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ADU Is Not A New Concept

By
Real Estate Broker/Owner with HomeRome Realty 410-530-2400 311291

My previous post suggested that changing zoning and obtaining government approval for Accessory Dwelling Units (ADUs) is a new idea, but that’s not entirely accurate. ADUs have been around for a long time. We often think of them as modern inventions, yet they’ve existed for generations in various forms, including carriage houses, caretaker cottages, in-law suites, and apartments over garages. Throughout history, families have used these smaller spaces to accommodate relatives and staff.

The core idea remains the same: a smaller, self-contained home on the same property provides flexibility, privacy, and additional living options. It’s interesting to note that when these structures were initially built, homeowners typically didn’t need formal approval. They could enhance their properties and create space for family or staff without having to navigate today’s complex zoning regulations. 

For instance, when someone found a carriage house on a special luxury estate to rent, it was like hitting the lottery. Maybe they paid rent, or perhaps they helped care for the house or grounds or looked after livestock and pets. It was a beneficial arrangement for both owner and renter.

So, while ADUs might have a new name today, they are far from a new concept, just wrapped in more red tape when it comes to building on your own property. This highlights how housing policies have evolved and the challenges we face in maximizing our living spaces today.

The core idea remains the same: a smaller, self-contained home on the same property provides flexibility, privacy, and additional living options. It’s interesting to note that when these structures were originally built, homeowners typically didn’t need formal approval.

They could enhance their properties and create space for family or staff without having to navigate today’s complex zoning regulations. This highlights how housing policies have evolved and the challenges we face in maximizing our living spaces today.

Posted by

Margaret Rome
HomeRome Realty
Broker/Owner/Realtor®

Baltimore, Maryland


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Comments(14)

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June Piper-Brandon
Coldwell Banker Realty - Baltimore, MD
Creating Generational Wealth Through Homeownership

Hi Margaret, no it's not. In past generations you see a lot of homes with massive additions of second homes, especially in the country with large farms and also large farms where the parents and kids lived in separate houses on the same land. 

Nov 11, 2025 02:27 PM
Margaret Rome Baltimore 410-530-2400
HomeRome Realty 410-530-2400 - Pikesville, MD
Sell Your Home With Margaret Rome

June Piper-Brandon 

After writing the first blog, I realized that this is definitely not a new concept!

Nov 11, 2025 02:30 PM
George Souto
George Souto NMLS #65149 - Middletown, CT
Your Connecticut Mortgage Expert

Margaret, at the mid 1900's many Italian families migrated to my town, Middletown, CT.  These families were very close, and as a result several of the homes had In-Law apartments, or a three-family house in which was occupied by the entire family.  So, you are absolutely right, the concept of ADU's is nothing new, at best they just maybe have a little different twist.

Nov 11, 2025 02:42 PM
Margaret Rome Baltimore 410-530-2400
HomeRome Realty 410-530-2400 - Pikesville, MD
Sell Your Home With Margaret Rome

George Souto

Thanks for sharing! It's interesting to see how ADUs reflect the close-knit nature of those Italian families in Middletown. It shows how traditions can influence modern housing!

Nov 11, 2025 03:35 PM
Dennis Neal
Exp Realty of Southern California, Inc. - Big Bear Lake, CA
Your Home Sold in 21 Days or We Sell It For Free

Hello Margaret. Thank you for compiling and sharing these wonderful and impactful points about ADUs. Your focus on how these units provide both versatility for multigenerational families and financial flexibility for homeowners is especially powerful and resonates strongly today. It is a fantastic way to honor the legacy of historical housing forms like carriage houses, which served a similar purpose. I truly appreciate you taking the time to post this uplifting reminder on such an important topic.

It's fascinating to see how the need for this type of housing is bringing about a reversal of the restrictive, post-WWII single-family zoning that largely banned them. If we want to truly address the housing crisis, gently increasing density with ADUs—which are a proven, historic housing type—is a smart, politically feasible approach. Great food for thought!

By the way, I agree that 'ADU' is a bit clunky! Maybe a term like 'Neighborly Homes' or 'Cottage Suites' could better capture their community-focused spirit.

Nov 11, 2025 04:44 PM
Margaret Rome Baltimore 410-530-2400

Thanks, Dennis Neal, for the suggestions of names.

