Updated: Jun 26, 2026
Location and Projects
Address
107 WAUWINET TRL, Guilford, CT, 06437
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John M Jillson Electrician
John M Jillson, 107 Wauwinet Trl, Guilford, CT (Employees: John Jillson and Leighton Jillson) holds a Heating, Piping & Cooling Unlimited Contractor license and 3 other licenses according to the Connecticut license board.
Their BuildZoom score of 93 ranks in the top 27% of 12,093 Connecticut licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring John M Jillson, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
John M Jillson Contact Information
Address: 107 WAUWINET TRL, Guilford, CT 06437
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John M Jillson Guilford
Quality
93
73rd percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
John M Jillson has a BuildZoom score of 93, which places them above 73% of 12,093 contractors in Connecticut.
Activity
|
1 project
|
2023 |
Our building permit records indicate that John M Jillson has worked on at least
1.0 project 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
|
1 project
|
$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.
Installation of 5 ton condensing unit and air handler
Valuation:
$10,800
Permit #:
MISC-MEC-22-000353
Status:
issued
Fee:
$403
Permit Type:
Alteration
Building Type:
N/A
Replacement of atmospheric boiler with 2 high efficiency lochinvar boilers. j turcio certificate of approval
Valuation:
$27,000
Permit #:
M-19-280
Status:
issued
Fee:
$867
Permit Type:
Furnace/boiler
Building Type:
Commercial
Replacing condensing unit and air handler. m nomack
Valuation:
$6,800
Permit #:
M-19-301
Status:
issued
Fee:
$262
Permit Type:
Mechanical AC/Hea...
Building Type:
Townhouse
Replacement of condensing unit and furnace
Valuation:
$6,000
Permit #:
M-19-350
Status:
issued
Fee:
$232
Permit Type:
Furnace/boiler
Building Type:
Townhouse
Relocating hvac ducts as needed ***made incomplete.*** before we can accept this application it is not clear on what you are doing and you may be applying with the wrong application. so, if you provide this information we can make sure that you use the correct application.
Valuation:
$75
Permit #:
TB-17-964
Status:
filed
Fee:
$0
Permit Type:
Alterations - Res...
Building Type:
Single Family
Replacement of 30 ton rooftop unit with 12.5 ton and 17.5 ton units. r dillon certificate of approval
Valuation:
$74,000
Permit #:
M-19-629
Status:
issued
Fee:
$2,289
Permit Type:
Mechanical AC/hea...
Building Type:
Commercial
Installation og three boilers and two turbo max hot water heaters. m rispoli contractor: 203-996-6343
Valuation:
$160,000
Permit #:
M-16-171
Status:
complete
Fee:
$4,414
Permit Type:
Furnace/boiler
Building Type:
N/A
Convert oil burners on boiler & water heater to gas and install new gas piping. will submit detailed plan and heat loss schedule on burner. retrofit to code.
Valuation:
$20,000
Permit #:
M-14-42
Status:
complete
Fee:
$291
Permit Type:
Gas Burner/Gas Bo...
Building Type:
Multifamily 3+
Install + gas pipe trane furnace with air conditioning (rea) 5 ton diakin heat pump (front) 3 ton. r velez 203-946-7595 cert of approval contractor: 203-996-6343
Valuation:
$22,900
Permit #:
M-15-383
Status:
complete
Fee:
$679
Permit Type:
Mechanical AC/hea...
Building Type:
Commercial
Replace existing furnace and air conditioner units. r velez 203-946-7595 cert of approval contractor: 203-457-0853
Valuation:
$5,900
Permit #:
M-16-480
Status:
issued
Fee:
$231
Permit Type:
Furnace/boiler
Building Type:
N/A
Aka 64 - 70 jackson lane. inspect gas pressure test outside of building due to emergency gas leak. replaced gas line outside and tested. r velez insp: r velez 203-996-6343 cert of approval contractor: 203-996-6343
Valuation:
$400
Permit #:
P-13-99
Status:
issued
Fee:
$80
Permit Type:
Gas line
Building Type:
N/A
Replace existing furnace and air conditioning units - m rispoli inspector: m rispoli 203-946-8038 certificate of approval
Valuation:
$4,800
Permit #:
M-16-504
Status:
issued
Fee:
$201
Permit Type:
Mechanical AC/hea...
Building Type:
Multi family
Replace existing furnace and air conditioning units. m rispoli inspector: m rispoli 203-946-8038 certificate of approval
Valuation:
$4,800
Permit #:
M-16-503
Status:
issued
Fee:
$201
Permit Type:
Mechanical AC/hea...
Building Type:
Single family
Replacement of water heater. csbc 2018. m. nomack certificate of approval
Valuation:
$13,000
Permit #:
P-19-438
Status:
issued
Fee:
$443
Permit Type:
Water heater
Building Type:
Commercial
Insulation of two 7 1/2 trane. ton air handlers & linier diffusers. r velez 203-946-7595 contractor: 203-996-6343
Valuation:
$75,000
Permit #:
M-15-315
Status:
complete
Fee:
$2,067
Permit Type:
Mechanical AC/hea...
Building Type:
N/A
Replace three (3) condensinig units and one (1) air handler for 1st floor. d o'neill credit from this permit in amount of $30 to be applied to future permits. contractor: air dyanamics heating & cooling inc (203) 996-6343
Valuation:
$6,000
Permit #:
M-11-223
Status:
issued
Fee:
$186
Permit Type:
Mechanical ac/hea...
Building Type:
N/A
Installation of a high effiency boiler. r velez 203-946-7595 cert of approval contractor: 203-457-0853
Valuation:
$39,000
Permit #:
M-16-256
Status:
complete
Fee:
$1,116
Permit Type:
Furnace/boiler
Building Type:
Commercial
Extraction and replacement of existing boilers.
Valuation:
$63,000
Permit #:
M-17-630
Status:
complete
Fee:
$1,055
Permit Type:
Heating
Building Type:
Hospital/Institut...
Replace existing gas boiler (heat loss required) r velez 203-946-7595 cert of approval contractor: 203-996-6343
Valuation:
$2,800
Permit #:
M-15-560
Status:
issued
Fee:
$134
Permit Type:
Furnace/boiler
Building Type:
N/A
Replace trane furnace and hot water heater. r velez 203-946-7595 cert of apporval contractor: 203-996-6343
Valuation:
$6,298
Permit #:
M-15-559
Status:
issued
Fee:
$243
Permit Type:
Furnace/boiler
Building Type:
N/A
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Verified License
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John M Jillson License info
Verified License
| License # | HTG.0413520-S1 |
| Status | Active |
| State | Connecticut |
| Type | Heating, Piping & Cooling Unlimited Contractor |
| Date Issued | 11-25-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for John M Jillson at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | HTG.0395240-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 John M Jillson at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | ELC.0193385-E1 |
| Status | Active |
| State | Connecticut |
| Type | Electrical Unlimited Contractor |
| Date Issued | 10-01-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for John M Jillson 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 September, 2019 that this contractor does not need a license to be a electrician in Connecticut.
This is a sample of licensing data; click here to access a complete history.
93
BuildZoom Score
51
Permits
- Building permit records show that John M Jillson has worked on 51 permitted projects.
John M Jillson Employees
JJ
John Jillson
LJ
Leighton Jillson