NYC Landmarks Preservation: Navigating LPC Approvals for Historic Building Projects

If you own or manage a landmarked building in New York City, any exterior work, and some interior work, requires approval from the NYC landmark preservation commission (LPC) before construction begins. The LPC approval process adds steps to your project timeline that standard NYC buildings don’t face. Understanding the permit types, review paths, and documentation requirements can save you months of delays and thousands of dollars in redesign costs.

Contact New York Design Architects for expert guidance on your landmarked building project. Our team has decades of experience working with the LPC on historic building renovations across NYC.

Before developing drawings, confirm the property’s designation, district boundaries, protected features, and prior LPC approvals. The LPC map is a useful first check, but it is not a substitute for title research or a review of the designation report. Your architect should also compare the proposed scope with current LPC rules and determine whether a Department of Buildings filing is required.

What Is the NYC Landmarks Preservation Commission?

The NYC Landmarks Preservation Commission is the city agency responsible for protecting buildings and places that have special historical, cultural, or architectural significance. Established in 1965, the LPC designates landmarks and regulates changes to designated properties throughout the five boroughs.

The commission consists of 11 members appointed by the mayor and is supported by preservationists, researchers, architects, historians, attorneys, and other staff. The LPC reviews proposed changes to designated properties and either approves, denies, or requests modifications to applications.

The LPC protects more than 38,000 landmark properties across New York City. These include individual landmarks, buildings within historic districts, interior landmarks, and scenic landmarks. If your property falls under any of these designations, you need LPC approval for most types of exterior work.

Types of Landmark Designations in NYC

The LPC recognizes four categories of landmark designation, and each carries different implications for what work requires approval:

Designation Type.	What It Covers.	Approval Required For.
Individual Landmarks.	Single buildings with special historical or architectural value.	Exterior work, including work not visible from the street, and work on landmark sites.
Historic Districts.	Neighborhoods with a collection of historically significant buildings.	Exterior alterations to all buildings within the district boundaries.
Interior Landmarks.	Interior spaces open to the public with architectural significance.	Changes to designated interior features (lobbies, theaters, etc.).
Scenic Landmarks.	Landscapes, parks, or natural features with historic value.	Alterations to the designated landscape or setting.

Historic districts are the most common designation in NYC. Neighborhoods like Greenwich Village, Brooklyn Heights, the Upper West Side, and Tribeca all contain extensive historic districts. If your building sits within a historic district, every exterior change, from replacing windows to installing signage, requires LPC review.

Not sure whether your building has landmark status? Check the LPC’s official Discover NYC Landmarks map.

How Does the LPC Approval Process Work?

The LPC approval process follows one of two paths depending on the scope of your proposed work: staff-level review or a public hearing before the full commission.

Staff-Level Review

Most routine projects are handled at the staff level. An LPC preservationist reviews your application, drawings, and material samples to determine whether the proposed work complies with the commission’s rules. Complete staff-level applications can often be approved within 10 business days, but timing varies by permit type and the completeness of the submission.

Work that qualifies for staff-level review includes:

• Window and door replacement in existing openings (matching historic profiles).
• Masonry restoration, repointing, and cleaning.
• Roof replacement with matching materials.
• Installation of through-window air conditioning units.
• Storefront modifications within established guidelines.
• Barrier-free access installations.

Public Hearing (Full Commission Review)

Larger or more complex projects require a public hearing before the full 11-member commission. This applies to work that falls outside the scope of the LPC’s published rules or involves significant alterations to a building’s appearance. The review includes a public hearing and can take about three months after the application is complete, depending on scheduling, complexity, and revisions.

Projects that typically require a public hearing include:

• New construction within historic districts.
• Rooftop additions visible from the street.
• Major facade alterations that change a building’s character.
• Demolition of a designated landmark (rare and heavily scrutinized).
• Projects that don’t conform to the LPC’s standard rules.

Planning a renovation in a landmarked building? Reach out to New York Design Architects before you file. Our architects can assess your project scope and prepare an LPC-ready application.

LPC Permit Types: PMW, CNE, and Certificate of Appropriateness

The LPC issues three main types of permits, each designed for a different level of work. Choosing the right permit type is one of the first decisions your architect will make when planning a landmarked building project.

Permit for Minor Work (PMW)

A Permit for Minor Work (PMW) covers exterior work that is restorative or appropriate in nature and does not require a Department of Buildings (DOB) permit. This is the fastest LPC permit type, often approved within 10 business days when the application is complete and compliant with LPC rules.

Common PMW projects:

• Replacing windows or doors in existing openings with matching profiles.
• Cleaning or resurfacing masonry and brownstone.
• Through-window HVAC installations.
• Repainting previously painted surfaces.
• Installing small exterior fixtures (lighting, mailboxes).

All LPC permit applications are filed through Portico, the commission’s online application portal. LPC can often approve a complete PMW application within 10 business days and is legally required to decide it within 20 business days after confirming that all required materials are included.

Certificate of No Effect (CNE)

A Certificate of No Effect (CNE) is issued when the proposed work requires a DOB permit but will not adversely affect significant protected architectural features of the building. The CNE confirms that the LPC has reviewed the project and determined it won’t alter the landmark character of the structure.

Typical CNE projects:

• Interior renovations that don’t affect the exterior.
• Mechanical system replacements with no visible exterior changes.
• Structural reinforcement work hidden from public view.
• Plumbing and electrical upgrades with no exterior impact.

Certificate of Appropriateness (CofA)

A Certificate of Appropriateness (CofA) is required when proposed work affects significant protected architectural features or does not conform to LPC rules. If proposed work does not conform to LPC rules or affects significant protected features, a Certificate of Appropriateness requires review by the full Commission at a public hearing. Applicants may be able to revise the proposal so it qualifies for a staff-level permit instead.

