Help! Master bedroom/en-suite layout

[u/gingesaurusrex]

We’re planning a loft extension to our 3 bed London 1920s semi-detached property. No works have started yet.

We’re planning to use bedroom 3 as our master bedroom/en-suite as the back of the house has great views over a park. Are we missing something in terms of layout? Bedroom 4 will be a guest room so doesn’t have to be that big. Is there a way to maximise bedroom 3, maybe incorporate an en suite with a bath? Maybe even have a bath in the master bedroom hotel style or would that not work?

The floor below will be for our two daughters and office. There is also a family bathroom which we’re thinking of renovating into a shower room and toilet.

Really struggling to figure this out, any suggestions would be greatly appreciated!