1

At first I wrote it as follows:

The number of houses in 2010 was twice as large as that in 2008.

But then I decided to shorten it like this:

The number of houses in 2010 was double that in 2008.

Is the second one true?

2

The use of "double" in this context is good. Here are some more examples from the wild:

The report finds that average broadband speeds in the UK now stand at 6.4Mbps, which is more than double that in 2008. BBC

Yorkshire Building Society found that 367,038 mortgages were issued to first-time buyers last year. That figure is more than double that in 2008 Independent

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