Invitation to Tender (ITT) in Construction

By

Kristen Frisa

, Janine Trinidad

, and Taylor Riso

Reviewed by 

Nicholas Dunbar

and Zoe Mullan

Last Updated Mar 2, 2026

By

Kristen Frisa

, Janine Trinidad

, and Taylor Riso

Reviewed By

Nicholas Dunbar

and Zoe Mullan

An invitation to tender (ITT) is an official document a client issues to encourage contractors to submit tenders for a construction project. The ITT provides all tenderers with information about the project, including scope, duration, submission guidelines and minimum qualifications. By ensuring all tenderers receive the same project details, the ITT promotes fairness and genuine competition throughout the procurement process. It forms the foundation of procurement in the construction industry and is the key process through which clients select contractors to deliver a project.

This article provides a comprehensive understanding of invitations to tender, their role in the construction industry, and how contractors and clients can use them effectively. It's a valuable resource for contractors seeking insights on responding to ITTs and for clients looking to draft well-crafted, impactful documents.

The Anatomy of an ITT

Clients or their representatives issue ITTs to formally invite contractors and suppliers to submit pricing on a construction project. This type of tendering is most common in the public sector, though clients also use it on private projects. To encourage fairness, transparency and competition, clients frequently advertise ITTs publicly to reach a wide pool of potential tenderers.

The ITT provides detailed, uniform information to all tenderers to encourage competitive tenders. Its purpose is to identify a contractor who can effectively complete the project at a fair price, within the specified timeframe, and adhere to established quality standards.

Under UK law, an ITT functions as an 'invitation to treat' rather than a binding offer. This means it invites contractors to submit tenders, but does not oblige the client to accept any of them. A contract is only formed once a tender is formally accepted. However, strictly adhering to the stated evaluation criteria is legally vital, particularly in public procurement, to avoid fairness-based challenges.

While the components of an ITT vary from project to project, the following are common elements:

• Project Particulars

  A brief, high-level overview of the project.

• Scope of Works

  A comprehensive breakdown of the work, including tasks, deliverables, activities and any special requirements.

• Specifications

  Detailed technical information about the scope of works. To ensure their tenders accurately capture all technical requirements, tenderers rely on specifications for clear guidelines covering materials, design, dimensions, performance, functionality and other technical considerations.

• Drawings

  Architectural and engineering drawings, schedules or diagrams that illustrate the desired design, layout and system requirements.

• Pricing Schedule or Bill of Quantities (BoQ)

  A detailed itemisation of materials, plant and labour required, allowing contractors to price the work accurately and ensuring parity in tender returns.

• Programme

  The proposed programme for the work, including start and completion dates as well as significant milestones or deadlines.

• Contractual Terms & Conditions

  The terms and conditions governing the working relationship between the client and the selected contractor. These are often based on standard forms such as JCT (Joint Contracts Tribunal) or NEC 4 (New Engineering Contract) and include payment terms, insurance requirements, dispute resolution methods, and other stipulations.

• Instructions to Tenderers

  Instructions on how to prepare and submit the tender, including deadlines, the required format and any specific forms, information or documentation that must be included.

• Evaluation Criteria

  In the UK public sector, tenders are rarely evaluated on price alone. The Procurement Act 2023, replaced the previous Most Economically Advantageous Tender (MEAT) framework with the Most Advantageous Tender (MAT). This shift removes the obligation to include price in every assessment, giving contracting authorities greater flexibility to weight quality, technical merit and Social Value – such as a contractor's contribution to local employment or sustainability targets – more heavily than cost where appropriate.

What an ITT Achieves

ITTs are the initial step in the procurement process for construction projects. They are typically the first formal communication from the client to the contractor regarding tendering. A well-crafted ITT is a communication tool enabling clients to effectively express and define their project requirements and expectations to potential tenderers. This sets the stage for subsequent evaluation and contract award.

ITTs also enable a like-for-like comparison. They allow clients to evaluate tenders effectively and select the most competitive offer that aligns with the project's requirements and budget. This approach supports the highest-quality outcome within available budget constraints. In public projects, the transparency of open tendering allows for public review, driving accountability and mitigating the risk of corruption or fraud.

