Bolthole Index

Los Angeles County, California

Zoning, building permits and septic rules in Glendora, California

The City of Glendora, in Los Angeles County, California, adopts its own zoning through Title 21 of its municipal code1, and its Building Division is the city's contact point for building permits2. Los Angeles County's unincorporated-area rules do not apply inside city limits. We could not confirm who issues septic permits inside Glendora, so call the city Building Division and the county Environmental Health program before you plan a septic system3.

At a glance

Zoning
City zoning (Title 21): R-1, E-3 to E-7 and RHR single-family zones1
Building permit
Handled through the city's Building Division2
Hillside lots
Structures stay 50 feet from a ridge line; lot coverage falls as slope rises45
Accessory dwelling unit
Permitted use in single-family zones6
Septic
Not confirmed inside city limits; ask the city and county Environmental Health3
Wells
County Environmental Health reviews wells in Los Angeles County, except Long Beach, Pasadena and Vernon7
RV living
Not confirmed for Glendora; state rule limits RVs to parks unless a local ordinance allows more8

Who to call

Building permits

City of Glendora Building Division

Building permit and inspection process inside Glendora city limits

(626) 914-8222

116 E. Foothill Blvd. Glendora, CA 91741

Online permits →

Zoning

City of Glendora Planning Division

Zoning and land use questions, accessory dwelling units and SB 9 applications inside Glendora

(626) 914-8214

116 East Foothill Boulevard, Glendora, California 91741

Septic permits

LA County Department of Public Health, Environmental Health – Onsite Wastewater Treatment Program

Septic plan review for unincorporated Los Angeles County; ask whether it covers a Glendora address

(626) 430-5380

5050 Commerce Drive, Baldwin Park, CA 91706

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Glendora means bringing your own water and power. The kit we’d start with:

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Does Glendora, CA have zoning, and what does it mean for lots, ADUs and setbacks?

Yes. Glendora, California has its own zoning ordinance, Title 21 of the city code, which covers all land inside city limits1. Single-family zones are R-1, E-3 through E-7 and RHR (rural hillside residential); multiple-family zones are R-2, R-3, GA and LGA9. Which zone a parcel sits in comes from the city zoning map, so ask the Planning Division before you buy10.

Accessory dwelling units and SB 9 units are listed as permitted uses in the single-family zones6. A detached accessory building in those zones sits at least 4 feet from side and rear property lines11, is limited to 16 feet and one story12, and is capped at 1,200 square feet12.

Minimum lot size and minimum home size are set in a table in the city's zoning code appendix, which we could not confirm; the Planning Division can give the numbers for a specific zone10.

What are the hillside rules in Glendora?

Parcels with an average slope of 10 percent or more fall under Glendora's hillside standards, and a development plan comes first4. No structure may sit within 50 horizontal feet of a ridge line4.

Maximum lot coverage, which counts all impervious surface, drops as the slope rises: 25 percent for average slopes of 10% to under 25%, 20 percent for 25% to under 35%, 15 percent for 35% to under 40%, 10 percent for 40% to under 45%, and 5 percent at 45% or steeper5. Grading is prohibited where natural slopes exceed 35 percent5.

On RHR parcels, up to two detached accessory structures totaling no more than 1,000 square feet are permitted, each at least 6 feet from the main residence13.

Do you need a building permit in Glendora, and who issues it?

Inside Glendora city limits, building permits run through the city's own Building Division, not Los Angeles County Public Works2. The division describes itself as the contact point for the permit and inspection process, which may involve other departments and agencies depending on the project2. Call (626) 914-8222 or use the city's plan review and permit portal2.

We could not confirm the city's building code adoption, inspection rules or owner-builder procedure from the code text, so ask the Building Division what your project needs. California's owner-builder exemption from contractor licensing is statewide, but owner-builders remain responsible for obtaining building permits and passing inspections14. The 2025 California Building Standards Code applies to permit applications on or after January 1, 202615.

How do septic permits work inside Glendora?

We could not confirm who issues septic permits inside Glendora city limits. The Los Angeles County Department of Public Health reviews septic plans for unincorporated areas and contracted cities16, and plan approval is required before any septic work in the unincorporated area17. Whether Glendora is one of the contracted cities, we did not confirm, so ask the county's Onsite Wastewater Treatment Program at (626) 430-53803.

In the city, connecting to a public sewer requires a permit from the city engineer18. Septic is probably the exception on a city lot, but check with both offices before you count on it.

USDA rates only 6.6% of soils in Los Angeles County as not limited for a conventional drain field19, so expect a site evaluation and possibly an engineered system if septic is allowed.

Can you live in an RV or tiny home on your land in Glendora?

We could not confirm Glendora's own rule on living in an RV or tiny home. California's statewide rule is that RVs are not intended as permanent dwellings, and unless a local ordinance allows otherwise, RV occupancy is generally limited to mobilehome parks or special occupancy parks8. Los Angeles County's rule that bars living in an RV on a property applies to unincorporated land, not inside Glendora20.

