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623 Clayton Ave

Not Listed · El Cerrito

623 Clayton Ave

Style

Single Family Residence

Zoning

RS-5

Year built

1927

Existing

1 bd · 1 ba

Interior

705 sf

Lot size

3,749 sf

$710,000

For Sale

Development Scenarios

Here's how you can use existing housing laws to add more housing units to this property. For illustrative purposes only, as actual site conditions should be verified in person.

ADU

Add 1 potential unit to the backyard
$272K-$477K estimated cost
$489K-$1.1M future value add

Single-Family Homes and ADUs on Separate Lots

Add 1-2 potential units
$836K-$937K estimated cost
$2.4M-$2.6M future value add
Loading infill model...

Density level

Density controls will appear after the model finishes loading.

You can demo a structure as long as its vacant / condemned / owner-occupied, has been off the rental market for 5 years, and has no Ellis act evictions in the past 15 years.

Generating the lot configuration for this scenario and density...

Financials

These estimates model the potential development economics for this scenario using local construction costs and comparable sale prices. They're provided for illustrative purposes only and aren't financial advice.

Selected ScenarioADU
Estimated Project Cost
$1,003,102
ADU scenario · 1 new unit · 400 new sf
Build Cost / SF
$
ADU build cost$271,802
27% of project cost
Property acquisition$731,300
73% of project cost
Estimated Project Value (2 Year)
$1,199,365
$1,179,687 1-year project value ·
19.6% total ROI
$196,263 potential ROI
Added scenario value$489,365
41% of completed value
Current property value$710,000
59% of completed value
Acquisition73%
Soft Costs6%
Hard Costs21%
Value Projections
Today list price$710,000
24-month added value$489,365
24-month project value$1,199,365
Potential ROI$196,263
Assumptions
Current sale / sf$1,136
Average sale / sf$1,127
Annual growth4.2%
Comp bedrooms1
Comp radius5 miles
Price / sf sourceAverage sold comps
Added sqft400 sf
Cost Breakdown

Unit Economics
Original Property
Acquisition only
Build New Homes
Soft + hard costs
All-In
Total project
# of original homes
N/A
# of new homes
1
Total homes
1
Per Home
N/A
Per Home
$272K
Per Home
$1.00M
# of original sq ft
625
# of new sq ft
400
Total sq ft
1,025
Per Sq Ft
N/A
Per Sq Ft
$680
Per Sq Ft
$979
Total
$731K
Total
$272K
Total
$1.00M
Financing Estimate
Construction Loan

Estimate construction proceeds, cash required, and interest-only payments.

Construction Estimate
Loan Proceeds
Construction basis
Soft + hard costs
$272K
Loan proceeds
65% loan-to-cost
$177K
Cash required
Unfinanced development cost
$95K
Monthly payment
Interest-only estimate
$2K

Timeline

Typical project phasing based on the selected scenario, density, and generated development scope.

Estimated Total Duration

11 months

ADU

Design

Concept design, site planning, and early coordination.

1 month

Month 1

Permitting

Planning review, entitlement approvals, and building permits.

3 months

Month 2 - Month 4

Site Work

Utility coordination, grading, and site preparation.

2 months

Month 5 - Month 6

Construction

Vertical construction through final inspection.

5 months

Month 7 - Month 11

Property Overview

MLS: bridgeMLS

Property information from bridgeMLS

Listed by Marni Fischer · District Homes

bridgeMLS © 2026. Information Deemed Reliable but not Guaranteed. This information is being provided by bridgeMLS. The listings presented here may or may not be listed by the Broker/Agent operating this website. This information is intended for the personal use of consumers and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated at October 2, 2026 at 12:17 PM PDT.

Location

Data from Type Five
Jurisdiction
El Cerrito
Zoning
RS-5
Overlay Districts
-
Climate Zone
Zone 3
Transit Access (1/2 mi)
Yes (El Cerrito Plaza BART Station · 0.46 mi)

Natural Hazards

Data from Type Five
Flood Zone
X
Liquefaction Risk
No
Landslide Risk
No
Fault Zone
No

Fire Risk

Data from Type Five
Fire Hazard Zone
NOT IN A VHFHSV
Fire Responsibility
LRA
Wildfire Protection Req.
No