Her party gained 558 seats and seized control of 11 councils in the best local election performance by a governing party in 40 years, with the gains mostly coming at the expense of opposition Labour Party and far-right UK Independence Party (UKIP), which lost all of its 145 local authority seats.
"I will not take anything for granted and neither will the team I lead, because there is too much at stake," she said.
Labour leader Jeremy Corbyn described the local election results, which marked massive losses for the party of 320 seats, as "mixed", and insisted his party was "closing the gap" on the Conservatives.
"We have five weeks to win the general election so we can fundamentally transform Britain for the many, not the few. We know this is no small task, it is a challenge on a historic scale. But we, the whole Labour movement and the British people, can't afford not to seize our moment," he said in a statement.
This would not translate into a landslide victory for May but a decisive victory for the Tories looks guaranteed, with an estimated 100-seat majority for the ruling party.
Much of the Conservative Party success has been attributed to the UKIP vote switching en masse to the Tories as the anti-EU and anti-immigration party suffered a complete wipe-out in Thursday's polls.
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