Updated: Jun 16, 2026
Location and Projects
Address
23 APPLETREE LN, Norwalk, CT, 06850
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Karol Kostrzewski Construction
Serving Norwalk, Connecticut and neighboring areas, Karol Kostrzewski specializes in residential construction and remodeling projects. With 16 years of experience in the industry, Karol works with homeowners to update and improve existing properties, focusing on spaces such as kitchens, bathrooms, and living areas. Project experience includes interior renovations, custom carpentry, finish work, and general home improvements. Karol partners directly with clients throughout the construction process, from planning and material selection through execution. Clients in Norwalk and surrounding Fairfield County communities turn to Karol for skilled management of residential updates, structural repairs, and remodels tailored to individual needs and property styles.
Karol Kostrzewski Services
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Karol Kostrzewski Contact Information
Address: 23 APPLETREE LN, Norwalk, CT 06850
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Karol Kostrzewski Norwalk
Quality
97
82nd percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Karol Kostrzewski has a BuildZoom score of 97, which places them above 82% of 12,093 contractors in Connecticut.
Activity
|
1 project
|
2025 |
|
1 project
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Karol Kostrzewski has worked on at least
3.0 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
|
1 project
|
$50k-$100k |
|
1 project
|
$250k-$500k |
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.
Remove right portion of existing single family house and construct 2 story addition with garage addition (need pe stamp)
Valuation:
$390,000
Permit #:
BLD-2023-02463
Status:
issued
Fee:
$4,001
Permit Type:
N/A
Building Type:
N/A
Interior renovation for kitchen bathroom miscellaneous interior renovations
Valuation:
$95,000
Permit #:
BLD-2025-01979
Status:
issued
Fee:
$975
Permit Type:
N/A
Building Type:
N/A
Two-story addition for pool room with bedroom suite above with unfinished attic
Valuation:
$375,000
Permit #:
BLD-2021-01813
Status:
issued
Fee:
$3,848
Permit Type:
N/A
Building Type:
N/A
Kitchen remodeling and closing in side porch make it into living space using existing foundation
Valuation:
$95,000
Permit #:
B-22-162
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Interior renovation for structural renovation to install beam misc. interior renovations
Valuation:
$35,000
Permit #:
BLD-2022-02793
Status:
issued
Fee:
$359
Permit Type:
N/A
Building Type:
N/A
Interior renovation for new kitchen in same location (no structural work at this time)
Valuation:
$55,000
Permit #:
BLD-2018-83716
Status:
final
Fee:
$564
Permit Type:
N/A
Building Type:
N/A
Remove wires from demolished walls addition 4 recessed lights
Valuation:
N/A
Permit #:
BLD-2022-02794
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Rough plumbing waste water and vent lines to new fixtures. gas pipe fire place stove and water heater
Valuation:
N/A
Permit #:
BLD-2023-02466
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of two carrier fan coils 2.5 tons two bryant sentry condenser units and all new ductwork installation of whole house bathroom fans dryer vents and kitchen hood
Valuation:
N/A
Permit #:
BLD-2023-02465
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition - bedrooms bathrooms laundry kitchen garage
Valuation:
N/A
Permit #:
BLD-2023-02464
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Re-model kitchen and install pre-fab fireplace
Valuation:
$40,000
Permit #:
BLD-2012-74717
Status:
final
Fee:
$410
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$175,000
Permit #:
10-193/000 000 BOO1 00
Status:
C.O. ISSUED
Fee:
$2,725
Permit Type:
Building permit
Building Type:
N/A
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Karol Kostrzewski License info
Verified License
| License # | NHC.0016578 |
| Status | Active |
| State | Connecticut |
| Type | New Home Contractor |
| Date Issued | 04-01-2026 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Karol Kostrzewski at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | HIC.0622730 |
| Status | Inactive |
| State | Connecticut |
| Type | Home Improvement Contractor |
- According to the Connecticut Department of Consumer Protection, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Karol Kostrzewski at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
97
BuildZoom Score
8
Permits
- Building permit records show that Karol Kostrzewski has worked on 8 permitted projects.
Karol Kostrzewski Employees
KK
Karol Kostrzewski