But Prime Minister Tony Blair said a change was unnecessary.
"What the Crown Prosecution Service and the police are saying is `we don't actually need to change the law, what we need is for people to understand they are perfectly entitled to defend themselves against burglars in their own home,'" he told GMTV television.
But the new London police chief, Sir Ian Blair, appeared to disagree.
"I'm not sure the wording does go far enough ..," he told BBC radio before he had seen the new guidelines.
"'Reasonableness' is quite a difficult concept at 4 o'clock in the morning in your kitchen ..," The Crown Prosecution Service issued the new guidelines to try to clarify the law after increased public concern.
Farmer Tony Martin was jailed for manslaughter after he shot dead a teenage burglar in his remote farm in 1999.
Two months ago, intruders killed a 49-year-old financier in his home off London's fashionable Kings Road and a few weeks earlier rockstar Ozzy Osbourne had fought with burglars at his mansion just outside the capital.