Manhattan renovations move fast when permits are handled correctly: and stall when they're not. The New York City Department of Buildings (DOB) regulates construction work across all five boroughs, and understanding when your project requires DOB approval is critical to avoiding fines, stop-work orders, and delays that can add months to your timeline.
Most apartment renovations in Manhattan: especially kitchen and bathroom remodels: require DOB permits. The distinction between work that needs professional filing and work that doesn't often confuses homeowners and property managers. This guide clarifies those requirements, explains the difference between Alt-2 and Alt-3 filings, and walks you through the DOB NOW system so you can plan your renovation with confidence.
When Your Manhattan Renovation Requires a DOB Permit
The DOB requires permits for any work that affects the structural integrity, safety systems, or occupancy of a building. If your renovation involves changes to plumbing, electrical, gas, HVAC, or structural elements, you will need DOB approval before starting work.
Permit-required work includes:
- Removing or relocating walls, beams, or structural supports
- Electrical upgrades: adding or relocating 10+ outlets, upgrading circuit breaker panels, or rewiring
- Plumbing changes: moving sinks, toilets, tubs, showers, or adding new fixtures
- Gas line work: rerouting, extending, or installing new gas piping
- HVAC modifications or new mechanical systems
- Window or door replacements
- Roof work or structural repairs
- Changes to building use, occupancy, or square footage
- Basement conversions or egress window installations
Most kitchen and bathroom renovations in Manhattan require Alt-2 permits because they involve plumbing relocation, electrical upgrades, or gas work. Even if you're keeping the same layout, upgrading electrical panels or replacing old plumbing often triggers permit requirements.
Work That Does Not Require DOB Approval
Purely cosmetic work does not require DOB permits. If you're refreshing surfaces without altering systems or structure, you can proceed without filing.
Non-permitted cosmetic work includes:
- Painting or plastering walls and ceilings
- Refinishing or replacing flooring (without structural changes)
- Replacing cabinets in the same location (no plumbing or electrical changes)
- Installing new countertops without moving fixtures
- Changing light fixtures (using existing junction boxes)
- Installing non-structural partitions or shelving
Property managers coordinating unit turnover work can handle painting, flooring, and cabinet replacements without DOB involvement: as long as no systems are touched.
Alt-2 vs Alt-3 Filings: What's the Difference?
The DOB categorizes residential renovation permits into three types: Alt-1, Alt-2, and Alt-3. Understanding which filing type your project requires helps you plan timelines and budgets accurately.
Alt-1 (Major Alterations):
Reserved for projects that change a building's use, occupancy classification, or egress requirements. Examples include converting a single-family home into a multi-family building or adding new dwelling units. Most apartment renovations do not fall into this category.
Alt-2 (Ordinary Alterations):
The most common permit type for Manhattan apartment renovations. Alt-2 filings cover work that involves multiple building systems: plumbing, electrical, structural, or mechanical: without changing the building's occupancy or use.
Alt-2 projects typically include:
- Full kitchen renovations with plumbing and electrical changes
- Bathroom remodels involving fixture relocation or new plumbing
- Combining apartments or reconfiguring layouts
- Installing new HVAC systems or upgrading electrical panels
- Structural work like removing non-load-bearing walls
Alt-3 (Minor Alterations):
Used for smaller, single-trade projects that don't affect multiple systems. Alt-3 filings are faster and less expensive than Alt-2, but they're limited in scope.
Alt-3 projects include:
- Window replacements (same size, same location)
- Roof repairs or re-roofing
- Façade restoration or exterior work
- Installing new doors without structural changes
- Minor HVAC equipment replacement
Key distinction: If your renovation touches plumbing, electrical, and structural elements in the same project: such as a typical Manhattan kitchen remodel: you'll need an Alt-2 filing. If you're only replacing windows or doing exterior work, Alt-3 may apply.
