Table of Contents
- Nearly every co-op and condo requires a signed alteration agreement and board or managing agent approval before work begins.
- Contractors must provide insurance certificates naming the building; requirements differ and should be checked before bidding.
- Work hours are commonly weekdays only, roughly 9 AM to 5 PM, and freight elevators are reserved in advance.
- Hard flooring often requires sound-rated underlayment meeting a minimum IIC rating; ask for the tested assembly.
- Reported DOB changes in 2026 reinstated a board attestation in DOB NOW: Build. Confirm with the DOB and your managing agent.
If you own an apartment in New York City, you do not own the box around you the way a house owner does. You own shares in a corporation or a unit in a condominium, and the building decides how, when and by whom that unit can be changed. That is not a defect; it is how shared walls, shared risers and shared nerves stay manageable. But it does mean that a renovation here starts with a different question than in most places. Before "what do I want," the question is "what is the building going to allow."
This guide explains the typical rules co-ops and condos use, the paperwork they ask for, the steps from idea to approved plans, and the traps that cost shareholders money. It is based on common NYC practice as of October 2026. Every building is different, and your proprietary lease, bylaws, house rules and managing agent control. Nothing here is legal advice.
1. Co-op vs. Condo: What Is Different for Renovators
The two structures feel similar to a resident and behave differently on paper.
| Feature | Co-op | Condo |
|---|---|---|
| What you own | Shares in a corporation plus a proprietary lease | A deed to the unit |
| Governing documents | Proprietary lease, bylaws, house rules | Declaration, bylaws, house rules |
| Approval authority | Board, often through the managing agent | Board or managing agent, sometimes less discretionary |
| Typical strictness | Often stricter, with broader discretion | Varies, often more standardized |
| Alteration agreement | Almost always required | Almost always required |
In both cases, the board or managing agent has an interest in protecting building systems, neighbors and insurance. Co-ops tend to have wider discretion to say no, and condos more often have set procedures. Either way, the first move is to request the alteration policy and application from the managing agent.
2. The Standard Approval Path, Step by Step
Most buildings follow some variation of this sequence.
- Request the renovation package. Ask the managing agent for the alteration agreement, house rules, insurance requirements, fee schedule and application form.
- Define the scope. A written scope, with drawings if walls, plumbing, gas or electrical change, comes first.
- Hire a design professional if needed. Work that alters layout, plumbing or structure usually requires plans prepared by a New York State-registered Professional Engineer or Registered Architect.
- Collect contractor documents. License, insurance certificates and references.
- Submit the package. Application, drawings, contractor information, certificate of insurance and fees.
- Building review. The building's architect or engineer may review and issue comments.
- Board decision. The board approves, conditionally approves or asks for revisions.
- Sign the alteration agreement. Do this before work begins.
- File with the DOB where required. See section 4 below.
- Schedule work. Reserve freight elevator time and give notice to neighbors.
- Close-out. Final inspection, sign-offs and return of deposits.
Our guide to condo gut renovation board approval steps in NYC details the same path for larger projects, and ten golden rules before starting your home renovation project adds general planning advice.
3. What an Alteration Agreement Usually Says
The alteration agreement is the contract between you and the building. Read it closely. Common provisions include:
- Scope of approved work. Only what is listed and drawn is approved. Adding a wall later may require a new approval.
- Approved contractors or vendors. Some buildings maintain lists or require specific trades.
- Insurance. Minimum limits, additional-insured language and duration.
- Deposits and fees. Refundable security deposits, plus review fees that are not refundable.
- Work hours and noise. Days and times work is allowed, and quiet hours.
- Debris and elevators. Required protections, debris routes and charges for freight elevator use.
- Indemnification. You agree to cover damage the work causes to other units or common areas.
- Compliance. Obligations to obtain DOB permits where required and to deliver sign-offs afterward.
- Closeout. Documents required before the deposit is returned.
Read more in alteration agreements for NYC co-ops and condos. If anything is unclear, ask the managing agent or an attorney experienced in co-op law before signing.
4. DOB Filings and the Board Attestation
Board approval and city permits are separate tracks that increasingly overlap.
Most construction in NYC needs a Department of Buildings permit, filed through DOB NOW: Build by a New York State-registered Professional Engineer or Registered Architect acting as Applicant of Record. The DOB explains the basics on its how to obtain a permit page. Cosmetic work, such as painting, generally does not need a DOB permit, but the building may still require notice and insurance.
