how much roughly would it cost for a lock on my bedroom door?

Here's a simple suggestion:
1. Find a locksmith on or in the phone book.
2. Ring them and ask them.

done by a locksmith £120+ done by you 10-20 pound

about 50/60/pound ask a friend to do it for you locksmith very expensive

You'll probably need a new door, as most internal doors are not sturdy enough to have 'proper' locks fitted.

100 quid for door, 50 quid for lock, 200 to fit lock & door.

350 quid.

a yale type cylinder one is easy to fit yourself and costs around £15

A simple 2 lever door lock will cost about £5. If you could fit it yourself then that is it. If you call a proper locksmith then you will pay a great deal of money for fitting. Find a local jobbing man to do it and he will charge about one and a half hours labour. That should be about £30. You buy the lock and give it to him to do the fitting. Otherwise they try to charge extra for the lock as well as the labour which will include going out to buy the lock. I would do it for you for the £30 if you lived near by.

A 2 lever lock is sufficient for an internal door lock. These can be bought from as little as £5 but can be much more depending on make.

You will need a hammer and chisel, and a screwdriver to DIY so if you haven't already got these price them into the job. Cheap tools will cost you about £10 and it wil probably take you a couple of hours to do it. You must be accurate with your measuring and positioning or the door will not close/lock

A handyman will charge about £30 but you will still need to buy the lock. He should have his own tools.

A locksmith will charge about £50 plus call out charge which will vary from £50-100 depending on where you live and how urgently you want it done.

I did my own just fine.

try to get it done by someone like your friends or family because locksmiths can be very expensive costing you in excess of £120 onwards.

try getting quotes from different locksmiths and then decide, your locksmiths details can be easily found on yell.com or yellow pages directory

Hi. Would cost around $20-30 for a standard key in knob type lock. A deadlock can be anywhere from $30-100 depending on what type you want. To have it installed by a Locksmith would cost anywhere from $55-90 tops.