The prevalence of illegal structures at residential Hong Kong properties has long been identified as a problem. But it has persisted. The past focus has been on village houses and urban dwellings. Now, attention has turned to luxury detached homes. Scrutiny of these desirable houses, worth tens of millions of Hong Kong dollars, is long overdue.

A record rainstorm in September caused a landslide at the exclusive Redhill Peninsula, on the coast in Tai Tam, revealing what appeared to be extensive unauthorised additions, including swimming pools and basements. The controversy highlighted the potential safety risks posed by such works. Subsequent inquiries found 69 out of 85 houses there were suspected to have unapproved additions. A Post investigation into three luxury estates, in Kowloon Peak, Tai Po and Tai Tam confirms the scale of the problem.

Drone footage of the properties was compared to records on the Lands Department database. A staggering 74 per cent were found to be suspected of occupying government land without approval and 90 per cent appear to have unauthorised structures. During the investigation, checks were made to see whether owners had applied for or been granted permission by the authorities to make the alterations. The Post also gave the owners an opportunity to explain. Some of the properties appear to have added basements, many had extended their gardens – some onto government-owned slopes. The authorities must follow up. Chief Executive John Lee Ka-chiu responded yesterday by promising to crack down on illegal structures, prioritising those posing the biggest safety risks.

Post uncovers extent of unauthorised structures at luxury Hong Kong estates

Officials began targeting luxury coastal estates after the Redhill Peninsula scandal. They say investigations will continue and appropriate action will be taken. But there also is a need for systemic changes. Amendments to the Buildings Ordinance are expected this year. Wealthy property owners have been able to take advantage of lax enforcement and insufficient penalties. The vast profits to be made by enhancing their homes greatly outweighs the risks. Building laws must be tightened, the system for prosecutions streamlined, penalties raised and steps taken to ensure owners cannot bypass the rules. A much greater deterrent is required. The role played by some members of the construction industry in developing structures and advising owners how to evade consequences also deserves attention.