40 Underhill Rd is a 2,468 square foot house on a 9,016 square foot lot with 4 bedrooms and 3 bathrooms. Based on Redfin's Mill Valley data, we estimate the home's value is $2,485,645.
Single-familyProperty Type
1965Year Built
9,016 sq ftLot Size
$1,007Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$2,485,645
$51K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 11.1% lower than the average sale price ($2.80M) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$8,456 (+21.4%)
$62,506 + $401,493
$463,999
2024
$6,966 (+2.7%)
$61,281 + $393,622
$454,903
2023
$6,785 (+5.3%)
$60,079 + $385,905
$445,984
2022
$6,441 (+7.8%)
$58,901 + $378,339
$437,240
2021
$5,976 (−2.6%)
$57,746 + $370,921
$428,667
2020
$6,135 (+14.7%)
$56,614 + $363,649
$420,263
2019
$5,350 (−13.4%)
$56,034 + $359,921
$415,955
2018
$6,177 (+7.8%)
$54,935 + $352,865
$407,800
2017
$5,728 (+0.5%)
$52,803 + $339,166
$391,969
2016
$5,701 (+3.0%)
$52,803 + $339,166
$391,969
2015
$5,537 (+1.1%)
$51,767 + $332,517
$384,284
2014
$5,475 (−7.8%)
$49,991 + $321,107
$371,098
2013
$5,935 (−7.2%)
$49,991 + $321,107
$371,098
2012
$6,394 (+33.6%)
$49,765 + $319,658
$369,423
2011
$4,785 (+7.0%)
$48,790 + $313,391
$362,181
2010
$4,474 (+1.4%)
$47,833 + $307,247
$355,080
2009
$4,412 (+3.0%)
$47,476 + $304,952
$352,428
2008
$4,283
$47,589 + $305,677
$353,266
Tax history for 40 Underhill Rd
Year
Property tax
Land + Additions
Assessment*
2025
$8,456 (+21.4%)
$62,506 + $401,493
$463,999
2024
$6,966 (+2.7%)
$61,281 + $393,622
$454,903
2023
$6,785 (+5.3%)
$60,079 + $385,905
$445,984
2022
$6,441 (+7.8%)
$58,901 + $378,339
$437,240
2021
$5,976 (−2.6%)
$57,746 + $370,921
$428,667
2020
$6,135 (+14.7%)
$56,614 + $363,649
$420,263
2019
$5,350 (−13.4%)
$56,034 + $359,921
$415,955
2018
$6,177 (+7.8%)
$54,935 + $352,865
$407,800
2017
$5,728 (+0.5%)
$52,803 + $339,166
$391,969
2016
$5,701 (+3.0%)
$52,803 + $339,166
$391,969
2015
$5,537 (+1.1%)
$51,767 + $332,517
$384,284
2014
$5,475 (−7.8%)
$49,991 + $321,107
$371,098
2013
$5,935 (−7.2%)
$49,991 + $321,107
$371,098
2012
$6,394 (+33.6%)
$49,765 + $319,658
$369,423
2011
$4,785 (+7.0%)
$48,790 + $313,391
$362,181
2010
$4,474 (+1.4%)
$47,833 + $307,247
$355,080
2009
$4,412 (+3.0%)
$47,476 + $304,952
$352,428
2008
$4,283
$47,589 + $305,677
$353,266
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Aug 29, 2023 • Final
Residential plan check
Replace a retaining wall and fence at a residential property.
Grading
Dec 14, 2012 • Final
Residential plan check
Install a roof-mounted solar system on a residential building.
Electrical
Solar
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
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Exterior
Exterior Information
Building Style Type: Contemporary
Building Construction Quality: Good
Pool Information
Has Pool
Property Information
Subdivision Name: SCOTT VLY 03
Living Sq. Ft: 2,468
Building Sq. Ft: 2,468
# of Units: 1
Parking & Garage Information
Garage/Parking Sq. Ft: 508
Lot Information
# of Buildings: 1
Land Sq. Ft: 9,016
Legal Lot Number: 108
Municipality Name: MILL VALLEY
Acres: 0.207
County Use Description: 1 FAMILY RESID
Financial
Assessor Information
Assessment Year: 2026
Tax Area: MILL VALLEY
Public facts
Beds: 4
Baths: 3.0
Sq. Ft.: 2,468
Stories: —
Lot Size: 9,016 square feet
Style: Single Family Residential
Year Built: 1965
Year Renovated: 1977
County: Marin County
APN: 033-182-05
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Edna Maguire Elementary School
Public K-5 • Assigned • 0.4mi
10/10
Mill Valley Middle School
Public 6-8 • Assigned • 1.2mi
9/10
Tamalpais High School
Public 9-12 • Assigned • 1.7mi
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)
59
47
60
48
66
50
64
48
69
51
69
52
68
53
76
56
74
57
72
55
61
50
56
47
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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
$2.36M – $2.86M
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