Updated: Jul 13, 2026
Location and Projects
Address
2 WILTON AVE, Norwalk, CT, 06850
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Lj Denner and Sons Construction
Lj Denner and Sons Inc serves the Norwalk, Connecticut area with over three decades of experience in residential construction and remodeling. The company undertakes a range of projects for homeowners, focusing on custom home building, home additions, and large-scale renovations. Based in Norwalk, their services also extend to nearby Fairfield County communities. Project examples include kitchen and bathroom remodels, single-family home additions, and comprehensive interior upgrades. Lj Denner and Sons Inc. works closely with clients throughout the construction process, from initial planning stages through project completion. The team employs established construction techniques and works with local suppliers to deliver projects that align with the region’s architectural styles. With 31 years in the industry, Lj Denner and Sons Inc brings extensive knowledge of Fairfield County’s residential building requirements.
Lj Denner and Sons Inc Services
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Lj Denner and Sons Inc Contact Information
Address: 2 WILTON AVE, Norwalk, CT 06850
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Lj Denner and Sons Inc Norwalk
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Lj Denner and Sons Inc has a BuildZoom score of 101, which places them above 88% of 12,093 contractors in Connecticut.
Activity
|
3 projects
|
2025 |
|
7 projects
|
2024 |
|
4 projects
|
2023 |
Our building permit records indicate that Lj Denner and Sons Inc has worked on at least
14.0 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 |
|
3 projects
|
New Constructions |
|
5 projects
|
Multi-room remodels |
|
4 projects
|
Kitchen remodels |
Analyzing permits over the last 4 years shows that Lj Denner and Sons Inc mostly works on
multi-room remodel
and kitchen remodel
projects.
Pricing
|
1 project
|
$5k-$20k |
|
4 projects
|
$100k-$250k |
|
3 projects
|
$250k-$500k |
|
4 projects
|
$500k-$1mil |
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 Lj Denner and Sons Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Interior renovations replace kitchen bathrooms change windows and doors. re-do closets re-do floors. not moving any bearing walls
Valuation:
$145,000
Permit #:
BLD-2025-00140
Status:
complete
Fee:
$1,488
Permit Type:
N/A
Building Type:
N/A
New single family house 2-1/2 stories finished attic and basement 4 bedrooms
Valuation:
$622,000
Permit #:
BLD-2024-02241
Status:
complete
Fee:
$6,382
Permit Type:
N/A
Building Type:
N/A
Two-story addition on crawl space with 1st floor family room & second floor master bedroom suite remodel kitchen & misc. interior renovations
Valuation:
$380,000
Permit #:
BLD-2023-01499
Status:
complete
Fee:
$3,899
Permit Type:
N/A
Building Type:
N/A
Install two 60 000 btu propane furnaces with two and three ton air conditioning systems all dutwork refrigeration and condensate piping
Valuation:
N/A
Permit #:
BLD-2025-00047
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Building new 2-1/2 story house finished attic and basement 4 bedrooms
Valuation:
$706,000
Permit #:
BLD-2024-01486
Status:
complete
Fee:
$7,244
Permit Type:
N/A
Building Type:
N/A
Install new 100 000 btu gas furnace with 4 ton air conditioning system. rework ductwork and kitchen bathroom vents
Valuation:
N/A
Permit #:
BLD-2025-00417
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Two-story addition for bedroom with study above (on piers)
Valuation:
$267,000
Permit #:
BLD-2024-01961
Status:
complete
Fee:
$2,739
Permit Type:
N/A
Building Type:
N/A
2 story s/f dwelling with finished basement and finished attic. (need mod - code change)
Valuation:
$550,000
Permit #:
BLD-2022-03652
Status:
complete
Fee:
$5,643
Permit Type:
N/A
Building Type:
N/A
Relocate first floor heating outlets to new locations. relocate second floor supply and return outlets for new addition. reconnect existing air conditioning condenser units
Valuation:
N/A
Permit #:
BLD-2023-01501
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install 3-ton split gas system for basement & 1st floor and 4-ton split gas system for 2nd & 3rd floors 60 000 btu 1st floor and 80 000 btu furnace 2nd floor with 3-ton cooling 1st floor and 4-ton cooling 2nd floor
Valuation:
N/A
Permit #:
BLD-2021-00176
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install two 60 000 btu gas furnaces paired with 2 and 3 ton air conditioning systems all ductwok refrigeration nd condensate piping
Valuation:
N/A
Permit #:
BLD-2024-01489
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Interior kitchen remodel. install header in block wall for new opening
Valuation:
$110,000
Permit #:
BLD-2024-01009
Status:
issued
Fee:
$1,129
Permit Type:
N/A
Building Type:
N/A
Construct 16 x 32 6 - pool house with portico
Valuation:
$400,000
Permit #:
BLD-2022-02168
Status:
complete
Fee:
$4,104
Permit Type:
N/A
Building Type:
N/A
Install 60 000 unit btu gas fired furnace with 3 ton condensing unit. all ducts galvanized and insulated where not in thermal envelope
Valuation:
N/A
Permit #:
BLD-2022-03370
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install a runtru three ton 60, 000 btu gas furnace with a three ton condensing unit for first floor. install a four ton 80, 000 btu gas furnace with a three and a half ton condensing unit for the second floor area
Valuation:
$25,900
Permit #:
M-21-667
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
Single family
Install 4-ton heating and cooling systems 2 condensing units and 2 gas furnaces. all ducts galvanized with flexible duct connections
Valuation:
N/A
Permit #:
BLD-2022-01502
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install two runtru 60 0000 btu gas furnaces with 2 runtru 3-ton condensing units. removal of existing equipment
Valuation:
$35,000
Permit #:
BLD-2022-01685
Status:
issued
Fee:
$359
Permit Type:
N/A
Building Type:
N/A
Install (1) 2 1/2 ton gas heat and cool system for 1st fl and lower leve. install (1) 3 1/2 ton gas heat and cool system for 2nd and 3rd floor
Valuation:
N/A
Permit #:
BLD-2022-03659
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Interior renovation for kitchen mudroom powder room. no structural work
Valuation:
$125,000
Permit #:
BLD-2024-01818
Status:
issued
Fee:
$1,283
Permit Type:
N/A
Building Type:
N/A
Install 60 000 btu runtru gas furnace with 4 ton runtru condenser and evaporator coil
Valuation:
N/A
Permit #:
BLD-2024-02381
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Lj Denner and Sons Inc License info
Verified License
| License # | HTG.0306169-D1 |
| Status | Active |
| State | Connecticut |
| Type | Heating, Piping & Cooling Limited Contractor |
| Date Issued | 09-01-2025 |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Lj Denner and Sons Inc at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
101
BuildZoom Score
345
Permits
- Building permit records show that Lj Denner and Sons Inc has worked on 345 permitted projects.
Lj Denner and Sons Inc Employees
LD
Leonard Denner