10 key steps and factors for vetting and selecting the right contractor


Navigating the complex landscape of medium-sized construction projects in the UK can be a daunting task. As a senior architect, arming oneself with knowledge on best practices for vetting and selecting the right contractors is crucial. This article provides a comprehensive guide informed by authoritative resources including the RICS Professional Guidance, UK Tendering Strategies; RICS Procurement of Facility Management; the RICS New Rules of Measurement (NRM), and the RIBA Job Book (10th Edition). The aim is to equip you with proven strategies for identifying potential contractors, evaluating their suitability, and eventually choosing the partners who will bring your vision into reality.

10 Factors to Consider When Vetting Contractors

  1. Experience and Past Performance: Any contractor you consider should have a proven track record of successfully completing projects similar to yours. This includes not just the quantity, but the quality of their work. Ask potential contractors for a portfolio of their work or references from previous clients. Having a team that has already navigated similar challenges will greatly reduce potential risks and result in smoother project execution.
  2. Financial Stability: The financial health of the contractor is paramount. For medium-sized projects, you’ll want a contractor with the financial stability to handle the costs associated with the project, including labour, materials, and any unexpected expenses. This can be assessed through credit checks and examining their financial statements.
  3. Health and Safety Record: A good contractor takes health and safety seriously. Check their past records for any violations, accidents or complaints. The contractor should have a robust safety program in place, which includes regular safety training and on-site safety protocols.
  4. Skills and Expertise: Ensure the contractor’s team has the necessary skills and expertise to complete the project to the highest standard. This includes technical knowledge and qualifications, as well as softer skills such as problem-solving and project management.
  5. Resource Availability: The contractor should have the necessary resources, from manpower to equipment, to get the job done on time and budget. Check whether they have sufficient staff and whether they own or have access to the necessary specialist equipment if required.
  6. Quality Assurance: Determine if the contractor has a structured quality assurance process, ensuring that the work is completed to the highest possible standard. This should include regular inspections and audits, as well as a solid warranty program.
  7. Insurance and Guarantees: Make sure the contractor has the correct insurances, such as public liability insurance and professional indemnity insurance. Don’t forget to ask for details about their guarantees, which should cover their work for a specified period post-completion.
  8. Reputation: Reputation is built on trust and reliability, so seek out reviews, testimonials, and feedback from previous clients. This can help you gauge the contractor’s reliability, professionalism, and ability to deliver on their promises.
  9. Sustainability and Environmental Responsibility: With growing emphasis on environmental sustainability in construction, check the contractor’s commitment to sustainable practices. This can include their waste management plans, use of eco-friendly materials, and compliance with environmental regulations.
  10. Communication Skills: Communication is key in any construction project. The contractor needs to be able to effectively communicate with various stakeholders, from architects and engineers to site workers and suppliers. Look for a contractor who prioritizes clear, routine, and effective communication.

10 steps to ensure the right contractor is selected for the project

Choosing the right contractor for your project can be a daunting task, and it’s a decision that can significantly impact your project’s success. To simplify the process, we’ve broken it down into ten manageable steps. This step-by-step approach not only makes the task less overwhelming but also ensures that all necessary activities are carried out diligently. This helps to reduce risks, avoid costly mistakes, and, most importantly, select the most suitable contractor for your project. In the following section, we will walk through these ten critical steps, that will guide you through the journey of selecting the right contractor efficiently and effectively.

Step 1. Establishing Selection Criteria:

The initial step in the contractor selection journey is to establish a comprehensive and objective set of selection criteria. These standards will serve as the blueprint throughout your selection process, determining the capabilities and qualities you are seeking in a contractor. The criteria must align with the specific needs and goals of your construction project, and should consider factors such as past performance, financial stability, health and safety records, skill sets, and the contractor’s ability to meet deadlines and budgets. RICS Professional Guidance, UK Tendering Procedures and other key documents can provide valuable insights and guidance in formulating these criteria. It is crucial that these standards are clear, measurable and relevant to ensure a fair and effective selection process.

Step 2. Pre-Qualification Questionnaire (PQQ):

The Pre-Qualification Questionnaire (PQQ) stage is a critical element in the process of selecting the right contractor. Its purpose is to screen potential contractors, ensuring they possess the necessary qualifications, competency and financial capability to deliver the project. The PQQ should be comprehensive, covering all key factors such as experience, financial stability, health and safety record, resource availability, and more. It should be crafted in a way that sets clear criteria and encourages transparency from the bidders. Based on the responses received, you will be able to shortlist those who meet your project’s requirements. This step not only saves time but also helps to avoid potential pitfalls later in the project, by ensuring that only suitable, high-quality contractors are invited to tender.

Step 3. Evaluation of PQQ Responses:

Once the Pre-Qualification Questionnaires (PQQs) have been submitted by the potential contractors, they must be thoroughly evaluated within the terms set out in the RICS guidance documents. It’s a crucial step to assess the potential of the contractors based on the responses they have provided. This evaluation will act as a sieve, filtering out those who do not meet the necessary criteria, thus reducing the pool to only the most able and suitable contractors. This process of evaluation should be undertaken with objectivity, fairness, and transparency, ensuring each PQQ is given the same level of scrutiny to guarantee an unbiased result.

