May also confirmed the loan of the Bayeux Tapestry from France, a historic work depicting the Norman conquest of England which she said would come to Britain in 2022 for the first time in over 900 years.
The two leaders, meeting for wide-ranging talks at the Sandhurst military academy near London, agreed that the UK will pay an extra 44.5 million pounds(50 million euros, $62 million) for fencing, CCTV and detection technology in Calais and other Channel ports.
While the two countries cooperate closely in numerous areas, including intelligence and defence, differences over migration have often strained ties.
The money is on top of more than 100 million pounds already paid by Britain, following a request by Macron to contribute more cash.
At a press conference, May said she was "honoured" by the loan of the Bayeux Tapestry and the French president added he hoped it would open "a new chapter" for cultural and scientific co-operation.
The loan has been met with opposition by French experts who have warned about the delicate state of the 70-metre (230 -foot) long embroidery.
The tapestry, which shows the English King Harold being killed by an arrow in the eye at the Battle of Hastings in 1066, is believed to have been created within years of the battle
The leaders capped the summit at an evening reception at London's Victoria and Albert Museum, where they spoke of celebrating the two countries' shared history and values.
Macron declared the day's work a "full roadmap for the coming years".
The UK-France summit came as Britain tries to strengthen bilateral ties before leaving the European Union in March 2019.
The French flag was raised over the military base and the French national anthem played out for the arrival of May and Macron, who were greeted by a guard honour and a flypast of two planes.
They earlier visited the Michelin-star Royal Oak pub in May's Maidenhead constituency, where they had a "convivial" lunch together according to a British source.
Macron also said that Britain could have "no differentiated access to financial services" if it decides to leave the European single market.
Otherwise, Britain would have to pay into the EU budget.
"There shall be no hypocrisy in this respect... otherwise we would destroy the single market," he said.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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