According to some estimates the bill is between £24m-£30million – and the taxpayer is footing it.
With other security and preparations the total bill is believed to be around £20million.
Armed police patrol the ground of Windsor Castle as a rehearsal of Harry and Meghan’s wedding takes place inside
Police officers patrol close to Windsor Castle ahead of the royal wedding of Prince Harry to Suits actress Meghan Markle
Hundreds of armed officers are expected to descend on Windsor this weekend as an estimated 100,000 arrive to catch a glimpse of the royals
However, Harry’s big day is believed to be costing much more.
Wedding planning service Bridebook told The Independent it could cost as much as £32m to ensure the event remains safe.
The amount is more than double the security needed for the 1981 wedding between Prince Charles and Diana Spencer which was estimated to have cost £4m – which equates to around £12m today.
Extra police from around Britain are being called upon to help ensure the event goes off without a hitch, as crowds will fill Windsor to catch a glimpse of the royals.
Thames Valley Police are preparing for around 100,000 spectators.
That will make it one of the force’s largest ever security operations, which will require reinforcements from other forces.
Since Prince William’s wedding the UK has experienced a surge in terror threats, meaning the cost of Harry’s nuptials outside of the city will be much higher.
The couple’s decision to invite more than 2,000 members of the public to attend celebrations at Windsor Castle has also increased security costs.
Hundreds of police officers will patrol the streets as the security cost of the royal wedding is tipped to reach as much as £30million
The police will patrol the streets all weekend as fans gather in Windsor for the royal wedding. Prince Harry will wed Meghan Markle in St George’s Chapel
Taxpayers will foot the security bill for the royal nuptials while the Palace will pay for the rest of the big day
A police briefing takes place on the streets of Windsor as the huge security mission gets underway. Armed police will be stationed for miles around the event
The entire bill is not being caught by the public, however, since the Queen revealed said she and the rest of the royal family will pay for the traditional wedding costs like the ceremony, flowers, music and the reception – but security is likely to be paid for by the taxpayer.
Cash can also be drawn from the public purse.
Duncan Simpson, policy analyst at the TaxPayers’ Alliance told The Independent efforts should be being