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Seven years ago when the plans for Tottenham Hotspur's new stadium began to get off the ground its cost was estimated at around £400m, yet the figure today stands at nearer £800m. What has caused such a steep rise in seven years?

Wembley Stadium endured an eight-year saga of rising costs which saw the FA's original £458m price end up nearer to £827m according to some reports when it was finally finished in 2007.

For Spurs, their own new London home has been hit by plenty of outside factors as they look to build one of the best football stadiums on the planet.

It's worth remembering that the club are not just looking to build a home for their Premier League side, but also a place the NFL can also call home, initially twice a season and potentially for a new London American football franchise.

The state-of-the-art retractable pitch, which will be housed underneath the south stand, is what convinced the NFL to sign their ten-year deal with Spurs and it won't come cheap as much of it involves cutting edge technology.

However, the full reasons for the drastic rise in the stadium costs have been revealed by one of the club's executive directors, Donna Cullen, in an email reply to one fan who was asking about the new £800m figure quoted in last week's meeting between the club and the Tottenham Hotspur Supporters' Trust.

"It's worth remembering that the original cost quoted for the stadium was some seven years ago. This new 'estimated' figure relates predominantly to the stadium with some elements of substructure for the other builds particularly the Tottenham Experience," the email, which was posted on www.skyscrapercity.com, read.

"Brexit has added a straight 20 per cent on costs for foreign goods due to the exchange rate, overtime working and increased construction costs similarly. Revised basement works also added to the cost.

"We are constantly managing costs and will continue to do so throughout the process along with funding plans to ensure the viability of the scheme."

A recent leaked email from Daniel Levy showed the Spurs chairman's frustrations at the lack of support from senior figures at City Hall and Haringey council and public sector in general with regards to the new stadium.

The project, described by the chairman as "the most complex private build in Europe at this time", is going to transform Tottenham, an area in desperate need of regeneration, and with costs seemingly rising constantly the club will need all the help it can get.