Did you know that today there are more mobile devices than there are people on earth? Or that 20 per cent of people aged 18 - 34 only use mobile devices when online?
Therefore, I make your website responsive, and that is, it adapts to the screen size on which it is displayed. Then your customers can reach you wherever they are and whatever they're looking for whether it's mobile, tablet or pc.
And considering all the different sizes found on mobile phones, tablets and pc screens, a responsive website is something one should have.
In fact, Google has recently changed its search criteria, preferring websites adapted to mobile devices. So considering being more easily found online, it might be a bit wise to have a responsive website.
Today, most websites are made responsive since most people use mobile when they are online, so this is no longer something you have to pay extra for or ask for specifically.
However, since many people use very large screens when working on PCs, many designers limit the width of the content to make it easier to read. I make most of my web pages with a width of 1920px, and it's a width that works fine.