You started thinking about selling. Maybe an agent did a walkthrough and asked questions you couldn’t answer. Maybe a lawyer pulled the building-department records and there’s an open permit from 2007 that you didn’t even know existed, plus a finished basement that the previous owners did before you bought, plus a deck that was inspected once and had a pending follow-up that never happened. Maybe there’s a current notice from the town about the fence height, or the shed setback, or the accessory apartment that you’ve been pretending isn’t an accessory apartment.
Long Island has a complicated relationship with municipal code. This guide is the Long Island answer to the open-violations and unpermitted-work question. The Certificate of Occupancy framework that varies by municipality (and sometimes by neighborhood within a municipality), the legalize-or-remove fork, the disclosure obligations under NY’s 2024 PCDS amendment, and the as-is sale path that closes properties with messy permit histories regularly.
What is selling a house with code violations on Long Island?
Selling a Long Island house with code violations means transferring a property carrying open or expired permits, unpermitted work (often a finished basement or accessory apartment), or active municipal violation notices. Most lenders require a clear Certificate of Occupancy and resolution before funding, which is why retail sales fall through. Cash sales close on properties with open permits and the buyer absorbs the resolution work post-closing.
What “code violation” actually covers
The phrase covers several different categories.
Open or expired building permits
A permit was pulled (electrical, plumbing, structural, mechanical, kitchen renovation, basement finishing, deck, pool, addition, etc.), some inspections may have been performed, but the final inspection was never passed and the permit was never closed. The work might be fully complete and code-compliant, or might be incomplete, or might have failed an inspection that was never followed up.
This is the most common Long Island permit issue. The previous owner pulled a permit for a basement renovation in 2009, the contractor did the work, the rough-in inspection passed, the final inspection was scheduled and either failed or was missed, the permit went into “expired” status, and the file has been sitting open in the building department for fifteen years.
Unpermitted work
Work that should have been permitted under the local code but wasn’t. Common Long Island categories: finished basements, attached or detached garages converted to living space, accessory apartments without a CO for two-family use, decks built without permits, additions, pools, large sheds, fence runs over height limits, kitchen renovations involving electrical or plumbing changes.
The unpermitted-work landscape in Long Island is broad. Many houses have at least some unpermitted improvement, particularly basement finishing and accessory apartment uses. The legalization path involves applying for a permit retroactively, passing current-code inspections (which may require demolition and rebuild of work that’s currently functional but doesn’t meet today’s standards), and paying fees and possibly penalties.
Property maintenance violations
The exterior or general condition violations under the local property maintenance code. Long Island municipalities have adopted variants of the International Property Maintenance Code (IPMC) covering: overgrown grass and vegetation, accumulated debris and storage, peeling exterior paint, broken windows, unsafe steps or porches, unrepaired structural damage visible from public view, accessory structures in disrepair.
These are usually addressable cheaply (mowing, painting, cleanup) and don’t block sale, but the violation history sometimes affects buyer perception.
Zoning violations
Use of the property that doesn’t conform to the zoning designation. Common Long Island patterns: a single-family house being used as a two-family without a CO for the additional unit, commercial use of a residentially-zoned property (home business beyond what’s allowed), accessory dwelling units in jurisdictions that don’t permit them.
Zoning violations can be more complex than building-permit issues because the underlying use, not just the construction, is non-compliant.
Health and safety violations
Lead-based paint hazards, asbestos exposure, septic system failures, well water issues, illegal heating systems. These are typically referred to county health departments (Nassau County Department of Health, Suffolk County Department of Health Services) and have their own enforcement procedures.
The Certificate of Occupancy landscape on Long Island
Long Island’s CO situation is one of the most complex in any U.S. metro, and it’s not optional knowledge if you’re selling.
What a CO is and isn’t
A Certificate of Occupancy is the document the building department issues authorizing the structure (or specific spaces within it) for occupancy. The CO references:
- Year of construction
- Approved use class (single-family residential, two-family, mixed use, etc.)
- Number of bedrooms (sometimes), bathrooms (sometimes), accessory uses (decks, pools, sheds, etc.)
- Approved alterations and additions
Each major alteration or addition typically requires a permit, inspections, and an updated CO (or a Certificate of Completion or Compliance, depending on local terminology) referencing the new work.
A house’s “current CO” should reflect everything that’s there. A house with a 1975 CO showing 3 bedrooms and 1 bathroom, but with a current configuration of 4 bedrooms, 2 bathrooms, a finished basement, an attached deck, and a pool, has substantial CO gap.
Variation across Long Island municipalities
CO requirements vary substantially across Long Island. Generalizing roughly:
Strict CO-on-transfer towns: require a current CO before a property can be sold. Examples include Hempstead, Long Beach, Islip in some categories. Sellers are responsible for obtaining or updating the CO before closing.
CO-required-eventually towns: don’t strictly enforce CO at transfer, but issues will surface when the next owner pulls a permit, files a complaint, or applies for an alteration. Most Long Island towns and villages fall here.
Less strict municipalities: fewer CO-related transfer obligations, more limited enforcement of historic CO gaps. Some far-eastern Suffolk communities historically operated this way, though enforcement has been increasing.
For sellers: check the specific municipality’s requirements. The municipality’s building department website or a call to the department clarifies the local rules.
Suffolk’s particular situation
Suffolk townships have a long history of broad CO enforcement. Babylon, Brookhaven, Islip, and Smithtown all maintain broad CO requirements, and many homes in these townships have CO gaps that surface at sale.
The pattern is structural: Long Island housing stock includes a lot of mid-century construction with subsequent renovations, and CO requirements have expanded in scope over decades. A 1965 ranch might have had its original CO (single-family, 3 bedrooms) and never been updated through subsequent renovations: a finished basement, a converted garage, a deck, a pool. The original CO and the current property no longer match.
