Deed of variation
A deed of variation can be used to formally change the terms of an existing contract. It is used when the parties involved - typically the client and the contractor - agree to alter specific provisions of their original contract after it has been executed. The deed ensures these changes are legally binding and properly documented, avoiding misunderstandings or disputes in the future. It helps maintain the integrity and continuity of the contractual relationship while allowing for necessary flexibility during the construction process.
Changes can include adjustments to the project schedule, costs, specifications, payment terms, or any other contractual obligations that need to be altered due to various reasons, such as unforeseen circumstances or mutual agreement to improve project outcomes.
All parties to the original contract must agree to the changes, and the deed must be signed by these parties to be legally effective. As a deed, it requires a higher level of formality than a simple contract variation. This often includes the need for witnessing signatures and sometimes the use of a company seal.
It should clearly state the specific clauses being amended and detail the new terms replacing the original ones. This helps maintain clarity and enforceability. It is often advisable to seek legal advice when drafting or agreeing to a deed of variation to ensure that all implications are fully understood and that the deed is correctly executed.
[edit] Related articles on Designing Buildings
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.
























