What Is an Alteration Agreement — and Can Your Renovation Company Handle It for You?

If you’re planning a renovation in a NYC co-op or condo, you’ll need to understand what a NYC co-op alteration agreement is — and whether you can hand the entire process off to someone else.

The short answer: yes, a full-service renovation company can handle the alteration agreement process for you, from document preparation through board approval. But most don’t. Understanding what’s involved will help you know what to ask — and what to demand — before you sign with anyone.

At a glance

• Get the current alteration agreement from your managing agent first — buildings update these documents regularly, and outdated versions can derail your submission.
• Prepare a complete, professional submission package — including architect plans, contractor licenses, and insurance certificates naming the board as additional insured.
• Expect a multi-step approval process — involving building architect review, board questions, and potential modifications before you get the green light.
• Ask whether your contractor actually handles this process — most leave it to you or your architect, while full-service companies manage everything from document prep through board approval.
• Work with a team that has a track record in NYC buildings — in 25 years, MyHome has never been turned down by a residential building in Manhattan or Brooklyn.

What Is an Alteration Agreement?

Short answer: An alteration agreement is a binding contract between you and your co-op or condo board that spells out the rules, responsibilities, and requirements for your renovation.

Think of it as the building’s terms of service for construction. It covers everything from insurance minimums to work hours to who pays if something goes wrong. Every co-op and condo has one, and you’ll need to sign it — and follow it — before any real work begins.

The agreement protects the building and your neighbors. Renovations in NYC apartment buildings are inherently disruptive: workers in the service elevator, noise through pre-war plaster walls, the risk of water damage or electrical problems that could affect the unit below. The alteration agreement creates accountability.

Each building’s agreement is different. A pre-war co-op on the Upper West Side might run forty pages with addenda covering everything from terrazzo floor protection to plaster medallion preservation. A postwar condo in Brooklyn Heights might be ten pages. Most buildings also have separate “house rules” that govern specifics like freight elevator scheduling, debris removal through the service entrance, and summer-only work windows. Your managing agent will provide the current version — and it’s critical to get the most recent one, since buildings update these regularly.

Alteration Agreement vs. Decoration Agreement

Short answer: A decoration agreement covers cosmetic work (painting, flooring, cabinet swaps). An alteration agreement covers anything that touches structure, plumbing, electrical, or walls.

The distinction matters because decoration agreements are faster and simpler. In many Manhattan and Brooklyn buildings, the managing agent can approve cosmetic work within a week, sometimes without full board review. Alteration agreements require the full approval process — architect review, board meetings, potentially months of back-and-forth.

If you’re unsure which your project requires, ask your managing agent before you start planning. Submitting the wrong paperwork — or starting work without any approval — can halt your project and create real problems with your board.

What’s Actually in a NYC Co-op Alteration Agreement?

Short answer: Standard clauses cover timelines, prohibited work, insurance requirements, security deposits, work schedules, and DOB permitting protocols — plus building-specific rules that vary widely.

Standard clauses you’ll see in most buildings

• Timeline: Hard start and stop dates. Most buildings fine you if you run long.
• Insurance requirements: Your contractor must carry liability insurance up to a specified amount, with the board and managing agent named as additional insureds. In New York City, home improvement contractors must also be licensed through the Department of Consumer and Worker Protection.¹
• Security deposit: Typically $5,000 or 10-15% of your project cost, refundable if you follow the rules and don’t damage common areas.
• Work schedule: Usually weekdays only, 9-5 or similar. Many Upper East Side and Upper West Side co-ops restrict renovations to summer months when the building empties out.
• Extension procedures: How to request more time if your project runs long — and what it will cost you.
• DOB permitting protocol: Requirements for city permits and inspections. The NYC Department of Buildings classifies alterations by type and scope, determining which permits you’ll need.²

Building-specific rules that often surprise owners

Beyond the standard clauses, most alteration agreements include “house rules” that reflect the building’s particular concerns:

