Updated: May 28, 2026
Location and Projects
Address
79-51 COOPER AVENUE, Glendale, NY, 11385
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Welkin Mechanical, LLC
Welkin Mechanical, LLC, 79-51 Cooper Ave, Glendale, NY (Owned by: Stephen Lynch Jr) holds a Fire Suppression Contractor B license and 5 other licenses according to the New York license board.
Their BuildZoom score of 113 ranks in the top 3% of 77,888 New York licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Welkin Mechanical, LLC, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Welkin Mechanical, LLC Contact Information
Phone Number: (718) 643-6055
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Address: 79-51 COOPER AVENUE, Glendale, NY 11385
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Welkin Mechanical, LLC Glendale
Quality
113
97th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Welkin Mechanical, LLC has a BuildZoom score of 113, which places them above 97% of 77,888 contractors in New York.
Activity
|
29 projects
|
2025 |
|
25 projects
|
2024 |
|
24 projects
|
2023 |
Our building permit records indicate that Welkin Mechanical, LLC has worked on at least
78.0 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
|
3 projects
|
New Constructions |
|
8 projects
|
Mechanical projects |
|
6 projects
|
HVAC projects |
Analyzing permits over the last 4 years shows that Welkin Mechanical, LLC mostly works on
mechanical project
and hvac project
projects.
Pricing
|
5 projects
|
< $5k |
|
10 projects
|
$5k-$20k |
|
11 projects
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
7 projects
|
$100k-$250k |
|
3 projects
|
$250k-$500k |
|
9 projects
|
$500k-$1mil |
|
4 projects
|
$1mil+ |
The typical size of their permits is approximately $112,500. 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 Welkin Mechanical, LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Interior removal & building out for hvac system & related piping as shown on drawings. full en package filed in bis application # 340725941. no change in use egress or occupancy
Valuation:
$187,328,440
Permit #:
B00450211-I1-MS
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Ps-284 clearview pump station reconstruction foundation work includes concrete work associated with construction of a new above grade pump station building plus full below grade restoratoin of the exisitng main pump s tation wetwell and valve vault
Valuation:
$7,215,064
Permit #:
Q00825984-I1-FO
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Removal relocation and installation of associated piping in order to extend the siamese connection to accommodate interim sally port as shown on drawings filed herewith. no change in use egress or occupancy under this application. contd. in comments
Valuation:
$125,000
Permit #:
M01114217-I1-EW-SD
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Ps-284 clearview pump station reconstruction structural work includes concrete and roofing work associated with a new above grade pump station building plus full below grade restoratoin of the exisitng main pump station wetwell and valve vault
Valuation:
$7,215,064
Permit #:
Q00636154-I1-ST
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Ps-284 clearview pump station reconstruction hvac work includes new hvac equipment (exhaust fans supply fans associated ducting air conditioning and unit heaters) for new above grade pump station building and below grade restored main pump station
Valuation:
$658,616
Permit #:
Q00636144-I1-MS
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Hvac system installation contract ti-168 to rehabilitate & upgrade the headworks of the tallman island wrrf. systems comprise of heating & ventilation units exhaust fans hot water coils hydronic pumps/piping ductwork standby generator controls
Valuation:
$2,000,000
Permit #:
Q00345017-I1-MS
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Filing herewith for sanitary water service and storm piping with fixtures for pump station building and surrounding area as per plans. no change in use egress or occupancy under this application. filed in conjunction with nb# s00500812
Valuation:
$701,760
Permit #:
S00877177-I1-PL
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Filing herewith for sanitary and storm piping with fixtures for electrical building and surrounding area as per plans. no change in use egress or occupancy under this application. filed in conjunction with nb# s00500799
Valuation:
$701,760
Permit #:
S00877060-I1-PL
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Herewith filing for the installation of a small wall mounted erv-1 unit and motorized shut off dampers and ductwork as per the drawings. no change in use egress or occupancy
Valuation:
$228,000
Permit #:
B00907124-S1-MS
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Filing herewith for sanitary and storm piping with fixtures for coned building and surrounding area as per plans no change in use egress or occupancy under this application. filed in conjunction with nb# s00500782
Valuation:
$701,760
Permit #:
S00876836-I1-PL
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Removal relocation and installation of associated piping in order to extend the siamese connection to accommodate interim sally port as shown on drawings filed herewith. no change in use egress or occupancy under this application
