Tucked at the end of a private cul-de-sac in Diablo, this exceptionally remodeled estate offers a rare opportunity to own TWO FULLY INDEPENDENT RESIDENCES on apx. 1/2 acre of park-like grounds.Thoughtfully designed the property features a refined single story main residence, showcasing vaulted ceilings, European white oak floors and a seamless indoor-outdoor flow. Custom detailing and amenities, including smart home technology provide comfort and convenience throughout! Expansive living spaces open to an elevated entertaining deck overlooking the resort-style pool and lush landscaping. The fully independent guest residence lives like a true second home - complete with its own private yard, an upstairs primary suite and an additional bedroom and bath on the main level. Ideal for multi-generational living, extended guests, or private work-from-home retreat. With versatility rarely found in today's market. The grounds are a stand out feature - an artful composition of mature landscaping, curated garden rooms and intimate outdoor spaces for both relation and entertaining. Every element has been created to enhance the experience of indoor-outdoor living. This is more than a home, it is a private dual residence estate offering a lifestyle of comfort, flexibility. and timeless appeal.
Listed by Raelene Sprague
·
License #00577360
·
Notable Real Estate
·
925-819-2109
Listed by Tonya Colton
·
License #01993057
·
Notable Real Estate
Last updated April 22, 2026
·
Source: bridgeMLS #41125142
Listing Facts
TypeSingle-family
NeighborhoodMount Diablo Estate Park
Bedrooms6
Bathrooms6
Days on Prevu66
Size4,246 sqft
Price per sqft$939
Amenities
Dishwasher
Private Outdoor Space
Washer/Dryer
Air Conditioning
Parking
Swimming Pool
Location
Mortgage Calculator
Listing History
04/15/2026
Price Decreased
$3,985,000
02/25/2026
Listed by Notable Real Estate
$4,122,000
Property Details for 22 Calle Del Casarillo
Exterior
Construction
Roof: Shingle
Stories: 1
Window Features: Skylight(s)
Year Built: 1972
Architectural Style: Craftsman
Builder Name: Custom
Construction Materials: Wood Shingles, Wood Siding
Exterior Features: Back Yard, Dog Run, Front Yard, Garden/Play, Side Yard, Sprinklers Automatic, Sprinklers Front, Sprinklers Side, Storage, Garden, Landscape Back, Landscape Front, Yard Space
Features
Fencing: Fenced, Full
Patio And Porch Features: Deck, Patio, Porch, Porch Steps
Pool Features: Gas Heat, Gunite, In Ground, Pool Sweep, See Remarks, Outdoor Pool
Pool Private: Yes
Measurements
Building Area Total: 4,246
Lot Features: 2 Houses / 1 Lot, Cul-De-Sac, Dead End, Sprinklers In Rear, Landscaped
How many bedrooms and bathrooms does this single-family home have?
There are 6 bedrooms and 6 bathrooms in this single-family home at 22 Calle Del Casarillo.
Does this single-family home have parking?
Yes, there are 2 parking spaces available for 22 Calle Del Casarillo.
How does 22 Calle Del Casarillo compare to other single-family homes in Mount Diablo Estate Park?
This single-family home is listed 3% below the average price for single-family homes in Mount Diablo Estate Park and has been on the market for 25 more days than the typical home in this area.
What is the square footage on this single-family home?
According to the MLS, this listing is 4,246 sqft.
22 Calle Del Casarillo is a 6-bedroom, 6-bath single-family home for sale in Diablo CA 94528. On Prevu for 66 days at $3,985,000. This includes a recent price decrease of $137,000. This residence features 4,246 square feet of living space, located in Contra Costa County. The median listing price for single-family homes in this area is $3,919,000. Additional amenities include private outdoor space, dishwasher, air conditioning, parking, swimming pool, and washer/dryer. View other single-family home listings in Contra Costa County.
Based on information from bridgeMLS and/or other sources. All data, including all measurements and calculations of area, is obtained from various sources and has not been, and will not be, verified by Prevu or the MLS. Information is provided exclusively for consumer's personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumer may be interested in purchasing.
Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.
