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Service Connections - Essential Considerations for a Functional ADU

Coach houses, also known as carriage houses or granny flats, are becoming increasingly popular as additional dwelling units (ADUs) on residential properties. These self-contained structures offer a variety of benefits, from generating rental income to providing housing for extended family members. However, one crucial aspect of designing and constructing a coach house is ensuring that the service connections are established correctly.


Electricity: Ensuring a reliable electrical connection is fundamental to the functionality and safety of your coach house. Here are some key points to consider:

  • Electrical Panel: The coach house should have its own electrical panel to distribute power to all the appliances, lighting, and outlets within the structure.

  • Compliance: Be sure to adhere to local electrical codes and regulations when wiring your coach house to ensure the safety of occupants.

Water and Plumbing: Access to clean water and proper plumbing is essential for any residential structure, including coach houses. Here's what you need to keep in mind:

  • Separate Water Connection: Just like with electricity, having a separate water meter is beneficial for tracking consumption and billing accurately.

  • Plumbing System: The coach house should have its own plumbing system, which includes connections for sinks, toilets, showers, and any other necessary fixtures.

  • Wastewater: Ensure proper wastewater disposal by connecting the coach house to the local sewage or septic system in compliance with local regulations.

Heating and Cooling: To provide comfort to occupants year-round, consider the heating and cooling systems for your coach house:

  • Heating: Install an energy-efficient heating system such as a furnace, heat pump, or radiant heating to keep the space warm during colder months.

  • Cooling: Depending on your location, you might need air conditioning to maintain a comfortable indoor temperature in the summer.

  • Ventilation: Adequate ventilation is crucial for maintaining good air quality and preventing moisture buildup.

Compliance and Permits: Before making any service connections to your coach house, it's essential to obtain the required permits and comply with local building codes and regulations. This ensures the safety and legal status of your secondary dwelling.


Service connections are the lifeline of any coach house, enabling it to function as a fully independent and self-sustaining living space. By addressing electricity, water and plumbing, heating and cooling, internet and communication, and ensuring compliance with local regulations, you can create a functional and safe environment that will cater to the needs of your coach house's occupants. Properly established service connections are a key factor in making your coach house a valuable and comfortable addition to your property.

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