Google street view image for 18 Seminary Ridge Pl, Clayton, CA 94517

Off market

$2,045,546

•

5 ba

•

8,300

sq ft

18 Seminary Ridge Pl, Clayton, CA 94517

About this home

18 Seminary Ridge Pl is a 8,300 square foot house on a 2.7 acre lot with 5 bedrooms and 5 bathrooms. Based on Redfin's Clayton data, we estimate the home's value is $2,045,546.

Single-familyProperty Type

2012Year Built

2.7 acresLot Size

$246Est. Price/Sq.Ft.

3 car garageParking

Source:Public Records

Redfin Estimate

$2,045,546

$21K since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 36.6% higher than the average sale price ($1.50M) of 6 comparable homes.

SOLD OCT 28, 2026
$1,500,000
A
4 beds3 baths3,030 sq ft
110 Forest Hill Dr, Clayton, CA 94517
SOLD SEP 24, 2026
$1,700,000
B
4 beds3 baths3,011 sq ft
4 Pardi Ln, Clayton, CA 94517
SOLD SEP 4, 2026
$1,630,000
C
4 beds2.5 baths3,307 sq ft
1116 Peacock Creek Dr, Clayton, CA 94517
SOLD JUL 28, 2026
$1,432,500
D
4 beds3 baths2,848 sq ft
1016 Pine Hollow Ct, Clayton, CA 94517
SOLD MAY 5, 2026
$1,550,000
E
4 beds3.5 baths3,853 sq ft
1000 Froyd Rd, Concord, CA 94521
SOLD BY REDFIN SEP 14, 2026
$1,170,000
F
4 beds3 baths2,643 sq ft
242 El Pueblo Pl, Clayton, CA 94517

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Earn from this home

Sell

$1,937,155

Est. take-home

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Rent

$7,058/mo

Redfin rental estimate

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Market trends in 94517, CA

Last updated October 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-list price

100.7%

0.4% MoM

Median sale price

$1.1M

$3K MoM

Avg. days on market

21d

10 days MoM

Recently sold homes

4 MoM

New listings for sale

$1,499,000
4 beds3 baths3,016 sq ft
24 Promontory Pl, Clayton, CA 94517
$1,550,000
5 beds3 baths2,691 sq ft
109 Mt Trinity Ct, Clayton, CA 94517
$1,175,000
5 beds3.5 baths2,260 sq ft
68 Nottingham Pl, Clayton, CA 94517
OPEN TUE, 10:30AM TO 12:30PM
$849,000
3 beds2 baths1,352 sq ft
1377 El Camino Dr, Clayton, CA 94517
$815,000
3 beds2.5 baths1,939 sq ft
1766 Indian Wls, Clayton, CA 94517
See all

Provided by Redfin

Sale history for 18 Seminary Ridge Pl

Year

Property tax

Land + Additions

Assessment*

2026

$20,449 (+1.9%)

$628,023 + $727,249

$1,355,272

2025

$20,076 (+2.3%)

$628,023 + $727,249

$1,355,272

2024

$19,616 (+2.2%)

$615,709 + $712,990

$1,328,699

2023

$19,193 (+0.9%)

$603,637 + $699,010

$1,302,647

2022

$19,018 (+1.9%)

$591,801 + $685,304

$1,277,105

2021

$18,671 (+1.3%)

$580,198 + $671,867

$1,252,065

2020

$18,439 (+2.1%)

$568,822 + $658,694

$1,227,516

2019

$18,066 (+3.0%)

$562,990 + $651,940

$1,214,930

2018

$17,535 (+6.0%)

$551,951 + $639,157

$1,191,108

2017

$16,544 (+2.7%)

$530,519 + $574,339

$1,104,858

2016

$16,101 (+1.2%)

$530,519 + $574,339

$1,104,858

2015

$15,915 (+1.6%)

$520,117 + $563,078

$1,083,195

2014

$15,663 (+2.4%)

$502,270 + $543,757

$1,046,027

2013

$15,289 (+152.6%)

$502,270 + $543,757

$1,046,027

2012

$6,052 (+133.7%)

$500,000 + $541,300

$1,041,300

2011

$2,590 (+1.1%)

$213,260

2010

$2,562 (+0.5%)

$209,079

2009

$2,550

$207,517

2008

$208,010

Tax history for 18 Seminary Ridge Pl

Year

Property tax

Land + Additions

Assessment*

2026

$20,449 (+1.9%)

$628,023 + $727,249

$1,355,272

2025

$20,076 (+2.3%)

$628,023 + $727,249

$1,355,272

2024

$19,616 (+2.2%)

$615,709 + $712,990

$1,328,699

2023

$19,193 (+0.9%)

$603,637 + $699,010

$1,302,647

2022

$19,018 (+1.9%)

$591,801 + $685,304

$1,277,105

2021

$18,671 (+1.3%)

$580,198 + $671,867

$1,252,065

2020

$18,439 (+2.1%)

$568,822 + $658,694

$1,227,516

2019

$18,066 (+3.0%)

$562,990 + $651,940

$1,214,930

2018

$17,535 (+6.0%)

$551,951 + $639,157

$1,191,108

2017

$16,544 (+2.7%)

$530,519 + $574,339

$1,104,858

2016

$16,101 (+1.2%)

$530,519 + $574,339

$1,104,858

2015

$15,915 (+1.6%)

$520,117 + $563,078

$1,083,195

2014

$15,663 (+2.4%)

$502,270 + $543,757

$1,046,027

2013

$15,289 (+152.6%)

$502,270 + $543,757

$1,046,027

2012

$6,052 (+133.7%)

$500,000 + $541,300

$1,041,300

2011

$2,590 (+1.1%)

$213,260

2010

$2,562 (+0.5%)

$209,079

2009

$2,550

$207,517

2008

$208,010

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Permits

Mar 10, 2017 • Final

Building/residential/p/pool

Construct a new swimming pool with a slide and spa.

