CARDIFF, UNITED KINGDOM - MARCH 18: A estate agent's sign is displayed outside a house for sale on March 18 2008 in Cardiff, Wales. House builders are being forced to make more and more attractive offers to tempt house buyers due the global credit crisis which is deepening still further with the collapse of US bank Bear Stearns. This has meant credit such as mortgages are becoming increasingly harder to obtain. Some UK lenders are only offering mortgages to first time buyers with deposits of 25 percent of the purchase price.