NYC Alteration Agreements: What Every Co-op & Condo Owner Needs to Know

What Is an Alteration Agreement?

An alteration agreement (also called an "alteration agreement and license") is a contract between you (the shareholder or unit owner) and the cooperative or condominium corporation. It defines the terms under which you're permitted to conduct renovation work in your unit.

Think of it as the building's renovation rulebook, customized to your specific project. Signing it doesn't mean the board approves the aesthetics of your renovation — it means you've agreed to follow the building's rules while doing the work.

What Does an Alteration Agreement Cover?

• Scope of work: A description of the renovation being approved. Changes outside this scope require amendment.
• Contractor requirements: Licensing (typically DCWP in NYC), insurance minimums, and any approved contractor lists.
• Insurance requirements: Typically general liability ($1M–$2M per occurrence / $2M–$4M aggregate), workers' compensation, and sometimes umbrella coverage. The cooperative corporation and management company are named as additional insured.
• Work hours: Usually Monday–Friday, 8am or 9am to 5pm. Weekends almost always prohibited.
• Rules about common areas: How materials are moved in and out, elevator usage, protection of lobby and corridors.
• Noise and dust protocols: Soundproofing requirements, dust barrier requirements, impact notification requirements.
• Financial requirements: A renovation deposit (typically $500–$2,000) held by the building and returned after inspection. Some buildings charge daily fees for elevator use or engineer inspection.
• Liability: If your renovation damages common areas or a neighboring unit, you are responsible, not your contractor directly.
• Restoration obligations: Some agreements require that alterations be undone when the apartment is sold, if the buyer requests.

What Contractors Need to Provide

Before any work begins, the building typically requires your contractor to provide:

• Certificate of Insurance (COI): This is the proof of insurance document. It must name the co-op or condo corporation and management company as additional insured.
• DCWP license number: The NYC Department of Consumer and Worker Protection license, which is required for all home improvement contractors performing over $200 of work in NYC.
• Workers' compensation certificate: Proof that all workers on the job are covered.
• Signed copy of the alteration agreement: The contractor must sign, acknowledging they've read and agree to follow the building's rules.
• Proof of permits (when required): For work requiring NYC DOB permits, proof of permit filing or issuance may be required before work starts.

Common Timeline Mistakes That Delay Renovations

• Not requesting the alteration agreement package from the managing agent before hiring a contractor: The package tells you exactly what's needed. Get it first.
• Assuming board approval is fast: Many co-op boards meet monthly. If you miss the submission deadline for one meeting, you wait another month.
• Having a contractor who can't provide COI quickly: Getting the right COI (especially adding the building as additional insured with correct language) can take 24–72 hours from an insurance company. If your contractor uses a slow broker, this delays everything.
• Starting "minor" work before approval: Even work that seems cosmetic can require approval depending on the building. Starting unapproved work risks a stop-work order and disciplinary action from the board.
• Scope creep during the project: If your approved scope says "bathroom renovation" and you decide mid-project to also redo the hallway, you need a scope amendment. Do it proactively.

Condo Alteration Agreements vs. Co-op: Key Differences

Condo owners have more rights than co-op shareholders — they own their unit outright, not shares in a corporation. This means:

• Condos typically have fewer restrictions on interior renovations than co-ops
• The approval process is often faster and less involved at condos
• However, condo boards still control common areas, and most require COI and work-hours compliance
• Condos cannot generally require board approval for cosmetic interior changes (paint, flooring, fixtures) the way co-ops can
• That said, any work affecting plumbing, electrical, or structure typically requires notification and sometimes approval at both co-ops and condos

Working with a Contractor Who Knows the Process

The easiest renovations in Manhattan co-ops and condos happen when the contractor is experienced with the process. This means they can:

• Review the alteration agreement before signing and flag any unusual or problematic clauses
• Have COI issued quickly with proper additional insured language
• Coordinate with the managing agent proactively, not reactively
• Keep the renovation within approved scope — or proactively amend when scope changes
• Respect building rules for elevator use, work hours, and common area protection without needing to be reminded

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