Can you build an ADU in North Hollywood?

Is my North Hollywood lot big enough for an ADU?

Almost always. There is no minimum lot size for an ADU under state law ⁵, and the typical North Hollywood house lot has room to spare. We measured every City of Los Angeles single-family parcel in the three ZIPs on the LA County Assessor's parcel map ¹:

• 91605: 6,072 house lots, median 6,754 sq ft, half of them between 6,202 and 7,649 sq ft.
• 91606: 4,695 house lots, median 6,750 sq ft, half between 6,099 and 7,306 sq ft.
• 91601: 2,559 house lots, median 6,747 sq ft, half between 6,071 and 7,425 sq ft.

An 800 sq ft backyard house uses about 12 percent of a 6,750 sq ft lot. For what fits on a lot this size, see What size ADU fits on a 6,600 sq ft lot.

North Hollywood is flat Valley floor. In 91605, none of the single-family parcels touched the city's Very High Fire Hazard Severity Zone map layer we checked ¹. That layer was last edited in 2019, so confirm your own parcel on ZIMAS ¹³.

Are my neighbors in 91601, 91605 and 91606 actually getting ADU permits?

Yes, a lot of them. From January 1, 2025 through October 3, 2026, LADBS issued 252 ADU and JADU building permits in 91606, 245 in 91605 and 163 in 91601 ³. Year-by-year counts for every Valley ZIP are in How many ADUs are being built in the San Fernando Valley.

What that guide does not show is the zoning behind the permits. We matched each permit to the zone LADBS recorded for the lot ³:

• 91606: 211 of 252 permits were on R1 lots and 31 on RD lots.
• 91605: 180 were on R1 lots, 39 on RS, RE or RA lots, and 11 on RD lots.
• 91601: only 73 of 163 were on R1 lots. Another 59 were on RD lots, 3 on R2, and 28 in R3, R4 or commercial zones.

In all three ZIPs, the largest group was alteration permits, the kind used when an existing building or room becomes the ADU: 122 in 91606, 106 in 91605 and 87 in 91601 ³. These are permit counts, not finished homes, and one project can carry more than one permit.

My lot is zoned RD or R2, or it already has a duplex. Can I still add an ADU?

Yes. In Los Angeles, ADUs are permitted in every area zoned for single-family or multifamily homes, as long as there is an existing or proposed home on the lot ⁹. What changes is which menu you order from.

• A house on an RD or R2 lot. You use the single-family options: a converted space, a JADU and a new detached unit of up to 800 sq ft ⁴⁹. In 91601, 160 of the 163 recent ADU permits were filed against a one- or two-family dwelling, not an apartment building ³.
• A duplex, triplex or apartment building. For state ADU law, two or more attached units on one lot is a multifamily dwelling ⁶. You can convert space that is not lived in, such as storage rooms, attics, basements or garages, into at least one ADU and up to 25 percent of the existing units ⁷. You can also add up to eight detached ADUs, but no more than the number of existing units on the lot, with 4-foot side and rear setbacks ⁸.
• A house and a multifamily building on the same lot. You pick either the single-family options or the multifamily options, not both ¹⁰.

This matters in North Hollywood because so many lots are not single houses. The Assessor classes 1,643 City of LA parcels in 91601 as two-or-more-unit residential, against 2,559 single-family house lots. In 91606 the figures are 1,064 and 4,695, and in 91605, 774 and 6,072 ². Older multi-unit buildings also raise rent control questions, which Is my ADU under rent control in Los Angeles covers.

Should I convert my garage or build a new backyard house?

Both are allowed, and the permit counts above suggest many North Hollywood owners start with what is already standing. State law allows detached garages and other existing accessory structures to become ADUs ¹⁴, and no setback is required for an ADU built inside an existing structure or rebuilt in the same place to the same size ¹⁵.

The question that decides a conversion is whether the garage was legal to begin with. Look up the permit history for your address on ZIMAS ¹³, and read How to check if your LA garage was permitted before you pay for plans. If you are comparing a JADU inside the house, see JADU vs ADU; a JADU needs a single-family house on the lot, even in a multifamily zone ⁹.

Do I need parking, and does being near the Metro station help?

Most North Hollywood lots will not need a parking space for the ADU. The city cannot impose parking standards on an ADU within one-half mile walking distance of public transit ¹¹, and LA City Planning reads public transit to include any fixed-route bus or train stop ¹². Many North Hollywood blocks have a bus stop within that distance, but check yours.

