A little-known government initiative offers 40% tax relief on money spent turning unused space such as storage rooms into housing for people on low incomes.

These extensions into the unused space between houses allow for the creation of the open-plan, light-filled spaces that are at the top of buyers' wish lists.

Especially useful designs for those with small bathrooms, she adds, include shallow cabinets with sliding doors, and corner units that can be tucked into unused space.

Many new hidden homes sit in plots between or at the back of existing houses, where an architect has spotted the potential to make the most of unused space.

I just wanted not to feel guilty about the unused space, plus help a hard-up nurse.