CODE OF PRACTICE ON Buildability
CODE OF PRACTICE
1 Scope 适用范围
2 Definitions 定义
3 Statutory Requirements 法规
4 Categories of Buildings 建筑类别
5 Buildable Design Score Requirements 评价要求
6 Submission Procedures for Buildable Design Score Requirements 可建造设计分数要求的提交程序
7 Constructability Score Requirements 施工能力的分数要求
8 Submission Procedures for Constructability Score Requirements 可施工性评分要求的提交程序
9 Other Requirements 其它要求
10 First Schedule 附表
A Buildable Design Appraisal System (BDAS) 可建性设计评估系统(BDAS)
B Constructability Appraisal System (CAS) 可建性评价系统(CAS)
Since 2001, BCA had implemented the buildability legislation for all building projects to raise productivity in the built environment sector and reduce its reliance on foreign workers. The mandatory requirements for adoption of buildable designs had also been progressively raised over the years. The legislation has had the effect of changing some of the design practices in the industry, for example, the switch to more flat plate designs, dry walls, precast construction and prefabrication, and adoption of higher repetition of grids, floor-to-floor heights and more repeated component sizes.
In 2011, BCA introduced the constructability requirements for builders to adopt more labourefficient technologies and methods to improve productivity during construction. This helps to ensure that productivity concepts initiated during the upstream design phase by architects and engineers would be implemented with labour-saving construction processes by builders during the downstream construction phase.
To accelerate the built environment sector’s productivity improvement, especially in view of the more aggressive reductions in foreign worker supply, BCA raised the minimum standards for Buildable Design Score and Constructability Score further in 2013. At the same time, the buildable design requirements were tightened to propel the industry towards adopting a greater degree of standardisation in building components and design parameters.
Going forward, there is a need to lift productivity onto a higher plane by getting the industry to design and construct more buildable buildings and to exploit more labour-efficient technologies and productive methods of construction. Thus, in 2014 and 2015, besides further raising the minimum scores, BCA has mandated the adoption of key productivity components including industry-wide standard dimensions and building components for specific types of development. In addition, specific productive technologies have also been stipulated as land sales conditions for developments sold under the Government Land Sales (GLS) Programme.
This helps to pave the way for the industry to adopt the Design for Manufacturing and Assembly (DfMA) approach, by moving as much construction work off-site to a controlled manufacturing environment as possible and minimising work on site.
While the industry has made good progress over the years, there is a need to build on the momentum and continue to strive for higher productivity improvement. As part of the larger drive towards wider adoption of prefabrication technologies along the DfMA continuum, the buildability legislative framework has been enhanced further to raise construction productivity.
This Code sets out the requirements of minimum Buildable Design Score, minimum Constructability Score and their submission procedures. It also sets out the method of determining the Buildable Design Score and the Constructability Score, as well as the requirements for the specific productive technologies stipulated for GLS sites which need to be fulfilled. Some amendments and revisions may be expected from time to time.
If you need clarification on any aspect of this Code of Practice, please contact the Building and Construction Authority, Singapore.
This Code sets out the requirements of minimum Buildable Design Score and minimum Constructability Score for buildings, the method for determining the Buildable Design Score and the Constructability Score as well as their submission procedures. It also sets out the requirements for the specific productive technologies which need to be complied with by developments built on Government Land Sales sites for which the technologies have been stipulated as land sales conditions.
For the purpose of this Code, the following definitions shall apply:
The extent to which the design of a building facilitates ease of construction as well as the extent to which the adoption of construction techniques and processes affects the productivity level of building works.
Buildable Design Score
The score for buildable design computed in accordance with the Buildable Design Appraisal System (BDAS) as set out in the Code of Practice.
Buildability Detailed Design and Implementation Plan
Documents including plans which describe and define the type, extent of use and details of the building systems,building components, buildable features and Design for Manufacturing and Assembly (DfMA) technologies to be implemented for the building works for the purpose of computing the Buildable Design Score.
The score for constructability computed in accordance with the Constructability Appraisal System (CAS) as set out in the Code of Practice.
Constructability Implementation Plan
Documents including plans which describe and define the type, extent of use and details of the construction techniques, processes, plant, equipment and innovative methods and systems to be implemented for the building works for the purpose of computing the Constructability Score.
Government Land Sales Programme
A programme under which State land for private sector development is sold via public tender by the Government or a statutory board acting as an agent for the State.
Gross Floor Area
The gross floor area is calculated using the definition by the Urban Redevelopment Authority (URA).
Labour Saving Index(LSI)
A value given to a particular building system which reflects the relative difference in site labour productivity associated with the various structural and wall systems.
In certain instances, the LSI could be further lowered to discourage the use of labour intensive elements or components. A LSI is also given for the use of prefabricated reinforcement/cages in cast in-situ components.
Minimum Buildable Design Score for Superstructure Works
The lowest Buildable Design Score allowed for the superstructure works under a particular category of development and gross floor area stipulated in this Code.
Minimum Buildable Design Score for Basement Works
The lowest Buildable Design Score allowed for the basement works (including first storey) under a particular category of development and gross floor area stipulated in this Code.
Minimum Constructability Score
The lowest Constructability Score allowed for the relevant gross floor area of the development stipulated in this Code.
Qualified Person (QP)
The Qualified Person shall be as defined in the Building Control Act, Chapter 29, Part I, Section 2.
Type of Use
This refers to the use of the building/development, e.g. residential use or commercial use.
Type of Building Work
This refers to new building work, repairs, alterations or additions to an existing building (whether carried out within or outside the existing building).
3 STATUTORY REQUIREMENTS
3.1 Act and Regulations
The following Act and Regulations have relevance:
a. The Building Control Act.
b. The Building Control Regulations.
c. The Building Control (Buildability and Productivity) Regulations.
3.2.1 It is the responsibility of the developers, architects, engineers, builders and others engaged in the design and construction of buildings to be conversant with the statutory requirements pertaining to the Buildability Framework.Designers and builders should familiarise themselves with the Buildable Design Appraisal System (BDAS) and Constructability Appraisal System(CAS) respectively to enable them to consider a wider range of construction systems, methods, technologies, materials and products to meet the requirement for minimum Buildable Design Score and Constructability Score.
3.2.2 The developer shall engage the appropriate Qualified Persons (QPs) to carry out buildable design. The QP for Architectural Works and the QP for Structural Works shall be responsible for ensuring that the Buildable Design Score requirement is met. Where applicable, the QPs shall also be responsible for ensuring that the mandatory buildable systems and standard dimensions/components as set out in Annex A – Section 2 are adopted for the building works; and that the high impact productive technologies imposed on developments under the Government Land Sales (GLS)Programme as set out in Annex A – Sections 3 to 6 are adopted and have met the minimum requirements. The QPs shall jointly declare the Buildable Design Score achieved. The QPs shall also jointly declare the Buildable Design Score achieved for the building works as completed (referred to as the record plans of Buildable Design Score).
3.2.3 The builder shall be responsible for ensuring that the Constructability Score requirement is met. The builder shall declare the Constructability Score achieved. The builder shall also declare on the Certificate of Compliance of Constructability Score.
4 CATEGORIES OF BUILDINGS
The various types of building development are categorised in Table A. Buildings listed under the First Schedule are exempted from both the buildable design and constructability requirements.
Table A Categories of Building
The above list shall not be exhaustive. The QP/builder is advised to seek clarification with BCA if his type of development is not stated in the above list.
5 BUILDABLE DESIGN SCORE REQUIREMENTS