Industry reports indicate that DOB reinstated, effective January 26, 2026, a board attestation inside DOB NOW: Build confirming that alterations are board-approved. This is reported information, so confirm the current requirement with the DOB and your managing agent. Practically, it means a board approval letter or form often has to exist before the filing is signed off.
For more on the filing side, see NYC renovation permits explained, DOB NOW: Build explained for homeowners, how long a building permit takes in NYC and the NYC electrical permits guide. Landmarked buildings add the Landmarks Preservation Commission; see LPC permits for renovation in historic districts.
5. Insurance and Contractor Requirements
Insurance is the part of the package most likely to be rejected the first time. Buildings typically want:
- Commercial general liability. With limits set by the building and often with the building and managing agent named as additional insureds.
- Workers' compensation and disability coverage. For all workers on site.
- Umbrella or excess liability. Required by some buildings on larger projects.
- Certificate holder language. Exact wording matters; ask for the sample from the managing agent.
- Contractor license. Residential remodeling in NYC requires a Home Improvement Contractor license from the Department of Consumer and Worker Protection.
Our guide to certificates of insurance for NYC renovations explains how to read and request them. The DCWP's HIC license checklist explains the license requirement. For vetting a contractor, use the hire a renovation contractor checklist.
6. Hours, Noise, Elevators and Neighbors
Buildings protect residents from disruption in several ways.
- Work hours. Commonly weekdays only, roughly 9 AM to 5 PM, with no weekends or holidays. NYC's Noise Code generally limits construction to weekdays around 7 AM to 6 PM unless an after-hours variance is approved, and building rules are often stricter.
- Freight elevator. Reserved in advance, with limits on duration and sometimes fees. Materials and debris must travel through it, not the passenger elevators.
- Protection. Hallways, elevators and lobbies are covered; floors and walls are protected.
- Deliveries. Scheduled with building staff. Loading zones or docks may be limited.
- Debris. Bagged, removed daily or according to building policy.
- Neighbor notice. Posting a notice of work dates and noise expectations is often required, and always good practice.
Plan the schedule around these windows. A crew that can only work seven hours a day, five days a week needs a longer calendar than a house project of the same size.
7. Flooring, Plumbing, Gas and Walls: What Boards Scrutinize
Certain changes attract more attention because they affect neighbors or shared systems.
Flooring
Hard flooring is the number-one subject of neighbor complaints. Buildings often require a minimum Impact Insulation Class rating, approved sound-reduction underlayment and limits on uncovered floor area. Our co-op flooring rules guide explains how those ratings work. Ask for the tested assembly, not only the product claim.
Plumbing and kitchens
Moving a sink, adding a washer or relocating a kitchen typically requires engineering review, because it touches risers and drains shared with other units. Wet-over-dry rules, which limit placing wet rooms above neighbors' living spaces, apply in some buildings. For kitchen projects, see our kitchen remodeling page.
Gas
Gas work must be done by licensed trades and complies with city rules. New residential gas detector requirements take effect January 1, 2027 under Local Law 102 of 2025 near gas-fed appliances; confirm details with the DOB.
Walls and structure
Removing or moving walls requires engineering confirmation of what is structural. Window replacements, balconies and exterior changes are typically controlled by the building as well, because they affect the facade.
8. Neighborhoods and ZIP Codes We Serve
Rules are building by building, but certain neighborhoods share patterns.
- Chelsea (Manhattan), ZIPs 10001, 10011. Pre-war and new-build condos plus Chelsea Historic District townhouses, with strict building rules. Landmark rules may apply to exteriors. See our Chelsea luxury apartment renovations page.
- Sheepshead Bay (Brooklyn), ZIP 11235. Waterfront homes and co-ops with flood-zone considerations. Co-op boards and flood-resistant materials may both apply.
- Fresh Meadows (Queens), ZIPs 11365, 11366. Garden apartments, detached homes and co-ops. Garden co-ops often have standardized alteration policies and limits on flooring changes.
- Westerleigh (Staten Island), ZIP 10314. Detached homes and large lots. Most projects are houses, so the DOB and the owner decide, not a board.
