Squatters in residential buildings in England and Wales are about to become criminals under a law that goes into effect this weekend. The law that takes effect Saturday allows police to evict those occupying buildings without the owner\'s permission, The Guardian reported. Squatters also face up to six months in prison and fines of up to 5,000 pounds (almost $8,000). The law does not apply to commercial property. Advocacy groups estimate as many as 20,000 people live in housing where they are not legal tenants. They warn the law will increase the number of people living on the streets. Housing Minister Grant Shapp said the law means the end of \"squatter\'s rights,\" which barred police from forcible entry to occupied buildings. \"Instead, from next week, we\'re tipping the scales of justice back in favor of the homeowner and making the law crystal clear: Entering a property with the intention of squatting will be a criminal offence,\" Shapp said. Alan, an art teacher, told The Guardian he moved into a London squat when his marriage ended and he was unable to find other housing. He shares a four-story building scheduled for demolition with 15 other people, and the residents pay for utilities. Another woman who lives in the building said the residents fixed leaks and repaired the plumbing. \"We want to improve the building so that we can have an agreement with the owners to stay. Unfortunately they won\'t talk to us,\" she said. While the Metropolitan Police would not say how or when the law will be enforced, groups advocating for squatters said notices have been pasted to doors warning occupants it is taking effect.