I like the idea with the pink highlighted edge. This opens u the kitchen dining space but keeps the lounge and study separate as you wanted. I would add bifold doors if possible along the back wall of the dining room to make it feel even bigger. Hope this helps

rough sketch of outline may help!!

If I'm being honest, I'm really not sure on this layout. You have services on both sides of the extension, which even with my limited knowledge of building is expense that you could avoid. Do you need a laundry and a utility, or could you combine them.? Also I hate the idea of a toilet off the kitchen. The garage also looks small. Could you take out the door on the garage and make that the bathroom off your corridor, and make the corridor your utility. Then you have all the space free where the new bathroom and utility are. If you want more space for the utility and bathroom I would suggest bringing that wall in (make kitchen and dining narrower) and that would have the advantage of making your study wider. One other point is that leaving the study there with a window to the side will make the kitchen very dark.

Hi, advice gratefully received. Love our new house, but the ground floor layout is not great. Long narrow kitchen facing east, garden is big so scope to extend. As it stands you come in from the hall into the lounge to get to the kitchen. I would like to have some separation so that the lounge can be closed when desired. Perhaps some double doors? I was thinking to use a chunk of the lounge and knock through into the kitchen which would also allow more light. Lounge is lovely and light, kitchen is dark after lunch. Ideal solution would be a side extension, but drains and pipes in the way so worried about the cost.. Would only require about a metre wide along the actual kitchen which I would then face towards the garden and create a sitting area. Any ideas welcome P.S. Conservatory is a junk room at the moment, facing a fence on the right hand side. The garage is used as a utility.