Updated: May 16, 2026
Location and Projects
Address
P O BOX 20863, El Sobrante, CA, 94820
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RT Mahnken Construction
RT Mahnken Construction at P O BOX 20863, El Sobrante, CA 94820, held a General Contractor license (#350582) with the California contractors license board with an expiration date of 03-01-2011. We last verified the license was inactive on 05-15-2026.
Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.
If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our project planner to be easily matched to qualified, licensed professionals in your area.
RT Mahnken Construction Services
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RT Mahnken Construction Contact Information
Phone Number: (510) 223-6875
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Address: P O BOX 20863, El Sobrante, CA 94820
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Building Permits by RT Mahnken Construction
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace 19 windows(same sizes & locations) replace existing central heater install subpanel in basement to include completion of expired permit e 405619 ---- (replace/upgrade main electrical service to 200amp re-wire all existing receptacles & fixtures and abandon old knob-n-tube wiring)
Valuation:
N/A
Permit #:
BI412391
Status:
final
Fee:
$250
Permit Type:
N/A
Building Type:
N/A
Shower repair/plumbing
Valuation:
N/A
Permit #:
BIRP0000208208
Status:
final
Fee:
$101
Permit Type:
N/A
Building Type:
N/A
Retile bathroom and shower
Valuation:
N/A
Permit #:
BIRP0000212104
Status:
final
Fee:
$56
Permit Type:
N/A
Building Type:
N/A
Shower repair/plumbing
Valuation:
N/A
Permit #:
BIRP0000213689
Status:
final
Fee:
$101
Permit Type:
N/A
Building Type:
N/A
Building/residential/r/new single family-duplex
1999-03-18
Single family residence w/garage
Valuation:
N/A
Permit #:
BIR0000233880
Status:
final
Fee:
$4,551
Permit Type:
N/A
Building Type:
N/A
Water heater
Valuation:
N/A
Permit #:
BIPL0000228685
Status:
final
Fee:
$56
Permit Type:
N/A
Building Type:
N/A
Rrem hall bathroom remodel (no structural improvements)
Valuation:
$4,000
Permit #:
CONV97-0659
Status:
issued
Fee:
$242
Permit Type:
B p e
Building Type:
N/A
Reroof
Valuation:
$2,100
Permit #:
BIRR0000168279
Status:
Finaled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Rrem replace tile in shower replace pan
Valuation:
$2,100
Permit #:
CONV01-0533
Status:
issued
Fee:
$135
Permit Type:
B p
Building Type:
N/A
Demolish exist house
Valuation:
N/A
Permit #:
BID0000233879
Status:
final
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Rre
Valuation:
$3,000
Permit #:
CONV95-0158
Status:
issued
Fee:
$97
Permit Type:
B
Building Type:
N/A
Rrem remove existing shower stall and replace (main bath)
Valuation:
$1,700
Permit #:
CONV97-1102
Status:
issued
Fee:
$141
Permit Type:
B p
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
B98-00037
Status:
final
Fee:
$152
Permit Type:
N/A
Building Type:
N/A
Renew renew permit no. 94 0728 for final inspection
Valuation:
N/A
Permit #:
CONV95-0867
Status:
issued
Fee:
$52
Permit Type:
B
Building Type:
N/A
Deck construct deck per drawings submitted
Valuation:
$4,000
Permit #:
CONV94-0728
Status:
issued
Fee:
$250
Permit Type:
B
Building Type:
N/A
Rrem replace tub and install surround
Valuation:
$1,300
Permit #:
CONV98-0547
Status:
issued
Fee:
$132
Permit Type:
B p
Building Type:
N/A
Replace 4 windows and 1 patio door
Valuation:
$3,800
Permit #:
BD09-0587
Status:
final
Fee:
$330
Permit Type:
Repair
Building Type:
N/A
Replace tile in tub in shower
Valuation:
$8,500
Permit #:
BD08-1185
Status:
final
Fee:
$330
Permit Type:
Repair
Building Type:
N/A
Rrem
Valuation:
$300
Permit #:
CONV98-0466
Status:
issued
Fee:
$71
Permit Type:
B
Building Type:
N/A
Rrem
Valuation:
$11,200
Permit #:
CONV98-0454
Status:
issued
Fee:
$397
Permit Type:
B p e
Building Type:
N/A
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RT Mahnken Construction Reviews
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RT Mahnken Construction License info
Inactive License
| License # | 350582 |
| Status | Inactive |
| State | California |
| Type | General Building, Painting And Decorating, Tile (Ceramic And Mosaic) |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for RT Mahnken Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
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- *No active license on file. If you are RT Mahnken Construction, click “This is My Business” to update your information.
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $12,500 |
17
Permits
- Building permit records show that RT Mahnken Construction has worked on 17 permitted projects.
RT Mahnken Construction Employees
RM
Richard Tarr Mahnken
Sole Owner