
In the context of real estate, the term grandfathered refers to a property that is exempt from complying with new regulations because it predates them. This concept, also known as grandfather rights or a grandfather clause, is based on the principle of legal non-conforming use or legal non-complying use. In New York City, for example, the Building Code prohibits apartments smaller than 400 square feet, yet apartments that existed before this regulation was implemented are exempt from it. This means that older, smaller apartments are still considered legal, and their owners are not required to make them larger to comply with the current Building Code. However, it's important to note that grandfather rights are not absolute and may not apply to certain alterations or renovations made to a property.
| Characteristics | Values |
|---|---|
| Definition | Buildings or properties that existed before a code or regulation was written and are therefore exempt from complying with or conforming to the new rule. |
| Applicability | Buildings that were constructed legally under older codes and may be considered "grandfathered" if the use of the building remains the same. |
| Examples | A building with 7 stories in a zoning district that only allows 6 stories; a commercial store in a zoning district that only allows residential use; apartments smaller than 400 square feet in New York City. |
| Limitations | Grandfathered rights are not permanent and may not extend to certain aspects of a property. Changes or renovations to a grandfathered property may negate its status and require compliance with new regulations. |
| Zoning Information | Zoning ordinances outline the applicability of codes on grandfathered properties. In New York City, the Zoning Resolution distinguishes between non-complying buildings and non-conforming uses. |
| Proof of Status | The Department of Buildings may request proof of existing conditions for a property to be considered grandfathered. |
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What You'll Learn

Non-complying buildings
In New York, a non-complying building is any existing building that no longer adheres to one or more of the bulk regulations of the applicable zoning district, typically due to a zoning district change. Non-complying buildings are often referred to as "grandfathered", meaning they are exempt from conforming to new zoning regulations.
For example, a building with 7 stories in a zoning district that only allows 6-story buildings may be permissible if it was built before the current codes. In this case, the building would be considered "grandfathered" and allowed to remain as-is. However, making certain alterations to a "grandfathered" building may negate its status. For instance, if you plan to make changes to the building's bulk, such as increasing its height, setback, or floor area, these changes are regulated to prevent an increase in the degree of non-compliance.
The concept of "grandfathering" allows property owners to retain their rights and continue using their property as they have been without the burden of complying with new regulations. However, it's important to note that "grandfathered" rights are not absolute and typically come with legal limitations. For instance, if a mobile home park has existing structures that are "grandfathered", they may still need upgrades to meet new safety regulations regarding septic tanks.
The determination of whether a building is "grandfathered" can be made by checking the estimated date of construction against the applicable zoning regulations. This information can be found through online tools such as ZoLa, which provides up-to-date zoning and related information for every tax lot within New York City. Additionally, a block or lot may fall under multiple zoning districts, allowing for different uses or building forms.
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Non-conforming uses
In New York, a non-conforming use is a building that has a use that is no longer allowed in a certain zoning district. Non-conforming uses are also known as "grandfathered uses". A nonconforming use is generally defined as a land use or structure that was legal when it was established but does not conform to the standards of the current zoning ordinance.
For example, a commercial store in a zoning district that only allows residential use may be considered a non-conforming use. Similarly, a building with 7 stories in a zoning district that only allows 6-story buildings would be a non-conforming use.
The concept of non-conforming uses is important in the context of property rights and zoning laws. If a property owner has a non-conforming use, they may be exempt from certain current laws or regulations. For instance, if a homeowner's driveway crosses a property line and encroaches onto a neighbour's land, the homeowner may be able to argue that their driveway was proper when it was constructed and thus they have "grandfathered rights".
It is important to note that non-conforming uses are not favoured in zoning laws, as the ultimate goal is to achieve uniformity of property uses within each zoning district. As such, many local zoning ordinances seek to eliminate non-conforming uses through regulations that hinge on continual use.
Additionally, non-conforming uses can be abandoned, at which point their resumption may be prohibited. The definition of abandonment varies depending on the state and local laws, but it generally involves a combination of the intent to abandon and the actual and complete discontinuance of the non-conforming use.
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Legal non-conforming use
In the context of real estate, "legal non-conforming use" is a term used to describe a property that is being used in a way that does not comply with current zoning or land use regulations but is allowed due to its pre-existing status. This concept is also commonly referred to as "grandfathered rights" or "grandfather clauses".
For example, a homeowner's driveway may not conform to current access requirements, but if it was built before the relevant zoning laws were enacted, the municipality may not require the homeowner to repave a new driveway that conforms to the present-day ordinance. Similarly, a commercial store in a zoning district that only allows residential use may be allowed to continue operating as a "legal non-conforming use" if it was legally built under an older code.
