“Kitchens and baths/bathrooms sell houses” is a popular real estate adage of unknown authorship. Kitchens and baths have a lot of features to them, and updated equipment helps to sell a house or an apartment.
   
“Decorative kitchens, baths sell house” was printed in the Fair Lawn-Elmwood Park-Saddle Brook (NJ) Shopper on March 20, 1985. “Kitchens and baths sell houses” was printed in the book The Complete Guide to Contracting Your Home (1986).
   
           
20 March 1985, Fair Lawn-Elmwood Park-Saddle Brook (NJ) Shopper, pg. 39, col. 3:
Decorative kitchens, baths sell houses
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According to top building industry and real estate sources, buyers today rate kitchens and baths 1 importance behind home price and location as factors which influence their decision to purchase.
 
Google Books
The Complete Guide to Contracting Your Home:
A Step-by-step Method for Managing Home Construction
By Dave McGuerty and Kent Lester
White Hall, VA: Betterway Publications
1986
Pg. 185:
Remember, kitchens and baths sell houses.
 
22 December 1991, The Palm Beach Post (West Palm Beach, FL), “How to clean up when you sell your home,” Residences sec., pg. 2, col. 3:
Kitchens and baths sell houses and a thorough cleaning of those rooms is critical.
 
Google Books
The Complete Home Buyer’s Bible
By William J. Molloy
New York, NY: Wiley
1996
Pg. 91:
Kitchens and Baths Sell Houses
You may hear the expression, “Kitchens and bathrooms sell houses.” These areas will usually have the most custom items to show.
 
Google Groups: alt.home.repair
Top 10 Home Improvements
DFWINSPECTOR
10/7/97
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as you can see, kitchens and baths sell houses.
     
Google Books
The Apartment Owner: The Official Publication of the Apartment Association of San Fernando Valley/Ventura County
The Rental Housing Owners Association
VOlume 39
2006
Pg. 36:
Everyone knows kitchens and baths sell houses. And guess what? They also rent apartments!
 
Twitter
Susan Atwell
@AtWellStageHome
Kitchens and Baths Sell Houses - Part 2 - Bathroom Staging Tips (includes before and after success story) http://budurl.com/zw3s #stager
10:53 AM - 25 Apr 2009
   
Twitter
Signature Cabinets
@ursignaturecab
selling your home? Kitchens and baths sell houses! Let us help you give your house the real estate edge!
9:33 PM - 17 Oct 2010
   
Twitter
Greensboro Buzz
@greensboro_Buzz
Your Home: Tiles: How many times have you heard me say that kitchens and baths sell houses? All the time. Last week,... http://dlvr.it/15911n
10:40 AM - 14 Jan 2012
   
AZ Big Media
1st rental property rehab: 5 lessons learned along the way
REAL ESTATE | 20 Oct, 2018 | HIPPO
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A realtor friend once told me that kitchens and baths sell houses.
 
Twitter
Kristie Barnett
@thedecorologist
You’ve heard that kitchens and baths sell houses, but did you know that the living room is the most important room to ...
#staginglivingrooms #howtostage #homestaging #psychstager #eps #psychologicalstaging #thedecorologist #cornerfireplace #openfloorplan https://thedecorologist.com/product/psychological-staging-living-rooms-video/?utm_campaign=coschedule&utm_source=twitter&utm_medium=thedecorologist …
7:00 AM - 2 Jan 2019
 
D magazine (Dallas, TX)
Five Questions from a First-Time Kitchen Renovator
They’re still one of the best rooms in your home to invest in, but where do you start?
BY KIMBER WESTPHALL PUBLISHED IN LIVING JUNE 25, 2019 3:34 PM
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The old adage that kitchens and baths sell houses still rings true, especially when done well and completely.