Basin in loo, move master door down so you get a bigger kitchen ?
It's a tiny kitchen...for such a large dining space!
I'm sure people will come up with alternatives.

Hi Dave, two quick points. Is your original structure in excellent condition? We found, as illogical it sounds, it was more cost and resource effective to build from scratch than to renovate and extend our original cottage. I also wonder about light flow, north facing bedroom (if I’ve understood correctly) and no window in the main bathroom? Apologies for sounding like Ms DoomandGloom, as we’ve just been through this process I know how frustrating it can be, so sending best wishes.

Is it a heritage cottage, you could consider keeping the cottage separate with a narrow enclosed breezeway connecting it with a new space which includes the kitchen, dining, living, Master suite This could just be a large rectangle liveable shed done in Black with tall raked ceiling

the best way to understand how to relate to the spaces is to add scale sized furniture and generous pathways through rooms to make sure there is enough circulations space...what may feel like a huge room can become cramped after you add furniture and a few people with a door located at the wrong side of the room and nowhere to place a TV with comfortable seating ...we assume the location of the new master suite is to have a better views but it blocks northern light and views from the kitchen and the kitchen is a long way from outdoors......the plan looks good for a restricted site but when there is so much available space it's disappointing to build a house that would better suit a suburban block ... exposed rural sites need more sheltered areas around the house ..is there a garage and/or sheds, where are the water and septic tanks, the best location for driveway and parking areas?... after replacing an external wall with an expensive support beam to create the bigger living area it will be difficult to match the floor and roof structures ..i think it would be far more cost effective and interesting to build the new rooms with a concrete slab on ground and keep the original cottage separate with a link that takes better advantage of northern aspects and creates courtyard spaces that make sheltered outdoor areas that are often missing in rural developments ....what is the condition of existing structure, what is it built out of... is there an existing functional bathroom, laundry and kitchen, what is the shape of the old roof and what do you plan to use to build the new rooms and what upgrades do you plan for the old cottage?