Snapshot
Population
53,355
US Census ACS, 2024 / FBI UCR Table 8, 2024
Median home price
$1,200,000
Redfin, 2026-05
Median rent
$2,521/mo
US Census ACS, 2024
Crime / 1k
19.4
FBI UCR Table 8, 2024
Median sale price, year over year:▲ +11.1% (rising)Redfin, 2026-05
5-year crime trend:▬ +1.2% (flat)FBI UCR, 2019→2024
Market
Price / sq ft
$562
Redfin, 2026-05
Months of supply
3.3
Redfin, 2026-05
Median days on market
48
Redfin, 2026-05
Renter-occupied
22.7%
US Census ACS, 2024
Median household income
$108,281
US Census ACS, 2024
Housing units
18,969
US Census ACS, 2024
Developments
No tracked developments for Diamond Bar yet.
What you can build here — ADU
City department
Typical SFR: 1 ADU + 1 JADU under §22.42.120. Size 850-1,000 sq ft. State fee exemptions apply. 60-day ministerial clock.
Last verified 2026-08-18. Not legal advice — confirm current requirements with Diamond Bar's planning department. See the statewide ADU floor every city sits on top of.