Updated: Jun 10, 2026
Location and Projects
Address
217 BERLIN AVE, Southington, CT, 06489
Use our bidding system to
request a quote
William J Carlson HVAC/Mechanical Contractor
William J Carlson, 217 Berlin Ave, Southington, CT (Employee: William Carlson) holds a Heating, Piping & Cooling Unlimited Contractor license according to the Connecticut license board.
Their BuildZoom score of 95 ranks in the top 22% of 12,093 Connecticut licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring William J Carlson, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
William J Carlson Contact Information
Address: 217 BERLIN AVE, Southington, CT 06489
Edit
Do you work for this business? Unlock this free profile to update company info and see who's viewing your profile.
William J Carlson Southington
Quality
95
78th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
William J Carlson has a BuildZoom score of 95, which places them above 78% of 12,093 contractors in Connecticut.
Activity
|
2 projects
|
2023 |
Our building permit records indicate that William J Carlson has worked on at least
2.0 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.
Pricing
|
2 projects
|
$5k-$20k |
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.
Misc gas piping and new gas line from new outside meter and gas line installed to existing fireplace. no gas appliance at this must be permitted for installation
Valuation:
$1,500
Permit #:
G-21-11
Status:
complete
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
The removal and disposal of the old furnace flue and air conditioning equipment and the installation of one (1) american standard #s9v2b060u3psaa - 96% efficient* two- stage gas fired direct vent 2 pipe sealed combustion warm air furnace complete with hot surface igniter two-stage gas burner “variable speed” blower motor for air conditioning we will install (1) american standard #4a7a... see more
Valuation:
$7,850
Permit #:
16167
Status:
issued
Fee:
N/A
Permit Type:
Boiler/furnace re...
Building Type:
Single family
We will replace existing boiler with (1) weil mclain gv90-4 91% eff gas cast iron sealed combustion dv boiler. wei will install aluminum chimney liner for exsiting gas hot water heater. net btu/capacity: 97k/105k
Valuation:
$9,850
Permit #:
M-23-61
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$8,800
Permit #:
M-22-425
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$9,500
Permit #:
M-22-373
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$8,000
Permit #:
M-22-199
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$7,500
Permit #:
M-22-34
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace wh with stat gsx50 50 gallon gas wh in enclosed drain pan with float switch & electrical solenoid saftey shut off valve. must meet 2009 irc iecc along with ct amendments
Valuation:
$2,500
Permit #:
M-16-312
Status:
issued
Fee:
$54
Permit Type:
Water heater
Building Type:
Residential improved
Air conditioning replacement - main house amstd one stage 16 seer r4103ton condensor w/spacepak air handler. cooling loads provided. must meet 2009 irc iecc along with ct amendments
Valuation:
$6,250
Permit #:
M-16-311
Status:
issued
Fee:
$110
Permit Type:
Air conditioning
Building Type:
Residential improved
No Description Available
Valuation:
$8,950
Permit #:
M-21-387
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$5,900
Permit #:
M-21-257
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remove oil boiler & replace w/gas steam burnham boiler pin4sni-me2 82.2 % of cast iron. replace chimney liner. must meet 2012 irc iecc along with amendments
Valuation:
$6,500
Permit #:
M-17-56
Status:
issued
Fee:
$109
Permit Type:
HVAC
Building Type:
Residential improved
Boiler replacement of burnham pv83wt 83% oil fired cast iron boiler net btu-100k capacity-131k. must meet 2012 irc iecc along with amendments. heatloss provided
Valuation:
$4,800
Permit #:
M-17-54
Status:
issued
Fee:
$81
Permit Type:
HVAC
Building Type:
Residential improved
Wh replacement w/state gs6-50-ybrs, 50 gal gas wh enclosed in drain pan w/pan sensor switch & solenoid. shut off water valve w/alarm. must meet 2012 irc, iecc along with amendments
Valuation:
$1,150
Permit #:
P-17-50
Status:
issued
Fee:
$39
Permit Type:
Plumbing
Building Type:
Residential Improved
Replace existing oil boiler with a williamson-thermoflo cast iron oil boiler owt-3 85 %. musat meet 2012 irc iecc along with amendments. heatloss provided
Valuation:
$4,800
Permit #:
M-17-53
Status:
issued
Fee:
$81
Permit Type:
HVAC
Building Type:
Residential improved
Replace existing wh w/superstor ssu-80 80 gallon indirect fired stainless steel hw storage tank. must meet 2012 irc iecc along with amendments
Valuation:
$2,900
Permit #:
M-17-55
Status:
issued
Fee:
$53
Permit Type:
HVAC
Building Type:
Residential improved
Replace wh w state 55 gallon electric water heater in an enclosed drain pan. must meet 2012 irc iecc along with ct amendments
Valuation:
$1,250
Permit #:
M-16-404
Status:
issued
Fee:
$40
Permit Type:
Water heater
Building Type:
Residential improved
Furnace & air conditioning replacement. heatloss provided. must 2003 imc 2009 iecc along with ct amendments. (no eq listed on application.)
Valuation:
$6,800
Permit #:
M-16-144
Status:
issued
Fee:
$110
Permit Type:
HVAC
Building Type:
Commercial building
Gas boiler replacement. heatloss provided. must meet 2009 irc iecc along with ct amendments. (no eq listed on application)
Valuation:
$5,900
Permit #:
M-16-145
Status:
issued
Fee:
$96
Permit Type:
Gas burner/gas bo...
Building Type:
Residential improved
Aka 354 yale ave. remove 2nd fl gas furnace addition returen ductwork in 2nd fl replace w new 2 pipe sealed. m rispoli insp: m rispoli 203-946-8038 cert of approval contractor:860-919-9822
Valuation:
$6,850
Permit #:
M-13-63
Status:
issued
Fee:
$243
Permit Type:
Furnace/boiler
Building Type:
Two family
Similar Contractors See more
License # HIC.0574515
West Suffield, CT
115
BZ Score
$9.5K
Avg Project
-
Projects
License # HTG.0303445-S1
Newington, CT
115
BZ Score
$10.5K
Avg Project
-
Projects
License # HTG.0408576-S1
Milford, CT
116
BZ Score
$11K
Avg Project
-
Projects
William J Carlson Reviews
BuildZoom hasn't received any reviews for William J Carlson. Click here to be alerted when reviews are posted about them.
Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
William J Carlson License info
Verified License
| License # | HTG.0386598-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 William J Carlson at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
249
Permits
- Building permit records show that William J Carlson has worked on 249 permitted projects.
William J Carlson Employees
WC
William Carlson