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Double Check Builders, in Photos
Double Check Builders, in Construction
Live in the home you’ve always envisioned with services from Double Check Builders in Ronkonkoma, New York. In business since 1958, Double Check Builders, Inc. has professional experience in the construction of first- and second-floor home additions on a slab, crawlspace, or full basement. We specialize in Long Island home improvement and new home construction.
Double Check Builders, Inc. is a family-owned and -operated home improvement business, originally founded by Morton Ilberman in 1958. Morton took Joe Walker on as an apprentice in the early 1980s. After Morton lost his battle with cancer in 1989, Joe took over as the owner and operator of Double Check Builders. In 2007 his son Matthew became part of the team and now he, together with Joe, handles all the daily operations.
Our family-owned-and-operated company employs several crews of highly skilled and professionally experienced contractors in order to ensure all your home improvements, additions, interior alterations, roofing, siding, and windows are installed in accordance with New York state, Long Island, and town building codes. Plus, we provide services for blueprints, permits, and paperwork expedition.
Double Check Builders, Inc. is a family-owned and -operated home improvement business of highly skilled workers ensuring all your homes roofing, siding, and windows, and improvement needs are met.
From BuildZoom: Double Check Builders, in, 270 Ronkonkoma Ave, Ronkonkoma, NY (Owned by: Joseph Walker) holds a Home Improvement Contractors license and 7 other licenses according to the Nassau County license board.
Their BuildZoom score of 87 does not rank in the top 50% of New York contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Double Check Builders, in, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Double Check Builders, in Services
Double Check Builders, in Contact Information
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Building Permits by Double Check Builders, in
This is a sample of this contractor's permits. Click here to access their complete permit history.
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Double Check Builders, in License info
Verified License
| License # | 190521 |
| Status | Active |
| County | Nassau County |
| Type | Home Improvement Contractors |
- BuildZoom verified this license was active as of November 2025.
Verify this license's status for Double Check Builders, in at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 190521 |
| Status | Inactive |
| County | Nassau County |
| Type | Home Improvement Contractors |
- According to the Nassau County Office 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 Double Check Builders, in at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | NAT-45789-3 |
| 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 Double Check Builders, in at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 002447-0 |
| Status | Inactive |
| Town | Town Of Southampton |
- According to the Town of Southampton Department of Land Management, 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 Double Check Builders, in at the Town of Southampton Department of Land Management.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | H1714780000 |
| Status | Inactive |
| County | Nassau County |
| Type | Home Improvement Contractors |
- According to the Nassau County Office 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 Double Check Builders, in at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | H17147800 |
| Status | Inactive |
| County | Nassau County |
| Type | Home Improvement Contractors |
- According to the Nassau County Office 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 Double Check Builders, in at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | NAT-45789-2 |
| 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 Double Check Builders, in at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
Unverified License
| License # | 16843 |
| Status | Unable To Verify |
| County | Suffolk County |
| Type | H H1 - Gc |
- BuildZoom was not able to verify this license with the licensing board
This is a sample of licensing data; click here to access a complete history.