vetting contractors guide for architects

Vetting Contractors – the 2024 Guide for UK Architects

As a UK architect, you will work with a wide range of contractors, each specializing in different aspects of construction. 

Some general contractors oversee the entire project, hire subcontractors, and ensure that work is completed to the architect’s specifications. 

On the other hand, there are also speciality contractors who focus on specific aspects of construction, such as electrical work, plumbing, HVAC systems, or sustainable building design. These contractors are vital for ensuring that the technical aspects of a design are executed correctly.

PlanMan has a special co-consultants module to handle your work with contractors, sub-contractors, and speciality third-party consultants. 

However, before you put your trust in contractors or co-consultants, you need to approach vetting them very seriously. 

It’s best to develop a system of vetting your contractors and stick to it to avoid potentially serious problems.

Top problems that contractor vetting solves

Bad work

One of the primary issues that can arise from not vetting contractors is the risk of subpar work quality. 

Architects might end up hiring contractors who lack the necessary skills, experience, or attention to detail. This leads to poor construction quality, which can affect the overall integrity and safety of the project – and, ultimately, your reputation as an architect.

Budget overruns

Another significant problem is the potential for budget overruns. 

Contractors who are not thoroughly vetted may provide inaccurate cost estimates or fail to manage resources efficiently, leading to unexpected expenses and change orders.


A major problem is the risk of non-compliance with UK building regulations and codes. Contractors who are not properly vetted may lack knowledge or certification, and violations can result in fines, delays, or even the need for rework.

Legal issues

Not vetting contractors can lead to serious legal issues. 

If a contractor does not have the necessary licenses, insurance, or permits, the architect and the client could be held liable for any accidents or damages that occur during the construction process.

Running background checks on your contractor

UK architects can start by verifying the contractor’s business details to run comprehensive background checks for contractors. 

This includes checking the contractor’s company name, address, contact information, and the contractor’s registration with Companies House.

If the project is big, you, as an architect, have full rights to check for any legal issues related to the contractor. This can be done by searching for the contractor’s name in online legal databases or by hiring a professional background check service. 

What you want to know is whether the contractor has any history of litigation.

Checking the contractor’s work history and references is another key part of the vetting process. 

Architects can ask for a list of previous projects the contractor has worked on and contact the owners or architects of those projects to get feedback. 

Online review platforms can also be a valuable resource for getting unbiased opinions about the contractor’s work – but they should not be the ultimate factor since the reviews can be manipulated.

Architects should also verify the contractor’s insurance and licensing. You can do this by requesting copies of the contractor’s insurance certificates and checking the contractor’s license status with the relevant regulatory bodies.

Evaluating your contractor’s fiscal health and financial stability

Vetting contractors for fiscal health is a crucial step in ensuring the success of a project, and financial stability information is a major part of any comprehensive background check. 

Architects can request financial references or reports from the contractor or use online resources to check the contractor’s credit rating. A financially stable contractor is less likely to encounter issues that could delay or derail the project. 

Low credit ratings can be a red flag, indicating that the contractor may struggle to meet its financial obligations. 

Architects should also check for any liens or judgements against the contractor, as these could indicate serious financial difficulties.

UK architects should also adopt the habit of assessing the contractor’s cash flow. Cash flow is the amount of cash coming in and going out of a business.

A contractor with a positive cash flow is generally considered to be in good financial health. Be wary of contractors with inconsistent cash flow, as this could indicate instability.

Also, consider the contractor’s profitability. A profitable contractor is more likely to have the financial resources necessary to complete a project. You can assess a contractor’s profitability by examining its profit margin, which is the percentage of revenue that remains after all expenses have been deducted.

Checking contractor’s communication skills

Vetting contractors for communication skills is a crucial step for UK architects. Bad communication skills can backfire on all phases of the project, starting from visioning workshops. We’ve created an advanced communication module within PlanMan, but if your partners lack proper communication skills, no software will help.

First, assess the contractor’s written communication skills. This can be done by reviewing their proposal, email correspondence, and any other written materials. 

Look for clarity, conciseness, and professionalism in their writing. 

Errors, vague language, or overly complex jargon could indicate poor communication skills. Pro tip – make sure your own architectural writing is on point to attract contractors who can write, too!

