Category: Design
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Shop drawings are prepared by the contractor or supplier from the construction drawings and show how items will actually be fabricated and installed: piece sizes, fixing details, element reinforcement and service routes. They go to the consultant for approval before work starts.
Why it matters on a project
They are the last point where clashes between disciplines are caught on paper rather than in concrete. Anything built before its shop drawing is approved is built at the contractor's risk.
Measurement and pricing
Usually priced per sheet or per square metre depending on the element, such as rebar, steelwork or ceilings.
Common mistake
Submitting a shop drawing that is just a copy of the construction drawing with no fabrication detail, so it is rejected and approval time is lost.
Frequently asked questions
Who prepares shop drawings?
The contractor, supplier or specialist subcontractor prepares them, and the consultant approves them before fabrication or installation.
How long does shop drawing approval take?
The contract sets the period, often 7 to 14 days per submission, so it is planned into the programme ahead of the work.
Related terms
- Construction drawingsDetailed drawings used to build the work on site after design approval, including dimensions, levels and details.
- Material submittalA request to approve a material or product with manufacturer data and samples before supply.
- Bar bending schedule (BBS)A schedule listing the diameter, length, shape and number of reinforcement bars per element.
- RFI (request for information)A formal request from the contractor to clarify a gap or conflict in drawings or specifications before execution.
- As-built drawingsDrawings updated to match what was actually built, handed over in the close-out file.
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