Everything homeowners need to know about building an accessory dwelling unit in Palmdale - size limits, setbacks, permits, and where the city's own ordinance still needs to catch up with California's statewide ADU law.
Last verified: August 2026
6/10 · ADU-friendly, with caveats
850-1,000 sq ft*
Max ADU size
16 ft*
Max height
Not required
Owner-occupancy
By-right
Permit type
This page summarizes Palmdale Municipal Code Section 17.91.010 (Accessory Dwelling Units) and California's statewide ADU law (Government Code, State ADU Law, Sections 66310-66342) for general reference - it is not legal advice. Palmdale's local ordinance is currently under state review and subject to further amendment (see ordinance history below). Always confirm current requirements with Palmdale's Planning Division before designing or applying for permits. See sources below.
Zoning & size requirements
What you're allowed to build
ADU type
Max size
Max height
Notes
Detached (new build or garage conversion)
850 sq ft for a studio or 1-bedroom unit; 1,000 sq ft for a 2-bedroom (or larger) unit
16 ft generally (some two-story designs allowed up to 25 ft in qualifying zones)
Sized by bedroom count under PMC 17.91.010(D). A separate 800 sq ft cap applies to detached ADUs on multifamily lots, though the state has ordered the city to remove it - see ordinance history
Same 850 / 1,000 sq ft caps by bedroom count, or 50% of the primary dwelling's floor area, whichever is smaller
Matches the primary structure
Common approach for above-garage or interior conversions
Junior ADU (JADU)
500 sq ft
Same as primary structure
Must be built within the existing walls of a single-family home; not permitted on multifamily lots
Allowed zoning districts
Any zone where single-family or multifamily residential use is permitted, citywide, under PMC Chapter 17.91 (Residential Uses). Confirm your parcel's zone with Palmdale's Planning Division before you design.
Additional standards
Setbacks, parking & other rules
Setbacks
4 ft from rear and side property lines, corrected in 2021 after the state found the city was improperly applying street-side-yard setbacks; front setback generally follows the underlying zone
Parking
1 space per ADU unless the project qualifies for a state-law exemption (transit proximity, conversion of existing space, or another listed exemption); no replacement required for demolished covered parking
Units per lot
The municipal code caps single-family lots at 1 ADU + 1 JADU. HCD's February 2026 findings letter concluded this cap is more restrictive than state law's combination-of-categories requirement and ordered the city to revise it
Owner-occupancy
Not required for ADUs, permanently eliminated statewide by AB 976 effective January 1, 2024. However, as of HCD's February 2026 review, Palmdale's code still required a recorded covenant before issuing any ADU permit - a requirement state law prohibits for standard ADUs - and the city has been ordered to remove it
Building code
Must meet the California Residential Code as locally adopted by Palmdale
Rental rules
No separate ADU-specific rental license was found in the municipal code; standard California landlord-tenant law applies
Ordinance history
How Palmdale's ADU rules got here
2020Local ordinance adopted. Following statewide AB 68 and AB 881, the City Council adopts Ordinance No. 1539 on April 7, amending PMC 17.91.010 to align with the new state framework.
2021HCD finds multiple compliance gaps. A June 29 findings letter identifies several problems: an "existing structure" definition limited to buildings at least two years old, an overbroad street-side setback requirement, missing "where feasible" flexibility language, a JADU septic-connection rule that exceeded state authority, and a ban on second-floor ADUs lacking exterior stairways. The city is asked to respond by July 30.
2024Owner-occupancy ban made permanent. AB 976, effective January 1, permanently prohibits California cities from requiring owner-occupancy for ADUs.
2025State flags an outdated ordinance. A December 5 HCD technical assistance letter notes the most recent ordinance on file for Palmdale is still the 2020 version, and that numerous state law changes since then may have left it out of compliance.
2026A new, more detailed findings letter arrives. On February 11, HCD issues formal written findings identifying several unresolved compliance problems: outdated statutory citations following a 2024 renumbering, an unlawfully narrow one-ADU-per-lot cap, the 800 sq ft multifamily-lot size restriction, the prohibited deed-restriction requirement, missing fire-sprinkler language, and an outdated JADU owner-occupancy rule. The city has until March 10 to respond with a plan to amend the ordinance or formally defend it.
Worth knowing: this is the second full HCD compliance review cycle for Palmdale's ADU ordinance in five years. The city addressed its 2021 findings, but HCD's 2026 review turned up a new and larger set of issues, including a deed-restriction requirement that state law prohibits for standard ADUs. In the meantime, California law is clear that a noncompliant local ordinance doesn't block homeowners - applications are still processed under state ADU law regardless of what the local code says, so a well-prepared project shouldn't be held up while the city's rewrite plays out. Confirm the ordinance's current status with Planning before you finalize plans.
Permit process
How Palmdale ADU permitting works
1
Pre-application discussion
Talk through your project with the Planning Division at (661) 267-5200 or planningdiv@cityofpalmdaleca.gov before you design.
