Good shout - BUT if I was going to spend any money on that complete waste of space I would brick-up some of the windows, put some sort of hipped-roof on it, insulate it, and turn it into an actual usable space. It will now stay as it is for the foreseeable future and the doors will remain permanently shut with it not being used again for 7 months (April/May'ish) time for a couple of days before its gets too hot. This is the single thing I hate most about our house, it's frustrating as it's such a dead space. I even hate it more than the bidet in one of the bathrooms which wastes space and is pointless (apart from my 4 year old using it once to wash her hands as she thought that it was a childs sink)

The design and build brief from our client in Surrey for this seasoned oak orangery was to optimise the use of a dead patio area and link two buildings; the main house and a barn conversion. Therefore extending the existing kitchen in one building through to the new orangery, incorporating a spiral staircase wine cellar within the orangery floor and provide new access to the lounge area within the other barn building. The orangery features a large oak roof lantern maximising natural light especially through to the kitchen area and as a result of using folding sliding doors on the sides allows the whole area to be open to their landscaped garden. The orangery has a microporous stain finish to reduce ultraviolet light damage and the roof incorporates the latest, soft blue, easy clean, solar control glass having a 0.9 u value and keeps out 83% of the unwanted heat in summer. Click HERE to step inside (well almost!) and take a 360-degree virtual tour of this orangery & click HERE to view more images of this stunning project. You can also watch a short video below to see how we made this project come together for our client, from concept design to build to reality! Enhance your home living environment with a bespoke oak conservatory or orangery from Richmond Oak Conservatories

I should have added that - as the scribbled plan shows - I also want to make the cramped downstairs bedroom bigger.

I'm blown away by the response on here an first would like to give my sincere thanks for all the advice. I wanted to add some more details and thoughts to everyones comments. In roughly the same order (i.e. Tamp75, Riches Interiors, keiblem, Ellie). The way we see the "study" is effectively an extension of the living room. It used to be the dining room and we were toying with the idea of incorporating it with the kitchen diner. However i felt that it would be very long and relatively narrow. The study is actually closed from the kitchen diner but we thought the flow and access from the conservatory would make the journey very long. So we asked if we could have a door there. The architect then put 2 double glass doors which we actually kind of like as it lets light through and let's us keep in line but allows cooking smells to be kept in the kitchen if required. Bu of course we lose more space in that area having to open the doors. Here is a 3d model the architect did. The utility room (in purple) would have the internal door into the kitchen, just not 100% sure where. I absolutely agree, we do not want to trek outside to get to the laundry. We have the dryer in the garage now, and it's very offputting and easy to forget to leave it in! None of the furniture or cabinets are set. They were placeholders from our architect to give an illustration. This includes the island which is a placeholder and we may not go with one depending... Also basically none of the internal walls are set, we can still change it. This, i suppose is the big thing, as if there is a better way to use the space, we're open to it! For the conservatory it's pretty much as you say RIch and keiblem. We do love it, when it's right, but can't use it half the year as it's too cold or too hot. So the current plan is to add a roof to it and any required brick work to support the roof. Hopefully this will give us a quiet space to read or do some exercise all year round. Here is the 3d plan from the architect. The "dead" zone on the right in between where the dining table is, the rear external doors, the double internal doors and the hallway door is one of our biggest current concerns. And can we fit the dining table in this area with people sat down and there is still enough space for someone get by to access the kitchen. And yes, Ellie, that is pretty much the problem in a nutshell. We have deciced on the footprint, but are very indecisive on internal walls and general layout. If we have the utility room there, there is a kind of corner that is made in the kitchen. Would it be or look weird if I put the stove and or sink in that area with it maybe looking sort of recessed? I wanted to match the wall to match the central line by the stairs to make the room see more unified and square. Example below I don't want to add anymore, as it's a super long thread again. But again i'm blown away by everyone on here so many many thanks.