Pool and hot tub

Jul 30, 2013 • Final

Building - residential plumbing

Install a gas line for a fire pit.

Gas

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: 11

Exterior

Pool Information
Has Pool

Property Information
Subdivision Name: DIABLO POINTE SUB 8719
Living Sq. Ft: 8,300
Ground Floor Sq. Ft: 2,100
Building Sq. Ft: 8,300
# of Stories: 2
Legal Description: T8719 L4

Parking & Garage Information
Garage/Parking Sq. Ft: 702

Lot Information
# of Buildings: 1
Land Sq. Ft: 117,612
Legal Lot Number: 4
Acres: 2.7
Zoning Code: A-2
County Use Description: SINGLE FAMILY

Financial

Assessor Information
Assessment Year: 2026

Public facts

Beds: 5
Baths: 5.0
Sq. Ft.: 8,300
Stories: 2.0
Lot Size: 2.7 acres
Style: Single Family Residential
Year Built: 2012
Year Renovated: 2012
County: Contra Costa County
APN: 1196300048

Home facts updated by county records on Oct 30, 2026

Around this home

Schools

K - 12
Preschool & daycare

Mt. Diablo Elementary School

Public K-5 • Assigned • 1.7mi

9/10

Diablo View Middle School

Public 6-8 • Assigned • 0.7mi

9/10

Northgate High School

Public 9-12 • Assigned • 4.9mi

9/10

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

8/10 Fire Factor

30% chance of being in a wildfire in next 30 years

4/10 Heat Factor

10 days above 93° expected this year, 20 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

9/10 Air Factor

17 unhealthy days expected this year, 18 days in 30 years

Provided by First Street

Historical weather

Clayton, CA • 94517

Average low and high temperatures (°F)

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

$1.94M – $2.35M

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Nearby similar homes

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New listings for sale in 94517

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4 beds3 baths3,016 sq ft

24 Promontory Pl, Clayton, CA 94517

Expansive decking • Mature landscaping • Colorful gardens

$1,550,000

5 beds3 baths2,691 sq ft

109 Mt Trinity Ct, Clayton, CA 94517

Backs to open space • Unobstructed views • Pool

$1,175,000

5 beds3.5 baths2,260 sq ft

68 Nottingham Pl, Clayton, CA 94517

Updated kitchen • Owned solar • Rv parking

OPEN TUE, 10:30AM TO 12:30PM

$849,000

3 beds2 baths1,352 sq ft

1377 El Camino Dr, Clayton, CA 94517

Expansive backyard • Remodeled kitchen • Large patio

$815,000

3 beds2.5 baths1,939 sq ft

1766 Indian Wls, Clayton, CA 94517

Oakhurst golf course • Extensive deck • Local amenities

Home values near 18 Seminary Ridge Pl

Data from public records.

Address	Redfin Estimate
26 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 3910 Sq. Ft.	$1,816,097
14 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 4150 Sq. Ft.	$2,002,161
19 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 3834 Sq. Ft.	$1,894,079
3 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 3757 Sq. Ft.	$1,726,335
9 Seminary Ridge Place, Clayton, CA 5 Beds \| 4 Baths \| 3691 Sq. Ft.	$1,732,592
8 Rialto Drive, Clayton, CA 4 Beds \| 2.5 Baths \| 2032 Sq. Ft.	$1,252,971
26 Rialto Drive, Clayton, CA 4 Beds \| 3 Baths \| 2010 Sq. Ft.	$806,061

Address	Redfin Estimate
22 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 3910 Sq. Ft.	$1,857,453
15 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 3910 Sq. Ft.	$1,999,335
6 Seminary Ridge Place, Clayton, CA 5 Beds \| 4 Baths \| 3691 Sq. Ft.	$1,617,611
5 Seminary Ridge Place, Clayton, CA 3 Beds \| 3 Baths \| 3301 Sq. Ft.	$1,772,379
27 Rialto Drive, Clayton, CA 5 Beds \| 2.5 Baths \| 2324 Sq. Ft.	$1,140,734
38 Rialto Drive, Clayton, CA 4 Beds \| 3 Baths \| 2032 Sq. Ft.	$1,026,387
21 Rialto Drive, Clayton, CA 3 Beds \| 3 Baths \| 2324 Sq. Ft.	$1,092,481

Address	Redfin Estimate
10 Seminary Ridge Place, Clayton, CA 5 Beds \| 4 Baths \| 3691 Sq. Ft.	$1,595,605
23 Seminary Ridge Place, Clayton, CA 5 Beds \| 4.5 Baths \| 3910 Sq. Ft.	$1,920,296
2 Seminary Ridge Place, Clayton, CA 4 Beds \| 3 Baths \| 3757 Sq. Ft.	$1,584,620
27 Seminary Ridge Place, Clayton, CA 4 Beds \| 4 Baths \| 4150 Sq. Ft.	$2,023,287
14 Rialto Drive, Clayton, CA 3 Beds \| 3 Baths \| 2324 Sq. Ft.	$1,091,869
20 Rialto Drive, Clayton, CA 4 Beds \| 3 Baths \| 2391 Sq. Ft.	$1,065,636
33 Rialto Drive, Clayton, CA 4 Beds \| 2 Baths \| 1895 Sq. Ft.	$1,027,999

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 94517, CA

Sale history for 18 Seminary Ridge Pl

Tax history for 18 Seminary Ridge Pl

Permits

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 94517

Home values near 18 Seminary Ridge Pl

More real estate resources