- East Meadow (Nassau County, Long Island), ZIP 11554. Ranches and capes in the Town of Hempstead. Permits come from the local building department rather than the city.
- Union City (Hudson County, NJ), ZIP 07087. Dense multifamily row houses and walk-ups. Permits come from the municipal construction office under New Jersey's Uniform Construction Code; see New Jersey building permits: UCC guide for homeowners and New Jersey renovation contractors near NYC.
For Long Island, our Nassau County renovation permits guide and Suffolk County renovation permits guide explain local requirements. For budgeting your board-related costs, see what a renovation costs in NYC in 2026 and the renovation ROI calculator.
9. Mistakes That Delay Approval or Create Disputes
- Starting before signing. The most common and most expensive mistake.
- Incomplete packages. Missing drawings or insurance certificates restart the clock.
- Wrong insurance wording. A certificate that misses the additional-insured language is returned.
- Underestimating the board calendar. If the board meets monthly, a missed deadline costs weeks.
- Changing scope mid-project. Adding a wall or moving a fixture without an amendment can create violations.
- Ignoring neighbors. A friendly note and a clear schedule prevent complaints that can turn into stop-work requests.
- Skipping close-out. Without final sign-offs, deposits stay held and future sales can be complicated.
- Choosing flooring before checking sound rules. Returning planks is a costly lesson.
- Not reading the lease. Some proprietary leases restrict certain alterations altogether.
10. Why a Licensed Contractor Beats a Handyman in a Co-op or Condo
Boards are risk-averse. They want to see a contractor who is licensed, insured, experienced in occupied buildings and capable of handling the building's requirements without supervision. A handyman who has never worked in a managed building may be a talented craftsperson and still a poor fit.
The reasons are practical. Insurance certificates must be correct. Dust, noise and debris need containment. Elevators and hallways need protection. Plumbing, electrical and gas work need licensed trades. Damage to a neighbor's apartment is the owner's problem under most alteration agreements, which means a mistake can follow you into your own pocket and your standing with the board.
A professional team brings:
- Familiarity with alteration agreements and board expectations.
- Correct insurance certificates and license documentation.
- A schedule built around approved hours and freight elevator windows.
- Dust control and protection plans that satisfy building staff.
- A single point of contact for the managing agent.
11. How We Work Inside Managed Buildings
N.Y. Renovation Services is a licensed and insured, in-house design-and-build company based on Staten Island. We handle co-op and condo board paperwork as part of the job, from blueprints to the final coat of paint.
What that looks like:
- Early rules check. We ask for your alteration policy, insurance requirements and house rules before we price.
- Coordinated drawings. We work with licensed design professionals when the scope needs plans and filings.
- Package preparation. Alteration agreement forms, insurance certificates, contractor information and scope descriptions are assembled for the managing agent.
- Respect for building staff. We schedule deliveries, protect common areas and keep elevators and hallways clean.
- Close-out. We help you gather final sign-offs so deposits are returned.
Our estimates are itemized and free, with no hidden fees, and building-related costs such as protection, elevator time and supervision fees are shown separately. Many shareholders tell us the board package felt like the hardest part of the project. It does not have to. When we prepare it, you get one organized submission rather than a stack of forms from five vendors, and the managing agent gets a single contact who answers questions in the building's own terms. We also review your scope against the house rules before you commit to finishes, so you do not discover after the fact that the stone floor you chose needs a sound underlayment the board will not accept. That kind of early catch is usually worth more than any discount on materials.
We also donate 5 percent of total project cost to a nonprofit of your choice. If you want us to prepare the package, request an estimate and mention your building.
12. Next Steps: Get Your Free Estimate
The best first step is to get your building's renovation package from the managing agent and send us a copy with a short description of your project. We will review it, tell you what to expect and provide a written, itemized estimate.
Use the quote form, call or text (347) 455-1741, or visit our Staten Island office at 1 Teleport Dr. We are open Monday through Saturday, 8:00 AM to 5:00 PM. Regulatory and building information in this guide is general and current as of October 2026; your building's documents and the agencies themselves govern.
Safety Note: All work follows OSHA 30 safety and EPA Lead-Safe practices for pre-1978 homes. Check local permit requirements before starting.
James - Lead Renovation Editor. With over 20 years in renovation and construction, James writes and edits our guides. More about James