and no parking is required within a half mile walking distance of public transit. The City's Development Code, as we read it, asks for one 10 by 20 foot space unless the unit is a studio. Ask Planning how that applies to your address.
Can I convert my garage into an ADU in West Covina?
Yes, it needs a Second Unit Review and a building permit. The City's guidelines allow a garage conversion with a driveway no wider than 20 feet, and its FAQ names unpermitted garage conversions as a common violation. A converted structure needs no new setbacks under state law. Ask Planning about the garage-retention standards added in 2024.
Do I need to live on the property to rent out an ADU?
No, for a full ADU. State law does not allow owner-occupancy requirements for ADUs, though a city may require rentals longer than 30 days. A junior ADU is different: West Covina's May 2025 guidelines require owner occupancy, while state law since January 2026 requires it only if the unit shares a bathroom. Confirm with Planning.
How much does it cost to build an ADU in Los Angeles County?
A garage conversion runs about $100,000 to $200,000 and a new detached ADU of 400 to 800 square feet about $200,000 to $400,000, drawn from a 2021 UC Berkeley survey, Remodeling magazine's 2025 Cost vs. Value report and builder quotes. We found no West Covina price study, so a written proposal after a site visit sets the real number.
Can I sell my ADU separately from the main house?
Generally no. State law bars separate sale of an ADU except through a qualified nonprofit sale to a low-income buyer or under a city condominium ordinance. HCD told West Covina in 2022 that its flat ban needed to reflect that nonprofit exception. Ask Planning whether the City has since added it, and check with a real estate attorney.
Tell us about your West Covina ADU
Send the street, the lot size, whether you are converting a garage or building new and whether the lot is on the hilly south side, and we will plan the visit from that.