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18th Edition Wiring Regulations

The 18th Edition is BS 7671, the UK wiring rulebook. Buy the current amendment.

Updated . Edited by: Ilyass Ben Hakim.

Where to buy

The IET Bookshop sells the printed book and a digital edition. NICEIC, electrical wholesalers and book retailers also stock it.

Professional insight

Electricians buy the current amendment only. Courses, exams and certificates all reference one specific version.

  • Match the amendment your exam or course names.
  • Check for corrigenda published after your print date.
  • The On-Site Guide is a companion, not a substitute.
  • Digital access updates when new amendments land.

Check the label

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18th Edition amendments

Status per the IET BS 7671 page
VersionStatus
BS 7671:2018 (original)Superseded
BS 7671:2018+A1:2020Superseded
BS 7671:2018+A2:2022Withdrawn 15 October 2026
BS 7671:2018+A3:2024Superseded by A4
BS 7671:2018+A4:2026Current edition

Before you buy

Second hand copies are cheap. Older amendments can fail you in an exam or audit.

City and Guilds 2382 and similar courses state the required version. Check your joining letter.

Red flags

  • PDF copies sold on auction sites.
  • Listings that do not name the amendment.
  • Prices far below the IET list price for a new book.
  • Sellers not listed as IET trusted resellers.

Terms to know

What is the 18th Edition?
The common name for BS 7671:2018, the UK wiring regulations.
What is an amendment?
An official update. Each one replaces parts of the previous text.
What is the On-Site Guide?
A shorter IET guide for common installations up to 100 A.

Common questions

Is the 18th Edition a law?
It is a national standard, not a statute. Building rules often rely on it.
Do I need a new book for each amendment?
Usually yes. Exams and certificates reference the current version.
Is there a digital version?
Yes. The IET offers digital access to BS 7671 and its guidance.