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The premise of this question is flawed. A hotel room is pretty much defined as a place to sleep, and not much else. Once you add in a kitchen, you've moved from "hotel room" to serviced apartment (aka residence, villa, etc), and luxury chains absolutely do cater to this market. Here's a couple of random examples:

• 
  Ascott Makati -- the whole Ascott chain's concept is luxury serviced apartments


• 
  Sheraton Denarau Villas -- same management and facilities as the Sheraton Resort next door, but you get a kitchen, laundry facilities, etc


• Hilton Noumea La Promenade Residences

And yes, all of these can be booked for as little as one day, they're not just for extended stays.

NOTE: This is a speculative answer as I do not own or manage a hotel, but I have several friends who do.

It is mostly likely because people who afford luxury hotels also want the luxury of having meals cooked for them and can afford it too. So they eat in restaurants and many of those same luxury hotels offer high-end restaurants in order to capitalize on the buying power of their guests.

One can imagine that some people might prefer to have their own kitchen, but luxury hotels usually do not offer that service, because the demand is probably rather limited. Kitchens are convenient to lower the cost of meals yet consume a lot of time. Time to cook, locate and buy food in an unknown location. This might be fun for some type of travellers, but I expect that most will prefer to spend time abroad enjoying the sights, working for business trips and even trying out local dishes where they are staying.

You mention resort locations specifically and those are usually places with multiple restaurants, meal plans and all-inclusive which says that those type of locations cater more to people who would rather avoid cooking or even the effort to choose where to eat. Granted, this is not everyone, but one would guess it to be the majority.

Another point in your question is for single-bed rooms, but it is my opinion that the market for lodging having a kitchen is greater for larger rooms, particularly families. When you have small children and a number of them, there is greater need for a kitchen. Kids my be picky eaters and have a different meal schedule than adults. A meal at a restaurant sometimes can be stressful on parents when they deal with various needs and demands, not to mention the lack of children's prices and portions in some establishments.

Where we do regularly see kitchens in high-end accommodations is in remote areas. This is for people resting and escaping from it all. In this case, there is not much sense to maintain a staffed restaurant on site, but they often take orders and deliver groceries for the guests (or their cook) to cook. I have seen tours where they pick guests up from the airport, take them grocery shopping and drop them off at the remote lodging right after.

As a few comments point out, there is even a some rooms which are offered with kitchens but as you noted, this is a very small minority. Again we are talking in general about hotels of a certain rating across the world. Also for those who do need to have food in room, there is nearly always room service, many times available 24 hours/day, and delivery. With room service, the hotel also cleans up and collects the dishes from the hallway or your room the next day.

People who book luxury hotels don't have the time to cook. That feature is the kind of thing you find in youth hostels, or better hiking trail "huts". Especially today, in the age of Doordash and Uber Eats, it is insanely easy to get food of any variety delivered.

Guest cooking would compete with the hotel's own food service. They do not want you making Shrimp Vindaloo, they want you to pay the hotel's concierge to fetch it from a good local restaurant.

Of course, some hotels are willing to rent you fully equipped apartments with a kitchen, in which case your right to cook is part of the deal.

Good question.

In short I'd say that for a luxury hotel
1. An inability to guarantee quality;
2. Difficulty forecasting and managing costs;
3. Lack of reliable customer demand.

I used to audit a couple of international 5* hotel chains and have visited a good number of hostels/mid-range hotels in various capacities though I never remember someone being overly unhappy about the lack of cooking facilities. I only ever remember a few times when there was something like a toaster, microwave or a small grill perhaps to heat up that slightly stale bread just right. But breakfast is easy, low cost, easy to scale up, low wastage, most of the unused produce can be used the next day and often it is included with the cost of the room so easy to predict required staff/food etc.

If they were to provide cooking facilities what would a customer want? At a top end hotel I'd expect them to supply everything I could possibly need for me to cook my meal. Think of every type of pan, spatula, muffin tin, condiments, fruits, vegetables, meats, oven fridge, freezer. You would also need staff, at least one person just to make sure the place doesn't burn down which adds an overhead (fixed) cost. Also one day everyone may want to make something and the next day nobody does. Imagine a stag(bachelor) party is making a load of steaks but a vegan family wants to make a birthday cake for their 7 year old daughter.

Hotels can look to make profit through many services, the rooms/accomodation generates profit through economies of scale and efficiency of processes. The restaurants (of luxury hotels in particular) normally have large margins on high quality food. Hoping to draw the more lazy hotel guests and outside diners. Often hotel restaurants can survive despite only being half full on the busiest night. They already have a kitchen for breakfast and room service so why not have a restaurant as well. They tend not to offer services with low profit margins though - hotels don't normally offer a taxi service for example (apart from places such as the Burj Al Arab which you probably wouldn't describe as a 'taxi') because it doesn't make them enough profit.

Certainly - as others have mentioned - supplying cooking facilities would eat into potential restaurant profit but I'd say it's a secondary factor.

At a hostel the expectation of quality is lower and you would expect everyone there to make the majority of their meals there. Effectively making it lower cost per use of the cooking facilities, more predictable and also it's something people look for when searching for hostels.

Hotels in the middle range have to find a way to differentiate to make themselves appealing. Often it's value or they can often have things such as a bar or some other particular draw for guests.

Obviously luxury and low end accommodation do as well but it's generally fairly low on the list for people travelling who are already spending a lot of money on other things. Travel to the destination and accommodation will normally dwarf the cost of eating so travellers see it as an additional cost which is low and anticipated.

Apologies - bit of a ramble and I could go on but hopefully that gives the primary reasons.

In addition to excellent answers above, it's worth pointing out the safety issue. As soon as you allow people you don't know access to a kitchen, the risk of fire goes up many-fold. Considering that a lot of people who stay in the hotel end up being somewhat intoxicated, alcohol doesn't mix well with kitchens.

In addition, would you risk having one guest who burns his hand while cooking then suing you for damages? Because you didn't provide something or other or because they simply want to get money out of you?

If you are okay with one or two fewer stars on your Hotel you can quite easily find one which offers this.

But you should probably be searching for private rooms in "Hostel" instead of "Hotel".

And also be prepared that some of the people preparing food will be staying in the hostel part of the establishment, some to reduce travel costs but some also to socialize a bit.

A couple of big reasons against shared kitchens will be familiar to anyone who has ever lived in shared accomodation:

• How sure can you be that your stuff is still there when you want it?

Or:

• Does the hotel provide food storage (fridges) in every bedroom - how far away is that if you forget something?




• Who decides when food is old and to be disposed of?



• Who cleans the kitchen and the dirty dishses that some users leave lying around?

The need is covered by serviced apartments, aparthotels, motels with kitchenettes etc. as well as a few hotels that provide a fridge and microwave as well as the usual hot-drink-making facilities.

On holiday I've stayed in plenty of examples (mostly at the cheap end of the market, but also a suite-hotel at an airport. These were mainly in the US/Canada, as I tend to stay in standalone self-catering accomodation in Europe.

On business there's less need (and time) but sometimes a simple cold meal is desirable if you've been overly well-fed on the rest of the trip - a fridge is the most you need for that; I've been known to use a portable (Peltier) mini-fridge. The rare exception is people with severe dietary restrictions, who can sometimes struggle when travelling.

There is no market for a shared kitchen.

You proceed from a false assumption. People staying at the Four Seasons are not interested in preparing their own meals, unless they have a 'residence' style room and hire a chef.

Some properties (no refs, but I'm 98.7% sure) allow guests to self-cater events which gives them access to a private kitchen, usually for a hired chef, but I doubt that's a hard requirement. This would come with a substantial fee to cover cleaning. You will not find communal kitchens due to servicing/sanitary issues not to mention scheduling.

Also, hotels with in-room kitchenettes are very, very common and precisely satisfy the market you are asking about.

First of all, the premise is at least not 100% true: I know at least one small hotel chain (ca. 7 hotels in an European country) which offers appartments with a small private kitchen. Not 5 star, but not youth-hostel-like either; and those are their standard rooms, not special ones. ~100-120€/night, so not super cheap either.

Second of all, while I love that feature, my wife would never enter such a hotel. It would remind her too much of house work, she wants to get away from that. (And no, it's not only her job to cook at home, that's not the issue.)

Third of all, while I love the in-appartment kitchen, I would never use a shared kitchen. I do not usually use any shared facilities at all in hotels, mostly because I don't use any facility except my room, at all. Hotels are a base camp for me. If I had to bother finding the kitchen, lugging my stuff around, getting acquainted with the procedures, having to buy ingredients beforehand etc. - then I'd be more likely to grab something which can be eaten without cooking.

If price were the main motivation, then I'd not go to a hotel in the first place (but a "mobile home" or AirBNB or whatever).

Considering the fact, then, that having such a kitchen would directly cut into their own kitchen sales, and is more effort for the hotel owner all over, and is either too full or too empty by Murphy's Law, those are plenty of reasons not to have them, in general.

A hotel is a place that offers a quite specific service: an accommodation, not a sleep-over. People pay much more than for hostel or private apartment, but they receive a package of services, including food and cleaning services. So you don't have to loose your precious time and concentrate on sightseeing.

Another aspect is, that hotels, opposite to hostels, are for people who want to enjoy their time alone / with friends and not share their place with other people, which a potential for interpersonal conflicts and lost nerves. Imagine your grandparents, for example. According to your questions, they make problems for sport everyone where they arrive. Avoiding conflicts with people like them is exactly why I prefer hotel over hostel, even if it costs me much more. I'm on my vacations to rest, and not to quarrel with random strangers who find it funny to ruin the nerves of other people ;)

Of course, hotels doesn't want to compete with their restaurant service as well.