The figure would also mark the fifth successive quarter of growth – the longest period since before the financial crisis.
Figures for the fourth quarter of 2013 showed an increase of 0.7%, while the Bank of England has said it expects growth to hit 1% this quarter.
Earlier this month, the International Monetary fund said it expects the UK to be the G8’s best performing economy in 2014, wih overall growth of 2.9%.
A positive number today will lead to further calls for a rise in interest rates later this year, which currently stand at a historic low of 0.5%.