Non-Conforming and Non-Complying in NYC

When you start any project like renovation, enlargement, legalization, or a change of use project, zoning can be the most complicated part of it. Many owners assume that if a building has existed for years, it’s confirmation to have it the same as before, even after alteration or modification.

There are two zoning terminologies, non-conforming and non-complying, that you need to be aware of before starting any project, especially in New York City. They sound similar, and people sometimes use them loosely, but they refer to two different issues. One usually relates to use. The other usually relates to the physical building condition under zoning.

If you understand the difference early in the process, you can avoid major filing problems, design revisions, and expensive delays with the Department of Buildings.

Why are non-conforming and Non-Complying conditions important in NYC?

The New York City Zoning Resolution controls far more than many people realize. It does not just tell you whether a building can be residential, commercial, or manufacturing. It also regulates things like:

• permitted use
• floor area
• building height
• setback requirements
• rear yards
• lot coverage
• open space
• location of certain occupancies

In a dense city like New York, where many buildings are old and have gone through decades of changes, it is very common to find properties that do not match current zoning rules in a perfect way. That does not automatically mean the building or use is illegal. In many cases, the condition may still be lawful because it existed before the zoning changed or because it was legally established under prior rules.

That is where the concepts of non-conforming and non-complying become important.

What Is a Non-Conforming Use?

A non-conforming use means a use that is not permitted under the current zoning district and resolution, but is still allowed to continue because it was legally in existence before the zoning regulations and Certificate of Occupancy issuance.

In simple words, the use would not be approved as a new use today, but it may still remain because it was there for many years.

This is what is called grandfathered use.

Example:

Imagine a commercial use operating in an area that is now zoned in a way that no longer allows that type of business. If that use was lawfully established before the zoning change, it may continue as a legal non-conforming use.

That does not mean the owner has unlimited rights. It simply means the use may continue under certain conditions because the law recognizes its prior legal existence.

Why Non-Conforming Use Requires Caution

This is where many owners make mistakes.

A non-conforming use may be legal, but it can also be vulnerable. If it is discontinued for too long, changed improperly, enlarged beyond what is allowed, or altered without understanding the zoning consequences, the owner may lose the right to continue that use.

Once that protection is lost, the property may need to comply fully with current zoning rules. And in New York City, that can create a serious problem.

For that reason, any proposed work affecting a non-conforming use should be reviewed carefully before plans are filed. A change that seems minor from a construction point of view may trigger a much larger zoning issue.

What Is a Non-Complying Building?

A non-compliant building is different. Here, the issue is usually not the use, but the building’s physical relationship to current zoning rules.

In other words, the building itself may not comply with today’s zoning requirements for things such as:

• rear yard
• side yard
• height
• setback
• floor area
• open space
• lot coverage

The building may still be legal if it was built lawfully when those conditions were permitted, or if later zoning changes made an already-existing building non-compliant.

So a non-complying building is not necessarily an illegal building. It may simply be a legally existing building that does not match current bulk regulations.

Common Examples of Non-Complying Conditions in NYC

One of the most common examples in New York City is a rear yard deficiency. Many older buildings, especially in established neighborhoods, do not provide the rear yard depth that current zoning would require today.

Another common example is excess floor area. A building may contain more floor area than what is now allowed in the zoning district.

For example, if the zoning allows an FAR of 2.0 and the lot only permits 5,000 square feet of floor area, but the existing building contains 5,500 square feet, then the building is overbuilt by 500 square feet under current zoning. If that condition is legal and existing, the building may remain, but it is considered non-compliant.

You also see non-complying conditions involving height and setbacks, especially in older Manhattan buildings. A structure may exceed current height limits or fail to provide the setback required by the Zoning Resolution. Again, that does not automatically make it illegal, but it does affect what can be done going forward.

Can You Alter a Non-Complying Building?

Generally, yes, you can start an alteration, but there are important factors you need to consider.

In general, you cannot increase the degree of non-compliance.

That means if a building already has a deficient yard, excessive floor area, or a bulk condition that does not comply with current zoning, a proposed alteration typically cannot make that situation worse.

For example, if a building already extends too far into the rear yard, you may not be able to enlarge it further in that same area. If a building is already overbuilt in terms of floor area, adding more floor area may not be allowed without special relief or a different zoning strategy.

This is one of the main reasons a zoning review should happen before design moves too far ahead. A project can look perfectly reasonable on paper and still run into trouble because of an existing non-compliant condition.

The Main Difference Between the Two

A simple way to remember the difference is this:

• Non-conforming usually refers to use
• Non-compliance usually refers to bulk or physical building conditions

So if the problem is that the activity or occupancy does not match current zoning, you are usually talking about non-conforming use.

If the problem is that the building does not meet current dimensional or bulk requirements, you are usually talking about a non-compliant building.

A property can also have both conditions at the same time. For example, a building might contain a use that is no longer permitted in the district while also having a rear yard or floor area condition that does not comply with current zoning.

That is why each property has to be reviewed carefully on its own facts.

Why Documentation Is So Important

In NYC, these issues are rarely resolved by assumption. If you are claiming that a use is legally non-conforming or that a building may remain with a non-complying condition, you usually need proof.

That proof may include:

• Certificates of Occupancy
• old approved plans
• permits and sign-offs
• historical building records
• surveys
• zoning analyses
• tax photos
• other agency or archival records, depending on the case

DOB plan examiners often want to see a clear basis for any existing condition that does not line up with current zoning. If the documentation is weak or incomplete, the filing may run into objections, or the claimed legal status may not be accepted.

Why Owners Should Not Guess

This is one of those areas where guessing can become expensive.

A lot of owners assume that because something has existed for a long time, it must automatically be fine. Others assume that if no one complained before, the condition is safe to keep. But when an alteration application is filed, the existing conditions often come under closer review than they did before.

That is when issues surface.

A property owner may discover that a long-standing use was never documented properly, or that an existing bulk condition affects the ability to enlarge, legalize, or reconfigure the building. By that point, the design may already be done and the budget may already be committed.

A careful zoning review at the beginning can save a great deal of time and money later.

A Practical Way to analyze a building zoning:

If you are background checking an existing building in NYC, there are usually two separate questions that you need to answer first:

• Is the use permitted under current zoning? If not, is there a lawful basis for it to continue as a non-conforming use?
• Does the building itself comply with current zoning bulk regulations and building code?

If not, is there a lawful basis for the existing non-complying condition to remain?

Those two questions should always be analyzed separately. Many filing problems happen because people focus on one and overlook the other.

Finally

Non-conforming and non-complying conditions are not just technical zoning terms. In real projects and zoning analysis, they can affect whether a building can be altered, enlarged, legalized, refinanced, repositioned, or sold with confidence.

Paying attention to these matters can help you make good financial and business decisions and avoid losing money or potential lawsuits.

A non-conforming use generally means the use is no longer permitted under current zoning, but may continue because it was legally established in the past.

A non-complying building generally means the building does not meet one or more current zoning bulk rules, but may remain because the condition is legally existing.

In NYC, where many properties have a complicated history, these issues should never be treated casually and can form the foundation of your design or assessment.

Before filing with DOB or making design decisions, it is wise to review the zoning district, the Certificate of Occupancy, historical approvals, and the physical building conditions with a knowledgeable architect or zoning consultant.

If you need any help, our team at HN REPUBLIC can help you.