LPC Permit Services
Landmark & Historic Window Replacement in NYC
We replicate original window and door designs in wood, steel or aluminum and streamline Landmarks Preservation Commission approvals to keep your project on schedule.
Protecting NYC’s Historic Architecture
We Handle the Approvals, You Keep Your Schedule
Our team carefully matches original brick molding profiles and the architectural details that define each property’s historic character. With decades of LPC experience, we prepare “existing vs. proposed” condition drawings and manage Certificate of No Effect (CNE) applications.
From classic wood restorations to custom steel-frame replacements, every installation is completed with precision and respect for New York’s architectural heritage, while meeting today’s performance and energy standards.
- Existing vs. proposed condition drawings
- Certificate of No Effect (CNE) applications
- Wood, steel and aluminum replication
About the LPC
See Why the LPC Exists
The NYC Landmarks Preservation Commission is the largest municipal preservation agency in the United States, protecting more than 38,000 landmark properties, most within 157 historic districts across all five boroughs.
Good to Know
LPC FAQs
Common questions about landmark window projects.
What Is the NYC Landmarks Preservation Commission?
The LPC is the largest municipal preservation agency in the U.S. Its mission is to protect architecturally, historically and culturally significant buildings and sites by designating them as landmarks or including them in historic districts, where changes are regulated.
When Was the Landmarks Law Created?
The Commission was created in 1965 after the passage of the NYC Landmarks Law, signed by Mayor Robert F. Wagner, largely in response to the demolition of the original Pennsylvania Station.
Do I Need LPC Approval to Replace Windows?
If your building is a designated landmark or in a historic district, window and door changes generally require LPC review. We prepare the drawings and applications for you.
What Is a Certificate of No Effect?
A CNE is an LPC permit for work that does not affect the protected architectural features of a building. We manage CNE applications as part of our permit services.