Transparency International said £180m worth of property has been placed under investigation - the tip of the iceberg.
Ex-Cabinet minister Lord Mandelson said he did not like the idea of 'clobbering people'.
General Election uncertainty weighs heavily on buyer demand says Rics.
In 2014, the average new Persimmon home cost £190,500.
Number of first time buyers rose 22% compared with 2013.
IBTimes UK news editor Lianna Brinded looks at the how UK house prices are set to change in 2015
British banks approved 20% fewer mortgages in November compared to the same month last year.
The National Housing Federation (NHF) said Brits are finding it hard to cope.
Tighter lending conditions are blamed for falling house prices.
Only 17% of Westminster homes coming on to the market in December have been sold, said online estate agents eMoov.
High end estate agents say luxury property sales to Russians have rocketed 10% over the year.
The scale of the infrastructure challenge for Britain is so great that George Osborne's planned investment is only the start
National Housing and Planning Advice Unit abolished in 2010 in quango bonfire.
First-time buyers will be offered the chance of a 20% discount on new builds.
Asking prices in Greater London have been falling since the summer.
Knight Frank said some 54% of 18 to 24 year olds said they would be happy to live in a studio flat.
However, property prices grew by 0.4% in November
Persimmon, Taylor Wimpey and Barratt Developments are trading to the upside.
Tenants' finances have improved but rent has also risen 1.5% over the last twelve months.
Nationwide said house prices rose 8.5% in the year to November
The FCA and BoE has sought to stop the rising cost of property through lending curbs
Rents across England and Wales up 1.5% over the last twelve months