The CofA is the most involved permit type. Projects requiring a CofA include:

• Storefront redesigns with new configurations.
• New signage installations.
• Rooftop additions or bulkhead modifications.
• Facade restoration with material changes.
• New construction on vacant lots within historic districts.

What Historic Building Projects Require LPC Approval?

Property owners are often surprised by the range of projects that trigger LPC review. Here are the most common project types and their typical permit paths:

Storefront Renovations

Storefront modifications in historic districts almost always require a CofA. The LPC has specific guidelines for storefront design, including bulkhead heights, display window proportions, signage placement, and material selections. If you are planning a retail storefront redesign, confirm the LPC permit path before setting the construction schedule.

Window Replacement

Replacing windows on a landmarked building is one of the most common LPC applications. The commission typically requires replacement windows to match the historic window profiles, materials, and operation type. Wood or aluminum-clad wood windows are often required where the originals were wood. A PMW may suffice when the replacement is restorative and does not require a DOB permit. If the work requires a DOB permit and does not adversely affect significant protected features, a CNE may apply. Work that affects significant protected features or does not conform to LPC rules may require a CofA.

Rooftop Work and Additions

Any rooftop addition, mechanical equipment installation, or bulkhead modification that is visible from a public street requires LPC review. Rooftop additions in historic districts almost always go to a public hearing. The LPC evaluates visibility, setback from the street wall, height, and materials.

Signage

Installing new signs or modifying existing signs on landmarked buildings requires LPC approval. The commission regulates sign size, placement, illumination type, and materials. Projecting signs, awning signs, and large wall signs typically require a CofA.

Facade Repairs and Restoration

While routine maintenance (cleaning, repointing with matching mortar) can often be handled through a PMW, more involved facade work may require a CofA. This includes replacing deteriorated ornamental elements, modifying window or door openings, or applying new coatings or finishes. Buildings subject to NYC building permit requirements and Local Law 11 facade inspections may need to coordinate both DOB and LPC approvals simultaneously. See the NYC Department of Buildings for current filing requirements.

Need help coordinating LPC and DOB approvals for your building project? Contact New York Design Architects to discuss your project requirements.

How to Work with an Architect on Landmarked Building Projects

Hiring an architect with LPC experience is one of the most effective ways to move a landmarked building project forward without costly delays. Here is what to expect from the process:

1. Initial Assessment: Your architect reviews the landmark designation, identifies which features are protected, and determines the appropriate permit type for the proposed work.
2. Design Development: The architect prepares drawings and specifications that comply with LPC rules while meeting your project goals. This includes selecting materials, finishes, and details that align with the building’s historic character.
3. Application Preparation: Your architect assembles the LPC application package, including scaled drawings, photographs of existing conditions, material samples, and a written description of the proposed work.
4. LPC Submission and Review: The application is filed through Portico. Your architect may attend a pre-application meeting with LPC staff to discuss the project before formal submission.
5. Revisions and Approval: If the LPC requests modifications, your architect revises the design and resubmits. Once approved, the LPC issues the appropriate permit.
6. DOB Filing: After receiving the LPC permit, your architect files the project with the NYC Department of Buildings for construction permits. The LPC approval is a prerequisite for DOB filing on landmarked properties.
7. Construction Oversight: During construction, your architect verifies that the work matches the approved LPC drawings. The LPC may also conduct site inspections.

Working with an architect who understands both the NYC Building Code and the LPC’s preservation standards is essential for landmarked building projects. The two regulatory systems overlap, and mistakes in either one can stop a project in its tracks.

Frequently Asked Questions About LPC Approvals

How long does the LPC approval process take?

Complete PMW applications can often be approved within 10 business days, while CNE applications can often be approved within 10 business days; statutory decision deadlines differ by permit type. Projects that require a public hearing before the full commission can take about three months or longer, depending on complexity, completeness, revisions, and the hearing schedule.

Do I need LPC approval for interior work on a landmarked building?

LPC review is required for interior work that needs a Department of Buildings permit, affects the exterior, or affects an interior landmark. A CNE may apply when the work requires a DOB permit but does not adversely affect significant protected features. Confirm the appropriate permit path with LPC or your architect before filing.

What happens if I do work without LPC approval?

Performing work on a landmarked building without the required LPC permit is a violation. The LPC can issue a warning letter or refer the matter for city enforcement, which can impose fines. In some cases, property owners have been required to reverse unauthorized work and restore the building to its prior condition at their own expense.

Can the LPC deny my application?

Yes. The LPC can deny applications that do not meet its preservation standards. If your application is denied after a public hearing, you can request a modification to your proposal and resubmit, or appeal the decision through the courts. Working with an experienced architect before filing significantly reduces the risk of denial.

How much does an LPC permit cost?

The LPC charges filing fees based on the permit type. PMW applications have a lower fee than CofA applications. Fee schedules are published on the LPC website and are subject to change. In addition to filing fees, you should budget for professional fees (architect, expediter) to prepare the application package.

How do I submit an LPC application?

Applications are submitted through Portico, LPC’s online permit portal. The portal’s application assistant helps identify the likely permit path and required materials, but the assigned staff preservationist makes the final determination after reviewing the complete submission. Include clear existing-condition photographs, drawings, and material information so the review can begin without avoidable requests for more information.

Do I need both an LPC permit and a DOB permit?

In most cases, yes. The LPC permit addresses the preservation and design aspects of the work, while the DOB permit addresses building code compliance, structural safety, and zoning. The LPC approval must be obtained first, and it becomes part of your DOB application package. For guidance on the DOB filing process, see our NYC Department of Buildings.