In-law suites, explained
What is an in-law suite?
An in-law suite is a private place for a parent or another family member to live, in your house or close to it.
It’s usually a bedroom, a bath and room to sit, set apart from the rest of the home.
Or call or text (817) 631-9803
A guest room in a garage we turned into a guest house in Mistletoe Heights.
The term
In-law suite meaning: their own space, in or close to your home
An in-law suite, or mother-in-law suite, is living space for family that sits apart from the rest of the house. The dictionary puts it in four words: in or close to.
The dictionary
in-law suite
noun · US
a separate living space in or close to a larger home where an elderly (= older) parent or elderly parents can live
“My mother-in-law just moved out of the in-law suite in the basement.”
The name tells you who it’s for, not how it’s built. One family’s in-law suite is a bedroom and bath at the end of the hall. Another’s is a small building behind the house. And the room doesn’t care whose in-law moves in: a grown kid home for a year or a sibling between houses uses it the same way.
The two kinds
Attached vs detached in-law suite
There are two kinds, and the difference is where the suite sits. An attached suite is part of the house. A detached suite is its own building on the same lot.
Two ways to give family their own space
Attached
- Where it sits
- Inside the house, or built onto it
- How we build it
- As an addition, the same way we add a primary suite
- Other names you’ll hear
- In-law suite addition, mother-in-law suite addition, attached in-law suite, multigenerational addition
- Where to start
- Home additions
Detached
- Where it sits
- Its own building on the same lot, usually behind the house
- How we build it
- As a small new building, or a garage turned into living space
- Other names you’ll hear
- Detached in-law suite, mother-in-law cottage, granny flat, casita, garage apartment
- Where to start
- Garage apartments and casitas
Which one fits depends on the house, the lot and how close everyone wants to be. We’ll walk it with you and talk through both.
Two we built
Attached and detached: one of each we built
An attached in-law suite is built like an addition. A detached one is built like a guest house. Here’s one of each we built, both in Mistletoe Heights.
Built onto the house
A primary suite addition we drew and built: a wet room bath and a double vanity under statement wallpaper.
An attached in-law suite is built the same way.
Its own building
A garage we turned into a home office and guest house, with a brand-new bathroom and a tongue and groove ceiling.
A detached in-law suite is built the same way.
Before you draw anything
Four questions to answer before you plan one
The building comes last. These four decide it.
Who is it for, and for how long?
A parent moving in for good plans differently from a grown kid home for a year. Start with the person.
In the house or out back?
Attached keeps everyone close and under one roof. Detached gives everyone more room to themselves.
What does your lot allow?
Whether an in-law suite on your lot can have a kitchen, its own entrance or a tenant is a zoning question, and the City answers it for your address.
What will it cost?
An addition and a building out back are priced differently.
How it starts
How we design and build an in-law suite
The same way we start any addition or building out back: we walk the house and lot with you, then one team designs it, draws it and builds it.
-
01Meet Up
We listen, walk the space, and talk budget honestly before anyone draws a line.
-
02Team Up
Designer, drafting team, and builder put one real plan and one real number on the table.
-
03Glasses Up
We build it, keep you in the loop, and hand back a home that feels like you.
An in-law suite that doesn’t match the house reads as tacked on, and everyone who visits can tell. Ours are drawn to belong to the house they’re part of.
In-law suite questions
Is a mother-in-law suite the same as an in-law suite?
Yes. They’re two names for the same thing: living space set apart for a parent or another family member, in the house or close to it. Listings use both.
What is the difference between an attached and a detached in-law suite?
Where it sits. An attached suite is inside the house or built onto it as an addition. A detached suite is its own building on the same lot, like a casita or a garage apartment.
Is an in-law suite an ADU?
It can be. ADU is the planning term for a separate living building on the same lot as the house, and a detached in-law suite is one. Whether the City counts your suite as one, attached or detached, and what it allows inside it, the City answers for your address.
What is the difference between an in-law suite and a casita?
The name. Casita is the everyday word for a small building of its own behind the house. In-law suite names who it’s for. A casita built for a parent is a detached in-law suite.
Do you build in-law suites?
Yes. We design, draw and build both kinds in Fort Worth and the surrounding area: attached suites as home additions, and detached suites as casitas, guest houses and garage apartments.
Can you help me buy a house that already has an in-law suite?
Yes. Our real estate agents help buyers across Fort Worth find and buy their next house, and a suite for a parent can be on the list from the first showing.
Can you draw an in-law suite I build myself?
Yes. Our drafting is sold on its own: we draw the plans and you can have them built by anyone.
Best Home Builder & Remodeler
Fort Worth MagazineFort Worth Chamber Small Business of the Year4.7 stars from 91 Google reviews as of September 2026
Plan an in-law suite that belongs to your house
A place of their own for the people you want close, built so it looks like it was always part of the house. Walk your house and lot with a designer and a builder, and leave with one plan and one number.