Although ITTs are commonly associated with open tendering, clients also use them in selective tendering. This is where they seek tenders from a chosen group of contractors – often those with whom they have an established relationship.

Effective Use of ITTs

Effective use of ITTs by both clients and contractors is key to establishing a transparent and competitive procurement process. For clients, ITTs remove bias from the selection process and are central to receiving competitive pricing, mitigating risk and selecting qualified contractors. The structure and clarity of an ITT can influence both the overall cost and quality of a construction project. For contractors, success in pursuing ITTs directly affects commercial performance and profitability.

For both parties, success throughout the ITT process depends on clear communication and a shared understanding of project scope and specifications. This provides a solid foundation for successful project delivery.

Strategies for Clients

Identify Contractors Through Market Research

Before issuing an ITT, clients typically conduct market research to identify contractors with relevant experience and qualifications. Online platforms such as the Procore Construction Network allow clients to search for and filter tenderers based on project objectives, including location, trade and market sector.

Prequalify Tenderers

Clients often prequalify tenderers based on financial stability, past performance, technical capabilities and adherence to health and safety standards. Typically, they issue a Pre-Qualification Questionnaire (PQQ). This process ensures that only competent and reliable contractors receive an invitation to tender, enhancing the likelihood of high-quality submissions and successful projects.

Create Clear Tender Documents

Ensuring the entire tender package is clear minimises confusion and potential errors. When minor details in the documents are unclear or contradictory, contractors spend time resolving those issues rather than focusing on preparing a strong proposal. Well-crafted documents lead to better quality tenders.

Write a Detailed Scope of Works

A comprehensive scope of works gives contractors a thorough understanding of the project, including timeline, key milestones, objectives and any specific requirements or constraints. Clear, detailed project information enables contractors to produce precise cost and time estimates. As a result, the tender levelling process becomes more straightforward, and the risk of overlooking crucial project aspects is reduced. Ultimately, this produces more accurate and competitive tenders.

Establish a Clear Project Programme

Clear timelines and milestones allow contractors to plan their work programme and allocate resources efficiently. The programme should also reflect external constraints. For example, the critical opening date of a school under construction or permitted working hours for an occupied building refurbishment. Clients should provide a realistic programme that accounts for possible delays and unforeseen challenges. This is an increasingly important consideration given supply chain disruptions, skilled labour shortages and other volatile market forces.

Define Evaluation Criteria

By clearly indicating which aspects of a tender carry the most weight, clients enable contractors to align their proposals accordingly. Transparency around factors such as cost, experience or a specific methodology empowers contractors to tailor their submissions more effectively. This results in more targeted, high-quality tenders.

Maintain a Transparent Process

Transparency and openness in the tender process encourage greater contractor participation. Clearly communicating the evaluation criteria and their relative weights – and consistently assessing and comparing tenders – limits bias and favouritism. Basing the selection decision solely on the merits of proposals builds trust with contractors. It also gives them confidence that all tenders will be assessed fairly. This, in turn, cultivates their willingness to tender on future opportunities.

Allow Sufficient Time for Tender Development

Providing contractors with sufficient time to prepare their tenders ensures they can adequately address all project requirements. This results in more thoughtful and competitive proposals. Conversely, a rushed tender process risks extending the contract development phase. This means any perceived time savings at the front end may cause delays later when quality has been compromised during tendering.

Communicate Promptly & Responsively

Throughout the tendering process, clients should promptly address tenderer queries, clarifications and concerns. Timely, accurate responses demonstrate professionalism and maintain positive relationships with potential tenderers. Keeping all tenderers informed of any changes or updates ensures contractors have a comprehensive understanding of the project's requirements and can submit accurate, precise tenders.

Advertise the ITT Broadly

Using a variety of channels – including print and online platforms – to advertise the ITT attracts a wider, more diverse pool of contractors. This expanded competition typically produces higher-quality and more competitive tenders.

Engage with Tenderers After the Process

Once the tendering process is complete, clients should engage constructively with unsuccessful tenderers to offer feedback. This demonstrates that the effort invested in preparing a tender was valued, even where a contractor was not selected. It increases the likelihood that those contractors will participate in future opportunities, knowing the client is committed to transparency and their continued improvement.

