Brick Exterior: Paint it or leave it?

[TJ Thomas]

Just purchased a home with a nice red brick exterior. Looking at current trends, I am tempted to paint the brick to have a cool grey finish. However, I wanted to get opinions on painting brick vs leaving it natural in terms of resale value down the line, because there is no going back from painting brick. I'll be living in the home for the time being, but definitely don't want to do something that will kill resale later on.