I'm guessing you're (I'm assuming you're Lubomir Stepus) incredibly proud of that patch of hair on your head, it's all you can see in the photo when you scroll down the page, at least on my pc anyway. I'm allowed to joke about this, I have no hair on my head
There's some sort of scaling/fit issue with your image because the image is clearly supposed to be more than just the top of your head.
You seem to duplicate a lot of what's on the home page on the about us, services and contact pages.... being identical like it is could actually hurt your seo. It kind of feels like your home page is a 1 page website that you've then split up into the other pages without changing anything... basically your layout and content needs to be reworked if you're going for a multi page website.
Image seems to be fixed to me.
When I scroll down the menu bar at the top disappears - I think it would be nice if that stayed at the top as you scroll.
My problem is it doesn't excite me. What I'd like to see when I land on the page is what you do. What am I interested in getting in contact with you today about.
Opening the page to a wooden structure - looks like a borefest to me.
But then I scroll down and I see your services.
I think the services section should be higher up - prominent when you open the page.
I'd think about putting the services in a 2 x 2 - and put the contact us a sidebearing.
When it goes to the repsonsive state ( 1 x 1) - then maybe Contact us button under each section
About Us should be last maybe on the list and at the end of the website.
Then it looks like you have a lot of pictures that you've personally done - looks great.
Then gets to the Contact Us and Inspection Certs section and you're using a Stock image?
It would be far better to take the photos or use photos you have - if that's your building, or you standing in front of your branded van, or just you even talking on your phone, or sitting at your computer - holding a cert - handing a cert to a client (if you have to hire someone to hand it to).
The personal images are great, no need for stock.
Finally - you need a section for before and after images.
Just think it's a little sparse.