Evaluate & Improve the Process Continuously

After awarding the project, clients should conduct a thorough evaluation of the ITT process. Seeking feedback from both tenderers and internal stakeholders helps identify areas for improvement. Incorporating these lessons into future ITTs enhances the efficiency and effectiveness of tendering over time.

Strategies for Contractors

Review All ITT Documentation Thoroughly

Contractors should read all documents in the ITT package carefully, including the project description, specifications, drawings and contractual terms and conditions. It is important for contractors and clients to be familiar with the Housing Grants, Construction and Regeneration Act 1996 and its 2011 amendments, which govern payment and adjudication rights across the industry. Additionally, contractors should note all specific requirements, deadlines and evaluation criteria outlined in the ITT.

Understand the Project Scope

After reviewing the ITT documentation, contractors must develop a comprehensive grasp of the project scope as set out in the ITT and derived from the drawings and specifications. This understanding – encompassing requirements, timelines and evaluation criteria – will significantly shape how they approach tender preparation.

Conduct a Site Visit

Where possible, contractors should request a site visit to gain first-hand knowledge of site conditions, surroundings and any potential challenges. A site visit enables a more accurate assessment of the project. It provides additional insights and allows contractors to tailor their tender accordingly.

Seek Clarification

Where uncertainties arise regarding the ITT, contractors should proactively contact the client or the designated point of contact. By raising queries through a Tender Query (TQ) or a request for clarification, contractors demonstrate their commitment to submitting a comprehensive and precise tender while reducing the risk of misunderstanding the specifications. Before submitting a query, prospective tenderers should review the tender documents to confirm they follow any stated process requirements.

Seek Specialist Subcontractor Input

Actively seeking input from specialist subcontractors helps contractors identify and address potential risks while drawing on specialised knowledge and expertise. This proactive approach significantly enhances the quality of the tender and increases the likelihood of securing the project.

Develop a Detailed Cost Estimate

Contractors should prepare a comprehensive, accurate cost estimate that aligns with the ITT specifications, breaking down costs into components such as labour, materials, plant, subcontractors and overheads. The estimate should be competitive yet realistic, covering all expenses while generating the desired profit margin.

Explore Value Engineering Opportunities

Contractors should look for opportunities to propose cost-saving measures or value engineering options without compromising the project's quality or the client's objectives. This is an opportunity to differentiate a tender and make it more attractive.

Clearly Articulate Tender Pricing Details

Contractors should include clear tender clarifications or qualifications within the documentation, explicitly identifying any assumptions or qualifications made in pricing. By specifying what is included or excluded from the tender price, contractors avoid potential ambiguities. This ensures that both parties share a common understanding of the scope and any associated limitations.

Follow Submission Instructions

Contractors should pay close attention to the submission instructions in the ITT. It's necessary to submit the tender in the required format – physical or electronic – and meet any requirements such as multiple copies or file formats. All required documentation must be included, such as accreditations, certifications, company accounts, insurance certificates and any requested forms. Failure to provide the requested documents may result in outright disqualification.

In UK public sector tendering, submission deadlines must be treated as firm. Under the principle of equal treatment that underpins the Procurement Act 2023, contracting authorities are generally expected to reject late submissions to ensure all tenderers are assessed on the same basis. Private sector tenders may offer slightly more flexibility, but punctuality remains a key indicator of reliability.

Seek Post-tender Feedback

Contractors should follow up with the client to request feedback on unsuccessful tenders. This demonstrates a commitment to continuous improvement and provides valuable insights for strengthening future submissions.

ITT vs RFP vs PQQ

When procuring contractors for construction projects, clients have several options available, including the invitation to tender (ITT), the Pre-Qualification Questionnaire (PQQ) and the Request for Proposal (RFP). While each method obtains competitive offers, they differ in focus, objectives and the level of detail required from tenderers.

• ITT

  Focuses on specific requirements where the 'what' and 'how' are largely defined, and price is the key differentiator. Its primary objective is to seek competitive tenders and select the most economically advantageous tenderer – that is, the contractor offering the best value who can also comply with programme and regulatory requirements. The selected contractor is often the lowest tenderer.

• Request for Proposal (RFP)

  An RFP is a document issued by a client to invite contractors or suppliers to submit proposals for a specific project or scope. Clients use an RFP when seeking a solution to a complex problem and inviting the contractor to propose their methodology and approach. Proposals are evaluated on a range of factors, typically outlined in the RFP, including the proposed approach, price, qualifications and technical expertise, with the focus on selecting the best overall value.

• Pre-Qualification Questionnaire (PQQ)

  A PQQ is a selection document that clients use to prequalify contractors or suppliers based on their qualifications, experience and capabilities. The PQQ creates a shortlist of prequalified tenderers who will later be invited to participate in the subsequent tendering or proposal stage. The focus is on evaluating qualifications and capabilities rather than detailed cost or pricing, assessing criteria such as experience, references, financial stability and insurance requirements.

The Future of Tendering

The tendering process in construction continues to evolve, adapting to changing industry practices, technological advances and the demand for more efficient, transparent processes.

As the industry has digitised, ITTs have transitioned from traditional paper-based documents to easily accessible digital formats. Clients – including organisations and government agencies – now use online software platforms and electronic procurement systems to issue and evaluate ITTs and manage the tendering process. This shift has streamlined communication, improved accessibility for contractors and reduced administrative burdens.

Increasingly, contractors and clients are also moving towards eTendering platforms. These systems ensure compliance and manage the distribution of large drawing packages. They also centralise RFI (Request for Information) management and maintain a secure audit trail of all communications, replacing disorganised email chains and reducing administrative risk.

Contractors can use digital tender management tools to centralise communication, facilitate document sharing and support the prequalification of subcontractor tenderers. These platforms integrate smoothly with broader construction management systems, enabling tender information to flow directly into project management processes and enhancing efficiency, communication and transparency throughout.

Looking ahead, emerging technologies hold potential to further enhance trust, transparency and competition in the tendering process. Blockchain, in particular, could transform procurement by creating a secure, verifiable and immutable ledger of all tender-related activities. This would reduce the likelihood of disputes. Both parties would have confidence that records are accurate and auditable, and provide a clear, indisputable account of all interactions.

As blockchain technology continues to advance, it holds real potential to modernise the construction industry – promoting transparency, efficiency and trust throughout tendering and into project execution.

Written by

Kristen Frisa

Contributing Writer | Procore

114 articles

Kristen Frisa is a contributing writer for Procore. She also contributes to a variety of industry publications as a freelance writer focused on finance and construction technology. Kristen holds a Bachelor of Arts in Philosophy and History from Western University, with a post-graduate certificate in journalism from Sheridan College. She lives in Ontario, Canada.

View profile

Janine Trinidad

Staff Trainer and Program Manager | Procore Technologies

26 articles

Janine Trinidad is a Construction Educational professional for Procore Technologies. In previous roles, Janine managed all phases of construction on hotel, mixed-use, and institutional projects in the San Francisco Bay area. She was responsible for negotiating contract budgets and change orders, managing RFIs and submittals, and overseeing quality control, among other duties. She is also a certified transformational coach with a focus on women-centered and trauma-informed methods. She is passionate about transforming the construction industry to be a healthier, more successful and welcoming place to work and believes technology and education are allies in doing so.

View profile

Taylor Riso

Contributing Writer

95 articles

Taylor Riso is a marketing professional with more than 10 years of experience in the construction industry. Skilled in content development and marketing strategies, she leverages her diverse experience to help professionals in the built environment. She currently resides in Portland, Oregon.

View profile

Reviewed by

Nicholas Dunbar

Content Manager | Procore

65 articles

Nick Dunbar oversees the creation and management of UK and Ireland educational content at Procore. Previously, he worked as a sustainability writer at the Building Research Establishment and served as a sustainability consultant within the built environment sector. Nick holds degrees in industrial sustainability and environmental sciences and lives in Camden, London.

View profile

Zoe Mullan

27 articles

Zoe Mullan is an experienced content writer and editor with a background in marketing and communications in the e-learning sector. Zoe holds an MA in English Literature and History from the University of Glasgow and a PGDip in Journalism from the University of Strathclyde and lives in Northern Ireland.

View profile