Updated: Jul 06, 2026
Location and Projects
Address
P.O.Box 489, De Soto, MO, 63020
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WM. Mahn Plumbing, Inc
WM. Mahn Plumbing, Inc, Desoto, Po Box 489, Desoto, MO (Owned by: Mark Mahn) holds a Plumbing Contractor license and 4 other licenses according to the St. Charles County license board.
Their BuildZoom score of 99 ranks in the top 15% of 23,328 Missouri licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring WM. Mahn Plumbing, Inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
WM. Mahn Plumbing, Inc Services
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WM. Mahn Plumbing, Inc Contact Information
Phone Number: (573) 468-3615
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Address: P.O.Box 489, Desoto, MO 63020
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WM. Mahn Plumbing, Inc Desoto
Quality
99
85th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
WM. Mahn Plumbing, Inc has a BuildZoom score of 99, which places them above 85% of 23,328 contractors in Missouri.
Activity
|
5 projects
|
2025 |
Our building permit records indicate that WM. Mahn Plumbing, Inc has worked on at least
5.0 projects over the past year.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
5 projects
|
Plumbing projects |
Analyzing permits over the last 4 years shows that WM. Mahn Plumbing, Inc mostly works on
plumbing project
projects.
Pricing
|
1 project
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
1 project
|
$50k-$100k |
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 WM. Mahn Plumbing, Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Bio-detention pond for football field. this is under permit # 25prj-00056 and have already been approved
Valuation:
$85,000
Permit #:
25DRN-01937
Status:
complete
Fee:
$211
Permit Type:
Other
Building Type:
N/A
Stl sports - remodel of existing bathroom. please reference building # 25bld-03091
Valuation:
$19,000
Permit #:
25PLU-11504
Status:
complete
Fee:
$245
Permit Type:
Alteration
Building Type:
N/A
Force sewer main repair
Valuation:
N/A
Permit #:
PROW24-0038
Status:
expired
Fee:
$500
Permit Type:
Maintenance/repair
Building Type:
N/A
Bp gas station remodel existing gas station ******this permit does not include the backflow device. it will need to be on a separate permit.*********
Valuation:
$39,000
Permit #:
25PLU-20351
Status:
issued
Fee:
$310
Permit Type:
Alteration
Building Type:
N/A
***please resubmit with the current or future tenant buisness name(not buisness owner name) for this space. if you are doing this on behalf of the property owner please state that it is on behalf od the property owner in the tenant space provided. we can't issue a permit till a tenant is given thank you!!***remodel existing gas station
Valuation:
$39,000
Permit #:
25PLU-20230
Status:
canceled
Fee:
N/A
Permit Type:
Alteration
Building Type:
N/A
Sewer replacement
Valuation:
N/A
Permit #:
PROW25-0030
Status:
triage
Fee:
$500
Permit Type:
Maintenance/repair
Building Type:
N/A
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WM. Mahn Plumbing, Inc Reviews
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Verified License
BuildZoom confirmed this contractor's license
WM. Mahn Plumbing, Inc License info
Verified License
| Status | Active |
| County | St. Charles County |
| Type | Plumbing Contractor |
- BuildZoom verified this license was active as of July 2026.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | P8210 |
| Status | Active |
| County | St Louis County |
| Type | Plumber |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for WM. Mahn Plumbing, Inc at the Saint Louis County Department of Public Works.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | D003533 |
| Status | Active |
| County | St Louis County |
| Type | Drainlayer |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for WM. Mahn Plumbing, Inc at the Saint Louis County Department of Public Works.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | P106 |
| Status | Active |
| County | Jefferson County |
| Type | Plumbing Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2020. Check the current license status of WM. Mahn Plumbing, Inc with the Jefferson County Building Division
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | BL024116 |
| Status | Inactive |
| City | Columbia |
| Type | Plumbing Trade Contractor |
| Class | Plumbing Trade Contractor |
- According to the City of Columbia, 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 WM. Mahn Plumbing, Inc at the City of Columbia.
This is a sample of licensing data; click here to access a complete history.
99
BuildZoom Score
WM. Mahn Plumbing, Inc Employees
MS
Mark A Sullivan
MM
Mark Mahn
Owner
MS
Mark Sullivan