The UK's economy grew by just 0.1% in the three months to November, according to the Office for National Statistics.
Growth was slightly stronger in September and October than previously thought, but fell 0.3% in November, dragging down the three-month figure.
The ONS said growth in the economy year-on-year was at its lowest since the spring of 2012.
Growth in construction was offset by a weakening service sector, while manufacturing was "lacklustre".
Read MoreThe pound has risen sharply over the past month as currency traders in the City of London bet that an election victory for Boris Johnson’s Conservatives would lift some of the intense political uncertainty facing Britain. Sterling jumped by more than two cents against the US dollar and the euro after exit polls indicated a Tory majority.
Read MoreThe British economy is on track for the weakest year outside a recession since the second world war, as political turmoil and Brexit uncertainty dragged down growth, a Guardian analysis reveals.
At the end of a turbulent year and following Boris Johnson’s election victory, surveys of business activity suggest economic growth in the final three months of 2019 has essentially stalled. The jobs market is showing signs of stress and public borrowing is steadily rising again after a decade of improvement.
Read MoreWhat happens now?
Johnson was hoping to get his deal through on Saturday, when lawmakers were gearing up to vote on the deal in a rare weekend sitting. But that did not happen, as lawmakers instead voted on an amendment that withholds their support for any deal until separate legislation is passed that ensures that any deal must be implemented in U.K. law.