A permitted accessory dwelling unit is the route the city's code names for a second home on a single-family lot6. Ask the Planning Division about RVs and tiny homes before you buy10.

Building a home in Glendora: the steps, in order

  1. Ask the Planning Division which zone the parcel is in and what the city's zoning code allows there10.
  2. If the lot slopes 10 percent or more, plan for a development plan, the ridge-line setback and the lot coverage limits4.
  3. Ask the Building Division what permits and plan review the project needs, and apply through the city's portal2.
  4. Confirm sewer or septic with the city engineer and the county Onsite Wastewater Treatment Program183.
  5. If the lot is divided, Title 20 of the city code governs the land division21.
  6. Schedule inspections through the Building Division, which aims for next-day inspections2.

What stays with Los Angeles County, and what to check before you buy in Glendora

Land outside Glendora city limits is a different case: unincorporated Los Angeles County follows county rules, covered on the Los Angeles County page. Wells are the clearest county matter: the county's Environmental Health Drinking Water Program reviews and approves wells in Los Angeles County except in Long Beach, Pasadena and Vernon7.

County-level numbers give context: Los Angeles County's typical home value is about $888,00022, its effective property tax rate is 0.7%23, and the median property tax bill is $5,438 a year24. Confirm the zone, slope and sewer status of any Glendora parcel with the city before you make an offer.

Watch-outs

  • Building permits and zoning inside Glendora come from the city, so do not use Los Angeles County's unincorporated-area Public Works or Regional Planning counters for a Glendora address210.
  • We could not confirm septic permitting, RV or tiny-home occupancy, minimum lot size or minimum home size inside Glendora; ask the Planning and Building Divisions and the county Onsite Wastewater Treatment Program103.
  • Hillside parcels face a 50-foot ridge-line setback and lot coverage as low as 5 percent on steep slopes45.

Sources

  1. City of Glendora, CA Code of Ordinances table of contents (eCode360) (Glendora), quoted and re-checked
  2. City of Glendora Building Division (cityofglendora.gov)
  3. LA County Department of Public Health, Environmental Health – Onsite Wastewater Treatment Program (admin.publichealth.lacounty.gov)
  4. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  5. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  6. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  7. State Small Water Systems and Wells, quoted and re-checked
  8. hcd.ca.gov (California statewide rule), quoted and re-checked
  9. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  10. City of Glendora Planning Division (cityofglendora.gov)
  11. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  12. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  13. Chapter 21.04 Residential Zones, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  14. Building Officials - Owner-Builder Overview, quoted and re-checked
  15. Approved Building Standards (California statewide rule), quoted and re-checked
  16. Local Agency Management Program (LAMP), quoted and re-checked
  17. admin.publichealth.lacounty.gov, quoted and re-checked
  18. Chapter 15.12 Permits, City of Glendora Code of Ordinances (eCode360) (Glendora), quoted and re-checked
  19. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  20. Common Zoning Violations - LA County Planning, quoted and re-checked
  21. City of Glendora, CA Code of Ordinances table of contents (eCode360) (Glendora), quoted and re-checked
  22. Typical home value (Zillow): Bolthole Index county data
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data

Written October 24, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Glendora

Glendora’s own rules

  • Local zoningPresent (with conditions)

    All land inside Glendora city limits; the city's own zoning ordinance (Title 21, Zoning) governs single-family, multiple-family and hillside zones.

    • Development in each zone is subject to the zone standards in Chapter 21.04 and, for dimensional limits, to Table A in the Title 21 appendix (not opened).
    • Chapter 21.04 history lists amendments by Ord. 2081, Ord. 2085 and Ord. 2095 (11/12/2025).
    “the single-family residence zones are: 1. r-1 (single-family residential); 2. e-3, e-4, e-5, e-6 and e-7 (single-family estate); 3. rhr (rural hillside residential).”
  • Zoning districtsPublished (with conditions)

    Zone classes inside Glendora city; the parcel-level zoning map was not opened.

    • Single-family zones: R-1, E-3 through E-7, and RHR.
    • Multiple-family zones: R-2, R-3, GA and LGA.
    • Single-family uses in multiple-family zones follow the R-1 development standards.
    • The zoning map (not opened) determines which zone a given parcel is in.
    “the multiple-family residence zones are: 1. r-2 (restricted multiple-family residence); 2. r-3 (multiple-family residence); 3. ga (garden apartments); 4. lga (limited garden apartments).”
  • SetbacksSpecified

    Hillside development on parcels with an average slope of ten percent or greater inside Glendora city.

    • Applies to parcels with average slope of ten percent or greater; a development plan is required first (Section 21.04.030(b)).

    minimum distance from ridge line (structures): >= 50 feet (horizontal)

    “no structure shall be located within fifty horizontal feet of a ridge line.”
    2 more reviewed findings on this topic
  • Lot coverageSpecified

    Parcels inside Glendora city with an average slope of ten percent or greater (hillside development under Section 21.04.030).

