think the last time a roof on Westpac was discussed (years ago) the cost was ridiculous - from memory I remember a figure of 30+ mill
http://www.stuff.co.nz/dominion-post/news/7189987/A-new-look-for-stadium-but-no-roof
$80m figure mentioned for a roof.
Yep, because they opted for the cheaper build materials instead of allowing a roof to be added later.
There are some Interesting documents on the web for the stadium that can be found via Google.
I found this http://westpacstadium.co.nz/assets/Documents/Staying-on-top-of-our-game.pdf
Westpac Stadium – built to a tight budget
The Westpac Stadium was designed in 1996–1997 to standards
that existed at the time and to budgets that focused on minimising
the price, as the total cost was the ultimate barrier to the project
proceeding.
The outcome was the best stadium in New Zealand and new
benchmarks for comfort, entertainment, and technology to enhance
a stadium experience. But that was then

Also this:

$60M for one stand in Christchurch, and we're talking about building a stadium for $48M.


