NYC Landmarks Preservation Commission: Certificate of No Effect, Permit to Alter, and LPC Filing
9 min read · Updated 2025-01-15
Guide to NYC Landmarks Preservation Commission (LPC) approvals: when CNE or Permit to Alter is required, the LPC filing process, approval timelines, and working in historic districts.
LPC Approval Process
What does the NYC Landmarks Preservation Commission regulate?
The NYC Landmarks Preservation Commission (LPC) regulates changes to: (1) Individual Landmarks — buildings, structures, objects, or sites designated for their architectural, aesthetic, or historical significance; (2) Interior Landmarks — interior spaces open to the public; (3) Scenic Landmarks — landscape features; and (4) Historic Districts — geographically defined neighborhoods with historic character. Any change to the exterior of a landmark or a building within a historic district requires LPC approval before DOB will issue a permit.
What is a Certificate of No Effect (CNE) from LPC?
A Certificate of No Effect (CNE) is issued by LPC for proposed work that will have no effect on the protected architectural features of a landmark or historic district building. CNEs are issued for routine maintenance, interior alterations that don't affect the exterior, or simple repairs using identical materials and methods to the existing conditions. CNEs can often be issued quickly (sometimes within a week) through LPC's online portal. They serve as the "prior approval" needed before DOB can issue a permit for covered properties.
What is a Permit to Alter (PTA) from LPC?
A Permit to Alter (sometimes called an "approval" or "LPC permit") is required when proposed work will affect the protected features of a landmark or historic district property. This includes: replacement of historic windows, storefront modifications, facade repairs using different materials, additions, construction on landmarked sites, and installation of signage or mechanical equipment visible from the street. PTAs require a more detailed review than CNEs and may require approval by the full Commission at a public hearing.
What is the LPC Staff Level Review?
For straightforward work that qualifies for approval without a full Commission hearing, LPC staff can issue approvals at the staff level — these are CNEs or minor PTAs. Staff-level approvals are faster (typically 4-8 weeks) and don't require a public hearing. Work that doesn't clearly meet LPC's standards must go to a full Commission hearing, which involves public notice, testimony from interested parties, and a Commission vote. Understanding which path your project will take is key to scheduling.
What is a Binding Report from LPC?
A Binding Report is issued by LPC when the proposed work is determined not to require any LPC approval — for example, because it's entirely internal or uses existing materials. The Binding Report documents this determination and is submitted to DOB as evidence that LPC review is not required. Binding Reports are free and can often be obtained quickly through the online LPC portal.
How long does LPC approval typically take?
Timeline varies by approval type: Binding Reports and simple CNEs can be issued within 5-15 business days. Staff-level PTAs take 4-8 weeks on average. Full Commission approvals require: public notice period (typically 10+ days), scheduling at the Commission's calendar, the hearing itself, and post-hearing issuance. The full Commission calendar is typically scheduled monthly — missing a cycle adds a month. Total timeline for a Commission hearing approval can be 3-6 months.
What types of materials are typically approved for facade repairs in historic districts?
LPC guidelines strongly favor materials that match the historic materials in kind — pointing mortar that matches the original (softer lime-based mortar for older brick buildings, not modern portland cement), window replacements that match the profile and operation of the original, brownstone repairs using brownstone or high-quality synthetic materials that match the original color and texture. LPC has published detailed technical guidelines for specific repair types. Using incompatible materials (e.g., modern portland cement pointing on 19th-century brick) can accelerate deterioration and will be rejected.
Can I do emergency repairs on a landmark without LPC approval?
Emergency repairs necessary to prevent imminent danger or further deterioration can be done without prior LPC approval, but only to the extent necessary to stabilize or prevent damage — not as an opportunity to complete work that would otherwise require review. After the emergency is addressed, the owner must notify LPC and obtain appropriate approvals for any remaining work or to confirm the emergency work is acceptable. Document the emergency conditions with photographs before and during the emergency repair.
What happens if I do unpermitted work on a NYC landmark?
Unpermitted work on a landmark triggers an LPC violation. LPC can issue a Notice of Violation and require the owner to restore the property to its condition before the unpermitted work was done — even if the work was of high quality. This can be enormously expensive — removing new windows and replacing them with historically appropriate windows, for example. Civil penalties can also be imposed. LPC cooperates with DOB to ensure that permits aren't issued for work that needs prior LPC approval.