NEW firms will be banned from managing Housing Authority estates in a package of measures designed to ensure quality service to tenants. Subcontracting of management jobs will also be outlawed. The authority is contracting out estate management to private firms to cut costs but most tenants are not satisfied with the service received. In a paper to the Legco housing panel, the authority said companies registered for less than two years would not be considered. The move is aimed at preventing blacklisted companies from re-registering under different names despite being struck off. The authority said specific terms would be added to contracts to ban subcontracting of jobs. The number of estates a firm could manage would also be specified.