23 Underhill Rd is a 2,179 square foot house on a 0.25 acre lot with 4 bedrooms and 2 bathrooms. - it last sold on June 27, 1995 for $570,000. Based on Redfin's Mill Valley data, we estimate the home's value is $2,593,005.
Single-familyProperty Type
1960Year Built
0.25 acresLot Size
$1,190Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$2,593,005
$2.0M since sold in June 1995$41K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 2.3% lower than the average sale price ($2.65M) 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.
Permits
Dec 15, 2016 • Final
Res - otc min mep
Remove and replace a water heater tank in the same location.
Plumbing
Water heater
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
Basement Information
Basement Sq. Ft: 187
Basement Type: Unfinished
Heating & Cooling
Heating Type: Central
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Exterior
Exterior Information
Building Style Type: Contemporary
Building Construction Quality: Good
Property Information
Subdivision Name: SCOTT VLY 01
Living Sq. Ft: 2,179
Building Sq. Ft: 2,366
# of Units: 1
Parking & Garage Information
Garage/Parking Sq. Ft: 625
Lot Information
# of Buildings: 1
Land Sq. Ft: 11,040
Legal Lot Number: 16
Municipality Name: MILL VALLEY
Acres: 0.2534
County Use Description: 1 FAMILY RESID
Financial
Assessor Information
Assessment Year: 2026
Tax Area: MILL VALLEY
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 2,179
Stories: —
Lot Size: 0.25 acres
Style: Single Family Residential
Year Built: 1960
Year Renovated: 1966
County: Marin County
APN: 033-152-02
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Edna Maguire Elementary School
Public K-5 • Assigned • 0.3mi
10/10
Mill Valley Middle School
Public 6-8 • Assigned • 1.1mi
9/10
Tamalpais High School
Public 9-12 • Assigned • 1.6mi
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
3/10 Fire Factor
0.15% chance of being in a wildfire in next 30 years
3/10 Heat Factor
8 days above 83° expected this year, 18 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
13 unhealthy days expected this year, 13 days in 30 years
Provided by First Street
Historical weather
Mill Valley, CA • 94941
Average low and high temperatures (°F)
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48
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76
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74
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72
55
61
50
56
47
Jan
Feb
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May
Jun
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Sun exposure
In this area, properties receive around 10.6 hours in
June and 5 hours in December, placing it above the
U.S. average for solar exposure.
10.6 hrs
5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$2.46M – $2.98M
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