A narrow strip can create a wide room
The benefit comes from removing the old side wall and joining the rear room to the former passage. That usually means structural steel and careful support to masonry above.
The boundary may be very close
Foundations beside the neighbour can fall within the Party Wall etc. Act in England and Wales, depending on depth and distance. The wall itself may also be built at or near the boundary.
Roof form changes the feel of the room
A fully glazed side-return roof brings light but can overheat. A solid insulated roof with well-placed rooflights gives more control and provides space for lighting and services.
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