Private rents rose by 0.2% month-on-month in April to reach £736 on average - and for first time since November 2011 rents were up year-on-year across the whole country - according to LSL Property Services, which owns chains Your Move and Reeds Rains.
Rents started edging back up again month-on-month in March, following a period of falls amid the seasonal winter slowdown. The further push up in April means average rents have returned to levels not seen since November last year and they are 3.9% higher typically than a year ago.
London saw the biggest annual increase in rents, with a 7.6% rise pushing average rents to £1,110 a month. Wales recorded the second highest spike, with a 5% rise taking rents to £566 typically.
The South West, which was the only region to see rents fall year-on-year in March, recorded a 0.5% annual increase in April, putting average rents at £634. On a monthly basis, rents rose in eight out of 10 regions, with the East Midlands recording the strongest increase at 0.6%, to reach around £552.
Lenders have reported seeing increased numbers of first-time buyers taking out loans amid better access to mortgages. However, David Newnes, director of LSL Property Services, said that a lack of potential homes to choose from generally is helping to maintain the upward pressure on rents.
He said: "Landlords across the UK have increased the stock of rental properties by around 10% since 2008 - but the more fundamental squeeze is still coming from a lack of new building."
A Department for Communities and Local Government spokesman said: "Official Valuation Office Agency figures show that median rents were unchanged nationally over the past year and Rightmove are forecasting that two thirds of landlords are planning to freeze their rents in 2013. However this Government is determined to boost the poor housing supply numbers we inherited.
"In the private rented sector we have a £1 billion Build to Rent fund in place, with up to 45 important schemes already identified. This is in addition to guarantees of up to £10 billion to help grow the number of homes in both the privately rented sector and the affordable homes sector."