Selling exposes this. A buyer’s attorney requests the current CO from the building department. The CO comes back not matching the property. The buyer or their lender requires the gap to be resolved before closing. Sellers either resolve (legalize or de-legalize) or sell to a buyer who accepts the situation.
The legalize, de-legalize, or sell-as-is decision
When unpermitted work or open permits exist, three paths.
Legalize
Apply for a permit retroactively, schedule current-code inspections, pay fees and any applicable penalties, get the permit closed and the CO updated.
This works when:
- The work meets current code (or can be brought up to code at reasonable cost)
- The municipality offers a path for retroactive permits (most Long Island ones do)
- The seller has time and capital for the process
- The expected value increase from a clean CO clearly exceeds the cost
Typical Long Island legalization scenarios:
- Finished basement: pull permit, inspect for ceiling height (most older basements fail current code’s 7-foot minimum, requiring lowering of floor or alternative remedies), egress (every habitable space below grade needs an egress window), electrical (current code wiring), plumbing if any. Cost: $5,000 to $30,000 to legalize, depending on scope and current condition.
- Deck: pull permit, inspect footings, framing, ledger attachment, railings. Many older Long Island decks fail one or more current-code requirements. Cost: $1,500 to $10,000 to legalize, sometimes more if footings or ledger require redo.
- Garage conversion: pull permit (if zoning allows), inspect for living-space code compliance (insulation, ventilation, ceiling height, egress, plumbing if applicable, electrical, HVAC). Cost: $5,000 to $40,000 to legalize, often more.
- Accessory apartment: requires zoning compliance for two-family use, separate kitchen and bathroom code compliance, separate egress, possibly fire-rated separation, parking. Cost: $10,000 to $50,000 to legalize, plus zoning approval which is uncertain in many jurisdictions.
Time: 30 days to 6 months depending on scope and the building department’s queue.
De-legalize
Return the area to its pre-permit-required state. For a finished basement, remove the finishing materials so the basement is no longer “finished.” For a converted garage, restore the garage door and remove the living-space conversion. For an unpermitted deck, remove it.
This works when:
- The work is not worth keeping at the cost of legalization
- The space is not essential to the property’s value
- Demolition is faster and cheaper than legalization
Typical de-legalization costs: $2,000 to $20,000 depending on scope.
Sell as-is
Sell to a buyer who accepts the situation, with full disclosure. Cash buyers (us included) handle this routinely.
This works when:
- Legalization is expensive or uncertain
- Time pressure (estate, divorce, relocation) doesn’t allow 3 to 6 months of resolution work
- The seller doesn’t have capital for legalization
- The buyer is set up to absorb the resolution work
Cash buyers underwrite the resolution cost into the offer. The discount versus a clean-CO sale is typically 5 to 15% of value, depending on scope.
What the buyer’s lender requires
If your buyer is using mortgage financing, the lender will require:
- Current CO matching the property
- Closed permits with no outstanding inspections
- No open property maintenance violations
- No outstanding code-enforcement actions
- Sometimes an Elevation Certificate, septic inspection, well-water test, depending on property characteristics and loan program
FHA, VA, and USDA loans have particularly tight requirements. Conventional loans vary by lender but generally require similar.
This is why retail listings of Long Island homes with permit issues so often fall through: the property goes under contract, the buyer’s lender pulls the records, the records show issues, the seller is asked to resolve before closing, the seller can’t resolve in the contract window, the deal dies. The cash sale path bypasses all of this because no lender is involved.
Disclosure language
Recommended approach for the PCDS attachment:
For known open permits: “Open building permit dated [date] for [scope of work]. Permit status: [open / expired / partially inspected]. Buyer encouraged to obtain building department records and to scope resolution as part of due diligence.”
For known unpermitted work: “[Description of work, e.g., ‘finished basement,’ ‘rear deck,’ ‘accessory apartment’] performed without building permit. Buyer encouraged to obtain building department records and to scope legalization or removal as part of due diligence.”
For known property maintenance violations: “Notice of violation issued by [municipality] dated [date] for [description]. Status: [open / under remediation / closed]. Documentation provided to buyer.”
The pattern: lead with what is known, name the source documents, point the buyer to public records for verification. Cash buyers are comfortable with this disclosure level. Retail buyers are mixed.
How NY Cash Sale handles permit-issue properties
We are a Long Island cash buyer, principal not agent. Permit-issue properties are part of our regular pipeline, particularly Suffolk-area homes with multi-decade renovation histories.
The way it actually goes:
- You submit your address (or call us). Within about 5 minutes, our team calls back.
- The first conversation is roughly 10 minutes. We confirm the basics: where the property is, what you know about open permits or CO gaps, what the rough scope of unpermitted work is, what condition the property is in, and your timeline.
- We pull the building department records as part of our underwriting (sometimes the seller has them already, often we run them ourselves). The records come back with the actual scope of issues, which is sometimes broader and sometimes narrower than the seller assumed.
- We schedule a walkthrough. Sight-unseen offers are possible for permit-issue properties when the records are clear and the structure is otherwise routine.
- Within 24 hours of the walkthrough we send a written cash offer. The offer accounts for the underwritten legalization, de-legalization, or remediation scope.
- If you accept, we sign a contract with a 10% non-refundable deposit. Standard contract language with appropriate disclosure of the known permit and CO situation.
- Closing happens in 14 to 30 days. Wire pays off any mortgage and the surplus to you. Permit resolution happens post-closing under our management.
We pay all closing costs on our side, you do not bring money to the table. Whether you’ve got one open permit or a multi-decade legalization project, the 10-minute call gets you a clean number to compare against the legalize-or-remove math.