Can I Change The Locks On My Door?

The landlord has to have access to your apartment in case of repairs or emergency. I would think that if they let you change the lock it would have to meet their standards and also that they will want a key for the new lock. Better ask your landlord before changing it.

My landlord and I had a dispute about rent and deposit.  She changed my locks with out me knowing....I came home at night and I could not get in my apartment.  I had to call locksmith to let me in.  Did she have the right to do that to me with out me knowing and my belongings being there?

I think it depends on your contract with the landlord. But in most cases, you can't change locks without discussing with the landlord or letting agency. You may get fine if you secrectly do this. Check with your landlord first!

Yes you can change the locks on your door. You have to make sure the landlord knows it and is giving a spare key in case of emergencies. Just save the old lock and put it in a box for when you move out so you can put it back on when you choose to move in case the landlord doesn't like the new style

I have always heard that you can not change the locks without consent because you do not own the property. Most landlords will not have a problem with you doing it, but need prior notice and need to give the owner a spare.

Do landlords have to change locks after last tenants as they were drug dealers and the new tenant is worried that they may still have key to house and be able to get in and steal new tenants possessions

You can but the permission to ask is to the land lord you can't just do it your self.

You can, just give a copy to the landlord, that is must.  Plus, check you rental agreement, I imagine that tampering with locks would be grounds to evict you.  Be careful here