Updated: Jul 30, 2026
Location and Projects
Address
1253 GROVER RD., St Louis, MO, 63125
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R. Mertens Service HVAC/Mechanical Contractor
R. Mertens Service Inc, 1253 Grover Rd, St Louis, MO (Owned by: Mark Mertens) holds a Mechanical license and 9 other licenses according to the St Louis County license board.
Their BuildZoom score of 103 ranks in the top 10% of 23,328 Missouri licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring R. Mertens Service Inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
R. Mertens Service Inc Contact Information
Phone Number: (314) 845-1500
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Address: 1253 GROVER RD., St Louis, MO 63125
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R. Mertens Service Inc St Louis
Quality
103
90th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
R. Mertens Service Inc has a BuildZoom score of 103, which places them above 90% of 23,328 contractors in Missouri.
Activity
|
10 projects
|
2025 |
|
6 projects
|
2024 |
|
6 projects
|
2023 |
Our building permit records indicate that R. Mertens Service Inc has worked on at least
22.0 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.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
4 projects
|
Home Additions |
|
3 projects
|
New Constructions |
|
18 projects
|
Mechanical projects |
|
10 projects
|
HVAC projects |
Analyzing permits over the last 4 years shows that R. Mertens Service Inc mostly works on
mechanical project
and hvac project
projects.
Pricing
|
2 projects
|
< $5k |
|
9 projects
|
$5k-$20k |
|
5 projects
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
2 projects
|
$100k-$250k |
The typical size of their permits is approximately $12,225. 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 R. Mertens Service Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
***notified permit 24mec-04248.***chick fil a - installation of 2 ice machines with remote condensers mounted on the roof 23-bld-02190 2 ice machines model: hmf1810rbt serial number: r31616-053 24 model: hmf1810rbt serial number: r08084-270 23 2 remote condenser for ice machines model: mhhz0303c serial number: 2401423316 model: mhhz0303c serial number: 2401422525
Valuation:
$12,800
Permit #:
24MEC-04194
Status:
canceled
Fee:
N/A
Permit Type:
Alteration
Building Type:
N/A
St louis county catholic church - replacement of 3 rooftop units for the gym
Valuation:
$133,000
Permit #:
25MEC-06373
Status:
issued
Fee:
$237
Permit Type:
Replacement
Building Type:
N/A
Sav-on liquor -installation of refrigeration systems for 3 walk-in coolers
Valuation:
$28,000
Permit #:
25MEC-01518
Status:
complete
Fee:
$319
Permit Type:
Interior finish
Building Type:
N/A
Chick fil a-refrigeration piping and 2 new ice machines 16-mec-01458 has been voided by doug miller these are new machines and equipment is covered under scope of work-------------chick fil a - installation of 2 ice machines with remote condensers mounted on the roof 23-bld-02190 2 ice machines model: hmf1810rbt serial number: r31616-053 24 model: hmf1810rbt serial number: r08084-270 ... see more
Valuation:
$12,800
Permit #:
24MEC-04248
Status:
complete
Fee:
$260
Permit Type:
Replacement
Building Type:
N/A
Adding an approx 20 x 40 single story addition to back of house. concrete footing/frost wall crawlspace with kitchen in addition. small remodel of interior living space
Valuation:
$150,000
Permit #:
22BLD-06123
Status:
complete
Fee:
$854
Permit Type:
Addition
Building Type:
N/A
Increase masters bathroom floor size tenant improvement include previous closet space. add non load bearing frame and drywall to enclose bathroom by 18 sq ft. no electric present in wal l
Valuation:
$7,000
Permit #:
22BLD-06425
Status:
complete
Fee:
$203
Permit Type:
Interior finish
Building Type:
N/A
Replacement of gas furnace and condensing unit
Valuation:
$6,240
Permit #:
25MEC-00431
Status:
complete
Fee:
$79
Permit Type:
Replacement
Building Type:
N/A
(npr) replacement of hydronic heating boiler
Valuation:
$90,000
Permit #:
ME25-000358
Status:
complete
Fee:
N/A
Permit Type:
Commercial altera...
