Every agency shows you their best work. What you need to know is how they behave in week six, when revisions pile up and launch is close.
7 Questions to Ask Before Hiring a Web Design Agency
Ask who will actually work on your project and whether you can meet them. Ask what happens if you dislike the first design โ how many revisions, and at what cost. Ask who owns the domain, hosting and source code (the only correct answer: you). Ask what is delivered for SEO on day one, how long support lasts after launch, and what a typical delay looks like and why.
Finally, call one past client from the portfolio. Two minutes on the phone tells you more than any proposal deck ever will.