How to Choose a Web Design Agency

Choosing a web design agency is one of those decisions that feels harder than it should be. Everyone’s portfolio looks good. Everyone says they’re strategic. Everyone claims to put the user first. So how do you actually tell who’s worth your money?

I’ve been running Trevatt Design since 2010. I’ve seen agencies from both sides: as someone pitching for work, and as someone who inherits the mess when a client’s previous agency didn’t deliver. Here’s what I’d tell a friend if they asked me how to choose.

Look at the work, then look deeper

Every agency has a portfolio. The question isn’t whether the sites look nice. The question is whether they work.

Pick two or three sites from the portfolio and actually use them. Load them on your phone. Try to find the contact page. Try to understand what the company does within five seconds. Check if the site loads quickly. See if the navigation makes sense.

A portfolio full of pretty screenshots tells you the agency can design. A portfolio full of sites that are fast, clear, and easy to use tells you the agency understands the job.

Ask about process, not just outcomes

Any agency can show you a finished product. What matters is how they get there.

Ask them what their process looks like. Do they start with research? Do they create wireframes before visual design? Do they involve you in feedback rounds? How do they handle revisions?

If the answer is vague ("we’ll figure it out as we go"), that’s a red flag. A good agency has a clear process because they’ve refined it over years of projects.

Check if they understand your business

This is the one that separates the good from the great. Before they talk about colours and layouts, do they ask about your customers? Your competitors? Your business goals?

A website that looks fantastic but doesn’t speak to your audience is a vanity project. The agency should be asking who you’re trying to reach, what action you want visitors to take, and how the website fits into your broader business strategy.

If the first conversation is all about design trends and technology choices, they’re solving the wrong problem first.

Understand what you’re paying for

Get the scope in writing before you commit. This should cover design, development, content (if included), SEO setup, CMS training, browser and device testing, hosting configuration, and post-launch support.

The most common source of frustration I hear from clients who come to us after a bad experience is "we didn’t realise that wasn’t included." That’s partly on the client for not asking. But it’s mostly on the agency for not being clear.

A good agency will give you a detailed proposal that breaks down what’s in scope and what’s not. If the quote is a single number with no explanation, push back.

Watch out for these signs

They don’t have a website themselves. Or their site is slow, outdated, or broken. If they can’t look after their own presence, what makes you think they’ll look after yours?

They guarantee first-page Google rankings. Nobody can guarantee that. If they claim they can, they’re either lying or using tactics that will get your site penalised.

They build on proprietary platforms. If you can only edit your site through their system, and you have to keep paying them monthly to maintain it, you don’t own your website. You’re renting it.

They outsource everything. Some agencies are essentially project managers who subcontract the design and development to freelancers or offshore teams. That’s not inherently bad, but you should know about it. Ask who will actually be doing the work.

They haven’t asked you a single question. If they jump straight to a quote without understanding what you need, they’re guessing. And you’ll be paying for those guesses.

Size matters, but not the way you think

A bigger agency isn’t automatically better. A freelancer isn’t automatically worse. What matters is whether their setup matches your project.

If you need a simple 5-page site and you hire a 50-person agency, you’ll be their lowest-priority client and you’ll pay for overhead that doesn’t benefit you.

If you need a complex platform with integrations and multi-market rollout, a solo freelancer probably isn’t the right fit, no matter how talented they are.

Match the scale of the team to the scale of the project.

Ask for references

Not testimonials on their website. Actual references. Ask to speak to a previous client. Ask what went well. Ask what didn’t. Ask if they’d hire the agency again.

Most agencies won’t volunteer this. The ones who do are confident in their track record.

Trust your instincts

After all the research, the proposals, and the reference checks, there’s a gut feeling that matters. Did they listen to you? Did they explain things clearly? Do you feel like they understood what you’re trying to achieve?

You’re going to be working with these people for weeks or months. If the communication feels off during the sales process, it won’t get better once they have your money.

Where we fit

We’re a small London agency. We’ve been doing this since 2010. We handle strategy, UX, design, and development in-house, and we don’t take on more projects than we can give proper attention to.

If you’re weighing up your options and want a straight conversation about whether we’re the right fit, drop us a line. We’re happy to talk even if you end up going elsewhere.