In in-law suite is the most common name for a small dwelling on the same property as (and perhaps attached to) a single-family home, where an aging family member (or others) can live with some modicum of privacy and independence. It’s often a separate space with its own bathroom.
They’re a desirable feature in a home that comes in handy in many ways well beyond providing a place for mom alone. Here’s everything homeowners need to know.
What to know about an in-law suite
The traditional in-law suite can be either connected to the main dwelling of the home (perhaps as an addition), or an external, separate structure, like a small cottage on the property or a converted garage. Minimally, an in-law suite has a bedroom and full bathroom. It can also come with additional rooms, such as a sitting room or a small kitchen.
Alternate uses for separate suites
When not in use by an aging parent, an in-law suite can serve many purposes, making it a wise investment. Here are some uses to consider:
- Home office: More and more buyers are looking for a place to work from home. So this area could be the perfect spot for your small business.
- Guest quarters: When out-of-town guests come to visit, an in-law suite is the perfect place to give them a little privacy, with their own bedroom and bathroom.
- Residence for an older child: Adult children who may need to live at home while establishing themselves financially can use the space as an apartment, perhaps even paying a little rent.
- Short- or long-term rental apartment: Since many in-law suites are fully equipped apartments, they make ideal rental apartments, which can bring in added income from long-term renters or short-term rentals.
What’s the cost of an in-law apartment?
The cost to add this amenity to your home varies widely, depending on the size, details, and whether it will be an addition to an existing home or a stand-alone structure. When adding an in-law suite to an existing home, expect to spend an average of $30,000 to $70,000. If you’re building a new structure, it can cost as much as $125,000 (or more!).
In-law apartments as a sales feature
Thanks to their versatility, in-law suites are an attractive feature to look for when buying a home—or to play up in your home if you’re selling.
A mother-in-law space, or even the potential for one, can make your home more desirable to buyers. At the Shore, space is always at a premium, so in-law suites offer the space many families need. With rentals always in hot demand, they are an easy way to reduce expenses and generate income.
Are in-law suites legal?
Local ordinances vary when it comes to the amenities of an in-law suite and its use. To find the laws specific to your property, go to the zoning office with your lot and block number, to find out if having such a suite on your property is permitted.
If zoning laws do not allow an in-law apartment, it may be possible to get a variance.
You will also need to obtain building permits. Even then, there may still be limitations on what the suite can include or how it may be used. Some zoning laws do not allow full kitchens, because of the risk of stove fires. Some laws do not allow such suites to be rented out if they are no longer being used for an older relative.
Homeowners find the pros outweigh the cons, and that in-law suites are a smart investment both while they are living in the home and when they go to sell.

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