Nov 12, 2025 02:43 PM
Dorie Dillard Austin TX
Coldwell Banker Realty ~ 512.750.6899 - Austin, TX
NW Austin ~ Canyon Creek and Spicewood/Balcones

Good evening Margaret,

I thought about your comment in the Zoom meeting that ADU's were not a new concept and you are so right. It's just a different perspective now but actually quite simple.

Nov 11, 2025 07:02 PM
Margaret Rome Baltimore 410-530-2400

Dorie Dillard Austin TX 

Reminds me of that saying: "Everything old is new again."

Nov 12, 2025 02:48 PM
Jeff Masich-Scottsdale AZ Associate Broker,MBA,GRI
HomeSmart Real Estate - Scottsdale, AZ
Arizona Homes and Land Group/ Buy or Sell

I agree Margaret. In Arizona we like to call them "casitas" or a guest house. Zoning is loosening up in Phoenix and other cities as well to build them.

Nov 11, 2025 08:09 PM
Margaret Rome Baltimore 410-530-2400

Hi Jeff Masich-Scottsdale AZ Associate Broker,MBA,GRI 

Anna "Banana" Kruchten says the same thing!

Nov 12, 2025 02:50 PM
Michael Jacobs
Pasadena, CA
Pasadena And Southern California 818.516.4393

Hello Margaret - change and evolution continues to "live" among us.   

Nov 12, 2025 03:34 AM
Margaret Rome Baltimore 410-530-2400

Michael Jacobs And form of evolution..

Nov 12, 2025 02:51 PM
Kat Palmiotti
eXp Commercial, Referral Divison - Kalispell, MT
Helping your Montana dreams take root

Luckily where I am we can add an ADU without permission. Not in the center of town, but outside town it's fine. 

Nov 12, 2025 04:56 AM
Margaret Rome Baltimore 410-530-2400

Kat Palmiotti

Have you had a chance to write about them? I'm really eager to learn more! Your insights would be fascinating!

Nov 12, 2025 02:54 PM
Kathleen Daniels, Probate & Trust Specialist
KD Realty - 408.972.1822 - San Jose, CA
Probate Real Estate Services

Hello Miss Margaret Rome Baltimore 410-530-2400

I've been actively showing properties to past clients in an area that tends to have larger lots ... and I am seeing many owners have added additional space for various uses, including short-term rentals.

It is a thing that has been around for a long time! 

Nov 12, 2025 09:05 AM
Margaret Rome Baltimore 410-530-2400

Kathleen Daniels, Probate & Trust Specialist 

Baltimore seems to be playing catch-up in the world of the Adu concept. It feels like we're just beginning to embrace this innovative idea!

Nov 12, 2025 02:57 PM
Lew Corcoran
Better Living Real Estate, LLC - East Bridgewater, MA
Expert guidance. Exceptional results.

Really appreciate the way you traced ADUs back through history, Margaret Rome Baltimore 410-530-2400. It makes the topic feel grounded and relatable. Thanks for sharing such clear insight into how these spaces have always offered flexibility and connection 🙂. Your perspective adds real value to the conversation!

Nov 12, 2025 01:51 PM
Margaret Rome Baltimore 410-530-2400
HomeRome Realty 410-530-2400 - Pikesville, MD
Sell Your Home With Margaret Rome

Lew Corcoran  Thanks so much! I appreciate your kind words! 😊

Nov 12, 2025 03:02 PM
Kathy Streib
Cypress, TX
Retired Home Stager/Redesign

Hi Margaret- I had a busy week, and sorry that I just got around to reading this. You're right! ADUs have been around for years, but with different names. Many older homes in Houston have garage apartments. We had one over the house I grew up in. When my mother was still living there, my sister-in-law's sister stayed there after college. She didn't pay anything for it but it was comforting having her on the property to keep an eye on my mother.

Nov 16, 2025 06:45 PM
Margaret Rome Baltimore 410-530-2400
HomeRome Realty 410-530-2400 - Pikesville, MD
Sell Your Home With Margaret Rome

Kathy Streib 

Absolutely! ADUs have been helpful for families like yours for years. It sounds like a great setup for your mom.

Nov 17, 2025 03:34 PM