How to build a DADU in Nashville?

Nashville's housing market is evolving, with Detached Accessory Dwelling Units (DADUs) becoming an increasingly popular option for homeowners looking to maximize their property's utility. Whether you're considering adding a DADU for extended family, as a rental space, or simply to increase your property's value, understanding the process is crucial. This guide aims to provide you with all the necessary information to bring your DADU project to life in Nashville.

Understanding Legal and Zoning Considerations

Before you start dreaming up plans for your new DADU, it's essential to familiarize yourself with Nashville's zoning laws. Zoning considerations play a pivotal role in determining where a DADU can be constructed. Only specific areas within the city permit the building of ADUs, subject to size, height, and setback requirements. These regulations are in place to maintain neighborhood harmony and ensure privacy.

Recent changes, such as Ordinance No. BL2011-900 has expanded the viability of DADUs in various historic overlays and zones in Nashville. For the most current and detailed information, consulting with Nashville's municipal resources is recommended.

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Planning Your DADU

When planning your DADU, several factors come into play. The planning process involves decisions on size, layout, and utilities. Sustainability should be a key consideration, aiming for an energy-efficient structure that utilizes "green" materials. Additionally, the impact of your project on storm water runoff and the health implications of your building's design should be considered.

Key Considerations Include:

• Sustainability: opt for energy-efficient utilities and materials.
• Drainage: Design your building to minimize storm water runoff.
• Health: Ensure good ventilation and access to natural light.

Budgeting and Financing

Estimating the costs and exploring financing options are critical steps in the DADU building process. Construction costs in Nashville have seen significant increases, making a realistic budget more important than ever. Researching all aspects of zoning requirements can help avoid unnecessary expenses. Schedule a free call with an ADU expert

Navigating Construction and Building Codes

The construction process requires adherence to inspection requirements and building codes. Depending on your lot's size and the intended use of the DADU, there are specific rules related to the allowable footprint and height of the structure.

Here are some accessibility recommendations for building a DADU (detached accessory dwelling unit) in Nashville:

Interior Lot Without Alley

One of the first steps in determining where an accessory dwelling unit can be placed is analyzing your lot size and context. For interior lots without alley access, there are specific guidelines:

- The DADU must be set back a minimum of 5 feet from the rear property line.

- Side setbacks require a minimum of 5 feet from the side property lines.

- One-story DADUs must be at least 10 feet away from the principal structure.

- Two-story DADUs need a minimum 20-foot separation from the main home.

Since there is no alley access, the DADU will need to be oriented and designed for pedestrian access from the front street. Careful planning is needed to avoid obstructing access to the primary residence.

Interior Lot With Alley

Lots with rear alley access have some different considerations:

- The primary home must maintain alley access, so the DADU cannot impede this.

- Rear setback is minimum 5 feet from property line, or 18 feet if including parking for the DADU.

- Side setbacks are 5 feet minimum.

- One-story DADUs need 10 feet separation from the main house.

- Two-story DADUs require a 20-foot separation.

- Vehicle access to the DADU should utilize the alley per code requirements.

No matter the lot configuration, attentive site planning and adherence to setbacks and access rules is crucial for a code-compliant DADU in Nashville. Consulting experienced professionals is highly recommended.

Important Rules to Keep in Mind:

• For lots under 10,000 sqft: The largest footprint for any single outbuilding is 750 sqft.
• For lots over 10,000 sqft: The largest allowable footprint is 1000 sqft.
• Height Restrictions: The maximum allowable height for any outbuilding is 25.

Here are the key steps for beginning the process of building a DADU in Nashville:

1. Determine the primary intended use and zoning requirements.

The first step is researching the zoning regulations for your property to understand what type of accessory dwelling is allowed in terms of use (living quarters, home office, etc.) and size limitations. Check if your property is in a historic overlay district with additional guidelines.

2. Decide on design approach.

You'll need to determine if you want to hire an architect/designer experienced with DADUs, use a stock plan, or design it yourself. Professional design help can ensure compliance with zoning and navigate any complexities.

3. Establish a realistic budget.

Set a maximum budget amount that accounts for the current high costs of construction in the booming Nashville market. Costs have increased 25-50% or more since 2015.

4. Define your needs and uses.

Clearly define how you intend to use the DADU - parking, storage, living space, home office, etc. The allowed uses per zoning can dictate maximum size.

5. Review restrictive covenant requirements.

Nashville often requires a restrictive covenant be signed for DADUs, limiting the use to residential accessory purposes and prohibiting uses like short-term rentals or commercial activities.

Starting with zoning research, setting a budget, and determining your functional needs upfront will allow you to properly scope your DADU project before getting too far into design and construction planning. Consulting experienced professionals is highly recommended.

Working with Professionals

Bringing your DADU to life often necessitates working with architects, contractors, and other professionals. These experts can guide you through the zoning research, design, and construction phases, ensuring your project complies with all regulations. Schedule a free call with an ADU expert

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Taking the Next Steps

Building a DADU in Nashville is a complex but rewarding endeavor. By understanding legal and zoning considerations, planning meticulously, budgeting realistically, and navigating construction and building codes, you can make informed decisions throughout the process. Working with professionals and learning from others' experiences can further ensure the success of your project.

For those considering adding a DADU to their property, now is an exciting time to explore the possibilities. With careful planning and execution, your DADU can provide additional living space, income potential, and increased property value, all while enhancing the fabric of your neighborhood.

Remember, the first step in any successful DADU project is thorough research and planning. By understanding the specific requirements and regulations of Nashville, consulting with experts, and planning your project with care, you can create a space that meets your needs and contributes positively to the community.

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