2
Choose a plan path
Consider the city's free Standard ADU Plans (three conceptual designs at roughly 608, 749, and 1,000-1,106 sq ft) or a fully custom design.
3
Prepare your plan set
Standard plans are conceptual only, not construction-ready - you'll still need a licensed designer to produce architectural plans, structural calculations, and Title 24 energy compliance documents.
4
Apply for Zoning Clearance Review
Create an account on the city's Accela citizen portal and submit for Planning Division zoning clearance before proceeding to Building & Safety.
5
Plan review
State law requires a decision within 60 days of a complete application.
6
Permit, build, inspect
Pull your building permit, begin construction, and schedule framing, plumbing, electrical, and final inspections.
Palmdale's itemized ADU fee schedule wasn't available in the city materials reviewed for this page - request a current estimate from Building & Safety at (661) 267-5353 or BuildingAdmin@cityofpalmdaleca.gov. Fees and timelines are approximate and change - confirm before budgeting.
Budgeting
What it costs to build an ADU in Palmdale
Garage conversion
Roughly $60,000-$170,000, the least expensive path since the shell already exists
Basement conversion
Uncommon in Palmdale's largely slab-on-grade, high-desert housing stock; where feasible, costs typically run comparable to or higher than a garage conversion
New detached ADU
Roughly $130,000-$310,000+ for a code-compliant, fully insulated freestanding unit
Permit & plan-check fees
Not published in the city materials reviewed here; broader LA County-area ADU permit and plan-check fees commonly run $5,000-$15,000 - confirm your project's exact fees with Building & Safety
Impact fees
Waived entirely for ADUs under 750 sq ft under state law
These are general ranges from local contractor estimates and regional reporting, not quotes - actual cost depends heavily on lot conditions, finishes, and whether utilities need to be extended. Antelope Valley's temperature swings push insulation and HVAC costs above what a bare garage shell alone would suggest.
Before you apply
Tips for a smooth approval
Confirm your zone with Planning before you design. A short pre-application conversation avoids redesigning a project that doesn't fit your lot.
Size by bedroom count. Palmdale caps a detached ADU at 850 sq ft for a studio or 1-bedroom and 1,000 sq ft for 2+ bedrooms.
Ask what's actually current before you finalize plans. HCD's February 2026 findings ordered the city to drop its deed-restriction requirement and its one-ADU-per-lot cap - confirm with Planning which parts of the code have already changed.
Consider a Standard ADU Plan. The city's three free conceptual designs can save on early architectural costs, though you'll still need a licensed designer for construction documents.
Get a written fee estimate early. Palmdale's fee schedule isn't itemized in public materials, so ask Building & Safety for a project-specific number before you budget.
FAQ
Common questions
Do I need to live on the property to build an ADU in Palmdale?
No. California's AB 976 permanently eliminated owner-occupancy requirements for ADUs statewide as of January 1, 2024. However, HCD's February 2026 review found Palmdale's code still required a recorded deed restriction before issuing an ADU permit, which state law prohibits - the city has been ordered to remove it, so confirm current practice with Planning.
How many ADUs can I build on one lot?
The municipal code currently states 1 ADU plus 1 JADU on a single-family lot, but HCD's February 2026 findings concluded this cap is narrower than what state law requires. Confirm the current interpretation with Planning, since state ADU law still applies regardless of what the local code says.
Do I need extra parking for an ADU?
Usually one space, unless your project qualifies for an exemption, such as being within a half-mile of transit or converting existing space. A demolished garage space doesn't need to be replaced.
How long does the permit process take?
State law requires a ministerial decision within 60 days of a complete application. Most homeowners should plan for a few months from project start to permit issuance once design and zoning clearance are factored in.
What's the maximum size for a detached ADU in Palmdale?
850 sq ft for a studio or 1-bedroom unit, or 1,000 sq ft for a 2-bedroom or larger unit, with a height limit generally around 16 ft. A separate 800 sq ft cap applies to detached ADUs on multifamily lots, though the state has ordered the city to remove that restriction.
How much does an ADU cost to build in Palmdale?
Garage conversions tend to run roughly $60,000-$170,000, and new detached units roughly $130,000-$310,000 or more, based on local contractor estimates and regional reporting. The city's itemized permit fee schedule wasn't available in materials reviewed for this page - confirm with Building & Safety.
Is Palmdale's ADU ordinance fully compliant with state law?
Not as of HCD's most recent review. A February 2026 findings letter identified several unresolved compliance issues, including a prohibited deed-restriction requirement and an unlawfully narrow unit cap, following an earlier round of findings in 2021. The city had until March 10, 2026 to respond. In the meantime, applications are processed under state ADU law regardless, so this shouldn't hold up a homeowner's project - just confirm current requirements with Planning.
Does Palmdale offer pre-approved ADU plans?
Yes. The city's Standard ADU Plans program offers three free conceptual designs, roughly 608, 749, and 1,000-1,106 sq ft, in multiple architectural styles. They aren't construction-ready, so you'll still need a licensed designer to finalize architectural and structural documents.
