Updated: Jun 24, 2026
Location and Projects
Address
78 TOMLINSON AVE, Plainville, CT, 06062
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Mark Karwowski HVAC/Mechanical Contractor
Mark Karwowski, 78 Tomlinson Ave, Plainville, CT holds a Heating, Piping & Cooling Unlimited Contractor license and 1 other license according to the Connecticut license board.
Their BuildZoom score of 102 ranks in the top 11% of 12,093 Connecticut licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Mark Karwowski, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Mark Karwowski Contact Information
Address: 78 TOMLINSON AVE, Plainville, CT 06062
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Mark Karwowski Plainville
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Mark Karwowski has a BuildZoom score of 102, which places them above 89% of 12,093 contractors in Connecticut.
Activity
|
2 projects
|
2025 |
|
2 projects
|
2024 |
|
8 projects
|
2023 |
Our building permit records indicate that Mark Karwowski has worked on at least
12.0 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
|
10 projects
|
Mechanical projects |
|
7 projects
|
HVAC projects |
Analyzing permits over the last 4 years shows that Mark Karwowski mostly works on
mechanical project
and hvac project
projects.
Pricing
|
9 projects
|
$5k-$20k |
|
1 project
|
$20k-$50k |
The typical size of their permits is approximately $12,000. 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.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Retest existing nat gas lines in order to restore gas meters. repair any split pipes from the wintertime. reroute kitchen baseboards to accommodate new kitchen lay outs. fill test and purge two existing chimney vented natural gas boilers.ref: res-alt-24-000688
Valuation:
$12,500
Permit #:
MISC-MEC-25-000228
Status:
complete
Fee:
$463
Permit Type:
Alteration
Building Type:
Residential
Install new 60k 96% 2 stage propane furnace with 2.5 ton 14 seer2 air conditioning system. new single zone duct system. new propane piping for furnace and kitchen stove (tank installation by others). furnace will be located in new garage mechanical closet. supply and return trunk duct for main floor will be routed through two closets and into the attic using the attic for neccessary f... see more
Valuation:
$15,300
Permit #:
BLD23-00999
Status:
final
Fee:
$263
Permit Type:
N/A
Building Type:
N/A
Demolish and remove existing chimney vented natural gas boiler. install new chimney vented natural gas boiler. utica mgb-095k
Valuation:
$8,000
Permit #:
MISC-MEC-25-000171
Status:
issued
Fee:
$312
Permit Type:
Replacement
Building Type:
Commercial
Install 3 ne wgas boilers all with their own single zone baseboard heating loop. there will be new gas lines for each boiler hot water heater and kitchen stoves. gas pressure test
Valuation:
$38,000
Permit #:
MISC-MEC-22-000042
Status:
complete
Fee:
$1,220
Permit Type:
Replacement
Building Type:
N/A
Install new mitsubishi 18k btu/h ductless hyper heat pump for new finished basement
Valuation:
$6,200
Permit #:
M-24-0297
Status:
issued
Fee:
$125
Permit Type:
Ductless split he...
Building Type:
N/A
Install 3 new lp 96% gas furnace w/split air conditioning system - new duct systems (6 zones total). all venting including erv for fresh air
Valuation:
N/A
Permit #:
BLD-2023-02636
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install two new gas furnace in basement and connect to existing ductwork. new gas lines from meter location to each furnace and one stove per unit
Valuation:
$12,000
Permit #:
MISC-MEC-22-000220
Status:
complete
Fee:
$433
Permit Type:
Replacement
Building Type:
Residential
Install new single zone duct system attaching to existing furnace. re test existing gas piping lines. start and test existing furnace
Valuation:
$9,900
Permit #:
MISC-MEC-23-000065
Status:
complete
Fee:
$373
Permit Type:
Replacement
Building Type:
Residential
Install new heil 90k 80% natural gas furnace with 3 ton 14 seer air conditioning system. new single zone duct system. new gas lines
Valuation:
$18,000
Permit #:
MISC-MEC-23-000214
Status:
issued
Fee:
$615
Permit Type:
Alteration
Building Type:
Residential
Replace existing natural gas furnace with a heil 60, 000 btu input 96% eff. furnace and 36, 000 btu 16 seer air conditioning condenser. model #'s g96vtn0601714a &hsa636gka.reconnect gas piping and electrical
Valuation:
$5,370
Permit #:
20641
Status:
issued
Fee:
N/A
Permit Type:
Boiler/furnace re...
Building Type:
Single family
Rough mechanical for new residence with heil propane furnace
Valuation:
$20,000
Permit #:
23-9M
Status:
expired
Fee:
N/A
Permit Type:
Mechanical subcon...
Building Type:
N/A
Install new heil stage propane furnace and air conditioning two zone system
Valuation:
$17,000
Permit #:
22-75M
Status:
expired
Fee:
N/A
Permit Type:
HVAC: subcontract...
Building Type:
N/A
Install new heil 10k 96% propane furnce with 4-ton 16 seer air conditioning system - new ductwork - 2 zones
Valuation:
$13,000
Permit #:
M-20-367
Status:
final
Fee:
$210
Permit Type:
HVAC/mechanical
Building Type:
N/A
Rough mechanical for new home
Valuation:
$16,000
Permit #:
22-8M
Status:
expired
Fee:
N/A
Permit Type:
HVAC: subcontract...
Building Type:
N/A
Install 2.5 ton split air conditioning system 2 head ductless mini-split & all necessary electrical
Valuation:
$14,500
Permit #:
M-19-210
Status:
final
Fee:
$239
Permit Type:
Air conditioning
Building Type:
N/A
Install american standard 1 1/2 ton 16 seer air conditioning system for new addition
Valuation:
N/A
Permit #:
MP-2020-0073
Status:
final
Fee:
$30
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$12,000
Permit #:
M-23-464
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$11,500
Permit #:
M-23-201
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$13,000
Permit #:
M-21-333
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace gas furnace with heil n8msn0451412a 35000 btu output gas furnace. reconnect ductwork electrical and gas piping
Valuation:
$2,200
Permit #:
M-19-445
Status:
final
Fee:
$43
Permit Type:
Boiler/furnace
Building Type:
N/A
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Mark Karwowski Reviews
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Verified License
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Mark Karwowski License info
Verified License
| License # | HTG.0403465-S1 |
| Status | Active |
| State | Connecticut |
| Type | Heating, Piping & Cooling Unlimited Contractor |
| Date Issued | 09-01-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Mark Karwowski at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
License Not Required
| Status | Not Required |
- BuildZoom verified in February, 2020 that this contractor does not need a license to be a contractor in Connecticut.
This is a sample of licensing data; click here to access a complete history.
102
BuildZoom Score
23
Permits
- Building permit records show that Mark Karwowski has worked on 23 permitted projects.
Mark Karwowski Employees
MK
Mark Karwowski