Resolution of 50 cms per pixel for Mars! Excellent.

The highest resolution routinely available from NOAA satellites
orbiting Earth is 250 metres per pixel (Modis). It would be nice to
see pictures of Earth to resolution of 50 cms per pixel. Landsat?
But I can't find anything on internet.

All I want to do is check on some damaged tiles on the roof of my
house - very hard to see from the ground. A "Mars Orbiter" would be
ideal.

Jack