Call-off contract
A call-off contract, also known as a blanket order, is a purchase order which enables bulk orders over a period of time. This is a form of framework agreement that is often used in construction where projects can last for months or even years.
The benefit of using a call-off contract is that it allows the supply of materials to be secured over multiple delivery dates, meaning that a customer does not have to hold excess stock (e.g. all the bricks required to build a housing development) on site; instead they can ‘call off’ stock as and when it is required.
This also reduces the amount of administration required to process multiple purchase orders. Instead, sales orders and invoice items are raised as they are needed until the point at which the contract is fulfilled, the end of the order period is reached, or the maximum order value (which is pre-determined) has been reached.
Another significant benefit is that call-off contracts are often negotiated with pre-determined pricing, which can offer discounts for bulk ordering. This is beneficial for suppliers who are guaranteed ongoing business over a period of time and can help them manage cash flows and orders.
Careful management of call-off contracts is essential, with appropriate controls in place. The customer should have confidence that the agreed pricing is maintained and the schedules for call-off are met; while the supplier should have firm control over their commitments, and make sure they do not over- or under-supply.
NB Glossary of procurement terminology, A guide for suppliers, Published by the London Borough of Richmond upon Thames in April 2012, defines a call-off contract as: ‘A contract made following a formal tendering process with one or more contractors, suppliers or service providers for a defined range of works, goods or services covering terms and conditions (including price) which users ‘call off’ to meet their requirements.’
STAR Procurement (a shared procurement service for Rochdale, Stockport, Tameside and Trafford Councils), Glossary of Terms, published in May 2019, defines a call-off contract as: ‘A contract awarded to a supplier or number of suppliers appointed to a Framework Agreement, to deliver the particular supplies, services or works required.’
The Chartered Institute of Procurement & Supply (CIPS) Glossary of procurement terms, defines a blanket order as: ‘An order that is placed with the supplier which allows the buyer to call off quantities as they need them over an agreed time period. This works in accordance with a manufacturing organisation’s production schedule.’
[edit] Related articles on Designing Buildings
Featured articles and news
Embedding AI tools into architectural education
Beyond the render: LMU share how student led research is shaping the future of visualisation workflows.
Why document control still fails UK construction projects
A Chartered Quantity Surveyor explains what needs to change and how.
New planning reforms and Warm Homes Bill
Take centre stage at UK Construction Week London.
A brief run down of changes intentions from April in an onwards.
Reslating an ancient water mill
A rare opportunity to record, study and repair early vernacular roofs.
CIOB Apprentice of the Year 2025/26
Construction apprentice from Lincoln Mia Owen wins this years title.
Insulation solutions with less waste for a circular economy
Rob Firman, Technical and Specification Manager, Polyfoam XPS explains.
Recycled waste plastic in construction
Hierarchy, prevention to disposal, plastic types and approaches.
UK Net Zero Carbon Buildings Standard V1 published
Free-to-access technical standard to enable robust proof of a decarbonising built environment.
Prostate Cancer Awareness Month
Why talking about prostate cancer matters in construction.
The Architectural Technology podcast: Where it's AT
Catch up for free, subscribe and share with your network.
The Association of Consultant Architects recap
A reintroduction and recap of ACA President; Patrick Inglis' Autumn update.
The Home Energy Model and its wrappers
From SAP to HEM, EPC for MEES and FHS assessment wrappers.
Future Homes Standard Essentials launched
Future Homes Hub launches new campaign to help sector prepare for the implementation of new building standards.
Building Safety recap February, 2026
Our regular run-down of key building safety related events of the month.
Planning reform: draft NPPF and industry responses.
Last chance to comment on proposed changes to the NPPF.
A Regency palace of colour and sensation. Book review.






















