Edinburgh’s next tram extension could cost up to £2.9 billion, up from an estimate of £2bn early last year.

A range of costs released ahead of a consultation on the project, which went live on Monday evening, put the price between £2bn and £2.9bn depending on which route the trams take.

The tram extension is set to see a new line built between Granton and the Edinburgh BioQuarter, near the Royal Infirmary.

It has been planned in some form since the early 2000s, when conversations about a tram network for Edinburgh started in earnest.

And legislative consent for the line has been on the books since 2006, enabled by the same law that gave the green light to the current tram line.

The full £2.9bn cost would come if a more expensive routing is taken to the northwest of the city, and i

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