The DOB NOW Filing Process: Who Can File and How Long It Takes
New York City transitioned to the DOB NOW: Build electronic filing system, which requires licensed professionals to submit applications on behalf of property owners. Homeowners and property managers cannot file permit applications directly.
The DOB filing process includes these steps:
-
Hire a licensed professional: We partner and collaborate with licensed architects and engineers as needed to prepare permit drawings and stamped plans that meet DOB code requirements.
-
Submit via DOB NOW: Build: Your design professional files the application electronically through the DOB NOW portal, uploading plans, specifications, and supporting documentation.
-
Secure trade permits: Licensed master plumbers must file plumbing permits. Licensed electricians must file electrical permits. Gas work requires a licensed master plumber with gas endorsement.
-
DOB plan review: The DOB reviews submitted plans and issues objections if changes are required. Your design team responds to objections and resubmits corrected plans.
-
Permit issuance: Once the DOB approves all plans and objections are cleared, the work permit is issued.
-
Inspections and sign-off: The DOB inspects work at designated milestones (rough-in, final). After passing final inspection, the DOB issues a sign-off and the project is complete in their records.
Timeline expectations:
Simple Alt-3 permits may clear in 2–4 weeks. Standard Alt-2 permits typically take 1–3 months from submission to approval. Complex projects requiring zoning analysis, landmark approvals, or variance requests can take several months.
Co-op and Condo Board Approval Comes First
If your Manhattan apartment is in a co-op or condo, building board approval is required before DOB filing: and board requirements are often stricter than city code.
Most co-op and condo boards require:
- Detailed renovation plans and scope of work
- Contractor insurance certificates (general liability, workers' compensation)
- Alteration agreement signed by owner and contractor
- Board review meeting or written approval
- Security deposit (refundable upon completion)
- Work hour restrictions and building access rules
As of January 26, 2026, new DOB attestation rules require condo and co-op boards to provide attestation in DOB NOW before permit filing. This means your board must confirm they've reviewed and approved your renovation plans as part of the city's permit process.
Property managers coordinating multiple unit renovations should plan for board approval timelines: often 2–4 weeks: before starting the DOB filing process.
Historic Districts and Landmark Properties
If your building is located in a designated historic district or is an individual landmark, you'll need Landmarks Preservation Commission (LPC) approval before filing DOB permits.
LPC review applies to:
- Exterior work visible from the street
- Window replacements
- Façade changes or repairs
- Rooftop additions or modifications
Interior work in landmark buildings typically does not require LPC approval unless it affects protected interior features. The LPC review process adds 1–3 months to your timeline depending on the scope and district.
Why Professional Filing Matters for Manhattan Renovations
DOB filings require technical knowledge of building codes, zoning regulations, and construction standards. Mistakes in permit applications lead to objections, resubmissions, and delays that extend your renovation timeline and increase costs.
Professional filing ensures:
- Code-compliant plans that pass DOB review on the first submission
- Proper coordination between architects, engineers, and trade contractors
- Accurate documentation that protects you during DOB inspections
- Faster approvals and fewer objections
Corniel Construction LLC coordinates DOB filings for apartment renovations across Manhattan. We partner and collaborate with licensed architects and engineers as needed to manage the full permit process: from initial board approval through final DOB sign-off: so your project stays on schedule and compliant with city regulations.
Plan Your Renovation with Confidence
Understanding DOB permit requirements before you start planning saves time, reduces costs, and prevents the stress of mid-project delays. Whether you're renovating a kitchen, remodeling a bathroom, or managing a full apartment gut renovation, knowing when you need an Alt-2 filing and how long the process takes helps you set realistic expectations.
If you're planning a renovation in Manhattan and need guidance on permits, board approvals, or DOB filings, Corniel Construction LLC can help. Our team manages the full process: design coordination, permit applications, trade scheduling, and inspections: so you get a compliant, professionally executed renovation.
Schedule Your Consultation or call 917-410-3132 to discuss your project and the filing and construction planning required for the specific scope.