The buildability legislation was implemented in 2001 to raise productivity in the built environment sector and reduce its reliance on site workers. Projects with a Gross Floor Area (GFA) of 2,000 m2 and above are required to comply with a minimum Buildable Design Score.
In addition to designers delivering more buildable designs upstream, builders must also play their part in adopting more labour-saving construction methods/technologies downstream. As such, with effect from 15 July 2011, builders of building projects with GFA of 5,000 m2 and above are required to meet a minimum Constructability Score.
Requirements for Buildable Design Score
The Buildable Design Score measures the potential impact of a building design on labour usage. It facilitates the adoption of less labour intensive construction methods and promotes greater use of prefabricated, modular and standardised building components.
To accelerate the pace of buildable design adoption, the mandatory minimum requirements for buildable designs have been progressively raised over the years. Refer to the Code of Practice on Buildable Design/Buildability for the minimum Buildable Design Score required for your project.
Requirements for Constructability Score
The Constructability Score measures the adoption level of labour-efficient construction methods and construction processes, such as system formwork and climbable scaffolding.
As with the Buildable Design Scores, the minimum Constructability Score requirements have also been raised over the years. Refer to the Code of Practice on Buildable Design/Buildability for the minimum Constructability Score required for your project.
Enhanced Buildability Framework
In May 2017, the buildability framework was revised to place greater emphasis on productive technologies along the Design for Manufacturing and Assembly (DfMA) continuum to raise construction productivity.
Together with other levers, such as public sector taking the lead to adopt DfMA technologies in their projects and requiring the adoption of specific productive technologies e.g. Prefabricated Bathroom Units (PBU), Prefabricated Prefinished Volumetric Construction (PPVC) for selected sites under the Government Land Sales (GLS) Programme, the industry has progressively built up capacity and capability in DfMA. However, more needs to be done to increase the adoption of DfMA. Thus, on 15 December 2019, BCA enhanced the buildability framework to:
- Exempt projects with Gross Floor Area (GFA) below 5,000m2 (up from 2,000m2 previously);
- Increase the minimum Buildable Design Score (B-Score) for larger Residential Non-Landed (RNL) projects with GFA ≥ 25,000m2; and
- Allow outcome-based solutions as an alternative to meeting the increased minimum B-Score for RNL projects.
The above changes were announced in the Circular on Amendments to Building Control (Buildability and Productivity) Regulations 2011 and revisions to the Code of Practice on Buildability issued on 16 November 2019.
For more details on the changes in the Building Control (Buildability and Productivity) Regulations and the Code of Practice on Buildability, 2017 Edition, please refer to the following: