Stands will help, don't have the speakers touching solid floor or walls, and try and be reasonable... we all like to crank it once in a while (tinnitus being my proof of this) but sometimes it just isn't possible... I have two small daughters who go to bed early eve, and my studio is just down the hall from them. I can't have it too loud, but it doesn't stop me using my monitors properly. Set your workspace up so the speakers are as close as possible to you without being intrusive while you are working. I have headphones for when the missus goes to bed though
Headphones aren't particularly great for working on the detail of tracks but you can make broad strokes if you know what I mean.
Most of it is common sense really, but if you are being reasonable then you should perhaps as Legend4ry said you should talk to them. I know that our particular taste of music is not appreciated by the vast majority, understandable some may say, and so more than just loud music it is loud and obnoxious/heavy depending on your taste! Explain to them that you produce music, that you don't want to disturb anyone and would appreciate it if they could help find a level you are all comfortable with. When I was younger, every new place I moved into the first thing I did was go around the neighbours, introduce myself and say 'by the way, I am a DJ and so play music regularly. It is drum and bass so it does have a tendancy to travel, please let me know if it is bothering you at all as I don't want to disturb anyone while I practice'. Everyone was cool, and the only complaint I ever got was when I had a bad day at work, got back and whacked the stereo on full, which was dumb and I took full responsibility for. Nothing to do with DJ-ing though. Most people are normal, rational types who just want a reasonably quiet life. Work with them, and you may find your problem disappears fairly quickly.