4. Invitation to Tender (ITT):

Following a thorough evaluation of the Pre-Qualification Questionnaire responses, the next step is issuing an Invitation to Tender (ITT). This crucial step, backed by the RICS Professional Guidance and UK Tendering Procedures, involves providing a detailed project brief and tendering document to the shortlisted contractors. The document should provide comprehensive information including project scope, timelines, cost expectations, evaluation criteria, and any specific requirements such as sustainability or quality standards. Contractors are given a reasonable timeline for their responses, ensuring they have adequate time to develop a highly competitive and fully compliant bid. Always remember to stipulate a clear deadline for submission to ensure a fair and orderly selection process.

5. Tender Evaluation

Tender evaluation is a critical step in the selection process, serving as the bridge between invitation to tender and final contractor appointment. During this stage, all tender submissions are examined meticulously to assess how well they meet the defined selection criteria. RICS professional guidance advises a structured approach, employing a scoring system weighted towards the project’s unique requirements. This might include elements such as proposed methodology, value for money, quality of materials, and project timeline.

Throughout this evaluation, it’s vital to remain objective and fair to ensure the best contractor for the project is selected. The input from senior architects is invaluable here, given their technical expertise and understanding of the project’s intricacies. As per the RICS New Rules of Measurement and CIOB Complex Projects Contract 2013 Guide, the tender evaluation should also consider the contractor’s potential for innovation, sustainability commitments, and robustness of their risk management strategies. This comprehensive evaluation ensures that the chosen contractor not only offers competitive pricing, but also aligns with the project’s overarching goals and values.

6. Interviews / Presentations:

Once the initial evaluation of candidate contractors is complete, it’s time for a more personal assessment: interviews and presentations. This stage is crucial in assessing if a contractor’s approach aligns with the project’s objectives. It provides an opportunity for the contractors to demonstrate their understanding of the project and highlight their unique selling points. They can discuss how their skills and expertise would contribute to the success of the project and address any potential issues. It is also an excellent platform for you, as a senior architect, to gauge their communication skills and professionalism. A structured interview or presentation process that is fair, transparent and consistent for all bidders is recommended by the RICS Professional Guidance and RIBA Job Book.

7. Reference Checks and Verification:

Conducting detailed reference checks and verification is a vital step in selecting the right contractor for your project. This is not simply a cursory glance at the reference letters provided, but rather a comprehensive verification process. This includes contacting previous clients to inquire about the contractor’s reliability, adherence to schedule, quality of work, and their overall experience. Furthermore, it also involves verifying the contractor’s financial stability, insurance coverage, and checking their credentials with regulatory bodies such as the Construction Industry Council (CIC) and the Chartered Institute of Building (CIOB). It’s worth remembering that this rigorous verification process serves to ensure that your investment is safeguarded, and the project is less likely to encounter unforeseen obstacles down the line.

8. Contractor Appointment:

After the evaluation process, the next crucial step is the appointment of the successful contractor. This is not a mere formality but a vital stage where the final decision should be based on all the accumulated data and analysis. The appointment is typically made through the issuance of a formal letter of intent or contract award, confirming the acceptance of the bid and outlining the terms and conditions of the contract. It is essential to ensure that all parties fully understand and agree to the project scope, deliverables, timeframes, and responsibilities stated in the contract. The RICS Professional Guidance and the CIOB Complex Projects Contract 2013 Guide provide more detailed instructions on this, reinforcing the value of a clearly defined and unambiguous contract.

9. Contract Negotiation and Signing:

The penultimate step involves negotiating the terms and conditions of the contract. This is a crucial process where the architect and the selected contractor align their expectations, responsibilities, and liabilities for the project. It is imperative to cover all project specifics such as scope, timeline, costs, and payment terms during these discussions. Consideration must also be given to the clauses pertaining to project variations, delays, and dispute resolution mechanisms. It is highly recommended to involve legal counsel to ensure that the contract is fair and complies with all regulatory requirements.

Once the contract has been mutually agreed upon and all inconsistencies have been addressed, it is time for signing. This formalises the agreement and binds both parties to their respective commitments. Remember, even after signing, the contract may need to be revisited and possibly amended as the project evolves and unforeseen circumstances arise. Therefore, maintain an open line of communication with your contractor even post-contract signing. This will ensure a smooth working relationship and successful project completion.

10. Debrief Unsuccessful Bidders:

The final yet crucial step in the contractor selection process is the debriefing of unsuccessful bidders. This process not only provides transparency, but it also enhances the reputation of your organisation by demonstrating your commitment to proper business conduct. When debriefing, give clear and constructive feedback, outline the areas where they fell short, and provide suggestions for improvement. However, remember to tread carefully to avoid any potential disputes, using the RICS Professional Guidance and the RICS Procurement of Facility Management as guidelines. Ultimately, this step will foster a positive relationship with potential contractors for future projects.


In conclusion, selecting the right contractor is instrumental in the success of any project. By breaking down the selection process into ten methodical steps, you ensure that every necessary detail is accounted for, thus minimising the risk of costly oversights. This process is not just about hiring a contractor but about choosing a partner who will help bring your vision to life. Remember, the objective is not only to find a contractor who can complete the task, but one who understands your project’s goals and can deliver on time and within budget. Therefore, spend adequate time on this process and make your choice wisely. By following the steps outlined in this article, you are setting your project up for the success it deserves.