Time extensions in construction contracts
Construction contracts generally allow the construction period to be extended where there is a delay that is not the contractor's fault. In the United States, this is described as a time extension. The UK equivalent is an extension of time (EOT).
When it becomes reasonably apparent that there is, or that there is likely to be, a delay that could merit a time extension, the contractor gives written notice to the contract administrator identifying the relevant event that has caused the delay. Time extensions are granted based on the contractor being able to demonstrate that the delay was caused by events beyond their control. The contract guidelines typically specify the provision of time extension requests.
There are various circumstances in which time extension requests will be valid, including:
- Delays are caused by the owner changing the design.
- A delayed start to the works by request of the owner.
- Site conditions (e.g. sub-surface conditions) that differ from the project plans.
- Exceptionally adverse weather.
- Variations to the original scope or contract required by the owner.
- Force majeure.
- Legal issues that affect project completion or the contractor’s performance.
- The supply of materials and goods by the owner.
There are various circumstances in which time extension requests will be deemed invalid, including:
- Delays are caused by subcontractors.
- When the workforce is insufficient.
- The contractor underperforms, i.e. by procuring long-lead items.
- Delays caused by normal adverse weather conditions.
- Where there is inadequate evidence that irrecoverable delays have not been caused by the contractor.
In order for a time extension to be granted it is important that the contractor is transparent and communicative in their dealings with the owner and the project team. The project manager must be informed at the earliest opportunity and, if they deem it valid, they will submit a formal time extension request. For further information, see What should be included in a time extension request?
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
C20 Society; Buildings at Risk List 2025
10 more buildings published with updates on the past decade of buildings featured.
Boiler Upgrade Scheme and certifications consultation
Summary of government consultation, closing 11 June 2025.
Deputy editor of AT, Tim Fraser, discusses the newly formed society with its current chair, Chris Halligan MCIAT.
Barratt Lo-E passivhaus standard homes planned enmasse
With an initial 728 Lo-E homes across two sites and many more planned for the future.
Government urged to uphold Warm Homes commitment
ECA and industry bodies write to Government concerning its 13.2 billion Warm Homes manifesto commitment.
From project managers to rising stars, sustainability pioneers and more.
Places of Worship in Britain and Ireland, 1929-1990. Book review.
The emancipation of women in art.
Call for independent National Grenfell oversight mechanism
MHCLG share findings of Building Safety Inquiry in letter to Secretary of State and Minister for Building Safety.
The Architectural Technology Awards
AT Awards now open for this the sixth decade of CIAT.
50th Golden anniversary ECA Edmundson awards
Deadline for submissions Friday 30 May 2025.
The benefits of precast, off-site foundation systems
Top ten benefits of this notable innovation.
Encouraging individuals to take action saving water at home, work, and in their communities.
Takes a community to support mental health and wellbeing
The why of becoming a Mental Health Instructor explained.
Mental health awareness week 13-18 May
The theme is communities, they can provide a sense of belonging, safety, support in hard times, and a sense purpose.
Mental health support on the rise but workers still struggling
CIOB Understanding Mental Health in the Built Environment 2025 shows.
Design and construction material libraries
Material, sample, product or detail libraries a key component of any architectural design practice.