Building Type:
N/A
Pink nails-replacement of two york 5 ton rooftop units with gas heat with the same units
Valuation:
$18,880
Permit #:
23MEC-01826
Status:
filed
Fee:
$158
Permit Type:
Replacement
Building Type:
N/A
(spirit lexus) install oil and compressed air piping
Valuation:
$110,000
Permit #:
24MEC-07392
Status:
issued
Fee:
$861
Permit Type:
New construction
Building Type:
N/A
Vacant-installation of 4 ductless split system and 1 gas furnace
Valuation:
$33,420
Permit #:
25MEC-08394
Status:
complete
Fee:
$395
Permit Type:
Replacement
Building Type:
N/A
Glendale presbyterian-replacement of existing boiler with 3 high efficiency gas boilers
Valuation:
$46,500
Permit #:
24MEC-09218
Status:
complete
Fee:
$237
Permit Type:
Replacement
Building Type:
N/A
Csf reconditioning center reference 25-bld-04601 automotive exhaust system
Valuation:
$33,420
Permit #:
25MEC-09169
Status:
issued
Fee:
$342
Permit Type:
New construction
Building Type:
N/A
Replacement of the furnace and condensing unit
Valuation:
$8,090
Permit #:
23MEC-00445
Status:
issued
Fee:
$79
Permit Type:
Replacement
Building Type:
N/A
Ckick-fil-a - installation of 3 ice machines
Valuation:
$6,872
Permit #:
25MEC-06372
Status:
complete
Fee:
$246
Permit Type:
New construction
Building Type:
N/A
Undefined - e-permit
Valuation:
N/A
Permit #:
AMD-LP-007585
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel kitchen laundry & master bathroom
Valuation:
$70,000
Permit #:
21BLD-00173
Status:
complete
Fee:
$398
Permit Type:
Alteration
Building Type:
N/A
New backflow for steam cabinet (the reviere)
Valuation:
$600
Permit #:
22PLU-17895
Status:
complete
Fee:
$79
Permit Type:
Interior finish
Building Type:
N/A
Replacement of furnace and condensing unit
Valuation:
$8,240
Permit #:
22MEC-07855
Status:
complete
Fee:
$79
Permit Type:
Replacement
Building Type:
N/A
Replacement of furnace and condensing unit
Valuation:
$7,585
Permit #:
22MEC-02699
Status:
complete
Fee:
$79
Permit Type:
Replacement
Building Type:
N/A
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BZ Score
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Avg Project
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BZ Score
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Avg Project
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License #
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BZ Score
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Verified License
BuildZoom confirmed this contractor's license
R. Mertens Service Inc License info
Verified License
| License # | X0048 |
| Status | Active |
| County | St Louis County |
| Type | Mechanical |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for R. Mertens Service 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 # | H8162 |
| Status | Active |
| County | St Louis County |
| Type | Mas Pipefitter |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for R. Mertens Service 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
| Status | Active |
| County | St. Charles County |
| Type | Mechanical |
- BuildZoom verified this license was active as of July 2026.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | MEC6752932 |
| Status | Active |
| City | University City |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of April, 2020. Check the current license status of R. Mertens Service Inc with the City of University City
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | MEC6752932 |
| Status | Active |
| City | University City |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2024. Check the current license status of R. Mertens Service Inc with the City of University City
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| Status | Active |
| County | St Louis County |
| Type | Process Piping Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2020. Check the current license status of R. Mertens Service Inc with 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
| Status | Active |
| County | St Louis County |
| Type | Pipe Fitter |
- When BuildZoom last verified this license, it had an expiration date of December, 2020. Check the current license status of R. Mertens Service Inc with 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
| Status | Active |
| County | St Louis County |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2020. Check the current license status of R. Mertens Service Inc with the Saint Louis County Department of Public Works
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| County | St. Charles County |
| Type | Hvacr Contractor (Class A) |
- According to the St. Charles County Department of Development & Business Services, 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.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | M174 |
| Status | Inactive |
| County | Jefferson County |
| Type | Mechanical Contractor |
- According to the Jefferson County Building Division, 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 R. Mertens Service Inc at the Jefferson County Building Division.
This is a sample of licensing data; click here to access a complete history.
103
BuildZoom Score
126
Permits
- Building permit records show that R. Mertens Service Inc has worked on 126 permitted projects.
R. Mertens Service Inc Employees
MM
Mark Mertens
Owner
MM
Matt Mertens
MM
Matthew Mertens