Building an ADU in Louisiana: Your Complete Guide (Bookmark This!)

Accessory Dwelling Units (ADUs) are becoming an increasingly popular housing solution in the US.

Some are building an ADU in Louisiana but the trend has not quite caught on. Be ready, because it is coming!

These versatile units provide a range of benefits but building an ADU involves navigating a complex web of regulations, zoning laws, and financial considerations.

This guide aims to simplify the process by outlining the essential steps and requirements for building an ADU in Louisiana.

Disclosure: This post may contain affiliate links, meaning I can earn commissions. If you decide to purchase through my links, it is at no cost to you.

Why Trust Me to Teach You about Building an ADU in Louisiana?

I have been in real estate since 2017 as a licensed agent and flipped several homes with investors.

I have built solid relationships and spent hundreds of hours researching and learning as much as I can about the real estate industry. I have studied the ADU and Tiny Home market since before I became a Realtor.

This market is my passion and part of the mission I believe God put me on to help others learn and embrace more affordable and alternative housing options.

Part of the ways I am reaching others in this mission is on YouTube.

I am part of a group in our local market working towards building a Tiny Home community for homeless persons. I have visited several tiny house communities and festivals around the U.S.

What are the Rules and Regulations for an ADU in The State of Louisiana?

Louisiana has not seen ADUs grow in popularity like other states in the US so the information and guidance are minimal.

So can you build an ADU in Louisiana? 🤔 Maybe.

The rules and regulations are as clear as Mud – of course, we do eat Mud Bugs so it is fitting. 🦞

Although Tiny Houses have a section in Appendix AQ in the IRC 2021 there is no specific section on ADUs. (Tiny Houses get updated in Appendix BB of International Residential Code without Energy 2024)

The International Residential Code without Energy 2024, includes the section on ADUs in Appendix BC. This is exciting news!

ADUs houing will finally get the clarity and guidance needed to help encourage development. Now we wait for States to adopt the updated version of the code

Here is what the regulation structure looks like for ADUs in Louisiana.

• It starts at the top with the International Residential Code, 2021.
• The State gets involved with the Louisiana State Uniform Construction Code.
• Depending on where you live, you may have to follow the parish rules or the city rules. This would be considered your local jurisdiction.
  • The local jurisdiction is where most of the rules and regulations specific to ADUs are found.
  • You can find your local jurisdiction ADU regulations by contacting the Planning, Zoning, or Code Enforcement department.
• The Neighborhood or HOA could also have its regulations regarding ADUs. The HOA will have to provide this documentation.

ADUs in the IRC, 2021 from the LSUCCC website:

How to use this Guide for your Louisiana ADU Build

This guide will help you navigate an ADU planning and build in Louisiana. I have referenced other articles or videos that go into depth on a topic as needed because there is a lot of information you need to know.

Each part of the ADU build process will be covered as an overview.

This is to familiarize yourself with the steps, vocabulary, and process of adding an ADU to your property.

I will cover the ADU information for each of the major Louisiana cities (or as much as is available) at the end of the article and include a list of helpful websites to help your search.

If your area is not covered, you can always call your Planning, Zoning, or Code Enforcement department for the information.

Section 1: Zoning and Property Regulations for an ADU in Louisiana

Louisiana’s regulations are designed to ensure that ADUs integrate seamlessly into existing neighborhoods while providing additional housing options.

ADU Zoning in Louisiana

In Louisiana, ADUs are generally permitted in residential zones that allow detached single-family dwellings.

However, each zone may have specific stipulations:

• Residential Zones: ADUs are typically allowed in residential zones. You can verify if you are in an eligible area. This information can usually be obtained from your local zoning office.
• Development Standards: ADUs must comply with development standards that reflect the scheme of the surrounding neighborhood to ensure consistency.

Lot Size and Density Regulations

Lot size is a critical factor in determining the feasibility of an ADU:

• Minimum Lot Size: There are minimum lot size requirements to ensure there is enough space for both the primary residence and the ADU. This prevents overcrowding and maintains the character of the neighborhood.
• Density Limits: Typically, only one ADU is allowed per single-family lot. This regulation helps maintain a balance within the community and prevents excessive density​.

Setback and Height Requirements

Setback and height regulations ensure that ADUs do not negatively impact neighboring properties:

• Setbacks: ADUs must maintain specific distances from property boundaries. These setbacks help preserve privacy and light access for both the ADU and neighboring properties.
• Height Limits: There are height restrictions to ensure that ADUs do not overshadow adjacent homes.

Compliance with these regulations is essential for a successful ADU project.

Section 2: Permitting Process

This section outlines the essential stages and requirements to help you get your ADU project off the ground.

