Floor plan enthusiasts - please advise!!

[Ecrire]

We are buying this Georgian property in the south east. Planning permission for the proposed floor plan (attached) has been secured. Current floor plan also attached. Is there a way you can see us NOT taking on the full proposed extension straight away and beginning with the side “stores” converting it into a L shape shower and toilet? We’d block off the store door into the kitchen, make the door leading out from the kitchen an internal door and put an external door on the porch exit to the garden… or is the only way to get a downstairs loo and shower to take on the full extension straightaway
you think?

Possibly too boring a subject matter for Mother’s Day!

Where are your steels going to be?
I mean is it two lots or one across the entire existing wall.
And door for the new bathroom isn't clear? Do you enter it from the current outside wall? (So between the counters of what looks the utility)

Sorry - I just realised the bathroom is all outside.

You would need to redo at least part it I think. Would you be happy to do it twice?

Is your proposal this - have outside doors in the kitchen and the bathroom? The bathroom is 'next door' to the kitchen. And maybe put a temporary lean-to to get there in bad weather.

That may work.

If you just convert the stores to the toilet/bathroom then you will need to rip it all out when you do the full building works as it's in the wrong place. It will be all throw away work.

Yeah I think we’ve figured out this morning that it will be throwaway work. So the next question then is - would it be possible to do a side extension first and then in a couple years the rear extension?

Yes, always possible to split the work in two, but it would be a bit more costly. If budget is the issue here what about:
Knock the 2 stores together to create a utility/shower/loo.
Rear extension. Use the existing kitchen as the dining area and put new kitchen in the extension. Start the extension a little closer to the existing dining room french doors (I'm looking at the staircase and thinking there's no reason not to take at least that width to the left into the new kitchen) and take it as far across to the right as you can afford.
I wouldn't worry about the existing planning permission, I'd be looking at it and deciding if it was right for me and how I could adjust it to make it better.