There is something to be said for that.
In my second bout with poverty, I shared a tiny concrete block house in a poorish part of Gainesville FL, built circa 1960.
The owner had bought it as a wedding gift for his daughter, who refused to live in the dump.
It used propane gas, no sidewalks or curbs, carports but no garage - got the idea?
Full Mba. Go figure.
I’d call it right about 1960 when they crossed from upper-middle class to anything with windows*.
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- windows are expensive - truly cheap houses have a few tiny windows. Then (1950’s) everybody had to have a “Picture Window” - and the race was on.
Stupid question: what defines a master bathroom vs a regular full bathroom? I don’t think most places I’ve seen have what I’m thinking of as a master bathroom.
A master bathroom would be a (usually full or 3/4) bathroom that is attached to the master bedroom (ie, the door to the bathroom is in the master bedroom). In some cases, there might be an additional door to the hallway as in aceplace57’s case (and the case in the house I lived in the longest growing up). While a real estate agent might call that a “master bathroom”, some folks might insist a master bathroom have a private entrance only.
I am 35. From birth through age 10, I mostly lived in 2BR 1BA apartments. When I was 10, parents bough a ranch built in 1974. No master bath. When I was 18, I rented my own house. It was an older 4BR house in a college neighborhood. No master bath. Next house was a 3BR 2BA duplex built in 1985- no master. Then I rented or shared a series of newer apts the next 5 years. One 2BR 2BA apt had a master. Current house, “starter” home (though I see no reason it would ever not be more than enough for a family of 4) built in 1994, is 3BR 2BA with a master (shower, no tub).
I call it a master bathroom if it is attached to the master bedroom only. You don’t have to go in the hall to get to the bathroom, and no one in the hallway can enter the bathroom without going into the master bedroom.
Other people think of it as a bathroom off the master bedroom even if it also has a door from the hallway where people can enter. This kind does double duty; the occupants of the master bedroom can use it without having to go in the hallway, but the rest of the household can use it, too. My aunt had one of those, but I really dislike having two doors that open into the bathroom because either I would forget to lock one of them when I went in, and someone would barge in, or I would forget to unlock one when I left, which annoyed someone trying to get in that way.
I believe it is a bathroom accessible only from the master bedroom.
Yeah. But some of them get really ridiculously huge. 20-foot ceilings and full gardens (with a wall to block the lookey-loos) behind floor-to-ceiling picture windows and separate his-and-hers 10-foot vanities and whatnot. On some of the floorplans, the master bath is far larger than the smaller bedrooms.
To each his own, I guess. I’d prefer to have the extra space for bookshelves. 
OK, in that case, I’ve never lived in a house with one. I don’t see those so much around the city, myself, but I live in the “bungalow belt” of Chicago, which tends to have homes from circa World War II. Off the top of my head, I only know a couple of friends or family who have a master bathroom, and they all live in the suburbs. My parents, who live in a suburban ranch-style house built in the 70s, don’t have one in theirs, either.
A bath with two doors is, in some locales, known as a “Jack and Jill” bath, esp. if the doors both lead to bedrooms - i.e. 2 bedrooms share a bath. In this case, there would need to be a separate bath for other occupants and/or guests.
I, on the other hand, was born in 1960, have lived in several houses - six to be exact - and have never lived in a house that had a master bath.
That’s very true. My DC row house had three bedrooms, one of which was fairly small, and a tiny kitchen. It also had a parking pad.
I’ve been looking at older houses, and not many of them have garages. I’ll be lucky if I get a carport.
Does it count if the bathroom has two entrances, one to the master bedroom, one to the adjacent hall? I always found that sort of arrangement weird, but have seen it here and there.
My house (ranch with basement) was built in 1969 and has no master bath. Just one full bath that has a door in the hallway.
My parents’ house, where I grew up, in the very same neighborhood, also a ranch but with no basement, has a master bath. It’s a “water closet” sized affair, tho. Just a half bath. It was built before mine, 1966 or 67 I believe.
FWIW my parents’ full bath used to have 2 doors, even though the room was tiny as heck. But it didn’t open up into the hall and bedroom or something - just one into the hall and one into the laundry room. They had it remodeled and removed a door.
IANAA (I am not an architect) but I would say, “No”.
I live in a two-bedroom unit of a largish apartment building (and as far as I know has always been apartments) in San Leandro, CA, that was built in 1966. It has a teeny tiny master bath.
And looking at the archaeological record, didn’t the home in The Brady Bunch have a master bath (as well as a Jack & Jill for the kids and presumably Alice had one of her own) from the parents’ bedroom? So side, question: First master bath shown on TV?
Okay, now I have a question for the folks on the other side of the Atlantic:
In England, the master bathroom is proudly called the “ensuite” (I suppose because that makes it sound all posh* when the estate agent advertises the house.).
When did the “ensuite” bathroom become common in England?
*(for Yankees: “posh” is British slang for “fancy” -i.e. upper class.
I originally typed “make it sound all fancy”, but then I realized that British people think “Fancy” is a verb. Strange people, those Brits. 
)
Indeed, they invented a language they cannot speak.
It’s called an en suite in pretty much every house-hunting show I’ve ever seen, also, even American-produced ones.
If you’re thinking of the house-hunting shows on HGTV (Love It Or List It, for example), many of those shows are Canadian. I think that explains the use of the phrase “en suite.”