The average home in the capital cost £510,000 in January – up 1.6 per cent from £502,000 in December, and back up towards the £514,000 peak seen in August 2014.
Over the past year, London prices rose 12.8 per cent while UK-wide prices rose by 8.3 per cent.
Both low interest rates and the change in pension rules are expected to keep pressure on the market.
“So-called ‘Granlords’ withdrawing their annuities to fund buy-to-let investments are another party competing for the same stock of housing,” said Richard Sexton from surveyors E.Surv.
“Potential buyers are coming in from all directions to buy into a constricted supply of property on the market, and time is ticking to build more homes.”