Info needed on Capital Gains tax

Hi,

I have sold plot in 2006 for which capital gains were around 5 lakhs. This was used to purchase a plot and small house was constructed within a period of 1 year. However i didn't make any declarations in the income tax assessments during the subsequent years. Now its three years since i have constructed the house. Can i sell the house now. and what will be the tax implications?

Thanks & Regards,