Our 1929-built red-brick 3-bed detached bungalow has a reasonably sized garden and still has an underground air-raid shelter. It is about the size of a small bathroom and has an overground concrete 'canopy' for the stairs and needs some tidying up if it were to be used for anything. We have considered using it for storage etc (Garden equipment etc).

However, we have also seriously considered filling it in.

Now, I know it is quite novel, but it is in the way truthfully.

The question is, do you think it add's to the value of the property? Or should we just fill it in?