• Wet-over-dry restrictions: Many buildings prohibit putting kitchens or bathrooms over living spaces in the unit below, due to water damage risk. This is especially strict in pre-war co-ops throughout Manhattan.
• Washer/dryer limitations: Older buildings — including most pre-war co-ops in Chelsea, Greenwich Village, and the Upper West Side — often can’t accommodate modern washing machine drainage.
• Electrical upgrade restrictions: Your building may not have capacity for the electrical upgrades you want. Many pre-war buildings require new wiring to run through the building core rather than along the facade.
• Lead and asbestos testing: Pre-war buildings often require environmental testing before work begins. The EPA’s Renovation, Repair, and Painting (RRP) Rule requires lead-safe work practices in housing built before 1978.³
• Gas line restrictions: Moving gas lines requires building-wide shutdowns that affect your neighbors — and Con Ed retesting that can take months.

The Co-op Board Approval Process — Step by Step

Short answer: Expect a multi-step process involving your managing agent, the building’s architect or engineer, and the board itself. Timeline ranges from one month (simple projects, efficient boards) to a year (apartment combinations, layout changes).

Step 1 — Get the current alteration agreement from your managing agent

Your first call is to the managing agent. Request the most recent version of the alteration agreement and any house rules.

Step 2 — Prepare the submission package

The typical submission includes:

• A formal letter to the board describing the proposed work
• Your architect’s plans and drawings
• Your contractor’s license and insurance certificates (with the board and managing agent named as additional insureds)
• Projected schedules for each phase of the project

This package needs to be complete and professional. Sloppy submissions signal to the board that your project will be sloppy too.

Step 3 — Building architect/engineer review

The board will hire its own architect or engineer — at your expense — to review your plans. They’re checking for code compliance, structural concerns, and anything that violates building rules.

Step 4 — Board review, questions, and negotiation

Once the building’s professional signs off, the board reviews your application. Expect questions. Expect concerns. Expect back-and-forth.

Pro tip: Have your contractor or architect meet with the building super before you submit. The super knows what the building will and won’t accept — including the gray areas that aren’t written down.

Step 5 — Approval (with conditions, usually)

Outright rejection is rare unless your plans violate DOB code. More commonly, boards approve with modifications: different timelines, additional soundproofing, restricted work hours.

Can a Renovation Company Handle the NYC Co-op Alteration Agreement for You?

Short answer: Yes — but most contractors leave this work to you or your architect. A true full-service renovation company handles the entire process, including document preparation, managing-agent coordination, and board communication.

What “full-service” actually means for board approvals

When a renovation company says they handle alteration agreements, ask what that means specifically:

• Do they prepare the submission documents? Or do they hand you a checklist and wish you luck?
• Do they coordinate directly with your managing agent? Or do you become the go-between?
• Do they manage DOB filings and inspections? Or is that someone else’s job?

The difference between “we’ll help with the alteration agreement” and “we manage the entire alteration agreement process” is the difference between having a contractor and having a partner.

Why this matters more in NYC than anywhere else

NYC renovations involve layers of approval that don’t exist elsewhere: DOB permits and inspections, building-specific alteration agreements, managing agents with their own requirements, and sometimes Landmarks Preservation Commission review for buildings in historic districts. The city’s DOB NOW system handles permit applications electronically, but navigating it requires familiarity with NYC’s specific filing requirements.⁴

Questions to ask any contractor about their board-approval track record

Before you hire anyone, ask:

1. Have you worked in my building type (co-op vs. condo, pre-war vs. postwar)?
2. How many board applications have you submitted in the past year?
3. Who on your team prepares the submission package?
4. Who coordinates with the managing agent during the approval process?
5. Who handles DOB filings and inspections?

The answers will tell you whether you’re hiring a contractor or a project manager.

How MyHome Handles Alteration Agreements in Manhattan and Brooklyn

Short answer: We manage the entire alteration agreement process — document prep, managing-agent coordination, building architect liaison, DOB filings — so you deal with three people, not seven.

The 3-person relay: who you’ll actually work with

When you work with MyHome, you’ll have three points of contact across your project:

1. Your Renovation Expert assesses your apartment, understands your goals, and provides an itemized labor proposal.
2. Your Designer helps you select materials, fixtures, and finishes at our Midtown showroom.
3. Your Project Manager leads the project from the kickoff meeting through completion, including all board and DOB coordination.

