When do you need a production drawing?
A production drawing is a detailed technical drawing that records all specifications of a part or building element so precisely that it can go straight into production. Contractors, suppliers and prefab manufacturers need production drawings for parts such as steel window frames, prefab concrete elements, wooden dormers, staircases or built-in furniture. Without a production drawing, the factory or workshop cannot order materials, cannot program CNC machines and cannot guarantee quality.
Common situations in which a production drawing is needed:
- Prefab dormers or roof elements that are manufactured in a factory and assembled on site.
- Custom steel or aluminium window frames for commercial or residential property.
- Bespoke staircases, balustrades or handrails for homes or public buildings.
- Built-in furniture such as kitchens, wall units or custom bathroom cabinets.
What does a production drawing contain?
A complete production drawing contains exact dimensions down to the millimetre, tolerances that indicate which deviation is acceptable, material specifications and all fasteners such as screws, bolts, glue or weld points. Connections between parts are worked out in detail, often at a scale of 1:10, 1:5 or 1:1 for small details. The drawing also lists any surface treatments: powder coating in a specific RAL colour, anodising, stain or varnish.
For modern production, the drawing often also includes fabrication instructions: which machine processes which part, in what order the operations take place and possibly CNC codings or parts lists. Delivery takes place in PDF for human review and in DWG or DXF for direct connection to CNC machines and fabrication software.
Tolerances, materials and fabrication
The difference between a good and a bad production drawing lies in the tolerances. A dimension of 1,000 mm without tolerance is useless to a steel manufacturer: a part with a +0/-2 mm tolerance has a different price and quality than a part with a ±0.1 mm tolerance. We match tolerances to the fabrication method and the intended use, so that the part does not become unnecessarily expensive but is still functionally correct.
Materials are specified unambiguously, for example 'S235 steel' for structural steel or 'meranti hardwood' for window frame timber. For connections we state the class and size, such as 'M10 hex socket bolt 8.8'. The more precise the specification, the less discussion arises between designer, manufacturer and contractor.
What does a production drawing cost?
A production drawing is available from €100 per part. The final price depends on the number of parts, the complexity and the level of detail. A standard prefab dormer for which a drawing package already exists can be delivered faster than a unique steel window frame with several moving parts or a staircase with unusual geometry.
For manufacturers with a fixed product line, we often create a standard set of production drawings that can be reused across multiple projects. Per project, only the deviating parameters are then adjusted. This saves considerably on drawing work and turnaround time across multiple orders.
Difference from working and construction drawings
A construction drawing shows the complete project for the municipality and the contractor: floor plans, elevations, sections. A working drawing develops the structural side for the contractor, with connections between building components and installations. A production drawing focuses on a single part with all the fabrication information. Where a working drawing positions a staircase roughly within the home, the production drawing tells you exactly which profiles, welds, fasteners and surface treatment that staircase receives.
For projects involving both structural and production work, we deliver both drawings coordinated with each other. The construction drawing serves as an overview; the production drawing as a fabrication instruction. During the intake we assess what level of detail your project requires.
