Building an ADU in Escondido

What you can build in Escondido

ADUs and junior ADUs (JADUs) are allowed on lots zoned for single-family or multifamily homes that have an existing or proposed home. Escondido's rules are in Article 70 of the Zoning Code. The City Council replaced Article 70 entirely with Ordinance 2026-13R, adopted July 29, 2026, to bring it in line with state law (Government Code 66310-66342). The ordinance took effect 30 days after it passed. The online Article 70 still showed the older text when we checked, so read the ordinance itself.

The ordinance sorts ADUs into two types:

• State Exempt ADUs are the kinds state law requires every city to approve. They get only the standards in state law, with no extra local design rules.
• Standard ADUs are allowed on top of those. They can be larger but must meet Escondido's design, landscaping and lot coverage rules.

Single-family lots. You can have one ADU inside the existing or proposed house or an existing accessory structure (such as a garage), one JADU, and one new detached ADU of up to 800 sq ft. You can also add one Standard ADU of up to 1,200 sq ft. More Standard ADUs may be possible with a separate development application under Article 61. To be called "detached," an ADU must sit at least 10 feet from the house.

Multifamily lots. You can convert non-living space such as storage rooms, attics, basements or garages in an existing apartment building into ADUs: at least one, and up to 25% of the existing units. You can also build up to eight detached ADUs (no more than the number of existing units) on a lot with an existing multifamily building, or two with a proposed one.

Look up your parcel number and zoning with the city's Parcel Look Up Tool before you start. Statewide rules are on our California page. [1][2][4]

Size, height and setbacks

Sizes are measured in interior livable space: rooms for living, sleeping, eating, cooking or sanitation.

Size. Every ADU and JADU must be at least 150 sq ft and meet the state's efficiency unit rules. A state-exempt detached ADU can be up to 800 sq ft. A Standard ADU can be up to 1,200 sq ft. A converted ADU can add up to 150 sq ft beyond an existing accessory structure, but only for getting in and out. In a Standard ADU, the bedrooms together can't take up more than half the livable space.

Height.

• An ADU or JADU inside existing space is limited to the height of the building it's in.
• An attached ADU can be as tall as the house or 25 feet, whichever is greater.
• A detached ADU next to a one-story house can be as tall as the house or 24 feet, whichever is greater. Next to a multistory house, it can be as tall as the house or the zone's height limit, whichever is greater. The same goes for an ADU built over a detached garage.
• Any ADU can add 2 feet for a roof pitch that matches the house.
• The part of an ADU over 18 feet is subject to an extra 5-foot setback from property lines next to residential zones. The code writes this rule for ADUs built above a garage or other accessory structure; confirm with Planning how it applies to your design.

Setbacks.

• Side and rear: 4 feet for new ADUs, attached or detached.
• Conversions: no new side or rear setback for existing space, or for a structure rebuilt in the same place and size.
• Front: no front setback for a Standard ADU under 800 sq ft. Standard ADUs from 800 to 1,200 sq ft must meet the zone's front setback.

Lot coverage. A Standard ADU under 800 sq ft doesn't count toward lot coverage. One from 800 to 1,200 sq ft must fit within the zone's lot coverage limit. State law bars lot coverage, front setback and similar rules from blocking an 800 sq ft ADU with 4-foot side and rear setbacks. [1][5]

Parking

The city's ADU page, written under the older ordinance, says "parking is not required for ADUs." Under the 2026 ordinance, junior ADUs never need parking, and the ordinance adds no parking rule for state-exempt ADUs. For a Standard ADU, the ordinance lists cases where no parking is required: within a half-mile walk of public transit, in a historic district, part of the house or an accessory structure, where on-street permits are required but not offered to the tenant, or within one block of a car share vehicle. It calls any parking you add for a Standard ADU "voluntary": one space is enough, and it can be tandem on your driveway or in a setback. If none of the listed cases fits your Standard ADU, confirm with Planning whether a space is needed.

If you tear down or convert a garage, carport or covered parking space for an ADU, or replace uncovered parking, you don't have to replace it. A demolition permit for a detached garage that an ADU will replace is reviewed with the ADU and issued at the same time. [1][2]

Fees

City impact fees. Escondido's Fee Guide for Development Projects (updated July 21, 2026) says ADUs built under Article 70 "shall be exempt from payment of wastewater, water, traffic, public facility, drainage, park, and other development impact fees." The 2026 ordinance separately bars impact fees on ADUs under 750 sq ft and requires proportional fees on larger ones; state law words the exemption as 750 sq ft or less.

Building permit fees. ADU fees are figured the same way as for a residential room addition. The plan check fee is 75% of the building permit fee, which is based on the project's valuation. Processing fees are paid when you submit for plan check, and the rest at permit issuance. You pay the fees in effect when the permit is issued.

School fees. You pay school fees directly to the school district before the permit is issued. For amounts, the fee guide sends you to the Escondido Union school districts' facilities department at (760) 432-2382. Under state law, ADUs and JADUs under 500 sq ft of interior livable space aren't subject to school impact fees.

Water and sewer. You don't have to install a separate utility connection for a state-exempt ADU, and if you choose to, no connection fee or capacity charge applies unless the ADU is built with a new house. A Standard ADU may need its own connection, with a charge proportional to its size or plumbing fixtures. If your house has fire sprinklers, the ADU needs them too, along with at least a 1-inch water meter and a 4-inch sewer lateral.

