SINGAPORE, July 6 -- Boutique private residential developments with fewer than 50 units are significantly more likely to register poor construction workmanship compared with larger projects, according to new data from the Building and Construction Authority (BCA).

The Straits Times reported that small condominiums made up over 58 per cent of private residential projects that received low band ratings under the Construction Quality Assessment System (Conquas) over the past six years. Of 167 projects assessed, 48 were rated in bands 4 to 6 - the lowest tiers - and 28 of these were boutique developments.

Conquas evaluates workmanship and major defects such as water seepage, cracked tiles and broken fittings. BCA also assigns band ratings t...