Design and Material Selection for Quality — Volume 1

The Building and Construction Authority (BCA) launched Design and Material Selection for Quality — Volume 1 in 2008 as a Good Industry Practices guide. The guide presents buildable and constructible design approaches observed in projects with high CONQUAS and Quality Mark scores, linking early design and material choices to workmanship quality rather than treating defects as only an installation-stage problem (BCA Volume 1 guide, accessed 2 September 2026).

Buildability and constructability

The guide's scope begins with an overview of buildable design and quality, then examines how layouts and shapes influence constructability. Its underlying concern is the interface between design intent and the conditions in which Singapore projects are actually built: work sequencing, available skills, site constraints, weather exposure and coordination between trades can all affect the quality that reaches the finished building (BCA Volume 1 guide, accessed 2 September 2026). A visually attractive design is therefore not automatically a buildable or consistently executable design.

Structural and architectural components

Volume 1 covers quality issues in conventional methods and materials, then discusses structural elements such as steel structures and precast concrete elements. Its architectural coverage includes prefabricated bathrooms, drywall partitions, timber doors, cabinets and other components. These examples illustrate a recurring strategy: move suitable work into controlled factory conditions, standardise interfaces and reduce unnecessary site operations where this improves consistency, productivity or tolerance control (BCA Volume 1 guide, accessed 2 September 2026).

Adjoining trades and material choices

The guide also addresses design and detailing at adjoining locations and trades, including architectural finishes and embedded or concealed services. Material selection is not presented as a one-dimensional search for the cheapest product: the choice should be considered alongside function, appearance, installation effort, maintainability, durability and whole-life consequences. Interfaces between components can be as important as the components themselves, because poor coordination can create rework, inaccessible services or workmanship defects (BCA Volume 1 guide, accessed 2 September 2026).

How to use the guide today

Volume 1 is a foundational good-practice reference, not a current statutory code or a universal design prescription. BCA's current construction-quality resources separately identify CONQUAS as a national system for assessing workmanship quality and publish newer or material-specific guides. Practitioners should therefore use Volume 1 to structure early design and coordination decisions, then check current legislation, standards, project specifications, manufacturer's instructions and professional advice for the particular project (BCA Construction Quality, accessed 2 September 2026).