Where do i start,.....
RED is a bad colour. I like the gradient design, but switch to a nice green maybe.
Negative wording (Reader warning) is going to loose a LOT of potential customers and you should remove every last trace of it. Sell how good you are, don't mention how bad everyone else is.
Your meta tags need a lot of work,.. your keywords shouldn't be capitalised either.
Get rid of text that is all capitals,.. in headers/links too.
Some text is white, some is black, some yellow,... choose one and go with it (I like the white).
Get rid of the google search and clock,.. replace with a pic of you in your work uniform (Head & shoulders) smiling at the camera
Get some good pics of you & your team working (NOT STOCK PHOTO'S), your vehicles, and ask permission from a few customers to take before & after pics,... real pics sell.
Your links page is missing a link to my business website, the Guild website & ACS,.. probably your worst mistake!!

Keep working on it Simon,.. a good website takes a couple of weeks to get right.