Location and Projects
John C Hammann Contractors Construction
John C Hammann Contractors LLC, 1 Haley St, Williamstown, MA (Owned by: John Hamman) holds a Home Improvement Contractor license according to the Massachusetts license board.
Their BuildZoom score of 94 ranks in the top 24% of 139,240 Massachusetts licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring John C Hammann Contractors LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
John C Hammann Contractors LLC Services
John C Hammann Contractors LLC Contact Information
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John C Hammann Contractors LLC Reviews
5 out of 5 stars, based on
2
reviews
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AnonymousDecember 1, 2017Verified Hire
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By SkeezertOctober 20, 2011
John Hammann has done work for me and it is the best job I have ever done on my home. I would never hire anyone else.
Building Permits by John C Hammann Contractors LLC
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John C Hammann Contractors LLC License info
Verified License
| License # | 157605 |
| Status | Active |
| State | Massachusetts |
| Type | Home Improvement Contractor |
| Date Issued | 10-22-2025 |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for John C Hammann Contractors LLC at the Mass.gov Consumer Affairs and Business Regulation.
This is a sample of licensing data; click here to access a complete history.
John c hammann contractor llc is a top quality craftsman. Specializes in high end homes. Works time and material. Doesn't drive the subs very hard. Our place is beautiful and we continue to use him for things that come up.