What kind of ‘thoughts’ are you after?
Feedback on what, the drawings, the design, the practicalities?
The first thing to do is establish exactly what you need to achieve. That plan has lots of things tacked on, but what the criteria is or the desired outcome is, are unknown - and therefore so are the options.
The second thing is "What are the constraints"? Where are the neighbours, the drains, the garden etc.
eg why is that wall at the back stepped in like that? Do you really want a porch in one brick and an extension tacked on to it in another brick on the front of your house?
Something like this springs to mind, maybe an American FF in the recess behind the utility ....
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Have you got views at the front or back?
Do you want an office? Would it be used regularly or rarely? Would it do double duty as a kids room/anything else?
Do you prefer open plan or discrete rooms?
Where's the entrance to the downstairs loo?
Does the wonkiness in the neighbours' extension run away from you or over the boundary into your plot?
Are you up for major rejigging or do you just want to add volume as cheaply as possible?
Based on what you've told us so far, I'd try and carve off some of the garage into either the kitchen or a utility room/downstairs loo, keeping a passageway to the back where you can smash your shins on stored bikes.
Views permitting, I'd put more glass in the south-facing wall, less at the north, minimise internal walls and get some sightlines (blue lines) from the front to the back to take sunlight into the rear and make the space seem bigger.
Move the front door and add light to the new, bigger hallway.
Maybe have some sort of visual breaks (green lines) for the office / NW room... an archway, bookcases, whatever. Maybe you'll keep the stepped wall and have a boxed in beam anyway. Add as much visual delineation between office and kitchen/diner as you want.
Take the chimney breast out if you don't use it, liberate the space, move the telly there.
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