Application Submission and Review

Homeowners can submit their applications to the local zoning department. The submission should include:

• Site Plan Preparation: Create detailed site plans that include the layout of the ADU in relation to the primary residence and property boundaries.
• Architectural Drawings: Provide architectural drawings that detail the design and structure of the ADU, ensuring it meets local design standards.
• Ownership Verification: Verify property ownership, as this will be required during the submission​.
• Building Permit Application: This primary permit is necessary for the construction of the ADU.
• Additional Permits: Depending on the project’s specifics, additional permits for electrical, plumbing, and mechanical work may be required.

Review and Approval

The application undergoes a comprehensive review by city planners and relevant departments to ensure compliance with all local regulations. Key aspects of the review process include:

• System Development Charges (SDCs): These fees cover the costs associated with connecting the ADU to municipal services like water, sewer, and transportation infrastructure.
• Compliance Check: The application is reviewed to ensure it meets all zoning, safety, and design standards.

Building Permits and Certificates of Occupancy

Once the application is approved, homeowners can proceed with acquiring building permits. The final steps include:

• Building Permits: Secure the necessary building permits to start construction.
• Certificate of Occupancy: After construction is complete, an inspection is conducted to ensure the ADU complies with all building codes. A certificate of occupancy is then issued, allowing the ADU to be legally inhabited​.

Section 3: Design and Construction Standards

Adhering to specific design and construction standards is important. These standards ensure that the ADU complements the existing neighborhood and meets all safety requirements.

ADU Size Regulations in Louisiana

Louisiana has different guidance on minimum and maximum size dimensions of ADUs. It will depend on your local jurisdiction.

• Minimum Size: The minimum size ensures that the ADU is livable and functional.
• Maximum Size: The ADU must remain secondary to the primary residence. It should not dominate the landscape or overshadow the main dwelling. Typically, the ADU can be no more than a certain percentage of the primary home’s size, or a percentage of the main dwelling’s floor area, whichever is less​. Some states allow up to 1,200.

Architectural Design Consistency

ADUs must be designed to harmonize with the primary residence and the neighborhood:

• Exterior Materials and Colors: The ADU should use similar materials and colors as the primary home. This helps maintain a cohesive look and feel in the neighborhood.
• Roof Pitch and Style: The roof pitch and overall architectural style of the ADU should match or complement the main house to ensure visual continuity​

Parking and Utility Considerations

• Parking Requirements: Homeowners may need to provide at least one additional off-street parking space for the ADU. This requirement ensures minimal impact on neighborhood parking and traffic. (Some other states have modified this requirement)
• Utility Connections: The ADU must have proper connections to municipal services such as water, sewer, and electricity. These connections must meet local utility codes and may require modifications to existing systems to accommodate the new unit​.

Safety and Compliance

Ensuring the ADU meets all safety and building codes.

• Building Codes: The ADU must comply with local building codes, including structural, electrical, plumbing, and mechanical systems.
• Fire Safety: Fire safety measures, such as smoke detectors, fire-resistant materials, and proper egress windows, must be incorporated into the design and construction of the ADU.

Section 4: Owner-Occupancy and Rental Regulations

Understanding the owner-occupancy and rental regulations for ADUs in Louisiana is essential for homeowners who wish to build or rent out these units.

ADU Owner-Occupancy Requirements

In many parts of Louisiana, there are strict owner-occupancy requirements:

• Mandatory Owner-Occupancy: One of the units on the property, either the primary residence or the ADU, must be occupied by the property owner. Some states have modified this requirement.
• Proof of Residence: Homeowners may need to provide proof of residence, such as a driver’s license or utility bills, to demonstrate compliance with this requirement​

Rental Guidelines for ADUS

For those looking to rent out their ADU, several guidelines and restrictions must be followed:

• Maximum Occupancy: There are limits on the number of occupants allowed in an ADU, typically based on the size of the unit. This helps prevent overcrowding and ensures the unit remains comfortable and livable.
• Lease Agreements: Rental agreements must comply with local regulations, which may include specific terms about lease duration, tenant rights, and landlord responsibilities.

Using aN ADU for a Short-Term Rental

The regulations for short-term rentals, such as those listed on Airbnb, can be more stringent.

• Short-Term Rental Permits: Homeowners may need to obtain special permits to use their ADU for short-term rentals. These permits ensure that the ADU meets all safety and zoning requirements.
• Local Restrictions: Some areas may have additional restrictions on short-term rentals to control the impact on the neighborhood, such as limiting the number of rental days per year or requiring the homeowner to be present during the rental period​.

Compliance and Enforcement

• Regular Inspections: Local authorities may conduct inspections to ensure that ADUs comply with occupancy and safety standards.
• Penalties for Non-Compliance: Homeowners who fail to comply with these regulations may face fines or other penalties, including the potential revocation of rental permits

Section 5: Financial Considerations

Building an ADU involves various financial aspects that homeowners need to consider carefully.

