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Location and Projects

Address
P O BOX 252, Diablo, CA, 94528
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Joseph Langon Construction

Serving Diablo, California, Joseph Langon brings nearly four decades of experience to residential construction projects in the area. Since launching his business 39 years ago, Langon has managed a range of projects for local homeowners, handling both renovations and new construction. With permits issued across multiple properties in Diablo, his portfolio includes custom home builds, remodels, and structural updates. Langon’s work showcases a familiarity with the specific needs of Contra Costa County residences, from updating kitchens and bathrooms to modernizing living spaces and addressing code-compliance upgrades. He provides direct oversight throughout each phase of the construction process, ensuring projects align with client goals and local regulations. Langon remains a longstanding resource for homeowners in Diablo seeking comprehensive general contracting services.

Joseph Langon Contact Information

Phone: (925) 938-4925 Edit
Address: P O BOX 252, Diablo, CA 94528 Edit

Joseph Langon Diablo

Quality

103
90th percentile
How is the BuildZoom score calculated?
Pro tip: We generally recommend hiring a contractor with a score higher than 95.
Joseph Langon has a BuildZoom score of 103, which places them above 90% of 336,931 contractors in California.

Activity

2 projects
 2025
4 projects
 2024
6 projects
 2023
Our building permit records indicate that Joseph Langon has worked on at least 12.0 projects over the past 3 years.

This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.

Pricing

1 project
 < $5k
3 projects
 $5k-$20k
1 project
 $20k-$50k
1 project
 $100k-$250k
2 projects
 $1mil+
Value Not Public: 4.0 projects
The typical size of their permits is approximately $10,000. This graph shows the distribution of these job values.
Pro tip: For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.

Building Permits by Joseph Langon

Sort by: Notable Notable | Date Date | Job Value Job Value

This is a sample of this contractor's permits. Click here to access their complete permit history.