    • Lot coverage includes all impervious surface on the lot, except listed exceptions: streets serving other properties, fire department turnarounds, utility structures in easements, approved driveways leading to a two-car garage, paved walkways up to three feet wide on flat pads, retaining walls, and pool or spa water surface (pool decking is not excepted).
    • Grading is prohibited where natural slopes exceed 35 percent.
    • Accessory buildings are otherwise subject to the floor area ratio or lot coverage standards of the underlying zone (Table A, not opened).

    maximum lot coverage, average slope 10% to less than 25%: 25 percent · maximum lot coverage, average slope 25% to less than 35%: 20 percent · maximum lot coverage, average slope 35% to less than 40%: 15 percent · maximum lot coverage, average slope 40% to less than 45%: 10 percent · maximum lot coverage, average slope 45% or greater: 5 percent

    “the maximum lot coverage on any parcel shall be as follows: average slope maximum lot coverage 10%—less than 25% 25% 25%—less than 35% 20% 35%—less than 40% 15% 40%—less than 45% 10% 45% or greater 5%”
  • Building heightSpecified

    Accessory buildings in the single-family zones (R-1, E-3 through E-7, RHR) inside Glendora city. Main-house height is not covered by this claim.

    • Maximum height is one story.
    • Maximum floor area for a detached accessory building is 1,200 square feet.
    • Accessory buildings over 250 square feet must match the primary dwelling or meet the city's objective design standards.

    maximum height, accessory building: <= 16 feet · maximum floor area, accessory building: <= 1200 square feet

    “the maximum height shall be 16 feet, but not exceeding one story.”
  • Accessory dwellingsAllowed

    Accessory dwelling units on single-family lots in the R-1, E-3 through E-7 and RHR zones inside Glendora city.

    • ADUs are listed as a permitted use alongside the single-family residence and accessory buildings, as provided in the chapter or under state law.
    • Detailed ADU standards are in Section 21.04.040, which was not opened.
    • Guest houses are limited to one bedroom and a three-quarter bathroom, with no kitchen facilities, and must meet accessory-building standards.
    • Multiple-family zones apply R-1 standards to single-family uses.
    “single family residences, accessory dwelling units, sb 9 units, and accessory buildings.”
  • Mandatory utility hookupConditional

    Connections to the public sewer inside Glendora city.

    • Any connection to a public or house connection sewer requires a permit from the city engineer; the opened text does not state a mandatory-connection rule or distance.
    • Water connection requirements (Title 14, Water) were not opened.
    “it is unlawful for any person other than the city engineer to commence or make any connection with any public or house connection sewer”
  • Subdividing landRegulated (with conditions)

    Land divisions inside Glendora city.

    • Title 20 (Subdivisions, §§ 20.04.010 to 20.52.090) governs land divisions; its text was not opened.
    • RHR subdivisions: lot count is set by a slope-based area factor formula; where average slope exceeds 45 percent, average net lot area must be ten acres.
    • Lots above the RHR maximum may be created only if dedicated to the city.
    “title 20 subdivisions (§ 20.04.010 &ndash; § 20.52.090)”
  • Permit feesPublished (with conditions)

    Sewer connection permit fees inside Glendora city (Chapter 15.12). Building and other permit fees were not located in opened text.

    • Additional fees apply: $25 for a sewer pipe saddle, $15 for excavation under a public sidewalk or improvement, and $25 for inspection of manholes or junction structures.
    • Permit is void if work does not start within 180 days of issuance.
    • Subdivisions that have paid sewer inspection fees under the S.M.-2 forms are exempt from the permit fees; city-contracted sewer contractors are exempt.
    • The code text may be dated; the eCode360 master fee schedule was not opened.

    sewer connection permit fee: 10 USD (plus inspection, saddle, excavation and manhole fees under § 15.12.040) · sewer main inspection fee: 0.25 USD per lineal foot (main sewer construction applicants only)

    “a fee of ten dollars shall be paid to the director of finance or his or her authorized representative at the time an application for a permit is filed under the provisions of section 15.12.020.”
  • Permit processPartial

    Sewer connection permits inside Glendora city. The general building permit process was not located in opened text.

    • The applicant submits the application to the city engineer with the information required; a permit issues when the work follows city title regulations.
    • Repairs or stoppage clearing do not need a permit unless part of the sewer must be replaced.
    “any person desiring a permit for any of the purposes enumerated in this chapter, shall make application to the city engineer, giving such information as may be required”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Glendora or Los Angeles County directly.

  • Building permit — New residential construction inside Glendora city
  • Owner-builder exemption — Owner-builder construction inside Glendora city
  • Building code adopted — Building code adoption inside Glendora city
  • Inspections — Building inspections inside Glendora city
  • Certificate of occupancy — Certificates of occupancy inside Glendora city
15 more unanswered
  • Minimum dwelling size
  • Minimum lot size
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Glendora publishes no rule on the point, not that none exists. Los Angeles County’s page lists the county offices to call.

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