Updated: Jul 01, 2026
Location and Projects
Address
870 MANOR LANE, Bay Shore, NY, 11706
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Cornerstone Structures Ll Construction
Based in Bay Shore, NY, Cornerstone Structures LL brings a decade of construction experience to residential and commercial projects throughout Suffolk County and the surrounding communities. The company specializes in general contracting services, with a portfolio that includes new home construction, home additions, interior renovations, and commercial build-outs. Cornerstone Structures LL works with homeowners seeking to expand or remodel their living spaces as well as local businesses aiming to upgrade or customize their facilities. With ten years of operation, the firm has managed projects ranging from full-scale property development to targeted improvement work, delivering results that align with client specifications and local building requirements. Their service area covers Bay Shore and neighboring towns across Long Island.
Cornerstone Structures Ll Services
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Cornerstone Structures Ll Contact Information
Phone Number: (646) 358-7312
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Address: 870 MANOR LANE, Bay Shore, NY 11706
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Cornerstone Structures Ll Bay Shore
Quality
104
91st percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornerstone Structures Ll has a BuildZoom score of 104, which places them above 91% of 77,888 contractors in New York.
Activity
|
2 projects
|
2025 |
|
1 project
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that Cornerstone Structures Ll has worked on at least
5.0 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
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
4 projects
|
$100k-$250k |
|
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.
Building Permits by Cornerstone Structures Ll
This is a sample of this contractor's permits. Click here to access their complete permit history.
Proposed minor interior renovation work at cellar's accessory recreation spaces (building b) and first floor's lobby fronting wythe avenue (building a). no change to existing use occupancy egress or floor area
Valuation:
$100,956
Permit #:
B01212852-I1-GC
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Removal of steel grate flooring and plywood covering on mezzanine level. proposed installation of non-rated gyp. bd. partitions at mezz level. proposed work does not constitute any change in use floor area occupancy or egress
Valuation:
$111,625
Permit #:
B00931567-I1-GC
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Alteration type 1 - conversion of exist'g 1-family to a 4-family dwelling. work to include interior renovation and partial demolish that will affect the building envelope horizontal and vertical enlargement removal and installation of non-load bearing partitions doors windows and carpentry work
Valuation:
$525,000
Permit #:
321654722-01-AL
Status:
issued
Fee:
$5,817
Permit Type:
N/A
Building Type:
N/A
Alteration type 1 - earthwork conversion of exist'g 1-family to a 4-family dwelling. work to include interior renovation and partial demolish that will affect the building envelope horizontal and vertical enlargement removal and installation of non-load bearing partitions doors windows and carpentry work
Valuation:
$525,000
Permit #:
321654722-01-FO-EA
Status:
issued
Fee:
$5,817
Permit Type:
N/A
Building Type:
N/A
Alteration type 1 - foundation/earthwork conversion of exist'g 1-family to a 4-family dwelling. work to include interior renovation and partial demolish that will affect the building envelope horizontal and vertical enlargement removal and installation of non-load bearing partitions doors windows and carpentry work
Valuation:
$525,000
Permit #:
321654722-01-FO
Status:
issued
Fee:
$5,817
Permit Type:
N/A
Building Type:
N/A
Alteration type 1 - construction equipment - fence conversion of exist'g 1-family to a 4-family dwelling. work to include interior renovation and partial demolish that will affect the building envelope horizontal and vertical enlargement removal and installation of non-load bearing partitions doors windows and carpentry work
Valuation:
$525,000
Permit #:
321654722-01-EQ-FN
Status:
issued
Fee:
$5,817
Permit Type:
N/A
Building Type:
N/A
Alteration residence no change of occupancy use egress or zoning in thisapplication
Valuation:
$436,954
Permit #:
B08011405-I1-GC
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
These drawings are for the structural renovation of an existing wood floor & roof framedrow house with unreinforced masonry walls
Valuation:
$170,000
Permit #:
B00881154-I1-ST
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Conversion of first floor and mez1 retail space d (east tower) to health and fitness establishment
Valuation:
$105,500
Permit #:
M00887024-I1-GC
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Provide new mechanical system for single family house.no change in use egress or occupancy
Valuation:
$31,050
Permit #:
B08011687-I1-MS
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Mechanical work filed in conjunction with commercial tenant renovation on ground and mez
Valuation:
$20,000
Permit #:
M08044874-I1-MS
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of temporary construction fence per plan submitted. work shall comply with 2014 building codes chapter 33. no change in use egress and/or occupancy with this application
Valuation:
$1
Permit #:
M00611195-I1-FN
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New structural infill in existing opening on mez1 for retail d (east wing)
Valuation:
$6,500
Permit #:
M00887024-S2-ST
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Renovation of a two family home as per plans filed herewith. no change to occupancy use or egress under this application
Valuation:
$90,000
Permit #:
B00538423-I1-GC
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Interior demolish of 2 family building. no change to occupancy use or egress under this application
Valuation:
$8,000
Permit #:
B00504523-I1-GC
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
121189007-01-NB
Status:
issued
Fee:
$17,377
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
321654722-03-AL
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
321654722-03-FO-EA
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
321654722-03-FO
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
321654722-02-EQ-FN
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Verified License
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Cornerstone Structures Ll License info
Verified License
| License # | NAT-F175947-2 |
| Status | Active |
| Nation | Environmental Protection Agency |
| Type | Renovation |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Cornerstone Structures Ll at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 025864 |
| Status | Active |
| State | New York |
| Type | Superintendent Of Construction |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Cornerstone Structures Ll at the New York City Department of Buildings.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 616128 |
| Status | Active |
| State | New York |
| Type | Gc Safety Registration |
- When BuildZoom last verified this license, it had an expiration date of July, 2025. Check the current license status of Cornerstone Structures Ll with the New York City Department of Buildings
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | PC8266 |
| Status | Inactive |
| County | Putnam County |
| Type | General Carpentry |
- According to the Putnam County Department of Consumer Affairs, 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 Cornerstone Structures Ll at the Putnam County Department of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| County | Westchester County |
| Type | Home Improvement Contractor |
- According to the Consumer Westchester County, NY, 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.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | NAT-F175947-1 |
| Status | Inactive |
| Nation | Environmental Protection Agency |
| Type | Renovation |
- According to the United States Environmental Protection Agency, 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 Cornerstone Structures Ll at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 2053490-DCA |
| Status | Inactive |
| State | New York |
| Type | Home Improvement Contractor |
- According to the New York Department of Consumer Affairs, 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 Cornerstone Structures Ll at the New York Department of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
104
BuildZoom Score
Insured
| Insurer | Lloyds |
Insured
| Workers Comp Provider | Nysif |
32
Permits
- Building permit records show that Cornerstone Structures Ll has worked on 32 permitted projects.
Cornerstone Structures Ll Employees
GJ
Guerriero James J.
JG
James J Guerriero
Owner