Altadena

An unincorporated foothill community north of Pasadena.

Snapshot

Population

41,705

US Census ACS, 2024 / FBI UCR Table 8, 2024

Median home price

$1,400,000

Redfin, 2026-05

Median rent

$2,355/mo

US Census ACS, 2024

Crime / 1k

Data pending

Median sale price, year over year: +47.4% (rising)Redfin, 2026-05

Market

Price / sq ft

$765

Redfin, 2026-05

Months of supply

3.4

Redfin, 2026-05

Median days on market

42

Redfin, 2026-05

Renter-occupied

23.1%

US Census ACS, 2024

Median household income

$128,720

US Census ACS, 2024

Housing units

15,815

US Census ACS, 2024

Developments

What you can build here — ADU

LA County contractVHFHSZHCD Non-Compliance Flag

Unincorporated; LA County Title 22 controls. Typical SFR lot: 1 attached ADU + 1 detached ADU + 1 JADU. SB9 dual units allowed outside VHFHSZ and outside Eaton Fire boundaries (EO N-32-25). State 750 sq ft impact-fee and 500 sq ft school-fee exemptions apply. Ministerial ADU clock is 60 days; fire rebuild plan review goal <10 business days.

Last verified 2026-08-18. Not legal advice — confirm current requirements with Altadena's planning department. See the statewide ADU floor every city sits on top of.