I'm reasonably confident that your insurance permits you to park your car other than in your designated parking place when you've no alternative other than to do so. If you want to be ultra cautious though, you could write a letter to your insurer, telling them that you'll be parking on the road until such time as you can get your parking space back.
(That assumes that it's being nicked on a regular basis. If say, someone visiting one of your neighbours has just parked there overnight, I wouldn't worry about it; your insurer knows that there will be times when you can't park in your regular place, such as when it's just been resurfaced and the tarmac/concrete hasn't yet set or, of course, when your away from home for the night).