Are you thinking about building a basement apartment in your Salt Lake City home? Whether you want to generate rental income, create a comfortable space for aging parents, or make better use of an unfinished basement, a well-designed apartment can add flexibility and long-term value to your house. If you're still exploring your options, our basement remodeling page explains what's involved in transforming an unfinished basement into a finished living space.
The key is doing it the right way. Building a basement apartment involves more than adding walls and finishes. At RemodelCo, we help homeowners understand local requirements, plan a layout that supports their goals, and move through the design, permitting, and construction process with greater clarity.
This guide explains what qualifies as a basement apartment, how permitting and code requirements may affect your project, what influences the cost, and how to plan the space for long-term rentals, multigenerational living, or short-term rentals.
A basement apartment is a self-contained living space within your home that typically includes a bedroom, bathroom, kitchen or kitchenette, living area, and a separate entrance.
You might also hear terms such as an internal ADU (Accessory Dwelling Unit), an in-law suite, a mother-in-law apartment, or a granny flat. While these terms are closely related, they don't always mean the same thing from a zoning or permitting standpoint.
For most homeowners in Salt Lake City, Sandy, Draper, Millcreek, Holladay, and nearby communities, the goal isn't simply to finish a basement. It's to create an independent living space that serves a specific purpose today while remaining flexible for the future.
Common reasons homeowners build basement apartments include:
No matter how you plan to use the space, thoughtful planning early in the process can help you avoid expensive changes later.
Whether you can build a basement apartment depends on your property's location, zoning, and local regulations.
One of the biggest misconceptions homeowners have is assuming the same rules apply throughout the Salt Lake Valley. They don't. Salt Lake City, Salt Lake County, and neighboring cities each have their own ordinances governing accessory dwelling units (ADUs), basement apartments, and rental properties.
Before investing in plans or construction, you'll want to confirm requirements for your specific address.
Depending on your municipality, regulations may address:
If your goal is generating rental income, confirming these requirements upfront can save significant time and money.
An experienced remodeling contractor can often help you understand what questions to ask, but you'll also want to verify current regulations with your local building department before moving forward.
Building a legal basement apartment requires permits, and the finished space must comply with current building and safety codes before anyone occupies it.
While every property is unique, most basement apartment projects involve more than cosmetic remodeling. Safety, structural integrity, fire protection, and habitability all become part of the planning process.
Every basement bedroom must have a code-compliant emergency escape and rescue opening, often called an egress window.
That often means installing properly sized egress windows that meet local code requirements. In addition to meeting building codes, these windows provide critical emergency exits and allow more natural light into basement living spaces.
Safety requirements commonly include:
These requirements help protect everyone living in both the main home and the basement apartment.
Adding a kitchen or full bathroom usually requires new plumbing, electrical work, and mechanical upgrades.
Depending on your home's existing systems, your contractor may also recommend improvements to water supply, drainage, ventilation, or electrical capacity.
Some homeowners are tempted to skip permits in hopes of saving money or speeding up construction.
Unfortunately, that decision can create much bigger problems later.
An unpermitted basement apartment can affect:
Taking the time to complete the project properly provides peace of mind and helps protect your investment.
At RemodelCo, planning begins long before construction starts. During your consultation, the team takes time to understand your goals, evaluate your existing basement, and discuss the factors that may influence design, permitting, and construction before providing detailed planning numbers. You can also learn more about the company's approach on the Process page and explore previous projects in the Portfolio to see how thoughtfully planned remodels come together.
A well-designed basement apartment should support the way you plan to use it today while remaining flexible for the future.
One of the first questions to answer is, "Who will be living here?" The answer will influence everything from the layout and finishes to the type of kitchen, storage, accessibility features, and level of privacy you want to create.
A basement apartment designed for long-term tenants should balance comfort, privacy, and durability.
If your goal is to rent out the space, think beyond simply meeting code requirements. Features that make everyday living easier can also make your apartment more attractive to quality tenants.
Consider including:
Planning these details from the beginning can also help reduce future maintenance and improve the overall rental experience.
A basement apartment can also be an excellent solution for aging parents, adult children, or extended family members.
The goal is often to create independence without sacrificing connection. Family members have their own private living space while remaining close enough to provide support when needed.
Depending on your family's needs, you might consider:
Even if your current plans don't involve aging parents, designing with accessibility in mind can make the space more functional for years to come.
Some homeowners wonder whether they can use a basement apartment as an Airbnb or other short-term rental.
While this may be possible in some situations, it's important to understand that short-term rental regulations are separate from building codes and can change over time.
Salt Lake City currently limits short-term rentals to certain zoning districts and requires eligible properties to obtain a business license. The city also limits the number of rental nights each year and imposes additional operational requirements.
