New York City • DOB, Landmarks & window guards
Window Replacement in New York City
New York has layers other cities don't: DOB permit exemptions with conditions, Landmarks Preservation Commission rules, a window guard law and mandatory contractor licensing. This guide explains each, with sources and honest notes about what to confirm.
Last updated . Facts last checked against sources in October 2026.
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NYC-specific rules
Four things that change a window project in the five boroughs.
Permit exemptions have conditions
Under DOB rules, replacing existing windows generally doesn't need a work permit if the windows aren't on a lot line, the masonry opening and operable area don't change, and required light and ventilation aren't affected. Fire-rated windows, lot-line windows and size changes do need permits. Verify with DOB or a licensed professional.
Landmarks Preservation Commission
Window or door changes on individual landmarks and in historic districts need LPC approval. The Commission compares material, operation, configuration, details and finish, with the strictest matching on street-facing facades.
Window guard law
Health Code §131.15 requires owners of multiple dwellings (three or more units) to provide approved window guards where a child 10 or younger lives, and on hallway windows. Condo owners and co-op boards are covered.
Co-ops and condos add rules
Your building's alteration agreement may add requirements on window style, color and installer insurance. We couldn't verify specifics, so ask your managing agent before ordering.
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Licensing & safety
Contractor licensing and lead paint
Two rules protect NYC homeowners before any work starts.
Home Improvement Contractor license
NYC's Department of Consumer and Worker Protection requires a Home Improvement Contractor license for construction, repair, remodeling or other home improvement work on residential buildings in the city. Check a contractor's license with the agency before signing anything.
- Ask for the license number and verify it with DCWP
- Get a written contract that lists the product, size and install scope
Lead paint
Local Law 1 of 2004 presumes paint in pre-1960 buildings with three or more units is lead-based unless tested otherwise. Separately, EPA's lead renovation rule applies to paid work that disturbs paint in pre-1978 homes, requiring EPA-certified firms and lead-safe work practices.
- Ask any installer for their EPA lead-safe firm certification
- Owners of covered buildings should check HPD's paint-testing guidance
Before you sign
Buying windows in New York
These NYC questions sit on top of the general checklist in our guide to vetting a window installer.
Ask whether LPC or DOB approval is needed, and who files it
If your building is landmarked or in a historic district, get approval before ordering; custom windows are hard to return. Get the installer to state who prepares and submits the application.
Check window guard compatibility in multiple dwellings
If your building must provide window guards, ask the installer how new windows will accommodate them. We couldn't verify a technical standard, so rely on the owner's or managing agent's guidance.
Compare frame materials for your building type
Our retrofit vs. full-frame guide and material comparison explain the trade-offs. Landmark rules may restrict material choices.
Don't rely on a federal credit or an unverified rebate
The federal 25C credit ended for installs after December 31, 2025, and we couldn't verify a current NYC homeowner window rebate. Check Con Edison's incentive viewer and NYSERDA for current offers before you buy.
Pricing varies widely by home, product and installer. For national price ranges see our 2026 window replacement cost breakdown.
FAQ
New York City window replacement questions
Do I need a permit to replace windows in NYC?
It depends. DOB rules say replacing existing windows doesn't require a work permit if they aren't on a lot line, the masonry opening isn't changed, required light and ventilation aren't affected, and operable area stays the same. Fire-rated windows, lot-line windows and size changes need permits. Verify with DOB or a licensed professional, and landmarked buildings also need LPC approval.
Do I need Landmarks approval?
If your property is an individual landmark or in a historic district, window and door changes need Landmarks Preservation Commission approval. Ordinary repair, like replacing broken glass or caulking, generally does not.
Does my window contractor need a license?
Yes. NYC's Department of Consumer and Worker Protection requires a Home Improvement Contractor license for home improvement work on residential buildings. Verify the license before you sign.
What are window guards and do they affect new windows?
Health Code §131.15 requires owners of multiple dwellings to provide approved window guards in apartments where a child aged 10 or younger lives, and on hallway windows. Ask your building's owner or managing agent how new windows should accommodate them.
Is lead paint a concern when replacing windows?
It can be. NYC presumes paint in pre-1960 buildings with three or more units is lead-based unless tested otherwise, and EPA's lead renovation rule covers paid work that disturbs paint in pre-1978 homes. Hire an EPA-certified firm.
Can I still get a federal tax credit for windows?
No. The federal Energy Efficient Home Improvement Credit doesn't apply to windows placed in service after December 31, 2025. Check Con Edison and NYSERDA for any current incentives.
Window replacement guides by city
Sources & last checked October 2026
Codes, permits and incentives change. Confirm with your local building department and installer before you sign.
- NYC Landmarks Preservation Commission: permits and alterations
- LPC: Windows fact sheet
- NYC DCWP: Home Improvement Contractor license checklist
- NYC Health Code §131.15 (window guards)
- NYC HPD: lead paint testing requirement
- EPA: Lead Renovation, Repair and Painting Program
- IRS: Energy Efficient Home Improvement Credit
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