Why did the Sydney Opera House cost more time and money than planned? I need to know why this happened.

I believe the major difficulty in building the opera house
was the fact that guidelines in terms of "design parameters" and total costs were not
established. There were a great many proposals set forth in the "competition" to find a
designer of an opera house that would house two halls: one for operatic performances and
another for symphony concerts. So the main requirement was not cost or design
limitations, but the end product. This never bodes well when fiscal concerns are to be
met: because in this case, they were never
presented.

The plan that was eventually adopted is said to
have been one that had been originally rejected. Jørn Utzon created a design that caused
a great deal of public interest and excitement. The design included elements never
attempted before (including the use of ceramic tiles for the "shell") which made its
construct "cost-prohibitive," and changes in the original design slowed down the
construction as well.

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Cost overruns contributed to populist criticism
and a change of government resulted in 1966 to Utzon’s resignation, street
demonstrations and professional
controversy.

A great deal of
the money needed was raised by "gambling:" a lottery was developed specifically to help
with the costs of the opera house. Over 105 million dollars was raised in this
way.