Updated: Jul 14, 2026
Location and Projects
Address
112 S William ST MT, Mount Prospect, IL, 60056
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A1 Plumbingsystem,inc
A1 Plumbingsystem,inc, 112 S William St Mt, Prospect, IL (Owned by: Miroslaw Nalepka) holds a Sewer Contractor Registration license and 11 other licenses according to the Palatine license board.
Their BuildZoom score of 102 ranks in the top 11% of 65,686 Illinois licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring A1 Plumbingsystem,inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
A1 Plumbingsystem,inc Services
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A1 Plumbingsystem,inc Contact Information
Phone Number: (773) 424-8225
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Address: 112 S William ST MT, Prospect, IL 60056
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A1 Plumbingsystem,inc Prospect
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
A1 Plumbingsystem,inc has a BuildZoom score of 102, which places them above 89% of 65,686 contractors in Illinois.
Activity
|
3 projects
|
2025 |
|
9 projects
|
2024 |
|
9 projects
|
2023 |
Our building permit records indicate that A1 Plumbingsystem,inc has worked on at least
21.0 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 |
|
20 projects
|
Plumbing projects |
Analyzing permits over the last 4 years shows that A1 Plumbingsystem,inc mostly works on
plumbing project
and home addition
projects.
Pricing
|
3 projects
|
< $5k |
|
2 projects
|
$5k-$20k |
|
3 projects
|
$50k-$100k |
|
1 project
|
$100k-$250k |
|
4 projects
|
$500k-$1mil |
The typical size of their permits is approximately $92,400. 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 A1 Plumbingsystem,inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Spr 2019 cbc. new two story frame (va construction type and r-5 occupancy) single family residence with basement covered open entry porch and rear one story frame addition - mud room. new three car frame garage with rooftop deck. 250 lf of 6 ft high wood fence. all work as per plans.building to be equipped throughout with automatic sprinkler system installed with accordance with secti... see more
Valuation:
$550,000
Permit #:
101051371
Status:
issued
Fee:
$2,959
Permit Type:
N/A
Building Type:
N/A
Spr 2019 cbc. new two story frame (va construction type and r-5 occupancy) single family residence with basement and open front frame porch. new two car frame garage with rooftop deck and attached fireplace. 220 lf of 6 ft high wood fence. all work as per plans
Valuation:
$650,000
Permit #:
101038835
Status:
complete
Fee:
$2,925
Permit Type:
N/A
Building Type:
N/A
Rs-3 3031 n honore st. proposed2 story single family residence w/basement and roof deck/enclosure front stairs rear porch 6 wood fence and driveway leading to 2 car attached garage per plans. approved 10.21.2024
Valuation:
$500,000
Permit #:
101042237
Status:
issued
Fee:
$2,925
Permit Type:
N/A
Building Type:
N/A
Repair or in-kind replacement of 3 plumbing fixtures as described in permit application. includes repair or replacment of plumbing piping. locations: 0 residential unit(s) 0 non-residential unit(s) 1 interior common areas basement
Valuation:
$1,500
Permit #:
B200410769
Status:
issued
Fee:
$175
Permit Type:
plumbing work
Building Type:
N/A
Repair or in-kind replacement of 1 plumbing fixtures as described in permit application. includes repair or replacment of plumbing piping. locations: 0 residential unit(s) 1 non-residential unit(s) bar area violations
Valuation:
$3,000
Permit #:
B200419968
Status:
issued
Fee:
$1,475
Permit Type:
plumbing work
Building Type:
N/A
Spr 2019 cbc. new two story frame (va construction type and r-5 occupancy) single family residence with basement and rear one story frame addition - mud room. new two car frame garage with rooftop deck. 220 lf of 6 ft high wood fence. all work as per plans
Valuation:
$550,000
Permit #:
101033870
Status:
complete
Fee:
$4,178
Permit Type:
N/A
Building Type:
N/A
Self cert 2019 cbrc: selective interior & exterior alterations and porch addition to an existing two story frame single family residence (group r-5 const. va)
Valuation:
$550,000
Permit #:
101051714
Status:
issued
Fee:
$645
Permit Type:
N/A
Building Type:
N/A
Spr 2019 cbc.new two story frame single family residence with new basement (va construction r-5 occupancy) new front frame porch. new rear wood deck. new two car frame garage. all work as per plans
Valuation:
$180,000
Permit #:
101015604
Status:
issued
Fee:
$3,065
Permit Type:
N/A
Building Type:
N/A
Spr 2019 cbc: remove existing frame garage and construct a new 500.54 sf brick garage with a roof deck and stair and rework the existing fence to accommodate the new garage. no work to the existing 2-story residential building under this permit. (occupancy groups r-5 type iib) construction)
Valuation:
$65,000
Permit #:
101010931
Status:
expired
Fee:
$850
Permit Type:
N/A
Building Type:
N/A
Repair or in-kind replacement of 15 plumbing fixtures as described in permit application. includes repair or replacment of plumbing piping. includes repair or replacement of plumbing risers in existing chases. locations: 3 residential unit(s) 0 non-residential unit(s) 1 interior common areas 1st 2nd and 3rd floors
Valuation:
$15,200
Permit #:
B200014064
Status:
complete
Fee:
$1,225
Permit Type:
plumbing work
Building Type:
N/A
Repair or in-kind replacement of 12 plumbing fixtures as described in permit application. repair or in-kind replacement of hot water heater(s). includes repair or replacment of plumbing piping. locations: 1 residential unit(s) 0 non-residential unit(s) basement 1st fl kitchen cab replace tiling dryall
Valuation:
$12,500
Permit #:
B200017112
Status:
complete
Fee:
$225
Permit Type:
plumbing work
Building Type:
N/A
Repair or in-kind replacement of 0 plumbing fixtures as described in permit application. includes repair or replacment of plumbing piping. locations: 0 residential unit(s) 0 non-residential unit(s) 1 interior common areas basement area
Valuation:
$5,000
Permit #:
B200401805
Status:
complete
Fee:
$175
Permit Type:
plumbing work
Building Type:
N/A
Self cert project - interior work only interior remodeling and alterations of an existing fire damaged two story with basement 2 du building as per plans (construction type 3a occupancy r-5)
Valuation:
$100,000
Permit #:
101037796
Status:
complete
Fee:
$750
Permit Type:
N/A
Building Type:
N/A
Self cert project: interior work only interior remodeling and alterations of an existing fire damaged two story with basement 2 du building as per plans (construction type 3a occupancy r-5)
Valuation:
$100,000
Permit #:
101037363
Status:
complete
Fee:
$985
Permit Type:
N/A
Building Type:
N/A
For permit 101050179: replacement plumbing contractor. new contractor(s) listed under other applicants and contractors on permit certificate
Valuation:
N/A
Permit #:
B200407516
Status:
complete
Fee:
$100
Permit Type:
Administrative ch...
