NEC3 and NEC4 Compared

By: Robert Alan Gerrard

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eBook | 28 November 2025

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NEC3 and NEC4 Compared is a practical reference which covers on a clause-by-clause basis, the differences between the NEC3 and NEC4 Engineering and Construction Contracts (ECC). Using clear and simple language, the book will allow the reader to gain a rapid overview of all the updates to the ECC Contract forms. This revised edition includes coverage of January 2019, October 2020, and January 2023 amendments.

The book presents each clause of NEC3 ECC opposite the new wording of NEC4 ECC with all changes highlighted. Detailed explanatory notes are included which describe the significance of important changes. Users will be able to look up any clause in the NEC3 ECC and see at a glance, what, if anything, has changed. The book covers all updates to the NEC ECC but it will also be useful for those using other contracts in the NEC4 contract suite, so anybody wishing to understand the new provisions applied across the suite of NEC4 contracts will benefit from this book.

Written by an established NEC expert, and a member of the NEC4 drafting team, this companion to the NEC4 ECC will be a valuable resource for anyone who is familiar with the provisions of NEC3 ECC and is looking for an easy-to-use comparison of the changes between the two editions.