Ukip’s only MP said the Conservative leader had been “absolutely fantastic” with her vision for removing Britain from the Brussels bloc.
Despite defecting from the Tories in 2014 – the Eurosceptic was more than happy to express gratitude towards Mrs May’s 12-point Brexit plan.
Last month the Prime Minister promised a clean break from the EU to build a “Global Britain” free to forge trading links around the world as she laid out her ambitious departure deal.
Theresa May has won the praise of Ukip's only MP
It’s absolutely fantastic on Brexit – it’s very encouraging
With her self-imposed Article 50 deadline looming next month, Mr Carswell defended the Prime Minister for not beginning talks sooner.
“So far 10/10 – I think it’s really encouraging what Theresa May said a couple of weeks ago,” he told Express.co.uk.
While supporting the Tory leader, the Clacton MP made a dig at the party’s predecessor David Cameron.
Douglas Carswell said the prime minister's Brexit vision was "fantastic"
“She gave a couple of great speeches, in fact in the space of 10 days she probably said more than David Cameron did in 10 years,” he continued.
“It’s absolutely fantastic on Brexit – it’s very encouraging.”
On Wednesday MPs overwhelmingly backed a Government bill to allow the prime minister to begin official divorce talks with the EU.
Theresa May is on course to trigger Article 50 by the end of March
The legislation, which now moves to the House of Lords, was backed in the Commons 494 votes to 122 in its final reading.
Mr Carswell said the bill’s passing was “great news for democracy” – assuring Brexit was “not something to be feared”.
“It’s great for those of us who want to be able to corporate with European ways that the EU has prevented us from cooperating,” he said.
Theresa May's Brexit plan
Mon, January 16, 2017
It's finally here!
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Continued cooperation with the EU to tackle terrorism and international crime.
Unelected Lords will begin scrutinising the 137-word legislation when they return from recess on February 20.
It will be their first opportunity to flag up any concerns and identify areas where they think changes are needed.
Mr Carswell warned peers would be replaced if they tried to thwart the will of the British people and reject the bill.
“Even if the House of Lords decided to throw a wobbly, it's possible to call a general election and replace the House of Lords fairly straightforwardly.
"If we could leave the European Union and make sure those who make our laws in parliament live under the law then that would be the icing on the cake wouldn't it?"