Redecorate it in the most horrendous way. There was a player on my server that had a bunch of FC's with 2 people in each, and 4 small houses. Each was decorated inside and out to just be annoying. I never met the player but I swear he just did it to be a troll. Luckily when they restarted the demo timer the houses all went poof but it was effective, although inconvenient to you for sure. Sorry about your annoying neighbors. That bites.