to maintain weight  but build muscle how much protien is needed weighing at 69kg cuz i was told that i need 0.5 * lbs of bodyweight is this true or what

cheers jet li

Maintain weight? but build muscle?  

mu mu mu why would you want to do that ? Muscle.. weighs more then fat.. so you will put on weight..

But you wont be fatter..but leaner muscle..

trying to maintain weight you will be going round in a endless circle

What are your goals with training if not to add size to your muscles and why post on a bodybuilding forum if that is not your intension to improve your physique by adding lean mass to your frame????
Sorry but i just dont get this.

you want to stay the same weight but build muscle?? unless you lose a ruck of fat whilse you are adding muscle thats the only way i can think of doing it, but with a bodyweight of ten stone i doubt very much you have any fat on you!! just build some muscle and forget all about being ten stone

so it a pound of bodyweight for a gram of protien

for a natural trainer yes mate

Muscle has mass and hence building muscle will increase your bodyweight - so you cannot maintain your bodyweight while building new muscle.