Financing Options for Louisiana ADU

Homeowners have several options for financing their ADU projects.

• Cash-Out Refinance: A cash-out refinance will refinance a current mortgage and release some of the equity.
• Home Equity Line of Credit: Using the equity in your existing home can be a straightforward way to finance an ADU. These loans typically have lower interest rates compared to other financing options.
• Construction Loans: These loans are specifically designed for building projects and can cover the costs of materials and labor.
• Grants and Incentives: Some local governments offer grants or financial incentives to encourage the development of ADUs. These can significantly reduce the overall cost of the project​.

Rental Income Potential for ADU in Louisiana

ADUs can provide a steady source of rental income, helping to offset the initial construction costs.

• Long-Term Rentals: Renting the ADU on a long-term basis can provide a reliable income stream. The rental rate will depend on the local market and the size and amenities of the ADU.
• Short-Term Rentals: Platforms like Airbnb can offer higher rental rates, but they may come with more stringent regulations and potential seasonal fluctuations in demand​.

Property Value Impact When Building an ADU in Louisiana

Adding an ADU may increase the overall value of your property.

• Market Appeal: ADUs can make properties more attractive to buyers, particularly in areas with high housing demand.
• Appraisal Considerations: The additional living space and potential rental income can positively impact the property’s appraisal value, but this can vary based on local market conditions and how ADUs are valued in the area​.

Section 6: Cost to build & hiring a contractor

Understanding the cost of building an ADU in Louisiana and hiring the right contractor is so very important for a successful project.

Cost to Build an ADU in Louisiana

Planning and Design Fees

• Architectural Fees: Costs for designing the ADU, typically range from 5-15% of the total construction budget. That could be a huge part of the budget. Be sure to see if you need an architect for your plans or if your area has pre-approved plans you can use.
• Engineering Fees: Expenses for ensuring the ADU is safe and compliant with local codes.

Permitting and Development Fees

• Building Permit Fees: Fees for submitting construction plans, which vary based on the project’s scope and local jurisdiction.
• System Development Charges (SDCs): Fees for connecting the ADU to municipal services like water, sewer, and electricity.

Construction Costs

• Prefab Units: Prefabricated ADUs can be a cost-effective solution but are harder to find. The prices for these could range from $60,000+.
• Garage Conversion: Converting an existing garage into an ADU can range from $30,000 to $80,000.
• Detached ADU: Building a new, detached ADU could be $80,000 – $120,000.

Hiring an ADU Contractor in Louisiana

Selecting the right contractor ensures your ADU project is completed on time, within budget, and to a high standard of quality.

Research and Recommendations

• Referrals: Ask for recommendations from friends, family, and neighbors.
• Online Reviews: Check reviews on platforms like Yelp, Angie’s List, or the Better Business Bureau.

Interview Potential Contractors

• Experience: Ensure the contractor has experience with ADU projects and is familiar with local regulations.
• Portfolio and References: Review previous projects and ask for references from past clients. Visit the project if you can.
• Licensing and Insurance: Verify that the contractor is licensed and insured in Louisiana. THIS IS SO VERY IMPORTANT!!!

Contract Agreement & Quotes

• Written Contract: Ensure all terms are detailed in a written contract, including scope of work, timeline, costs, and payment terms.
• Itemized Estimates: Get detailed, written estimates from multiple contractors to compare costs.

Section 7: ADU Rules in Louisiana by Major City

ADU Regulations in New Orleans

Determining Your Property’s Zoning

To find the zoning designation of a specific property, you can visit property.nola.gov.

Comprehensive Zoning Ordinance

The City’s Comprehensive Zoning Ordinance (CZO) is managed by the Department of Safety and Permits. For the full text of the CZO, visit czo.nola.gov.

More updates to come!

ADU Regulations in Baton Rouge

Coming Soon!

ADU Regulations in Shreveport

Coming Soon!

ADU Regulations in Lafayette

Coming Soon!

ADU Regulations in Lake Charles

Coming Soon!

ADU Regulations in Alexandria

Coming Soon!

More Resources on ADU rules in Louisiana

Use this list to find more information about building an ADU in Louisiana for your area.

If you see an error or would like to suggest a new link, please contact us at ReErin.

Final Thoughts

Building an ADU in Louisiana can offer significant benefits, from providing additional living space for family members to generating rental income.

By adhering to local zoning and building regulations, securing the necessary permits, and planning your finances wisely, you can successfully integrate an ADU into your property.

For detailed and specific information, always refer to your local zoning department or a professional familiar with Louisiana’s ADU regulations to ensure full compliance and to streamline your ADU project from conception to completion.