Building Type:
N/A
Spr 2019 cbc: interior non structure demolition on level 3 all units on level 4 units 4a 4b and 4d on an existing residential building
Valuation:
$92,400
Permit #:
101018251
Status:
phased permitting
Fee:
$575
Permit Type:
N/A
Building Type:
N/A
Repair/replace drywall (2000 sq ft unit) replace 160 windows replace cast iron drains & galvanized supply lines install plumbing fixture and pipe repair and installation (work in 3 units only - 1, 2, 3 north) separate electrical permit req'd plans req'd for ductwork and furnace; *subject to field inspections*
Valuation:
$15,000
Permit #:
100919576
Status:
issued
Fee:
$2,125
Permit Type:
N/A
Building Type:
N/A
Interior alterations including plumbing hvac and electrical. masonry repairs and tuckpointing. repair rear frame porch as needed. metal fence under permit # 100890041. all work as per plans.**certified corrections subject to field inspections & audit **
Valuation:
$120,000
Permit #:
100888111
Status:
complete
Fee:
$944
Permit Type:
N/A
Building Type:
N/A
Spr 2019 crbc: second floor addition over existing single family home with basement interior remodeling( construction type 5a occupancy group r-5)
Valuation:
$70,000
Permit #:
101009669
Status:
complete
Fee:
$875
Permit Type:
N/A
Building Type:
N/A
Fences: 25ft in x 6ft in: qty 1 windows (replacement only): qty 11 doors (replacement only): qty 16 furnace (replacement only): qty 3 hot water heater (replacement only): qty 1
Valuation:
$20,000
Permit #:
100920895
Status:
issued
Fee:
$1,100
Permit Type:
N/A
Building Type:
N/A
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A1 Plumbingsystem,inc Reviews
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Verified License
BuildZoom confirmed this contractor's license
A1 Plumbingsystem,inc License info
Verified License
| License # | CON-009170-2026 |
| Status | Active |
| Town | Palatine |
| Type | Sewer Contractor Registration |
| Class | Sewer |
| Date Issued | 01-13-2026 |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for A1 Plumbingsystem,inc at the Village of Palatine Registered Contractors.
This is a sample of licensing data; click here to access a complete history.
Verified License
| Status | Active |
| County | Cook County |
| Type | Sewer |
| Date Issued | 02-27-2026 |
- 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
| Status | Active |
| County | Cook County |
| Type | Water |
| Date Issued | 02-27-2026 |
- 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
| Status | Active |
| County | Cook County |
| Type | Plumbing |
| Date Issued | 02-27-2026 |
- 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 # | SBC198281 |
| Status | Active |
| City | City Of Chicago |
| Type | Plumbing Contractor |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for A1 Plumbingsystem,inc at the City of Chicago Data Portal.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | CL-3515 |
| Status | Active |
| Town | Bartlett |
| Type | {U'license Type': U'plumbing'} |
- When BuildZoom last verified this license, it had an expiration date of December, 2024. Check the current license status of A1 Plumbingsystem,inc with the Contractors Licensed in Bartlett
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CR-8704 |
| Status | Inactive |
| Type | Contractor Registration |
- According to the local 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.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 19LIPL-0106 |
| Status | Inactive |
| City | Evanston |
| Type | Plumbing |
- According to the City of Evanston Building and Inspection 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.
Check this license's status for A1 Plumbingsystem,inc at the City of Evanston Building and Inspection Services.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CL-2229 |
| Status | Inactive |
| Town | Bartlett |
| Type | {U'license Type': U'plumbing'} |
- According to the Contractors Licensed in Bartlett, 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 A1 Plumbingsystem,inc at the Contractors Licensed in Bartlett.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | City Of Chicago |
| Type | Bonded Contractor |
- According to the City of Chicago Data Portal, 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 # | 19LIPL-0106 |
| Status | Inactive |
| City | Evanston |
| Type | Plumbing |
- According to the City of Evanston Building and Inspection 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.
Check this license's status for A1 Plumbingsystem,inc at the City of Evanston Building and Inspection Services.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | City Of Chicago |
| Type | Bonded Contractor |
- According to the City of Chicago Data Portal, 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.
102
BuildZoom Score
34
Permits
- Building permit records show that A1 Plumbingsystem,inc has worked on 34 permitted projects.
A1 Plumbingsystem,inc Employees
AI
A1 Plumbing System Inc
Licensee
MN
Miroslaw Nalepka
Owner