Local permit snapshot

ADUs, additions and lot splits in Northridge

What owners in 91324 and 91325 are building, with combined permit statistics and separate ZIP-level detail.

9132491325

Across 91324 and 91325, Northridge owners have pulled 389 ADU permits (all types) since January 2024. The combined submission-to-permit median is 115 days, calculated from the underlying records for both ZIPs—not an average of their medians. ZIP-level figures are shown separately below. Source: LADBS via City of LA Open Data · Data through 2026-10-17.

Issued permits · Jan 2024 onward

How long do ADU permits take in Northridge?

ZIP 91324 + 91325

ADU permits since Jan 2024 (all types)

389

Median days from submission to permit, all ADUs

115 days

New detached ADU permits since Jan 2024

152

Non-ADU home additions since Jan 2024

159

Median declared value of new detached ADU permits: $126,500. That’s the declared construction value on the permit, not total project cost.

Source: LADBS via City of LA Open Data · Data through 2026-10-17

LADBS permit detail

ADU permit detail for Northridge

ADU permits since Jan 2024 (all types)

389

Declared ADU units on permits since Jan 2024

422

Sum of adu_changed on permits, not completed units.

Median days from submission to permit, all ADUs since Jan 2024

115 days

New detached ADU permits since Jan 2024

152

Permits, not units: these permits declare 162 ADU units.

Median days from permit to certificate of occupancy (CofO)

352 days

Share of 2020–2023 ADU permits with a CofO

80%

Rounded to a whole percent.

Junior ADU (JADU) permits since Jan 2024

110

Unique parcels with SB 9 or lot-split permits since Jan 2022

ADU permits describing legalization since Jan 2023

Non-ADU home additions since Jan 2024

159

Median 94 days from submission to permit.

Source: LADBS via City of LA Open Data · Data through 2026-10-17

Permits and completions by calendar year

Each column is counted by its own calendar year. 2026 is a partial year through October 17, 2026. Median days run from submission to permit issue. CofO counts are permits with a recorded CofO that year, not dwelling-unit totals; those permits can have been issued in earlier years. Timing medians keep submission-to-permit durations of 0–2,000 days and permit-to-CofO durations of 0–3,000 days. Source: LADBS via City of LA Open Data · Data through 2026-10-17
Year	ADU permits	Median days, submission to permit	ADU permits with CofO	Non-ADU home additions
2017	47	—	—	85
2018	106	—	40	84
2019	139	—	80	64
2020	64	128 days	95	42
2021	111	192 days	64	52
2022	126	162 days	80	79
2023	126	148 days	92	74
2024	136	148 days	109	63
2025	151	96 days	133	62
2026 (partial, through October 17, 2026)	102	106 days	109	34

ADU type mix, permits since Jan 2023

Median size and median declared value by type. Declared value is the declared construction value on the permit, not total project cost. Shares are rounded to whole percents, so these rows total 99% rather than 100%. Source: LADBS via City of LA Open Data · Data through 2026-10-17
Type	Share of permits	Median size	Median declared value
Garage conversion	41%	476 sq ft	$50,000
New detached	39%	1,078 sq ft	$125,500
Other conversion	10%	574 sq ft	$50,000
Attached addition	8%	875 sq ft	$120,000
Other	1%	422 sq ft	$40,000

ADU permits by type, since Jan 2024

Permit counts and declared ADU units are separate measures. Units sum adu_changed; they are not completed units. New detached permits declare 162 units. JADU permits are reported separately above. Source: LADBS via City of LA Open Data · Data through 2026-10-17
Type	Permits	Declared ADU units
Garage conversion	155	157
New detached	152	162
Other conversion	43	62
Attached addition	34	36
Other	5	5
All types	389	422

Source: LADBS via City of LA Open Data · Data through 2026-10-17

Data by postal code

The ZIP-level detail.

ZIP	ADU permits since Jan 2024 (all types)	Median days to permit, all ADUs since Jan 2024	New detached ADU permits since Jan 2024	Median days to permit, new detached ADUs	Median declared construction value, new detached ADU	Non-ADU home additions since Jan 2024	Median days to permit, non-ADU additions	Unique parcels with SB 9 or lot-split permits since Jan 2022	ADU permits per 1,000 single-family lots
91324	167	94 days	57	145 days	$128,300	61	80 days	35	—
91325	222	132 days	95	172 days	$125,000	98	100 days	64	—

Source: LADBS via City of LA Open Data · Data through 2026-10-17

Common questions

Questions about Northridge.

How long does an ADU permit take in Northridge?

Since January 2024, all ADU permits in 91324 and 91325 have taken a median of 115 days from submission to issue. Your timeline depends on plan completeness and plan-check type. Source: LADBS via City of LA Open Data · Data through 2026-10-17.

See the LADBS permit source

Is my Northridge lot big enough for an ADU or a lot split?

This permit snapshot does not include lot-size or zoning data for these ZIPs. California law allows detached ADUs up to 1,200 sq ft, subject to applicable standards. An SB 9 lot split needs both new lots to be at least 1,200 sq ft and at least 40% of the original lot. These figures do not determine parcel eligibility. Try the feasibility screen for your address.

Check your parcel HCD ADU guidance

What could a new unit rent for in Northridge?

Rent benchmarks are not included in this permit-only snapshot. Your free review includes a 15-minute call and initial parcel check, with a market rent check discussed on the call.

See the HUD benchmark source

A lot, reimagined

A typical project.

Every lot is different. This illustration shows one possible way to think about added housing; it is not a property study or a promise of what a specific parcel allows.

Illustration of an underused lot before added housing — Illustration — not an actual project

Illustration of the same lot with proposed added housing — Illustration — not an actual project

State guidance · local review matters

What the rules allow here.

California’s ADU and JADU framework sets statewide standards, while parcel conditions and local review still affect a project. See the California HCD ADU guidance.

Some parcels may qualify for an SB 9 duplex or urban lot split, subject to statutory requirements and site-specific exclusions. Read HCD’s SB 9 fact sheet.

Home additions are reviewed under applicable local approvals and California residential building standards; requirements depend on the property and proposed work. See HCD building standards.

This information is general context, not legal, zoning, or permit advice. A property-specific review is required.

Start with the property

Get a free review for your Northridge property.

Get a free property review

A 15-minute consult call and an initial parcel check.

Or call (213) 537-9530