UK engineering and construction drawings are governed by a set of national and international standards that define how drawings should be formatted, what information they should contain, and what symbols and conventions should be used.

What is BS 8888?

BS 8888 is the British Standard for Technical Product Documentation and Specification. It defines the rules and conventions for technical drawing production in the UK, covering drawing sheet sizes, title blocks, line types, dimensioning conventions, tolerancing, surface finish notation, and geometric dimensioning and tolerancing.

BS 8888 aligns with the ISO 128 series of international drawing standards and is the primary reference standard for engineering drawings in UK manufacturing, product design, and mechanical engineering.

Drawing standards for construction

Construction drawings in the UK follow a combination of British Standards, industry guidance, and project-specific conventions. Key references include BS EN ISO 128 for general drawing principles, NBS drawing conventions for architectural work, BS 1192 and ISO 19650 for BIM and drawing management, and client-specific drawing production information documents on larger projects.

Electrical drawing standards

Electrical drawings in the UK follow BS EN 60617, which defines graphical symbols for diagrams covering electrical and electronic engineering. For wiring diagrams and installation drawings, the IET Wiring Regulations (BS 7671) inform the drawing conventions. Fire alarm system drawings follow BS 5839.

P&ID drawing standards

P&ID drawings follow ISA 5.1 published by the International Society of Automation, and BS EN ISO 10628 for flow diagrams for process plants. Most operators also have company-specific standards that supplement these international standards.

BIM and drawing management standards

BIM projects in the UK are governed by ISO 19650, which sets out how information should be managed, exchanged, and archived on BIM projects, including drawing naming conventions, revision management, and common data environment requirements.

How Outsource CAD applies drawing standards

Outsource CAD works to client-specified drawing standards on every project. We are familiar with the key UK and international standards referenced above and can work to your specific drawing production information. Contact us to discuss your drawing standard requirements.