3815 Castle Rock Rd is a 2,027 square foot house on a 10,322 square foot lot with 4 bedrooms and 2 bathrooms. - it last sold on June 16, 1975 for $37,000. Based on Redfin's Diamond Bar data, we estimate the home's value is $940,869.
Single-familyProperty Type
1963Year Built
10,322 sq ftLot Size
$464Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$940,869
$904K since sold in June 1975$35K since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 25.4% lower than the average sale price ($1.26M) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
RLM
Low/Medium Density Residential District
The RLM zoning district is intended primarily for existing subdivided areas developed with detached single-family dwellings. The maximum allowed density for new residential subdivisions within this zoning district will be five dwellings per gross acre. The RLM zoning district is consistent with the low density residential land use category of the general plan.
Permitted uses
Include but are not limited to:
Housing-Single unit
Housing-Senior
Housing-Other
Infrastructure
Fire house
Police station
Park & open space
Apr 25, 2025 • Final
Road wireless
Upgrade existing small cell facilities on an existing utility pole. Implement traffic control measures according to standard safety manuals.
Electrical
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Heating & Cooling
Heating Type: Central
Exterior
Property Information
Subdivision Name: 27577
Living Sq. Ft: 2,027
# of Units: 1
Legal Description: TRACT NO 27577 LOT 71
Lot Information
# of Buildings: 1
Land Sq. Ft: 10,322
Legal Lot Number: 71
Municipality Name: DIAMOND BAR
Acres: 0.237
Zoning Code: LCR17500*
County Use Description: SINGLE FAMILY RESID
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 2,027
Stories: —
Lot Size: 10,322 square feet
Style: Single Family Residential
Year Built: 1963
Year Renovated: 1972
County: Los Angeles County
APN: 8714017015
Home facts updated by county records on Aug 30, 2026
Around this home
Schools
Castle Rock Elementary School
Public K-5 • Assigned • 0.9mi
10/10
South Pointe Middle School
Public 6-8 • Assigned • 2.1mi
10/10
Diamond Bar High School
Public 9-12 • Assigned • 1.5mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
5/10 Fire Factor
7% chance of being in a wildfire in next 30 years
6/10 Heat Factor
7 days above 99° expected this year, 21 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
7/10 Air Factor
13 unhealthy days expected this year, 14 days in 30 years
Provided by First Street
Historical weather
Diamond Bar, CA • 91765
Average low and high temperatures (°F)
68
50
71
52
73
53
72
53
76
57
81
60
86
63
89
65
85
65
80
59
71
52
69
51
Jan
Feb
Mar
Apr
May
Jun
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Aug
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Dec
Sun exposure
In this area, properties receive around 9.5 hours in
June and 6.9 hours in December, placing it above the
U.S. average for solar exposure.
9.5 hrs
6.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$894,000 – $1.08M
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