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
UKCW London to tackle sector’s most pressing issues
AI and skills development, ecology and the environment, policy and planning and more.
Managing building safety risks
Across an existing residential portfolio; a client's perspective.
ECA support for Gate Safe’s Safe School Gates Campaign.
Core construction skills explained
Preparing for a career in construction.
Retrofitting for resilience with the Leicester Resilience Hub
Community-serving facilities, enhanced as support and essential services for climate-related disruptions.
Some of the articles relating to water, here to browse. Any missing?
Recognisable Gothic characters, designed to dramatically spout water away from buildings.
A case study and a warning to would-be developers
Creating four dwellings... after half a century of doing this job, why, oh why, is it so difficult?
Reform of the fire engineering profession
Fire Engineers Advisory Panel: Authoritative Statement, reactions and next steps.
Restoration and renewal of the Palace of Westminster
A complex project of cultural significance from full decant to EMI, opportunities and a potential a way forward.
Apprenticeships and the responsibility we share
Perspectives from the CIOB President as National Apprentice Week comes to a close.
The first line of defence against rain, wind and snow.
Building Safety recap January, 2026
What we missed at the end of last year, and at the start of this...
National Apprenticeship Week 2026, 9-15 Feb
Shining a light on the positive impacts for businesses, their apprentices and the wider economy alike.
Applications and benefits of acoustic flooring
From commercial to retail.
From solid to sprung and ribbed to raised.
Strengthening industry collaboration in Hong Kong
Hong Kong Institute of Construction and The Chartered Institute of Building sign Memorandum of Understanding.
A detailed description from the experts at Cornish Lime.























