British houses are quirky. They come in all different shapes, sizes, and layouts, from the small back-to-back terraced mill cottage in industrial Lancashire, to the spacious Victorian builds of our urban towns and cities; from the modern townhouse to the open-plan studio to the residential park residence. And each one is a castle - many owner-occupiers make a habit out of improving their habitat, both with their time and their money. The plethora of television makeover programs in recent years means homeowners are keenly aware of how to best use the space their living quarters offer. Most homes have an unusual cubby-hole, glory hole, a hallway that seems to end suddenly and without purpose, or a box room. When you were first introduced to your potential new home by the estate agent, you might even have enthusiastically pointed and said, "something can be done with that space". It might be that a particularly small room could be made to feel less cramped "somehow", or there is the prospect of installing a second loo in that difficult space under the stairs. Each choice you make can be the difference between a DIY success and a waste of money - after all, home improvements should be practical, attractive, and fit your budget. With these criteria in mind, it's worth considering the make-over project from every angle. For example, a project to redecorate a box room might begin with a splash of paint and some online shopping for items that make the most of the floor-and-wall space might be turned on its head as you check out if, actually, that wall right there can be moved to steal 12 inches of the room next door. If space is a major issue, is the door in the right place, can it be moved, re-hung to open outwards or should it be replaced with a bi-fold version? The substitution should ideally be of a style sympathetic to the others and the age of your home - it might be possible to match a look close enough to the existing ones, meaning aesthetics don't have to suffer for maximum practicality. Bifold doors come in two halves and are hinged so the parts can fold in on themselves. Thinking outside the box, the more innovative home decorators will recognize they offer an opportunity for more than just small spaces - two bi-folds could be used to span an archway between rooms, or multi-fold designs that could be used to fill, hide or contain any unusual space a house might have.