It's important to note that grandfathered rights are not absolute and are typically subject to legal limitations. They may not extend to certain aspects of a property, and renovations or changes to the building may negate its grandfathered status. For instance, if a homeowner's bathroom was built before the Americans with Disabilities Act (ADA) was passed, mandating specific accessible dimensions, renovating the bathroom without complying with ADA standards would result in an illegal new bathroom.
Grandfathered rights balance property owners' rights with the need for updated regulations to address evolving public health, safety, and environmental concerns. These rights provide security and assurance to property owners, allowing them to continue using their property without the burden of complying with new, potentially costly regulations. However, local governments are responsible for ensuring that grandfathered properties do not pose significant risks to the surrounding area or the public.
In New York City, the Zoning Resolution outlines two types of grandfathered conditions: non-complying buildings and non-conforming uses. The Department of Buildings has the final say on whether a property qualifies for grandfathered rights, and proof of existing conditions may be requested.
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Property line disputes
In the context of real estate, grandfathered property rights refer to a variety of privileges or exceptions that a property owner has because they owned the property before certain laws or regulations came into effect. These rights allow property owners to continue using their property in a way that was permissible under the zoning or building codes that were in effect when the property was originally developed, even if new laws or regulations no longer permit such use.
For example, a homeowner's driveway may extend past their property line and encroach upon their neighbour's land. In this case, the homeowner may refer to a previous version of the municipal code to determine if the driveway's width was compliant when it was constructed. If the construction did not violate the municipal code at the time, the homeowner may argue that their rights are "grandfathered in". However, this argument is not always effective in the context of a property line dispute. While the homeowner may be exempt from penalties, they may still be liable for violating their neighbour's property rights and may have to pay for their encroachment.
Another example is a commercial store located in a zoning district that only allows residential use. If the store was legally built under an older code, it may be considered grandfathered, and the use may be allowed to continue.
Grandfathered property rights are not a legal term; officials refer to these rights as ""non-conforming" use. These rights typically apply in the context of regulatory code or government statute violations. If provisions in laws allowed for grandfathered rights, a homeowner who violated the law may be exempt from fines and penalties.
In New York City, the Zoning Resolution outlines two types of grandfathered conditions: non-complying buildings and non-conforming uses. Buildings can be grandfathered if they existed before a code was written. However, if alterations are made to a grandfathered building, it may no longer be considered grandfathered. For example, if a commercial building is converted to a residential one, it may need to be brought up to code with the addition of fire sprinklers.
Overall, it is important to note that grandfathered property rights can vary depending on local laws and regulations, and they may change over time as new laws are introduced.
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Building alterations
In New York City, the Zoning Resolution outlines two types of grandfathered conditions: non-complying buildings and non-conforming uses. Non-conforming use refers to a building that has a use no longer permitted in a specific zoning district, but it may be allowed to continue if it was legally built under previous codes. For example, a commercial store in a district that now only allows residential use.
When making alterations to a grandfathered property in New York, the extent and nature of the changes will determine the applicable codes and requirements. Minor alterations that involve less than 30% of the building's value may be able to follow the 1968 Code or prior codes, depending on when the building was constructed. Alterations between 30% and 60% of the building's value would require the altered portions to comply with the 1968 Code. If the alterations exceed 60% of the building's value, the entire structure must comply with the 1968 Code.
Additionally, specific types of alterations, such as fuel gas, plumbing, mechanical work, fire protection systems, elevators, and accessibility improvements, must adhere to the 2014 Codes, regardless of the cost of alterations. Changes involving a switch in occupancy groups may also trigger the requirement to comply with the 1968 Code or, in some cases, the 2014 Codes. Handicap compliance, for instance, is subject to the 2014 New York City Building Code, and renovations must meet these standards.
It is important to note that alterations or renovations that address immediate safety and hazardous conditions, such as updates to the Fire Code, generally apply to all buildings, even those that are grandfathered. Furthermore, work done without permits, even in the past, cannot be grandfathered in, as it was never legal.
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Frequently asked questions
"Grandfathered" is a term used to describe a pre-existing building or use on a property that is exempt from complying with or conforming to a new zoning regulation.
A property qualifies as "grandfathered" if it was built legally and complied with the zoning requirements at the time of its construction. If the zoning laws change after the construction of the building, the property may be exempt from complying with the new rules.
In New York, examples of "grandfathered" properties include buildings that existed before zoning codes were written, such as a building with seven stories in a zoning district that only allows six-story buildings. Another example is a commercial store in a zoning district that only allows residential use.

