Valuation:
$250,000
Permit #:
M00759162-I1-EW-SD
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of temporary chimney 8 steam 2.5 condensate and 1make-up water piping to connect temporary mobile boiler trailer and existing heating plant located in the boiler room of the building. no change in use egress or occupancy
Valuation:
$30,000
Permit #:
B00761103-S2-MS
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Ps-284 clearview pump station reconstruction includes construction of a new building envelope to house new electrical and mechanical equipment and site restoration
Valuation:
$12,097,042
Permit #:
Q00643658-I1-GC
Status:
approved
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Removal and installation of plumbing fixtures and related piping for interim sally port as shown on drawings filed herewith. no change in use egress or occupancy under this application
Valuation:
$250,000
Permit #:
M00747072-I1-PL
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Sprinkler work including removal of 32 existing sprinkler heads & installation of 33 new sprinkler heads and new plumbing work as per plans filed herewith. no change in egress use or occupancy
Valuation:
$86,500
Permit #:
Q01224370-S4-EW-SP
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Removal and installation of hvac system for interim sally port as shown on drawings filed herewith. no change in use egress or occupancy under this application
Valuation:
$250,000
Permit #:
M00747037-I1-MS
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of mechanical equipment related piping and related ductwork. removal of heating pipes radiators as shown on drawings filed herewith. no changes in use egress or occupancy
Valuation:
$200,000
Permit #:
M00712589-I1-MS
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Sprinkler work including relocation of 19 existing sprinkler heads & installation of 1 new sprinkler head. remove domestic water & sanitary fixtures & associated pipework. no change to egress use or occupancy
Valuation:
$22,500
Permit #:
Q01145396-S2-EW-SP
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Provide domestic piping for water heater and associated plumbing fixtures. sanitary piping for associated plumbing fixtures. storm drainage piping for roof drains. make-up water connections to hydronic systems
Valuation:
$580,000
Permit #:
X00430118-I1-PL
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install temporary fire standpipe pressurized alarm system for building being demolished under dm#m00974121-i1. cut/cap standpipe riser floor by floor as building is being demolished. no change to use egress or occupancy filed under this sd application
Valuation:
$30,000
Permit #:
M01144615-I1-EW-SD
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Welkin Mechanical, LLC License info
Verified License
| License # | 000297 |
| Status | Active |
| State | New York |
| Type | Fire Suppression Contractor B |
- BuildZoom verified this license was active as of November 2025.
Verify this license's status for Welkin Mechanical, LLC at the New York City Department of Buildings.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 001406 |
| Status | Active |
| State | New York |
| Type | Plumber |
| Date Issued | 02-21-2026 |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Welkin Mechanical, LLC at the New York City Department of Buildings.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 028337 |
| Status | Active |
| State | New York |
| Type | Superintendent Of Construction |
- When BuildZoom last verified this license, it had an expiration date of August, 2025. Check the current license status of Welkin Mechanical, LLC with the New York City Department of Buildings
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 612208 |
| Status | Active |
| State | New York |
| Type | Gc Safety Registration, Gc Safety Registration, Gc Safety Registration |
- When BuildZoom last verified this license, it had an expiration date of March, 2023. Check the current license status of Welkin Mechanical, LLC with the New York City Department of Buildings
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 49988 |
| Status | Active |
| County | Suffolk County |
| Type | Mp N/A |
- When BuildZoom last verified this license, it had an expiration date of March, 2017. Check the current license status of Welkin Mechanical, LLC with the Suffolk County Department of Consumer Affairs
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 025038 |
| Status | Inactive |
| State | New York |
- According to the New York City Department of Buildings, 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 Welkin Mechanical, LLC at the New York City Department of Buildings.
This is a sample of licensing data; click here to access a complete history.
113
BuildZoom Score
Insured
| Insurer | Ace American Insurance Co |
Insured
| Workers Comp Provider | Ace American Insurance Co |
190
Permits
- Building permit records show that Welkin Mechanical, LLC has worked on 190 permitted projects.
Welkin Mechanical, LLC Employees
SL
Stephen F Lynch
Owner
SL
Stephen Lynch
Owner
SJ
Stephen Lynch Jr
Owner