Next, consider the contractor’s verbal communication skills. You can evaluate this during meetings or phone calls. 

Pay attention to their ability to explain complex concepts coherently, their listening skills, and their willingness to ask questions. 

A good communicator will be able to articulate their thoughts clearly and will show an understanding of your needs and concerns.

Another important aspect to consider is the contractor’s responsiveness. A contractor with good communication skills will respond to your inquiries in a timely manner. Delays in responses or failure to respond at all can be a red flag, indicating potential communication issues down the line.

Last but not least, assess the contractor’s ability to handle feedback and criticism since, during the course of a project, there may be times when you need to provide constructive feedback.

Conducting contractor Interviews

When conducting contractor interviews, UK architects should first prepare a list of specific questions that both directly relate to the project at hand and span beyond it. 

These questions should cover the contractor’s experience, qualifications, and approach to work. 

Consider asking about previous projects, especially those similar in scope and complexity to the proposed one.

During the interview, pay close attention to the contractor’s communication style. They should also be open to feedback and willing to collaborate closely with the architect.

Architects should start by discussing the contractor’s approach to budgeting and timelines. Understand how the contractor estimates costs and handles changes to the budget or schedule. It’s essential to find a contractor who can deliver high-quality work while staying within the project’s financial and temporal constraints.

Finally, architects should consider the contractor’s values and how they align with theirs. This could cover areas such as sustainability, innovation, and community involvement. A shared set of values can foster a strong, productive working relationship between the architect and the contractor.

Decoding contractor proposals

Navigating UK contractor proposals is a key component of your role as an architect. These documents may seem overwhelming at first glance, but it’s essential to understand their intricacies to ensure a successful project outcome. Proposals offer insight into a contractor’s approach, projected costs, project timeline, and a lot more. 

Start by carefully reviewing the scope of work. Make sure all your project requirements are covered and look out for any additional services or charges that could escalate costs. 

Examine the proposed timeline thoroughly; does it seem realistic? 

Also, look for evidence of efficient resource management, demonstrating the contractor’s expertise and organizational skills. 

It’s also critical to assess the cost structure. Are costs itemized fairly? Is there an allowance for contingencies or unforeseen issues? Remember, a cheaper proposal isn’t always better. It can sometimes signal compromises on materials and labour, potentially affecting the project’s quality. 

Finally, understand their warranty services—these should be transparent and comprehensive. It’s also wise to ask for references or examples of their past work for similar projects to validate their capabilities and reputation. 

It may feel tedious, but thoroughly decoding proposals will support informed decisions and ensure a harmonious partnership with your chosen contractor. 

UK Contractor red flags – the checklist

Here’s a quick recap of all the major red flags that should make you reconsider working with a contractor:


In the UK, while there isn’t a specific license for general contractors, they should have the necessary certifications for their trade. 

For example, electricians should be registered with a Competent Person scheme, and gas engineers should be on the Gas Safe Register.


Limited or no insurance coverage is another warning sign. Contractors should carry both public liability insurance and employer’s liability insurance.

Lowballing offers

While it might be tempting to save money, an unusually low bid could indicate that the contractor is planning to cut corners, use substandard materials, or is desperate for work — none of which bodes well for the quality of the finished project.

Upfront payment demands

Contractors who ask for a large amount of money upfront or insist on cash payments are another red flag. 

While it’s normal for contractors to require some payment in advance, asking for more than 30% could indicate financial instability or a lack of trustworthiness.

Bad communication

Architects should also pay attention to a contractor’s communication skills. If they’re evasive, unresponsive, or vague in their responses, it could indicate a lack of professionalism or reliability.

Litigation background

Architects can check this by doing a background check on the contractor. If they have been involved in numerous legal disputes or have a history of complaints, it could indicate a pattern of poor workmanship or unethical behaviour.

Unclear company info

Be cautious of contractors who don’t have a physical address or whose business seems to lack permanence. This could indicate a fly-by-night operation that could disappear before the project is completed, leaving the architect and client in the lurch.

If you want a top-of-the-line technical solution for dealing with contractors as an architect, check out PlanMan. We’ve designed this architecture project management software to help you minimize friction and avoid all possible issues. Sign up today and start structuring your work properly!