Recent blockbuster Bad Neighbours is a story about a young family that wars against new neighbours: a Fraternity. While this would be an extreme example of bad neighbours, the truth of the matter is that sometimes bad neighbours are inevitable.
The first tidbit of advice I would give would be PREVENT IT BEFORE IT STARTS: We typically choose where we want live, and we often inspect the home top to botton, why not do the same about with the neighbourhood. Has your potential next door neighbour failed to use a lawnmower all summer? Are there piles of garbage throughout their backyard, perhaps attracting pests? Do they run a small business that creates noise like a mechanic or wood shop? Do they own 17 vehicles parked on the street, never allowing space for your guests? If these or other red flags are popping up, be careful to weigh your decision with what you are willing to tolerate.
What if you already have them?
TAKE ACTION: Every circumstance is different. For extreme cases, one option is to research your local by-laws and if neccessary report them. This often results in a warning from the city before any consequences are dealt out. If you are annoyed by their behaviour but they are not breaking any rules, keep in mind the golden rule. Relationships are all about give-and-take. Maybe they threw a bass-thumping party this Saturday, but they are unlikely to complain when you throw your X-mas bash.
MAKE A PEACE OFFERING: The olden days carried an element of charm, didn't they? I remember the days when a new neighbour would move in and someone would bake them brownies, or a casserole. Well I say: Bring back the charm! Kicking things off with a little goodwill might make them more receptive to being a good neighbour back to you!
GET THE HELL OUT OF THERE: A friend of mine had a neighbour that was physically violent towards others and flew off the handle over the smallest things, resulting in him spending time in and out of mental institutions. There will be times where the only reasonable option is to move. (I'm trying to say the word move without a smile) Guess what! I have a great realtor you can call if you are in the Lethbridge Area :)
I would be happy to meet with you to discuss the value of your home in today's market.