There are many things to consider when contracting a web design agency for your small business. Here are a few key factors to keep in mind: 

1. Size and complexity of project – A larger or more complex project will likely require a designer with more experience, while a smaller project may be better suited for someone with less experience. You can also get more information about the web design agency for small businesses via www.t40digital.co.uk.

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2. Design style – A designer who specializes in one particular design style may not be the best fit for your project, so it's important to ask about their approach before signing on the dotted line. 

3. Client communication – It's important that the designer is communicative and able to answer questions quickly. If there is delay in response or no response at all, this could lead to frustration on your part and ultimately lower quality work.

4. Customization – If you need customization or special features added to your website, make sure that the designer is up for the challenge and can provide a high level of service overall.

5. Price – Always bear in mind price when contracting a web design agency as it will play a significant role in determining final results. 

Some other things to look for in a web designer are: 

– Previous experience in design and/or online marketing 

– High level of skill and expertise in web design and development 

– Expertise in various design software programs 

– Experience with HTML, CSS, and JavaScript 

Overall, it's important to be sure that the designer you choose is the right fit for your project and can provide quality work at a fair price.