You’re never wondering who to call.

Our track record: never turned down by a residential building

In 25 years of renovating apartments across Manhattan and Brooklyn — from pre-war co-ops on the Upper East Side to postwar condos in Tribeca to brownstone conversions in Brooklyn — MyHome has never been turned down by a residential building.

That’s not a guarantee that any specific board will approve your specific project — boards have broad discretion, and every building is different. But it’s a track record that reflects process maturity: we know what boards want to see, we know how to prepare packages that get approved, and we know how to navigate the back-and-forth without burning bridges.

What we manage so you don’t have to

• Alteration agreement document preparation
• Managing-agent coordination and communication
• Building architect/engineer liaison
• DOB permit filings and inspection scheduling
• Insurance documentation with proper naming conventions
• Board question responses and modification negotiations

You focus on design decisions. We handle the paperwork — and we protect your floors, walls, and building hallways throughout the entire project.

What Can Go Wrong — and How to Protect Yourself

Short answer: Unauthorized renovations can result in fines, halted work, forced reversal of completed work, and liability for damage — problems that follow the apartment, not just the owner.

The cost of unauthorized renovations

If you do work that’s not covered by your alteration agreement — or start work before approval — your project can be halted indefinitely. Workers can be denied building access. You may be forced to reverse completed work at your own expense.

DOB violations don’t disappear when you sell. They follow the apartment and can delay or derail future sales. The NYC Department of Buildings tracks violations by property, and unresolved issues can block future permit applications.⁵

Common board objections and how to address them

Boards rarely reject renovations outright. More often, they ask for modifications:

• Wet-over-dry concerns: Show that plumbing fixtures stay in the original footprint, or propose state-of-the-art waterproofing measures.
• Noise concerns: Offer soundproofing in floors or walls.
• Timeline concerns: Demonstrate a realistic schedule with contingency built in.
• Electrical concerns: Work with the building to understand capacity limitations before finalizing plans.

The key is anticipating concerns and addressing them proactively — which is easier when your renovation team has done this before, in your building type, in your neighborhood.

Frequently Asked Questions

How long does co-op board approval take in NYC?
Simple projects with efficient boards: about a month. Complex work like apartment combinations or major layout changes: up to a year. Most projects fall somewhere in between.

What’s the difference between an alteration agreement and a decoration agreement?
Decoration agreements cover cosmetic work (painting, flooring, cabinet swaps). Alteration agreements cover anything touching structure, plumbing, electrical, or walls.

Can I start renovation work before the board approves my alteration agreement?
No. Starting work without approval can result in halted projects, fines, and forced reversal of completed work.

Who prepares the alteration agreement documents?
It depends on your contractor. Some leave this entirely to you or your architect. Full-service companies like MyHome prepare and submit the complete package.

Ready to Hand Off Your Alteration Agreement?

Navigating your building’s approval process shouldn’t be your second job. When you work with MyHome, we manage the entire alteration agreement process — from document prep through board approval — so you can focus on the renovation itself.

In 25 years of renovating apartments across Manhattan and Brooklyn, we’ve never been turned down by a residential building. That experience — and our 10-year written warranty — is yours when you work with us.

Need your co-op alteration agreement handled for you? Book a free consultation.

Have questions about your building’s specific requirements? Call us at 212.666.2888 or visit our Midtown showroom to talk through your project in person.

Sources

1. NYC Department of Consumer and Worker Protection. “Home Improvement Contractor License.” https://www.nyc.gov/site/dca/businesses/license-checklist-home-improvement-contractor.page
2. NYC Department of Buildings. “Alterations & Renovations.” https://www.nyc.gov/site/buildings/homeowner/alterations-renovations.page
3. U.S. Environmental Protection Agency. “Renovation, Repair, and Painting Program.” https://www.epa.gov/lead/renovation-repair-and-painting-program
4. NYC Department of Buildings. “DOB NOW.” https://www.nyc.gov/site/buildings/industry/dob-now.page
5. NYC Department of Buildings. https://www.nyc.gov/site/buildings/index.page