It depends on the amount of pension and the house cost which that pensioner wants to build. If he got enough money in pension and he can build a normal house with 3 bedrooms then I think that money is enough to build 3 rooms house. But of the pension money is not enough even to build a normal price house then it's difficult.Their are countries that pays their retirees considerable amount of salary as a reward for the years dedicated during their active service career. While some countries pay their retirees less salary after bowing out of service.
Do you think that the salaries they pay this pensioners will be enough for them to build a 3 bed room flat apartment well furnished??