If you're going to ask, here's the best way to do it:
Here goes nothing.
Your logo isn’t you. Your colours, fonts, imagery, services, etc are you. Your whole website should reflect your brand and your identity. It should reassure people of your expertise and exude your personality as a company. You’re recognisable as a person for all your features and your style, would you want to make your head bigger? Didn’t think so.
The logo is generally positioned in the top left of your site. We read from left to right, top to bottom. So it’s likely to be one of the first things a visitor sees. That’s also where they expect the logo to be. So if they were unsure if they’re on the right site, that’s where they’d look. It doesn’t have to dominate the page for them to notice it.
We’d even go as far as to say...
“The bigger your logo, the smaller your company looks.”
Consider Apple. Huge company, tiny logo. Do you think Steve Jobs asked Jony Ive to make the logo bigger? And guess what. As we all know, the iPhone has got bigger and bigger. One thing that has stayed the same size *whispers* "the logo."
As long as the text is legible and the icon is clear, your logo is big enough. If your icon is overly complex, simplify it, don’t make it bigger.
So if you ask us to make your logo bigger and we say “no.” That’s why.