Basic design packages don’t allow you to draw in sloped ceilings. So I think you need to enlist a designer or concept planner who can create the room in CAD and help you visualise the space including the ceilings. Try a search on Houzz for professionals. OnePlan is a regular contributor, you can look on her profile to see her past projects, and a quick message to her will start a conversation about different levels of service.

Thanks for all your replies - I really appreciate it. We do currently need all four bedrooms as we have 3 children. Whether it is our forever home really depends on how much we can expand. It is a semi detached 1930s property. The current owners have already extended to the side to create a fourth bedroom downstairs and have extended to the rear for a bigger kitchen. We are hoping to eventually extend on top of the current side extension - I'm guessing if we did that we could make bedroom four bigger and build in to it to create the en-suite? Here is the whole floor plan

Generally a 4 bed house wants two bathrooms but the room sounds too small to add even a tiny en suite. Is that the biggest room? Could one of the other rooms have the en suite added, or be reduced in size to accommodate the en suite to the master?

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