Are ADUs Legal in Philadelphia? Your Guide to Secondary Units

Yes, accessory dwelling units, commonly referred to as ADUs, are legal in Philadelphia provided they meet certain requirements as per the Philadelphia Zoning Code. Here are some key factors to consider if you’re interested in building an ADU in Philadelphia:

ADUs are only allowed on properties that are occupied by a single-family occupancy in a semi-detached or detached structure.

The permitted zones where ADUs are allowed are described in SS 14-604(11)(d) of the Philadelphia Zoning Code.

ADUs are not permitted in historical structures as defined under section (d).

ADUs must meet all applicable requirements of the Philadelphia Building Code and Philadelphia Zoning Code.

Prior to building an ADU, it’s recommended to consult with a licensed architect and zoning attorney to ensure compliance with the regulations.

As with any construction project, it’s important to do your due diligence and make sure you’re following all the rules and regulations. With the right guidance and support, building an ADU in Philadelphia can be a great way to add value to your property and create additional living space.

Understanding Accessory Dwelling Units (ADUs)

An Accessory Dwelling Unit (ADU) is a secondary dwelling unit that can be added to an existing property or can be attached to the main house. These units are also known as granny flats, in-law units, or secondary suites. ADUs serve as an excellent way of adding additional living space while utilizing the existing space and providing affordable housing options for residents of Philadelphia. ADUs are gaining momentum in Philadelphia as the city is working towards increasing the availability of affordable homes for its residents.

Permitted Zones for ADUs in Philadelphia

In Philadelphia, ADUs are legal and can be found only on properties occupied by a single-family occupancy in a semi-detached or detached structure within the permitted zones described by SS 14-604(11)(d) (Permitted Zones). These zones include:

• RSA-1
• RSA-2
• RSA-3
• RSA-4
• RSA-5
• RM-1
• RM-2
• RMX-1
• RMX-2
• CMX-1
• CMX-2
• CMX-2.5
• CMX-3
• CMX-4
• IRMX

Single-Family Occupancy & ADUs: What You Need to Know

ADUs in Philadelphia are allowed only on properties occupied by a single-family occupancy in a semi-detached or detached structure. The property owner is responsible for ensuring that the ADU meets the zoning and building code requirements. The property owner is also required to meet all the regulatory requirements, including obtaining permits for the construction of the ADU and ensuring that the necessary inspections are conducted to ensure that the ADU meets all the applicable codes.

Regulations & Restrictions for ADUs in Philadelphia

In Philadelphia, ADUs are subject to several regulatory requirements, including building codes, zoning regulations, and licensing requirements. The property owner is responsible for ensuring that the ADU meets the building codes and zoning regulations of the city. For example, the ADU must meet the minimum square footage requirements, be connected to the city’s water supply and sewage system, and meet the required health and safety standards. Additionally, there are certain restrictions that apply to ADUs. For instance, they cannot be used as short-term rentals, such as Airbnb or other vacation rental services. The property owner must also provide adequate parking space for the ADU occupants.

Historical Structures: Why ADUs are Not Permitted

ADUs are not allowed in historical structures or buildings as defined under section (d). Historical buildings or structures are defined as those that are included in the historic register or are listed as historic structures by the city. The reason for this is to preserve the historical character and integrity of these buildings.

Process for Applying for an ADU in Philadelphia

To apply for an ADU in Philadelphia, the property owner must first consult with a licensed architect or contractor to determine the feasibility of constructing an ADU. Once the feasibility is established, the owner must apply for the necessary permits from the Department of Licenses and Inspections. The application must include a detailed plan and design of the ADU, including a floor plan, building materials, plumbing and electrical systems, among other details. Once the permits are approved, the property owner can then begin the construction process. It is important to note that the construction of an ADU must meet all the required codes and regulations, which includes obtaining the necessary inspections to ensure that the ADU meets all the safety and health requirements. In conclusion, ADUs are legal and can provide a viable option for increasing affordable housing and adding additional living space in Philadelphia. However, it is important to adhere to all the regulatory requirements and obtain the necessary permits and inspections for the construction of the ADU. By doing so, the property owner can ensure that the ADU meets all the safety and health requirements and is a valuable addition to the property.