A recent study by the RAC stated that at least half of Britons never use their garage to park a car. Anecdotally we estimate the figure to be higher. Four in ten said they could not get their vehicle in because it was so full of junk.
The RAC considers one of the reasons to be the nature of modern cars. They are no longer so prone to rust from the elements and rarely do we have problems starting them in the morning anymore. With that in mind, most people just end up filling their garage with the overspill from their home and garden.
When making the choice between a beautiful extra room and finding another home for their clutter, most people will make the effort to have a clear out. Tools and bikes can go in a garden shed or outdoor storage cabinet. The rest is usually nothing we really need. With that in mind of you told most people they could add somewhere between 10 and 20% value on their home by converting their garage it seems a very sensible option.