Large-scale roofing for retail, industrial, office, and multi-family buildings across NYC. Minimal disruption, maximum longevity, full compliance.
Your commercial roof is one of the most critical components of your building. A failure doesn't just mean water damage — it means business interruption, liability exposure, and costly emergency repairs.
Alter Phase brings the same hands-on approach to commercial projects that sets us apart on residential work. We physically inspect every square foot, develop a thorough plan, and execute with minimal disruption to your operations.
Fast, code-compliant repairs for active leaks, membrane failures, and damage. Documented for insurance and property management records.
Full commercial roof replacement with premium systems. We phase work to minimize business interruption and keep your building protected throughout.
New commercial construction roofing from deck to finish. We coordinate with your GC and deliver inspection-ready work on schedule.
Scheduled inspection and maintenance programs that catch problems early, extend roof life, and provide documentation for property management.
We provide detailed commercial assessments and competitive quotes across all NYC boroughs.