As Wembley is proving, new ideas come with a price - and a hefty one at that.

The estimated cost of the new Wembley Stadium has spiralled to an estimated �715m.

If talks between the Football Association and the government find a way to meet the costs, then the structure will become one of the most expensive venues in the world.

The proposed arena is expected to hold 90,000 spectators and will feature state-of-the-art facilties - a sliding roof, 23 escalators to replace the dilapidated steps and 2,000 toilets, which will help with the queues at half-time.

But why has the initial cost of �200m risen so dramatically?

Additional costs

According to Wembley National Stadium's communications manager Chris Palmer, the current figure being bandied about is a misleading one.

"People are assuming that the �660m is the cost of the stadium, whereas the cost of the actual stadium is just �326.5m," said Palmer.

"The �660m figure is the cost we show to the banks so that they know that we can finance that amount should we need to."

Of course, they may have to. Even though �326.5m will fund the cost of the arena, there are additional sums, such as the cost of buying the site - which will amount to �103m cash.

Then there is the sum of �17m in stamp duty.

So, the total amount is now at �446.5m - so far so good. But then there are the construction costs, like the labour and the fee architects HOK will require for designing the new arena.

Groundkeeping equipment needed to preserve the 'new' turf, the hire of new staff, plus costs to promote the new stadium along with a 200-bed Hilton hotel, two banqueting halls and a visitor attraction centre will take the sum nearer to the �660m figure.

So how do Wembley's rapidly-rising estimates compare to other recent stadium projects?

Here, BBC Sport Online breaks down the cost of living the high life: