1423 Copper Mountain, Diamond Bar, California 91765, Diamond Bar, 91765 - 4 bed, 3 bath
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1423 Copper Mountain
Diamond Bar, California 91765
ACTIVE UNDER CONTRACT
CONDITION: EXCELLENT
4Beds
3Baths
2,380Sq Ft
7,144Lot Size
Property Price
LIST PRICE$1,249,888
EST. MARKET VALUE
$1,249,888
SUMMARY
This Turnkey Single Family Residence is a Strong Value Opportunity, listed at $1,299,999—positioned well below the $1,400,750 Fair Market Value by 7%. This valuation gap offers $100,751 in Instant Equity for the buyer. Featuring an Excellent Condition Rating, the home includes a paid solar system, PEX plumbing, and scenic city light views. Located in the Walnut Valley Unified School District, this property is an ideal choice for Owner-Occupants or growing families seeking a move-in ready, energy-efficient sanctuary.
Estimated Market Value
$1,249,888
Based on Realkey algorithm analyzing recent comparable sales in Diamond Bar.
Comparable Sales Map
Comparables within 1 miles sold in recently
Map unavailable.
| Address | Sold Price | Beds | Baths | Sq Ft | $/Sqft | Distance |
|---|---|---|---|---|---|---|
★ 1423 Copper Mountain Subject | $1,249,888* List Price | 4 | 3 | 2,380 | $525 | - |
A 23409 Coyote Springs Sold | $1,390,000 | 5 | 3 | 2,074 | $670 | 0.1 mi |
B 1348 Rolling Knoll Road Sold | $1,368,000 | 4 | 3 | 2,208 | $620 | 0.2 mi |
C 1303 Holly Leaf Way Sold | $1,388,000 | 5 | 3 | 2,447 | $567 | 0.4 mi |
D 23072 Aspen Knoll Sold | $1,476,899 | 4 | 3 | 2,579 | $573 | 0.4 mi |
E 23419 Sand Ridge Sold | $1,388,888 | 4 | 3 | 2,208 | $629 | 0.1 mi |
F 1669 Bronze Knoll Sold | $1,450,350 | 5 | 3 | 2,530 | $573 | 0.3 mi |
G 1456 Winterwood Lane Sold | $1,096,000 | 4 | 2 | 1,704 | $643 | 0.1 mi |
H 23028 Aspen Knoll Drive Sold | $1,230,000 | 4 | 3 | 2,165 | $568 | 0.4 mi |
I 1553 High Bluff Active | $1,399,990 List Price | 4 | 3 | 2,074 | $675 | 0.1 mi |
* Subject property listed price vs sold prices of comps.
Condition Analysis
See Full ReportOVERALL CONDITION SCORE
Excellent
TeardownExcellent
Property is new construction or fully renovated.
The property is in turnkey, mint condition featuring a modern renovated kitchen with shaker cabinets and quartz countertops, new interior and exterior paint, and upgraded PEX plumbing. Although built in 1978, the recent contemporary renovations (likely <5 years), new flooring, modern lighting, and paid solar system make it move-in ready with no immediate maintenance required.
PROSSTRENGTHS & OPPORTUNITIES
- Premier School District & Location
Situated in the award-winning Walnut Valley Unified School District and within walking distance to Quail Summit Elementary, this home offers exceptional educational value and a safe, quiet cul-de-sac setting.
- Energy Efficiency & Modern Upgrades
The property features a fully paid solar system for significant utility savings, complemented by recent PEX plumbing upgrades and a modern, turnkey interior that is move-in ready.
- Scenic Views & Outdoor Privacy
Residents can enjoy serene city light views from a private backyard retreat equipped with mature fruit trees, offering a perfect blend of tranquility and functional outdoor living space.
CONSRISKS & DEFICIENCIES
- 1970s Era Construction
Built in 1978, the home may retain some architectural limitations or original structural components that lack the full open-concept flow found in modern contemporary builds.
- Market Positioning
With 49 days on market, the property's current list price may be at the high end of the local market threshold, potentially requiring a price adjustment to attract remaining buyers in the current interest rate environment.
About 1423 Copper Mountain
Nestled on a quiet cul-de-sac in the highly desirable city of Diamond Bar, 1423 Copper Mountain offers the perfect blend of modern upgrades, privacy, energy efficiency, and top-rated schools. Located within walking distance to highly acclaimed Quail Summit Elementary and situated in the award-winning Walnut Valley Unified School District, this beautifully maintained home checks all the boxes for today’s buyers. This turnkey property is currently being refreshed with new interior, exterior paint, upgraded PEX plumbing throughout the home complementing the home’s updated kitchen and modern contemporary feel throughout. From the moment you walk in, you’ll notice the pride of ownership and attention to detail that make this home truly move-in ready. Step outside into your own private backyard retreat featuring mature fruit trees, peaceful surroundings, and scenic city light views. Whether you’re entertaining guests, enjoying your morning coffee, or relaxing after a long day, this backyard offers the perfect combination of tranquility and functionality. One of the standout features of this home is the fully paid solar system, helping dramatically reduce electricity costs year-round — a huge benefit for California homeowners looking for energy-efficient living and long-term savings. Outdoor enthusiasts will appreciate the close proximity to local hiking and walking trails, while the nearby Diamond Bar Center offers community events, concerts in the park, weddings, and year-round entertainment just minutes away. Conveniently located near shopping, dining, parks, and easy freeway access, this home combines suburban comfort with everyday convenience. If you’ve been searching for a modern upgraded home in Diamond Bar with views, paid solar, privacy, excellent schools, hiking trails, and a prime cul-de-sac location, this is one you do not want to miss. Walnut Valley Unified School District Quail Summit Elementary Paid solar home Cul-de-sac home City light views Turnkey home Modern upgrades Private backyard Fruit trees Hiking trails nearby Energy-efficient home Move-in ready Diamond Bar real estate Quiet neighborhood Family-friendly neighborhood
Property Details
Public Facts
- Property Type
- Single Family Residence
- Year Built
- 1978
- Lot Size
- 7,144 Sq. Ft.
Interior
- Total Bedrooms
- 4
- Total Bathrooms
- 3 (3 Full, 0 Half)
Exterior & Parking
No exterior & parking available.
Utilities & Misc
- HOA Fee
- $0 / Month
Neighborhood Insights
Sensitive Facilities
No sensitive facilities data found.
Neighborhood Comparison
| Feature | Subject | Average Home |
|---|---|---|
| Beds | 4.0 | 4.0 |
| Baths | 3.0 | 3.0 |
| Square foot | 2,380 | 2,280.2 |
| Lot Size | 7,144 | 9,961.367 |
| Price | $1.25M | $1.26M |
| Price per sq ft | $525 | $561 |
| Built year | 1978 | 1978 |
| HOA | $0 | $203 |
| Days on market | 89 | 49 |
Pricing History
Listed for Sale
Aug 20, 2026
$1,249,888
$1,269,888
-2% Price Drop
Initial Listing
Price Change
Aug 10, 2026
$1,269,888
$1,299,999
-2% Price Drop
Initial Listing
Price Change
Jun 12, 2026
$1,299,999
Initial Listing
Sold
Apr 10, 2020
$850,000
Public Record
Sold
May 4, 2005
$650,000
Public Record