CAD Drafting, Shop Drawings and As-Built Documentation in Singapore
A practical Singapore guide to CAD drafting, coordinated shop drawings, revision control and as-built documentation for construction project teams.
Computer-Aided Design (CAD) remains central to construction documentation even on BIM-enabled projects. Consultants, contractors and specialist trades still rely on plans, sections, details, schematics, schedules and marked revisions. The important distinction is the purpose of each drawing: design information, coordination information, shop-drawing production and as-built records have different inputs, review paths and responsibilities.
Define the scope before production starts
Before drafting starts, confirm drawing numbers, title blocks, units, scales, layers, fonts, plotting rules, revision conventions, reference files and the source information that controls the drawing. Shop drawings also need current design documents, product information where applicable, coordinated routing or layouts and a clear understanding of which details are being developed for project-team review.
A practical delivery workflow
A controlled drawing workflow uses a current drawing register and identifiable source revisions. Drafting proceeds from the latest approved or instructed information, internal checks are completed, the issue is sent into the project’s review process and comments are incorporated with traceable revisions. As-built updates should be based on verified record information supplied by the responsible site or project parties, not assumptions made by the drafter.
Quality and coordination checks
Quality checks should cover dimensions, notes, references, layer consistency, title-block data, revision marks, plotting, cross-references and consistency between related plans, sections and details. On BIM-linked projects, drawing information should also remain consistent with the coordinated model where the model is the agreed source. Drafting accuracy does not itself verify engineering design or installed conditions.
Singapore project context and responsibilities
In Singapore, shop drawings usually sit within contractor, consultant and project approval processes. BIMProSG can produce and revise drawings from supplied information, but it does not claim that production support automatically makes a drawing approved for construction or statutorily endorsed. Formal design, review, approval, site verification and professional responsibilities remain with the appointed project parties.
Commercial and engagement considerations
Commercial scope should state the number and type of drawings, expected source quality, drawing standard, revision allowance, whether coordination/model references are included and the required native and plotted formats. Conversions from PDF or scans should identify whether geometry is being redrawn or whether design interpretation is also expected.