Out-of-date line. The same fee guide still says the owner "must reside on the parcel" with an ADU. The 2026 ordinance says owner occupancy "shall not be applied" to any ADU, and state law bans it. See our ADU cost guide for typical costs. [1][2][3][5]

How long it takes

ADU and JADU permits are approved ministerially, with no hearing. Under the 2026 ordinance, the city must tell you within 15 business days whether your application is complete, listing anything missing. With an existing home on the lot, it must approve or deny a complete application within 60 days, or the application is deemed approved. A denial must be in writing with a full list of what to fix. The clock pauses if you ask for a delay, and an ADU filed with a new house can wait for the house decision.

The Building Division says each plan review cycle takes about 30 calendar days once it has a complete set of plans. Pre-approved ADU applications also get a 30-day review per cycle, and approval can take a couple of months of back and forth. The city's PAADU guidebook estimates 1 to 4 months for permitting and 6 to 14 months for construction. See our ADU permit process guide. [1][6][7][8]

Design rules for Standard ADUs

State-exempt ADUs (the converted ADU and the detached ADU up to 800 sq ft) get no extra local design standards. Standard ADUs must:

• match the house's exterior materials, texture and colors, and substantially match its roof materials, color and pitch
• use windows from the same product line as the house, or match at least three listed features such as window type, frame material and glazing
• have a separate outside entrance and no inside door into the house, their own bathroom, and one kitchen ("wet bars" aren't allowed)
• landscape at least half of the remaining yard area with plants that can survive without permanent irrigation

JADUs have their own, shorter list: exterior materials, texture and colors that substantially match the house, and matching windows.

Historic lots. On a lot with a listed historic building or in a historic district, an ADU or JADU must meet the requirements for the historic structure or district. For homes in the Old Escondido Neighborhood, the city publishes an ADU style adaptation guide.

Septic. If the ADU will use a septic system, you need a certified percolation test from the last 5 years (10 if recertified), and for a Standard ADU, sign-off from the County of San Diego Department of Environmental Health and Quality. [1][9]

Garage conversions and junior ADUs

Garage conversions. You can turn an existing garage or other accessory structure into an ADU. It keeps its existing setbacks and can add up to 150 sq ft for getting in and out. You don't have to replace the parking. Your ADU needs fire sprinklers only if the house has them. More in our garage conversion guide.

Junior ADUs. One JADU is allowed per single-family lot, built within the walls of the existing or proposed house; an attached garage counts as part of the house. It can be 150 to 500 sq ft. It needs its own outside entrance and an efficiency kitchen with a cooking appliance, a food prep counter of at least 4 sq ft and at least 36 cubic feet of cabinets. It may share a bathroom with the house and may have an inside door to it. If it shares a bathroom, the owner must live in the house or the JADU, and you record a deed restriction before the permit is issued. See our junior ADU guide.

Unpermitted units. The city can't deny a permit for an unpermitted ADU or JADU built before January 1, 2020, unless it finds that correcting a violation is needed to meet the state's substandard-building standards. Such units don't pay impact fees or connection charges unless utility work is needed for safety. The ordinance suggests getting a confidential inspection from a licensed contractor before you apply. [1][2]

Renting it out or selling it

You don't have to live on the property to build or rent an ADU. ADUs and JADUs can be rented separately from the house, but only with a rental agreement and for terms longer than 30 days. The city's ADU page says Escondido doesn't permit short-term rentals.

Selling separately. The 2026 ordinance lets you split the house and ADU into condominiums and sell the ADU. The condos must follow the Davis-Stirling Act and the Subdivision Map Act, every lender must consent, and the ADU must pass a safety inspection before the condominium plan is recorded. In an existing HOA you need the association's written approval. ADUs built by a qualified nonprofit can also be sold to low- or moderate-income buyers. JADUs can never be sold separately. The city's PAADU FAQ, written before the 2026 ordinance, still says ADUs can't be sold separately, so confirm with Planning. [1][2][10]

Permit steps in Escondido

1. Research your lot

   Find your parcel number and zoning with the Parcel Look Up Tool, and read Ordinance 2026-13R. Call the Planning Division at 760-839-4671 with questions; for multifamily lots, contact Planning first. [1][2][11]

2. Choose a design

   Hire a designer, or download one of the city's free pre-approved ADU plans for a detached single-story ADU. [9]

3. Prepare your submittal

   Follow the ADU Handout and Submittal Checklist: site plan, floor plans, elevations, landscape plan if needed, the ADU Housing Development Tracking Form, grant deed, a preliminary title report from the last six months, site photos, the SDG&E notification form and the hazardous wastes disclosure statement. [2][11]

4. Apply online

   Apply through the Escondido Portal and upload each plan sheet to ProjectDox using the city's file naming rules. The ADU page also says to email buildingpermits@escondido.gov first. [2][6][7]

5. Go through plan review

   Staff check your application for completeness, then review it in cycles of about 30 days. Watch ProjectDox and your email for comments and resubmit corrections. [2][6][7]

6. Pay fees and get the permit

   Pay school fees to the school district first, then the remaining city fees. For a JADU that shares a bathroom, record the owner-occupancy deed restriction before issuance. [1][3][7]

7. Build and pass inspections

   Request inspections through the City Portal; the Building Division no longer schedules them by phone. The ADU gets a certificate of occupancy only after the main house has one. [1][6]

Pre-approved and sample plans

• Pre-Approved ADU Program (PAADU)

  Four free single-story detached ADU plans (484, 644, 851 and 1,000 sq ft) that you download and submit with a building permit application. [9][10]

Who to call

• City of Escondido Planning Division

  ADU zoning rules, multifamily ADUs and pre-approved plan questions (planning@escondido.gov)

  760-839-4671

  201 North Broadway, Escondido, CA 92025

  [2][12]

• City of Escondido Building Division

  Building permits, plan review and inspections (buildingpermits@escondido.gov)

  760-839-4647

  City Hall, First Floor, 201 North Broadway, Escondido, CA 92025

  [2][3][6]

Questions people ask