What is the building at the centre of the blaze?
The One Station Hill Complex was a landmark building that was due to open next year containing 15 floors of workspace and a fitness club.
This is not the first time the landmark building has caught fire, as it was the centre of a blaze in July last year.
Office workers at Thames Tower, which is very close to the construction site on fire, saw the flames first hand and were asked to evacuated around 11.40am.
Statement issued on behalf of Station Hill
Redwood Consulting, on behalf of Station Hill, said: 'We activated our fire emergency plans immediately, the emergency services were notified and are currently on site.
'The safety of those on site and the wider public is always our first priority, and the site has been evacuated as a result.
'As soon as we have more information we will provide an update.'
Reading fire: MailOnline will give you the latest updates
An inerno broke out earlier at a high-rise building in Reading with a man stranded at the top of the One Station Hill development when it caught fire.
The blaze broke out at 11.38am today near the town train station.
Follow MailOnline's live blog for the latest updates.