Defects date
NEC was first published in 1993 as the New Engineering Contract. It is a suite of construction contracts intended to promote partnering and collaboration. The third edition, NEC3 was published in 2005.
According to NEC, a defect is ‘…a part of the works which is not as stated in the Works Information or not in accordance with applicable law or the accepted design.’
Until the defects date, there is an obligation on both the supervisor and contractor to notify each other as soon as they are aware of a defect, although the contractor is obliged to rectify a defect whether or not they have been notified of it, and may even be instructed to search for a defect, although the reason for this must be given in the instruction.
The defects date is set out in the contract data and is a duration from the completion date, rather than a specific day. That is, the duration is the same whether or not the completion date set out in the contract is achieved. Typically the defects date is 26 or 52 weeks from the completion date.
The defects date is the last date on which the supervisor or the contractor can give a notification of defects and is also the last date on which compensation events can be notified.
At, or just after the defects date the supervisor issues a defects certificate, which either certifies that there are no remaining patent defects, or lists any uncorrected defects. This triggers the release of any remaining retention, although if there are any remaining defects listed on the defects certificate, a withholding notice may be served and retention may continue to be held.
The defect correction period defines the maximum period within which the contractor must rectify a notified defect. Different defect correction periods can be specified for different types of defects. The only circumstances when the defects certificate might not be issued on the defects date is if a previously notified defect has a defects correction period that ends after the defects date, in which case it is issued on the later date.
If notified defects are not rectified within the defect correction period, they may be rectified by others and the cost reimbursed by the contractor.
The parties to the contract are permitted to agree that certain defects need not be rectified, and in this case the contractor must submit a quotation for reduced prices, an earlier completion date or both, and an adjustment is then made to the works information.
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
- Certificate of making good defects.
- Decennial liability.
- Defective Premises - Liability and Measure of Damages.
- Defective Premises Act.
- Defects liability period.
- Defects.
- Defects certificate.
- Defects correction period.
- Delay damages.
- Dilapidations.
- Fit for purpose.
- Guarantees.
- Inspection.
- Latent defects.
- Opening up works for inspection and testing.
- Patent defects.
- Practical completion.
- Reasonable skill and care.
- Remedial work.
- Schedule of condition.
- Schedule of defects.
- Scott schedule.
- Site inspection.
- Site inspector.
Featured articles and news
What they are, how they work and why they are popular in many countries.
Plastic, recycling and its symbol
Student competition winning, M.C.Esher inspired Möbius strip design symbolising continuity within a finite entity.
Do you take the lead in a circular construction economy?
Help us develop and expand this wiki as a resource for academia and industry alike.
Warm Homes Plan Workforce Taskforce
Risks of undermining UK’s energy transition due to lack of electrotechnical industry representation, says ECA.
Cost Optimal Domestic Electrification CODE
Modelling retrofits only on costs that directly impact the consumer: upfront cost of equipment, energy costs and maintenance costs.
The Warm Homes Plan details released
What's new and what is not, with industry reactions.
Could AI and VR cause an increase the value of heritage?
The Orange book: 2026 Amendment 4 to BS 7671:2018
ECA welcomes IET and BSI content sign off.
How neural technologies could transform the design future
Enhancing legacy parametric engines, offering novel ways to explore solutions and generate geometry.
Key AI related terms to be aware of
With explanations from the UK government and other bodies.
From QS to further education teacher
Applying real world skills with the next generation.
A guide on how children can use LEGO to mirror real engineering processes.
Data infrastructure for next-generation materials science
Research Data Express to automate data processing and create AI-ready datasets for materials research.
Wired for the Future with ECA; powering skills and progress
ECA South Wales Business Day 2025, a day to remember.
AI for the conservation professional
A level of sophistication previously reserved for science fiction.
Biomass harvested in cycles of less than ten years.
An interview with the new CIAT President
Usman Yaqub BSc (Hons) PCIAT MFPWS.
Cost benefit model report of building safety regime in Wales
Proposed policy option costs for design and construction stage of the new building safety regime in Wales.
Do you receive our free biweekly newsletter?
If not you can sign up to receive it in your mailbox here.
























