Sometimes it's not even a "room".  It can be the area/location, the outdoor space, the "feel" ---- so many different buttons can be pushed before the sale is signed and a "done deal" occurs.  

I think, in general, it's the kitchen, but certainly other factors can really be important to some buyers - an oceanview for example.

In my experience it's been the kitchen, closely followed by the master bedroom Peter Mohylsky 

Rooms may sell it, and for each person this may vary.  However that first impression from the curb may lead to a first impression that is nearly impossible to change. So in the end it may not be a room that sells as much as it is a front yard.

Kitchen is a big one. I think a MBR with all the bells+whistles seals the deal. 

I agree for the most part Peter. Kitchens are the heart of the home and a gathering space for owners and friend and family. Bathrooms and bedrooms can be updated.

kitchen.... for all the years I've been in real estate....  we all congregate in the kitchen and that's why I have an island that seats 10...

The old adage is Kitchens and bathrooms but I think the kitchen is high on the list

All of the above.

It depends on the buyer... too hard to generalize. In one case, what sold my buyer was the horse barn and that's not even inside the house!

Given it tends to be the most expensive room to remodel and the most used room arguably, I agree with you; The Kitchen.

Fascinating to ponder this as we are purchasing the home, location and condition of it all. Then, we break it down to proces the plus and minus at some point. Location with a drive on the way starts it off with Curb appeal on approach. Then we enter and we see, entry hallway, living room and a few steps or turns later the kitchen where an impact is made (or not). The master is of interest along with the flow of the home. Yard rear and sides come under scrutiny with a friendly eye toward the garage. The package is under review and we roller-coaster through it all is my take

The butler in the library with the candlestick.

I think if one looks at where the most investment is made the following pattern appears:

1. Kitchen
2. Outdoor living space (pool and cabana)
3. Owner suite

The closer #1 and #2 are the same space, it gets even better.

Looking at what % of cost builders allocate for each space is also revealing.

However, what really sells the house is the buyer seeing the desired TRANSFORMATION of their life into what the house promises. (family/friends gathered in the kitchen could be that transformation) For the ordinary, that could be a kitchen, but the extraordinary it may simply be sunlight.

It's a package deal, usually. Many think it's the "hearth of the home", meaning the kitchen. However, it's the curb appeal that gets buyers in first or makes them drive right by.

Kitchen & bathrooms, location.

Another vote for kitchen however here in Colorado where we have frequent large hail and need room for snow blowers and other space eaters, in addition to all the cars, garages are a big factor.

Also basements. Is it full or small, bright with lots of windows and a walk out or dungeons. A typical house here is $400,000. If half of the square footage is a full basement you’re paying $200,000 (ok, not exactly but bear with me) for that basement, or half of your mortgage payment.

When buyers look at it that way they become far more discerning about the basement than the master bedroom, etc.

You can upgrade bedrooms, bathrooms and living areas much easier than a garage that’s too small or a basement that is less than desirable.

And trying to sell an unfinished basement is the least desirable of all.

$200,000 for a place to store stuff you don’t use, and a place for the exercise equipment you don’t use 

The kitchen is high on the list.

Looks like the consensus by the majority agrees with me; the Kitch!

I whole heartedly believe that the kitchen is of the utmost importance with most buyers.  Naturally, there are buyers that go against what we typically see, but a buyer that doesn't care about the kitchen is rare.

Kitchen.  

I would think kitchen as well... usually more costly to replace/update than other parts of the house. Having said that, if the layout of the home is crummy and won't work for buyers needs, then a great kitchen may not help the cause.

Kitchen followed by the master bathroom for the most part. 

It is almost always the kitchen, followed by the master bedroom and bathroom.

Most of the times is the kitchen and bathrooms.

In general, the kitchen. For me, it's the LOCATION, i.e. being able to breathe, watch, see the ocean, nothing else matters as much.

I agree with the kitchen but I also like the view

Kitchen usually.  Baths are secondary.

For most it is the kitchen. Some of my guy buyers are in it for the garage. Of course, if they're married, they have to find the house that has what the spouse wants too. 

Kitchen, bathrooms.

I do not believe any one room sells a house. It depends on the house, the buyer, and many other factors. 

I just sold a house because of the backyard for the dogs! 

It varies.

Depends on the age of the Buyer for me.  Many Millenials eat out more often then not and are unable to cook.  Many Seniors are emptynesters and prefer to eat out or order in.  I've had many clients who have no interest in the kitchen whatsoever but instead, demand the ultimate master bath or media room. 

Kitchen

Every house I've ever bought has been bought because of the kitchen. The other rooms are basically just walls. Layout is important also.

It's different for men and women. Females usually like Kitchen, Baths, Master bedroom. Men like garages, storage, attics, patios, basements.

Peter Mohylsky it depends on the house and the area, but kitchen gets lots of attention.

The Entry seems to be the focal point and determines whether the buyer is going to give the home a fair chance.  A lousy entry clouds the rest of the showing even though the kitchen does sell a home it may be too late by the time they get there.

Kitchen, bathroom

in my market it's generally the porch.  Because it has the best view of the lake.

Kitchen.  Aka the "heart of the home".

Cheers!

I think the kitchen sells the house. Some of the other areas may prevent it from being sold.

Depending on the buyer, could be the kitchen, master bedroom/bathroom or the garage!

I would say 

1 Kitchen

2 Master Bedroom

3 Back Yard

The kitchen, and it's not even close! Most buyers can work with some short comings, but not the kitchen. I've seen buyers that bought homes just because of the kitchen. Buyers can like everything but the kitchen and the home is a nonstarter 

I do not believe that you can generalize and say ONE room sells a house unless a specific house has that one room that is just spectacular and unique and appeals to that specific buyer.

Specific rooms - a kitchen, for instance - may be more important than other rooms, but it is the whole house that is being purchased.

You can have a grand slam ooh la la kitchen but if the entire budget was poured into where the vittles are whipped up to serve steaming hot and tasty. Well, once the buyer who is smiling ear to ear in the kitchen moves on, starts touring the other areas that are not up to snuff and out of whack... it's "NEXT House Please." Too much work. Spread the love around to bring all the rooms of the house up to snuff. Your favorite, mine may not be the same pick by the buyer in the eenie meenie miney moe. They better all look good on the team approach to sell the home Peter. That said a bathroom with working plumbing is pretty special when someone in a family tugs on the parent's sleeve and whispers "I gotta go... NOW." 

I agree. I think a great kitchen is key to a home selling quickly.

Whatever condition the house is in... CLEAN is the most important. 

A recently updated, higher end, kitchen never hurts.