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Quality and Certification, CONQUAS

Frequently Asked Questions

  1. What is the purpose of CONQUAS?
  2. What does CONQUAS cover in a project?
  3. What type of projects does CONQUAS cover?
  4. Does CONQUAS check all the units in a residential building project?
  5. How do I know the CONQUAS score for my project?
  6. Is there any portal that allows me to search and compare CONQUAS scores and Quality Mark ratings by properties, developers or contractors?
  7. Is it possible for a project's CONQUAS score to be lower than another that has cheaper materials?
  8. Where can I find out more about CONQUAS workmanship standards?
  9. Does CONQUAS cover design and materials specification?
  10. Does CONQUAS cover future defects?
  11. How are projects assessed?
  12. When are the projects assessed?
  13. Who are the assessors?
  14. How is the CONQUAS score derived?
  15. What does the CONQUAS score mean?
  16. Why are developers and contractors concerned with CONQUAS scores?
  17. What are the CONQUAS scores for private residential buildings?

  1. What is the purpose of CONQUAS?

    CONQUAS was designed to:

    1. Standardise quality assessment to benchmark quality of construction projects.
    2. Measure quality of constructed works against workmanship standards and specification.
    3. Improve the quality standards of the Singapore 's construction industry.

  2. What does CONQUAS cover in a project?

    CONQUAS assesses the quality of workmanship in:

    1. Structural works - this covers the structural integrity and safety of the building to safeguard the interest of the building occupants.
    2. Architectural works - this covers the aesthetics of the building in the workmanship quality of the finishes and components. This is the part where the quality and standard of workmanship are most visible.
    3. Mechanical & Electrical (M & E) works - this concerns the performance of selected mechanical and electrical services and installations for the comfort of and use by the building occupants.

  3. What type of projects does CONQUAS cover?

    All new building projects e.g. commercial, residential, industrial, institutional, can be assessed under CONQUAS.

    CONQUAS assessment is compulsory for all public sector building projects with contract sum above $5 million under the Bonus Scheme for Construction Quality (BSCQ) and private projects with CONQUAS requirement under URA/SLA/HDB/JTC land sale agreement. It is voluntary for all other private sector building projects.


  4. Does CONQUAS check all the units in a residential building project?

    CONQUAS scoring is based on a sampling approach. On average, one in every four units is assessed.


  5. How do I know the CONQUAS score for my project?

    You can search here for the list of CONQUAS projects and their scores.


  6. Is there any portal that allows me to search and compare CONQUAS scores and Quality Mark ratings by properties, developers or contractors?

    The information on this webpage provides a platform for homebuyers to make a more informed decision when buying a home. Search and compare CONQUAS/Quality Mark performances of housing developments, developers and contractors in Singapore which reflects their workmanship quality standard.

    The Construction Quality Assessment System (CONQUAS) was designed to standardise quality assessment of workmanship in structural works, architectural works and mechanical and electrical works, by sampling.

    The BCA Quality Mark scheme assesses internal finishes in every newly completed housing unit of the project. In view of the more thorough assessment of finishes, homeowners experienced a much lower rate of defects in Quality Mark-assessed projects, according to an independent survey conducted by J.D. Power* in 2015.

    Click here to search and compare CONQUAS scores and Quality Mark ratings.

    *A survey on workmanship quality of Quality Mark vs non-Quality Mark residential properties was conducted by global market research consultant, J.D. Power in 2015.


  7. Is it possible for a project's CONQUAS score to be lower than another that has cheaper materials?

    CONQUAS is a measure of workmanship quality. The quality of design and material used are not assessed under CONQUAS.

    Hence using more expensive materials does not necessarily result in higher CONQUAS score if the workmanship is poor.


  8. Where can I find out more about CONQUAS workmanship standards?

    The CONQUAS workmanship standards are mentioned in the CONQUAS manual. To find out more, you may visit BCA web site or down load a copy of the manual here.


  9. Does CONQUAS cover design and materials specification?

    CONQUAS is primarily based on workmanship standards achieved and it does not cover design and materials specification.

    For example, CONQUAS does not assess design inadequacies like poor ventilation, narrow corridor or subjective issues like building aesthetics or architectural features.

    In addition, it does not verify whether the materials used are in accordance to the specification.


  10. Does CONQUAS cover future defects?

    CONQUAS assesses workmanship of the project upon completion. It does not cover latent defects that may appear after handing over.

    Such defects cannot be foreseen or visible during CONQUAS assessment.


  11. How are projects assessed?

    CONQUAS sets the standard to be met for various aspects of the construction works. Points are awarded for works that meet the standard.

    CONQUAS is based on a 'first time right' inspection approach. This means there is no re-assessment after the initial assessment. Any repair or rectification works done after assessment will be disregarded in computing the CONQUAS score.


  12. When are the projects assessed?

    Assessments are carried out throughout the various construction stages as the project progresses. Architectural and external works are assessed at or close to the completion of project prior to handover.


  13. Who are the assessors?

    All CONQUAS assessments are carried out by assessors from the Quality & Certification Department of Building and Construction Authority.


  14. How is the CONQUAS score derived?

    Points are awarded for works that meet the standard. Upon completion of all the assessments for a project, raw scores attained for structural, architectural and Mechanical & Electrical (M&E) works are weighted according to their project types and summed up to give a total quality score called the CONQUAS score.


  15. What does the CONQUAS score mean?

    A high CONQUAS score means a building with good quality workmanship.

    A CONQUAS score of 80 means 80% of the items checked for workmanship quality met the CONQUAS standards. A building that achieves a higher CONQUAS score is better constructed, in terms of workmanship quality, than a building with a lower CONQUAS score.


  16. Why are developers and contractors concerned with CONQUAS scores?

    Developers are increasingly using CONQUAS as a measure of quality to promote and market their developments.

    For instance, it is common for developers to specify target CONQUAS scores in their construction contracts for their contractors to achieve. There may be incentives e.g. bonus payments, or disincentives e.g. discounts, tied to such achievement.

    CONQUAS scores may also be used by developers to select contractors who are able to deliver quality projects.


  17. What are the CONQUAS scores for private residential buildings?

    You can visit BCA website to check the list of CONQUAS projects and their scores.