Keystone Construction
Keystone Construction, (Owned by: Zachary Heilmann) holds a General Contractor W/Trades, Siding/Exterior Wall Finish Roofing Other license according to the Dupage County license board.
Their BuildZoom score of 91 ranks in the top 37% of 65,686 Illinois licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Keystone Construction, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
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Verified License
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Keystone Construction License info
Verified License
| License # | CR0005540 |
| Status | Active |
| County | Dupage County |
| Type | General Contractor W/Trades, Siding/Exterior Wall Finish Roofing Other |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Keystone Construction at the County of Dupage Contractor Registration Information.
This is a sample of licensing data; click here to access a complete history.
91
BuildZoom Score
Keystone Construction Employees
ZH
Zachary Heilmann
Owner