Height is a different test. A detached ADU can go from 16 to 18 feet when it is within a half-mile walk of a major transit stop or a high-quality transit corridor ¹⁶, and the city says those require a bus line with 15-minute peak headways ¹². Planning accepts a map of the walking distance for parking, and the SB 9 Eligibility viewer on ZIMAS for both tests ¹². More detail is in our guides on parking and height limits.

What usually stops an ADU in North Hollywood?

Usually not space, slope or fire. On flat lots like these, the hard questions are utilities, easements and the paperwork on what is already built.

• Sewer: how far the main is and where your lateral runs. See the 200-foot sewer rule.
• Power: whether your panel can carry another home. See Do I need a 200 amp panel.
• Water: whether the unit needs its own meter. See Do I need a new water meter.
• Easements: any LADWP easement near where you want to build. See ADUs near LADWP easements.

LADBS also lists the departments that must clear a project and warns that some can take months ¹⁷. On a multifamily lot, expect more of these questions, not fewer, because there are more existing units and connections.

What should I check first, and in what order?

Start with the free lookups and work toward the expensive ones.

1. Zone and history: pull up your address on ZIMAS for the zone, any overlays, and the building permit history ¹³.
2. What is on the lot: one house, a house and a back unit, or an attached duplex or apartment building. That decides which ADU options apply ⁶¹⁰.
3. Garage: whether it was permitted, if you plan to convert it.
4. Transit: the walking distance to the nearest bus or train stop, for parking and height ¹¹¹².
5. Utilities and easements: sewer, panel, water meter and any LADWP easement, before anyone draws plans.

This is the kind of thing a lot check settles in one pass, before you spend money on plans for a lot that has a problem.

Quick answers

Sources

1. LA County Assessor parcel layer (LACounty_Parcel), single-family parcels in ZIPs 91601, 91605 and 91606, City of Los Angeles; with LA City GeoHub Very High Fire Hazard Severity Zones layer, LA County Assessor / City of Los Angeles GeoHub (Greenlight analysis). Facts checked 2026-10-11
2. LA County Assessor parcel layer (LACounty_Parcel), residential parcels by use type in ZIPs 91601, 91605 and 91606, City of Los Angeles, LA County Assessor (Greenlight analysis). Facts checked 2026-10-11
3. Building Permits Issued from 2020 to Present (N), dataset pi9x-tg5x, ZIPs 91601, 91605 and 91606, LADBS via City of Los Angeles Open Data (Greenlight query). Facts checked 2026-10-11
4. Accessory Dwelling Unit Handbook (March 2026), 66323 Units: Single-Family Detached ADUs, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
5. Accessory Dwelling Unit Handbook (March 2026), Lot size, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
6. Accessory Dwelling Unit Handbook (March 2026), Definitions: Multifamily Dwelling, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
7. Accessory Dwelling Unit Handbook (March 2026), Multifamily Converted ADUs, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
8. Accessory Dwelling Unit Handbook (March 2026), Multifamily Detached ADUs, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
9. ZA Memo No. 143 Revision 1, Accessory Dwelling Units (August 2025), Summary of ADU and JADU Development Standards, Los Angeles City Planning, Office of Zoning Administration. Facts checked 2026-10-11
10. ZA Memo No. 143 Revision 1, Combinations of ADUs and JADUs, Los Angeles City Planning, Office of Zoning Administration. Facts checked 2026-10-11
11. Accessory Dwelling Unit Handbook (March 2026), Parking, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
12. ZA Memo No. 143 Revision 1, Q.34: verifying proximity to transit, Los Angeles City Planning, Office of Zoning Administration. Facts checked 2026-10-11
13. Zoning Search (ZIMAS), Los Angeles City Planning. Facts checked 2026-10-11
14. Accessory Dwelling Unit Handbook (March 2026), Detached ADUs, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
15. Accessory Dwelling Unit Handbook (March 2026), Setbacks, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
16. Accessory Dwelling Unit Handbook (March 2026), Summary of Recent Changes: Detached ADU Height Allowances, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
17. Accessory Dwelling Unit Plan Check Correction Sheet, item B.1, Los Angeles Department of Building and Safety (LADBS). Facts checked 2026-10-11
18. Accessory Dwelling Unit Handbook (March 2026), Summary of Recent Changes: impact fees, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11
19. Accessory Dwelling Unit Handbook (March 2026), Summary of Recent Changes: deemed approved, California Department of Housing and Community Development (HCD). Facts checked 2026-10-11

Greenlight is not a contractor, architect or engineer, and this is not legal advice. Rules change; every fact here shows the date we last checked it.