Residential - single family
121 Ravenswood Ct, Petaluma, CA, 94952
2024-02-13
Construction of new 2991sqft single family dwelling 682sqft garage 200sqft deck. [revision to permit approved 11/4/19; for exterior material changes only including: window color from dark bronze to marvin bronze; roof color from boral barcelona to walnut creek blend; entry door changed to arched top; chimney shroud change; window bays from wood siding to stone veneer and built-out stu... see more
Valuation:
$1,300,000
Permit #:
BLDG-18-0777
Status:
complete
Fee:
$81,624
Permit Type:
N/A
Building Type:
N/A
Permit submittal
1854 Poplar Dr, Walnut Creek, CA, 94595
2022-10-07
Remodel and addition to an existing single family residence on an existing lot of record. project adds 387 s.f. with a new bedroom bathroom room and closet. project also remodels an existing bedroom into a hallway laundry room and closet
Valuation:
$200,000
Permit #:
BISUB22-03569
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential additions
755 Kirkcrest Rd, Danville, CA, 94526
2025-02-03
Rsfd 5374 sf garage 1631 sf in conjunction with b22-016418
Valuation:
$1,500,000
Permit #:
B22-016417
Status:
final
Fee:
$26,255
Permit Type:
N/A
Building Type:
N/A
Building/residential/mir/miscellaneous residential
The, Lafayette, CA, 94549
2022-09-14
New retaining wall attached to rear patio for custom home on lot 5 at the nines
Valuation:
$3,000,000
Permit #:
BIMIR22-010382
Status:
expired
Fee:
$791
Permit Type:
N/A
Building Type:
N/A
Building/residential/mir/miscellaneous residential
The, Lafayette, CA, 94549
2022-09-14
New detached retaining wall in rear of custom home on lot 5 at the nines
Valuation:
$3,000,000
Permit #:
BIMIR22-010381
Status:
expired
Fee:
$941
Permit Type:
N/A
Building Type:
N/A
Building/residential/ad/single family addition
1854 Poplar Dr, Walnut Creek, CA, 94595
2022-10-26
New 387 sq ft addition for bedroom bathroom & closet. interior remodel of bedroom hallway laundry room & closet
Valuation:
$200,000
Permit #:
BIAD22-012245
Status:
expired
Fee:
$6,502
Permit Type:
N/A
Building Type:
N/A
Building/residential/r/new single family-duplex
99 Oakridge Ct, Danville, CA, 94506
2019-07-18
New single family residence 9009sf living with attached 1568sf garage and 2259sf covered patios ** replacing demolished residence (5558sf living). see demolish permit # bid19-006953 **
Valuation:
N/A
Permit #:
BIR19-006953
Status:
final
Fee:
$23,464
Permit Type:
N/A
Building Type:
N/A
Building permit
20427 Marshall St, Castro Valley, CA, 94546
2021-02-03
Completion permit to bld2019-04347 & bld2017-01686. new units # 22 23 & 24. to convert 9 double open carports to 3 apartments (2 776sf habitable) and 6 single enclosed garages (1 250 sf garage). each apartment willl have 2 bedrooms 2bathrooms kitchen/dining room living room laundry closet 1 car garage. (orig. valuation $225 000 - 15% used = $33 750) refer to new completion permit bld2... see more
Valuation:
N/A
Permit #:
BLD2021-00329
Status:
complete
Fee:
N/A
Permit Type:
Simple permit
Building Type:
N/A
Residential new single family dwelling
782 El Pintado Rd, Danville, CA, 94526
2021-07-19
Rsfd 4854 garage 5808 871 cov por w pem *swo*
Valuation:
$1,798,952
Permit #:
B19-013814
Status:
final
Fee:
$13,879
Permit Type:
N/A
Building Type:
N/A
Residential accessory dwelling units (adu)
755 Kirkcrest Rd, Danville, CA, 94526
2025-02-03
Attached adu 700 sf in conjunction with b22-016417
Valuation:
$150,000
Permit #:
B22-016418
Status:
final
Fee:
$4,226
Permit Type:
N/A
Building Type:
N/A
Residential retaining wall
755 Kirkcrest Rd, Danville, CA, 94526
2024-07-11
Ret walls 650lf max 6
Valuation:
$237,000
Permit #:
W22-000717
Status:
final
Fee:
$3,814
Permit Type:
N/A
Building Type:
N/A
Residential accessory structure
755 Kirkcrest Rd, Danville, CA, 94526
2022-08-12
Pool house 686 sf/outdoor kitchen fireplace w/pem
Valuation:
$138,970
Permit #:
B22-016466
Status:
expired
Fee:
$3,864
Permit Type:
N/A
Building Type:
N/A
Residential interior alterations/remodels
51 Mustang Ct, Danville, CA, 94526
2023-07-10
Remodel kitchen remove non-bearing wall/replace 2 doors w/pem
Valuation:
$41,000
Permit #:
B23-017071
Status:
final
Fee:
$1,522
Permit Type:
N/A
Building Type:
N/A
Building/residential/mir/miscellaneous residential
0 The Nines, Lafayette, CA, 94549
2022-09-14
New retaining wall in rear of proposed residence attached to rear patio at lot 9 of subdivision the nines
Valuation:
N/A
Permit #:
BIMIR22-010380
Status:
expired
Fee:
$791
Permit Type:
N/A
Building Type:
N/A
Building permit
20427 Marshall St, Castro Valley, CA, 94546
2019-12-05
Completion permit to bld2017-01686. new units # 22 23 & 24. to convert 9 double open carports to 3 apartments (2 776sf habitable) and 6 single enclosed garages (1 250 sf garage). each apartment willl have 2 bedrooms 2bathrooms kitchen/dining room living room laundry closet 1 car garage. (orig. valuation $225 000 - 40% used = $90 000)
Valuation:
N/A
Permit #:
BLD2019-04347
Status:
complete
Fee:
$0
Permit Type:
Simple permit
Building Type:
N/A
Building permit with plan check
1077 Jacobsen Ln, Petaluma, CA, 94954
2023-01-31
*expedited review* new construction of barn b (6330 sf)
Valuation:
N/A
Permit #:
BLD22-3965
Status:
issued
Fee:
$6,911
Permit Type:
N/A
Building Type:
N/A
Building permit with plan check
1077 Jacobsen Ln, Petaluma, CA, 94954
2023-01-31
*expedited review* new construction of barn a (5828 sf)
Valuation:
N/A
Permit #:
BLD22-3964
Status:
issued
Fee:
$6,873
Permit Type:
N/A
Building Type:
N/A
Building/residential/r/new single family-duplex
2611 Royal Oaks Dr, Alamo, CA, 94507
2018-05-31
Lot a -- 3786 sq ft single family residence -with 677 sq ft attached garage and 659 sq ft covered porches per plan. fire sprinklers required
Valuation:
N/A
Permit #:
BIR18-005581
Status:
final
Fee:
$47,271
Permit Type:
N/A
Building Type:
N/A
Building permit with plan check
1083 Jacobsen Ln, Petaluma, CA, 94954
2023-06-20
New single family dwelling (5495sf) with attached garage(s) (1435sf)
Valuation:
N/A
Permit #:
BLD23-4099
Status:
plancheck
Fee:
$6,324
Permit Type:
N/A
Building Type:
N/A
Building/residential/crc/recreation conditioned building
20 Bevmar Ln, Alamo, CA, 94507
2021-02-10
360 sqft conditioned cabana with bathroom (no kitchen). same plans (bimir20-012664-pavillion)
Valuation:
N/A
Permit #:
BICRC21-001587
Status:
final
Fee:
$4,396
Permit Type:
N/A
Building Type:
N/A

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