In my opinion your plan looks like a typical suburban kitchen and given the architecture of the house you should be aiming higher. In my opinion a U shape of units doesn’t suit the corner window and you should be working to continue the simplicity of the architecture. I would want a contemporary handless kitchen with wide drawers and a palate of dark textured grey warmed up with a minimal touch of wood. I would put all the appliances together in a tall bank and then have another tall bank with everything hidden in them. I would make a decision about what goes under the windows based on their height- I might choose reduced height wall hung storage drawers then have the same put in the living area at a lower level to hide AV equipment. I would have the sink, DW and hob in a peninsula and have a flush fitting ceiling extractor above. Remember to source whisper quite appliances. Although you could probably fit in stools at the peninsula I think less is more in this case as it is not a massive space I would choose an eclectic oversized refectory style table with mismatched chairs and low but simple pendant lights over it and make this the key sitting area for guests with drinks. I would want dimable LEDs in the kitchen ceiling, LED plinth light, some walkover up lighting/ wall washers in the living area plus task lighting and then outside the glass doors I would have walkover lights in the patio. For this principal room I might even consider a lighting technician to put in a system that helps you get the mood right. Personally I think you should be looking for a kitchen showroom that specialises in contemporary kitchens or a designer that has a portfolio that includes this sensibility. Given that this is the main room you must get it right. In the utility area I think it just has to work. Personally I would put extra tall units in here to maximize storage and reduce the need for cabinets that could crowd the kitchen space.

Hi OnePlan, many thanks for quick feedback. Valid points you made. The hallway to WC has a small cloakroom before you enter the WC. This is because I may not have enough space to put a door due to some structural elements and the clearing from front wall to stairs is just 36 inch. This is a southern aspect garden . I plan to put some sky lights/windows across the width of rear extension so yes its a valid point about evening sun affecting TV. Peninsula is also good option to give us more spaces. Let me work it and post back results. We could open a door to pantry/laundry room but then loose the wall to put stuff.

First question to me is: do you have a tight budget? If you don;t I would take the opportunity to open up your ground floor more - on the other hand if your budget is tight than look at the finishes, make sure you are selecting neutral/white/light tones - the plan is deceiving - let me know if you need help. M_

For me, the question would boil down to how much is it a pantry vs how much is it a utility? If it’s a room that will actively be used while cooking, then the cook will appreciate having it kept tucked in their working zone corner. But if it’s the type of room used by the whole household for not only laundry but also hang up their coats, store the dog lead, keep the kids art supplies, etc the cook will prefer the entrance is on the other side of the island.