4738 Blum Rd is a 572 square foot house on a 10,454 square foot lot with 2 bedrooms and 1 bathroom. Based on Redfin's Martinez data, we estimate the home's value is $469,614.
Single-familyProperty Type
1942Year Built
10,454 sq ftLot Size
$821Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$469,614
$4,000 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 26.6% lower than the average sale price ($640K) 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
$1,613 (+3.1%)
$24,706 + $15,995
$40,701
2024
$1,564 (+6.1%)
$24,222 + $15,682
$39,904
2023
$1,474 (+5.9%)
$23,748 + $15,375
$39,123
2022
$1,393 (+6.3%)
$23,283 + $15,074
$38,357
2021
$1,311 (+5.6%)
$22,827 + $14,779
$37,606
2020
$1,242 (+5.3%)
$22,380 + $14,490
$36,870
2019
$1,179 (+5.9%)
$22,151 + $14,342
$36,493
2018
$1,114 (+2.3%)
$21,717 + $14,061
$35,778
2017
$1,089 (+6.5%)
$20,875 + $13,516
$34,391
2016
$1,023 (+1.6%)
$20,875 + $13,516
$34,391
2015
$1,007 (+1.8%)
$20,466 + $13,251
$33,717
2014
$989 (+1.3%)
$19,765 + $12,797
$32,562
2013
$976 (+2.5%)
$19,765 + $12,797
$32,562
2012
$952 (+0.5%)
$19,676 + $12,740
$32,416
2011
$947 (+0.3%)
$19,291 + $12,491
$31,782
2010
$944 (+0.6%)
$18,913 + $12,247
$31,160
2009
$938 (+7.1%)
$18,772 + $12,156
$30,928
2008
$876
$18,817 + $12,185
$31,002
Tax history for 4738 Blum Rd
Year
Property tax
Land + Additions
Assessment*
2025
$1,613 (+3.1%)
$24,706 + $15,995
$40,701
2024
$1,564 (+6.1%)
$24,222 + $15,682
$39,904
2023
$1,474 (+5.9%)
$23,748 + $15,375
$39,123
2022
$1,393 (+6.3%)
$23,283 + $15,074
$38,357
2021
$1,311 (+5.6%)
$22,827 + $14,779
$37,606
2020
$1,242 (+5.3%)
$22,380 + $14,490
$36,870
2019
$1,179 (+5.9%)
$22,151 + $14,342
$36,493
2018
$1,114 (+2.3%)
$21,717 + $14,061
$35,778
2017
$1,089 (+6.5%)
$20,875 + $13,516
$34,391
2016
$1,023 (+1.6%)
$20,875 + $13,516
$34,391
2015
$1,007 (+1.8%)
$20,466 + $13,251
$33,717
2014
$989 (+1.3%)
$19,765 + $12,797
$32,562
2013
$976 (+2.5%)
$19,765 + $12,797
$32,562
2012
$952 (+0.5%)
$19,676 + $12,740
$32,416
2011
$947 (+0.3%)
$19,291 + $12,491
$31,782
2010
$944 (+0.6%)
$18,913 + $12,247
$31,160
2009
$938 (+7.1%)
$18,772 + $12,156
$30,928
2008
$876
$18,817 + $12,185
$31,002
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Mar 23, 2009 • Final
Building - residential plumbing
Replace the water heater.
Plumbing
Water heater
Feb 3, 2009 • Active
Building/rrip/single family/na
Work on a single-family home.
Remodel
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
Room Information
# of Rooms: 4
Exterior
Property Information
Subdivision Name: RANCHO LAS JUNTAS
Living Sq. Ft: 572
Ground Floor Sq. Ft: 572
Building Sq. Ft: 572
# of Stories: 1
Legal Description: POR RO LAS JUNTAS
Lot Information
# of Buildings: 1
Land Sq. Ft: 10,454
Acres: 0.24
Zoning Code: R-7
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 572
Stories: 1.0
Lot Size: 10,454 square feet
Style: Single Family Residential
Year Built: 1942
Year Renovated: 1942
County: Contra Costa County
APN: 1591900202
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Las Juntas Elementary School
Public K-5 • Assigned • 1.1mi
5/10
Martinez Junior High School
Public 6-8 • Assigned • 3.2mi
7/10
Alhambra Senior High School
Public 9-12 • Assigned • 3.2mi
8/10
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
2/10 Fire Factor
0.00% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 98° expected this year, 14 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
Martinez, CA • 94553
Average low and high temperatures (°F)
60
43
62
45
70
49
70
49
77
53
80
55
80
56
87
59
84
59
78
56
64
49
56
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 11.8 hours in
June and 4.8 hours in December, placing it above the
U.S. average for solar exposure.
11.8 hrs
4.8 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$447,000 – $541,000
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