Building an in-law suite is a wonderful way to upgrade your home
Building an in-law suite in your home or as a freestanding structure gives you flexible space for family members, rental income, or guest accommodations.
Expect to pay $44,000 for an additional bedroom and bathroom or over $100,000 for a fully detached in-law suite, depending on your project scope.
Start planning your in-law suite early to allow time for local building code research, permit approval, and construction delays before you need the space.
Hiring a local home addition professional keeps your in-law suite project on track with proper accessibility features and aging-in-place modifications for comfortable, safe living.
In-law suites are often built for relatives or people who are older, but plenty of homeowners use them as rental units, guest houses, and more. If you are planning an in-law suite addition or upgrade, there are many elements to consider before you begin. Follow these tips to design an in-law suite that your family will enjoy, adds value to your home, and enhances your lifestyle.
If you are building an independent or freestanding structure, there are many factors to consider before starting construction work. The same goes if you are paying for the cost to remodel a basement or turning a floor of your home into an in-law suite, although the construction costs for the latter will most likely be lower than for a completely new build.
You’ll need to check out local building codes and regulations after determining whether to build a new structure on your property or utilize an existing space as a separate unit. You may also want to ensure that the in-law suite’s utilities are separate from the main house, which is particularly essential if you plan to rent the unit out in the future.
It’s always a good idea to assume renovations will take longer than the original timeline, and this is also true when building an in-law suite or addition. If you plan on having your older family members live with you eventually, start planning as soon as possible. You’ll want the in-law suite ready to go before you need it and while your parents or in-laws still live independently. You can always rent out the unit if you complete it early.
Not all accessory dwelling units (ADUs) are used as in-law suites for older relatives. However, if you’re building this home addition for folks who have accessibility needs, finding a local home addition contractor who understands your requirements is critical before breaking ground.
For instance, consider any disabilities of your future residents. Do you need a walk-in tub, lowered counters for wheelchair users, or other unique features? Does the space need to be wheelchair accessible? This means you’ll need wider doorways and hallways, grab bars in the bathroom, lower countertops and cabinets, and more room to maneuver in general.
Before you sign off on architectural or building plans for an in-law suite or addition, consider these needs. According to the National Association of Home Builders, work with a contractor or architect who is a Certified Aging in Place specialist and knows how to make the appropriate safety modifications for older adults or people with disabilities. This will help to ensure that your parents or in-laws can live comfortably and happily in their new home.
Aging in place is becoming increasingly common, so if your parents, in-laws, or other family members are unable to live alone but are still somewhat independent, an in-law suite in your house or on your property can be a good choice. Moreover, adding a complete in-law suite with its own kitchen or kitchenette and full bath can increase your property value. You can even rent out the in-law suite in the future if you wish.
An in-law suite can be a great option for older parents, adult children, family members with disabilities, or friends in transition. You can also rent out the in-law unit for some extra income, which would mean it’s not a guest house where you’d supply utilities.
Suppose you plan on renting out the suite or otherwise separating it from your household budget. In that case, you’ll want to ensure it has its own meters and utilities set up so you can bill or track associated costs appropriately.
Approximately 500 to 700 square feet is a good size for an in-law apartment or addition. Think of a studio apartment and plan accordingly–at the very least, you’ll need room for a bed, some living space, a bathroom, and a kitchenette with a small dining area.
If your in-laws or parents are living with you, they likely will be using the main house as well, so they will have some additional room and storage space there.
Privacy is also an important consideration for your in-law addition. While your parents or in-laws may not live totally independently, they still need personal space. Building a freestanding structure on your property or putting the in-law suite on a separate floor or opposite side of the house can be an excellent way to balance privacy and family time.
The price of an in-law suite varies greatly depending on whether you upgrade or enhance an existing area of your home or add an entirely new room or freestanding building.
That said, building an in-law suite costs around $44,000 for an additional bedroom and bathroom but can increase to over $100,000 for a fully detached structure or an apartment over a garage.
When you are adding on to your home, you’ll likely need a team of professionals, including an architect, roofers, electricians, plumbers, and more, along with general contractors and labor.
Adding an in-law suite can make your home more appealing and add value to your property. After all, even if potential buyers don’t have parents or in-laws to move into their home, an additional unit can benefit a family member with disabilities, an adult or older child who wants their own space, or a friend who needs a transitional living situation. An in-law unit can also be an excellent source of rental income.
There is some demand in the market for ADU's, specifically in-law suites. Most of this is driven by new homebuyers looking for ways to help pay their mortgage by renting space without having to qualify for an additional loan to purchase a separate investment property. This has increased as mortgage rates have continued to increase and homebuyers look for ways to save.
Even if you are super handy or skilled at DIY projects, building an in-law suite is complex and is not really a task for a weekend warrior. This is because there are many complicated factors involved, such as wiring for electricity, installing plumbing in the kitchen and bathroom, taking care of climate-control utilities like heating and air conditioning, and laying the groundwork for another residential unit.
That said, once the foundation of the in-law suite is in place, you could likely handle things like painting or finishing the flooring to save on costs. If you are remodeling an existing unfinished space into an in-law suite, you may also be able to tackle parts or all of the project yourself, depending on your DIY skills and inclinations.
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