The three basic components of visitability are an entrance with no steps, ground-floor hallways and doorways wide enough for wheelchairs, and a ground-floor bathroom big enough for a wheelchair to enter and turn around.

So what do disabled people want out of new houses, and how much is it going to cost? The Advisory Group is currently working with the National House Building Council — the body which oversees design and building standards in the private sector — to thrash out the bare minimum requirements for 'visitability,' and their cost.