The opening back into the house can become large
Removing both rear and side walls may leave little original masonry at the corner. Structural design can require beams, posts or a frame rather than one simple lintel.
Roof drainage needs somewhere deliberate to go
Large flat or low-pitched roofs collect significant rainwater. Outlets should not be treated as an afterthought, particularly where parapets or neighbouring boundaries limit discharge routes.
A drawing can make a detail look settled before anyone has checked the existing building. Measurements, drains and structure still need confirming on site.
Think about the room you are creating
Very large open-plan rooms can lack places for storage, radiators, switches and furniture. A utility room, pantry or short section of retained wall can make the finished space work better.
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