What is ADU?
An accessory dwelling unit (ADU) is a second dwelling unit that is subordinate to the owner-occupied main one-family dwelling located on the lot with house. ADUs go by many names, such as accessory apartments, granny pods, backyard cottages or carriage houses, among others. ADU is smaller than the house and it must contain permanent provisions for living, sleeping, eating, cooking and sanitation. ADUs can be created by altering a portion of a main existing house, including a garage, adding to an existing house, or constructing a new detached building on the same lot.
ADUs have gained popularity as a solution for housing shortages, offering affordable living spaces for renters, multigenerational families, or homeowners looking for additional income. By utilizing existing property space, ADUs maximize land use while adhering to local zoning laws and building codes.
If you are considering building an ADU here are some factors to learn about.
ADUs have gained popularity as a solution for housing shortages, offering affordable living spaces for renters, multigenerational families, or homeowners looking for additional income. By utilizing existing property space, ADUs maximize land use while adhering to local zoning laws and building codes.
If you are considering building an ADU here are some factors to learn about.
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Types of ADUs:
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Why are ADUs so Popular Now?
Accessory Dwelling Units (ADUs) are becoming increasingly popular for their flexibility and modern appeal. These compact living spaces are perfect for generating rental income, housing loved ones, or creating a private home office. ADUs make the most of your property, offering a stylish and affordable housing option without sacrificing neighborhood charm. Whether you're looking for extra income, space for family, or a personalized retreat, ADUs are the smart solution for today's evolving lifestyle needs.
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Perfect for families of all ages, ADUs offer a blend of privacy and comfort that suits a variety of life stages. Whether it’s a young family starting out or older relatives needing a nearby space, these units create flexible living arrangements that foster connection while respecting independence. With smart layouts and modern features, they provide a cozy retreat tailored to meet the unique needs of multigenerational living or families seeking extra space.
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What Should I know before Building an ADU?
Before starting your ADU project, it’s essential to understand the process to ensure a smooth experience. Begin by applying for a license with the Department of Housing and Community Affairs (DHCA), where you’ll receive approved stamped drawings and an inspection report—key documents for your building permit application with the Department of Permitting Services (DPS). Once your ADU passes the final DPS inspection, DHCA will conduct a final review and issue your ADU license. For homes on septic or well lots, coordinating with your local Well and Septic Department ensures compliance with specific requirements.
The Application Process:
Converting an existing unfinished space to an ADU, requires special consideration because some features, such as ceiling heights, windows, stairs, sprinkler heads, and exits may not meet current building code requirements for finished space. Additionally, all zoning ordinance requirements must be met. These conditions could make it impossible for you to change your unfinished space into living space.
Regulatory Requirements for Creating an ADU:
- Zoning:
The zoning ordinance limits the location of entrance doors and size of the ADU. Please see all the other requirements such as setback, size, height and so on.
- Construction:
A building permit is required to build an ADU. Depending on the scope of work, your project will most likely also require electrical, fire protection (sprinklers), mechanical, right-of-way, drainage permits issued by DPS.
- Fire Protection:
If you are planning to add a sprinkler system, DPS will issue a fire protection permit. What modifications are required to accommodate the sprinkler installations, such as correct water pipe size and meter.
- Water and Gas:
Same thing for fire protection if you are planning to add water and gas pipeline system, you have to follow the water modifications.
- Drainage:
For properties under 15,000 square feet without an approved stormwater management plan, new construction or additions require a drainage plan. This plan must detail measures to control and safely manage runoff caused by the project.
- Land Development:
A sediment control permit is required for land disturbances of 5,000 square feet or more or projects involving 100 cubic yards of earth movement. For ADUs on septic systems, a new septic reserve area must be established, requiring soils testing (water table and percolation tests) and a new septic system permit. If successful, a final plan must be submitted for approval, after which the septic permit is issued, making the building permit eligible for approval. In some cases, a separate well may also be required.
- Covenants and Deed Restrictions:
Many of the subdivisions and developments in other counties have private deed restrictions and covenants regulating the construction of decks beyond the limitations contained in County Ordinances. These amount to contractual agreements and thus the County does not enforce covenants and deed restrictions.
For more information click here.
The Application Process:
Converting an existing unfinished space to an ADU, requires special consideration because some features, such as ceiling heights, windows, stairs, sprinkler heads, and exits may not meet current building code requirements for finished space. Additionally, all zoning ordinance requirements must be met. These conditions could make it impossible for you to change your unfinished space into living space.
Regulatory Requirements for Creating an ADU:
- Zoning:
The zoning ordinance limits the location of entrance doors and size of the ADU. Please see all the other requirements such as setback, size, height and so on.
- Construction:
A building permit is required to build an ADU. Depending on the scope of work, your project will most likely also require electrical, fire protection (sprinklers), mechanical, right-of-way, drainage permits issued by DPS.
- Fire Protection:
If you are planning to add a sprinkler system, DPS will issue a fire protection permit. What modifications are required to accommodate the sprinkler installations, such as correct water pipe size and meter.
- Water and Gas:
Same thing for fire protection if you are planning to add water and gas pipeline system, you have to follow the water modifications.
- Drainage:
For properties under 15,000 square feet without an approved stormwater management plan, new construction or additions require a drainage plan. This plan must detail measures to control and safely manage runoff caused by the project.
- Land Development:
A sediment control permit is required for land disturbances of 5,000 square feet or more or projects involving 100 cubic yards of earth movement. For ADUs on septic systems, a new septic reserve area must be established, requiring soils testing (water table and percolation tests) and a new septic system permit. If successful, a final plan must be submitted for approval, after which the septic permit is issued, making the building permit eligible for approval. In some cases, a separate well may also be required.
- Covenants and Deed Restrictions:
Many of the subdivisions and developments in other counties have private deed restrictions and covenants regulating the construction of decks beyond the limitations contained in County Ordinances. These amount to contractual agreements and thus the County does not enforce covenants and deed restrictions.
For more information click here.
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How much will an ADU Cost around?
The cost of building an Accessory Dwelling Unit (ADU) can vary widely based on factors such as location, size, materials, and design. Here are some general estimates:
Some of the types of ADUs can cost around:
1. Detached ADU (Standalone Unit)
For a more accurate estimate, consult a local contractor familiar with ADU projects and local building regulations.
Some of the types of ADUs can cost around:
1. Detached ADU (Standalone Unit)
- Cost: $150,000 - $300,000 or more
- This includes construction of a new structure with its own utilities and foundation.
- Cost: $100,000 - $200,000
- Lower cost compared to detached ADUs as they share part of the main structure.
- Cost: $50,000 - $125,000
- A more affordable option since the structure already exists.
- Cost: $75,000 - $150,000
- Costs depend on required modifications like waterproofing and meeting building codes.
- Permits and Fees: $5,000 - $20,000
- Utilities: Extending water, electricity, and sewer lines can add $10,000–$50,000.
- Finishes and Features: High-end materials or custom designs will increase costs.
For a more accurate estimate, consult a local contractor familiar with ADU projects and local building regulations.
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