Updated: Jul 17, 2026
Location and Projects
Address
122 OXBOW LN, Guilford, CT, 06437
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William Dematteo Plumber
William Dematteo, 122 Oxbow Ln, Guilford, CT holds a Heating, Piping & Cooling Unlimited Contractor license and 1 other license according to the Connecticut license board.
Their BuildZoom score of 90 indicates that they are licensed or registered but we do not have additional information about them.
Their license was verified as active when we last checked. If you are thinking of hiring William Dematteo, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
William Dematteo Services
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William Dematteo Contact Information
Address: 122 OXBOW LN, Guilford, CT 06437
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Installation of one rheem 96% furnace, a/c coil,new supply & return plenum, main duct,5 supplies to existing layout, thermostat & all gas piping 1 future tee for water heater
Valuation:
$8,000
Permit #:
TM-17-409
Status:
filed
Fee:
$99
Permit Type:
Mechanical - R
Building Type:
Single Family
Gas piping for stove and future boiler. all iron pipe
Valuation:
$200
Permit #:
11590
Status:
issued
Fee:
N/A
Permit Type:
Other (specify in...
Building Type:
Single family
One inch gas piping to vombi boiler one inch piping with future tee natural gas
Valuation:
$1,000
Permit #:
14603
Status:
issued
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
Replace oil fired furnace with 94% veissmann gas boiler with all necessary gas piping(black iron pipe)
Valuation:
$7,000
Permit #:
M-15-412
Status:
issued
Fee:
$87
Permit Type:
Mechanical - R
Building Type:
Single Family
Replace oil furnace with 95% rheem 60, 000 btu natural gas furnace. gas piping ductwork &4 inch chimney liner for existing gas fired water heater
Valuation:
$9,000
Permit #:
M-14-160
Status:
issued
Fee:
$298
Permit Type:
Furnace/boiler
Building Type:
Single family
Replace oil fired furnace with natural gas furnace no a/c(mechanical permit)
Valuation:
$3,000
Permit #:
9428
Status:
issued
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
Gas piping
Valuation:
$500
Permit #:
16641
Status:
complete
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
Gas piping for propane stove and future boiler. all iron pipe. relocate kitchen sink
Valuation:
$2,400
Permit #:
10969
Status:
issued
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
Remove gas unit install 90+ ream unit. heat only all necessary piping 5/16 pump and one new t.t
Valuation:
$5,200
Permit #:
M-13-535
Status:
issued
Fee:
$216
Permit Type:
Furnace/boiler
Building Type:
Single family
Install new hvac system. m rispoli 203-946-8038 cert of approval contractor: 203-464-4206
Valuation:
$5,000
Permit #:
M-13-420
Status:
issued
Fee:
$189
Permit Type:
Mechanical ac/hea...
Building Type:
Single family
Replace gas fired furnace with air conditioning. pressure test and inspect gas pipe and appliance for safe operation as per code
Valuation:
$3,000
Permit #:
M-11-03119
Status:
issued
Fee:
N/A
Permit Type:
Mechanical pmt un...
Building Type:
N/A
1 50 gallon water heater. m rispoli cert of approval contractor: 203-414-4206
Valuation:
$2,000
Permit #:
P-13-435
Status:
issued
Fee:
$107
Permit Type:
Water heater
Building Type:
Single family
Gas piping for furnace & water heater
Valuation:
$2,000
Permit #:
9427
Status:
issued
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
Install rheem gas furnace gas piping to 1/2 tee, flu pipe
Valuation:
$5,880
Permit #:
M-13-534
Status:
issued
Fee:
$216
Permit Type:
Furnace/boiler
Building Type:
Single family
95% rheem furnace and navien unit (heating mechanica lpermit)
Valuation:
$9,000
Permit #:
5345
Status:
complete
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
Gas piping for furnace navien on demand unit and dryer
Valuation:
$1,000
Permit #:
5344
Status:
complete
Fee:
N/A
Permit Type:
New installation
Building Type:
Single family
New istallation
Valuation:
$500
Permit #:
2992
Status:
active
Fee:
N/A
Permit Type:
Replacement
Building Type:
Single family
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Verified License
BuildZoom confirmed this contractor's license
William Dematteo License info
Verified License
| License # | HTG.0387094-S1 |
| Status | Active |
| State | Connecticut |
| Type | Heating, Piping & Cooling Unlimited Contractor |
| Date Issued | 09-01-2025 |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for William Dematteo at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | PLM.0279535-P1 |
| Status | Active |
| State | Connecticut |
| Type | Plumbing & Piping Unlimited Contractor |
| Date Issued | 11-01-2025 |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for William Dematteo at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
90
BuildZoom Score
13
Permits
- Building permit records show that William Dematteo has worked on 13 permitted projects.
William Dematteo Employees
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William Dematteo