Because these rules continue to evolve, it's best to review the City's current short-term rental requirements before designing your project around Airbnb income.
For many homeowners, designing a basement apartment that can function as a comfortable long-term rental or multigenerational living space offers greater flexibility if regulations change in the future.
The cost to build a basement apartment depends on your home's existing conditions, the apartment's size, and the features you choose to include.
Unlike a standard basement finishing project, an apartment often requires additional work to create a fully independent living space. A kitchen, separate entrance, bathroom, utility upgrades, and sound insulation can all influence the final investment.
Some of the biggest cost factors include:
Every project is different, which is why RemodelCo begins with a detailed on-site consultation instead of relying on rough online estimates. For many standard remodeling projects, our team provides Good, Better, Best planning ranges during the consultation to help you understand your options and make informed decisions before moving into the design phase. The final fixed-price proposal comes later, after the scope, measurements, material selections, and plans have been finalized.
If you're in the early planning stages, downloading our Cost Guide is a great way to understand the factors that influence pricing and begin setting a realistic budget for your project.
Building a basement apartment is much easier when you understand each step before construction begins.
While every project is unique, following a structured process helps minimize surprises and keeps everyone aligned.
You'll start with a conversation about your goals, budget, timeline, and how you plan to use the apartment. This helps determine whether the project is a good fit and identifies any early considerations.
Next, your contractor visits your home to evaluate the basement, take measurements, and discuss layout ideas. RemodelCo provides detailed Good, Better, Best planning ranges for many standard remodeling projects to help you compare different investment levels early in the process.
If design assistance is needed, you'll work through floor plans, fixture selections, cabinetry, flooring, countertops, lighting, and other finish details before construction begins.
Once the design and scope are finalized, you'll receive a fixed-price proposal. After approval, permits are obtained as required, and the project is scheduled.
During construction, your contractor coordinates trades, manages the schedule, and keeps you informed throughout the project while working toward a finished apartment that feels like a natural extension of your home.
By investing time in planning before construction begins, you're far more likely to enjoy a smoother project and a finished space that meets your goals.
Not every basement is ready to become an apartment, but many unfinished basements already have the foundation for a successful conversion.
If several of the following describe your home, your basement may be a strong candidate for an apartment project:
Even if your basement doesn't check every box today, many challenges can be addressed through thoughtful planning and design. An experienced contractor can evaluate your space, identify potential obstacles, and recommend practical solutions before construction begins.
It can be, provided your property meets local zoning requirements and the apartment complies with applicable building codes and permitting requirements. Because regulations differ between Salt Lake City, Salt Lake County, and neighboring municipalities, it's important to verify the rules that apply to your specific property before beginning your project.
Yes, most basement apartment conversions require permits. Depending on your project, permits may cover structural work, plumbing, electrical, mechanical systems, and other improvements needed to meet current building codes.
The investment varies depending on your basement's size, layout, existing conditions, and the features you want to include. Adding a kitchen, bathroom, separate entrance, or utility upgrades can all affect the final cost. A consultation and detailed planning estimate will provide a much more accurate picture than an online cost calculator.
Most basement apartments must meet building code requirements related to emergency egress, smoke and carbon monoxide detectors, ceiling height, ventilation, electrical systems, and fire safety. The exact requirements depend on your home's location and the scope of your project.
Owner-occupancy requirements vary by municipality and the type of dwelling unit you're creating. Always confirm current regulations with your local jurisdiction before planning a rental apartment.
Possibly, but separate short-term rental regulations apply. Salt Lake City currently limits where short-term rentals are allowed and requires eligible properties to meet licensing and operational requirements. Because these rules may change, it's a good idea to review the City's latest requirements before planning your project around short-term rental income.
Building a basement apartment requires careful planning, clear communication, and an organized process that keeps your project moving forward.
At RemodelCo, every project begins by understanding how you want to use the space. Rather than jumping straight to pricing, the team asks detailed questions about your goals, budget, timeline, and future plans so recommendations are tailored to your needs. That's one of the reasons many homeowners appreciate our approach. The focus isn't just on finishing a basement. It's on creating a space that works for your family and your long-term goals.
Throughout the project, our team coordinates all the moving pieces involved in your basement apartment conversion, including:
Whether you're planning a rental apartment, an in-law suite, or a flexible living space for the future, having this structured process makes the experience far less stressful.
If you'd like to see our work, browse our portfolio to see completed basement transformations throughout the Salt Lake City area.
Building a basement apartment is one of the most versatile ways to make better use of your home. Whether your goal is to earn rental income, create space for family, or add flexibility for the future, thoughtful planning is the key to a successful project.
At RemodelCo, we help homeowners throughout the Salt Lake City area navigate every stage of the process, from the initial consultation and planning through permitting, construction, and project completion. If you're ready to explore your options, contact us to schedule a consultation.