Bidder
When a firm such as a contractor or other supplier in the construction industry wants to secure work for its business, it will usually submit a proposal (a ‘tender’, 'quote' or ‘bid’) to a prospective client and in so doing becomes a ‘bidder’. The bid is a detailed description of how the supplier will manage and complete the works required if chosen by the client. If the bid is successful, the supplier will be selected to carry out the work.
In bidding for the project, suppliers usually try to submit their lowest possible price for consideration by the awarding body (the client). However, this may not be the sole criterion in selection as the supplier's experience, qualifications, availability, quality and so on may also be considered.
There are numerous ways of becoming a bidder but traditionally the main ways are:
- Invitation to tender (ITT): the client selects a group of suppliers and invites them to tender (bid) for the project by releasing details against which the tenderers assess the works required. They will include their price for supplying the goods or services along with proposals for how the client’s requirements will be satisfied. Bids must be submitted by a specified deadline.
- Call for tenders: project owners (clients) release project information to contractors and sub-contractors in an attempt to solicit bids. This can include public announcements advertising the project and making published construction data available to any interested parties.
Public projects or publicly-subsidised projects may be subject to OJEU procurement procedures (this may change when the UK leaves the EU). The regulations set out rules requiring that contracts must be advertised in the Official Journal of the EU (OJEU). The OJEU can therefore constitute a useful tool by which potential bidders are made aware of up-and-coming projects.
[edit] Related articles on Designing Buildings
- Best value.
- Bid evaluation.
- Bid writer.
- Common mistakes in construction tenders.
- Compliant bid.
- E-procurement.
- How to prepare tender documents.
- Most Economically Advantageous Tender (MEAT).
- Non-compliant tender.
- OJEU procurement rules.
- Pre-qualification questionnaire.
- Pre-tender interviews.
- Procurement route.
- Restricted procedure under the Single Procurement Document (Scotland).
- Selection criteria.
- Specification.
- Tender.
- Tender documentation.
- Tender evaluation.
- Tender pricing document.
- Tender settlement meeting.
- Things to avoid when tendering.
- TUPE considerations and bidding.
Featured articles and news
Plumbing and heating for sustainability in new properties
Technical Engineer runs through changes in regulations, innovations in materials, and product systems.
Awareness of the Carbon Border Adjustment Mechanism
What CBAM is and what to do about it.
The new towns and strategic environmental assessments
12 locations of the New Towns Taskforce reduced to 7 within the new towns draft programme and open consultation.
Buildings that changed the future of architecture. Book review.
The Sustainability Pathfinder© Handbook
Built environment agency launches free Pathfinder© tool to help businesses progress sustainability strategies.
Government outcome to the late payment consultation, ECA reacts.
IHBC 2025 Gus Astley Student Award winners
Work on the role of hewing in UK historic conservation a win for Jack Parker of Oxford Brookes University.
Future Homes Building Standards and plug-in solar
Parts F and L amendments, the availability of solar panels and industry responses.
How later living housing can help solve the housing crisis
Unlocking homes, unlocking lives.
Preparing safety case reports for HRBs under the BSA
A new practical guide to preparing structural inputs for safety cases and safety case reports published by IStructE.
Male construction workers and prostate cancer
CIOB and Prostate Cancer UK encourage awareness of prostate cancer risks, and what to do about it.
The changed R&D tax landscape for Architects
Specialist gives a recap on tax changes for Research and Development, via the ACA newsletter.
Structured product data as a competitive advantage
NBS explain why accessible product data that works across digital systems is key.
Welsh retrofit workforce assessment
Welsh Government report confirms Wales faces major electrical skills shortage, warns ECA.
A now architectural practice looks back at its concept project for a sustainable oceanic settlement 25 years on.
Copyright and Artificial Intelligence
Government report and back track on copyright opt out for AI training but no clear preferred alternative as yet.
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.
Inspiration for a new 2026 wave of Irish construction professionals.
New planning reforms and Warm Homes Bill
Take centre stage at UK Construction Week London.


























