Collusion
Glossary of procurement terminology, A guide for suppliers, Published by the London Borough of Richmond upon Thames in April 2012, suggests that collusion is: ‘A fraudulent arrangement between two or more parties whereby prices or service requirements are manipulated to get round competitive tendering.’
As part of a selective tendering process, tenderers may be required to complete a ‘Declaration of Non-Collusion’ (sometimes referred to as a ‘Declaration of Non-Collusion Form’ or a ‘Certificate of Non-Collusion’). This is intended to prevent corruption in the tender process by requiring a declaration from the tenderer that they have not colluded with any other party in the preparation of their tender.
For more information see: Declaration of non-collusion.
NB The Chartered Institute of Procurement & Supply (CIPS) Glossary of procurement terms, defines collusion as: ‘Where two or more potential suppliers (or the purchaser and one or more suppliers) secretly co-operate to undermine the competitiveness of a tender process.’
Public procurement toolbox, terminology, published by the Organisation for Economic Co-operation and Development (OECD), states: ‘Collusion involves a horizontal relationship between bidders in a public procurement, who conspire to remove the element of competition from the process by raising or fixing the prices and reducing output in order to increase profits. Bid rigging is the typical mechanism of collusion in public contracts. (see Bid rigging).’
[edit] Related articles on Designing Buildings
- Anti-bribery and Ethics - A Construction Perspective.
- Bid evaluation.
- Bid rigging.
- Bribery in construction.
- Construction contract.
- Contract award.
- Contract negotiation.
- Cover pricing.
- Declaration of non-collusion.
- Monopoly.
- Procurement route.
- Record keeping.
- Rescission.
- Tender documentation.
- Tender processes.
- This is why construction is so corrupt.
Featured articles and news
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.
Delayed, derailed and devalued
How the UK’s planning crisis is undermining British manufacturing.
How much does it cost to build a house?
A brief run down of key considerations from a London based practice.
The need for a National construction careers campaign
Highlighted by CIOB to cut unemployment, reduce skills gap and deliver on housing and infrastructure ambitions.
AI-Driven automation; reducing time, enhancing compliance
Sustainability; not just compliance but rethinking design, material selection, and the supply chains to support them.
Climate Resilience and Adaptation In the Built Environment
New CIOB Technical Information Sheet by Colin Booth, Professor of Smart and Sustainable Infrastructure.
Turning Enquiries into Profitable Construction Projects
Founder of Develop Coaching and author of Building Your Future; Greg Wilkes shares his insights.




















