The answer is, depends. When we give a quote  the price includes installing all the necessary components of a Radon system. One of the biggest things I see being left off Radon systems is Fire Collars. When routing a pipe through a fire wall, such as the wall between the home and garage that is attached you need to install a fire barrier material, wrapped in a metal sleeve. (this could save your home if there were a fire in the garage)  Fire caulk will not collapse a 3″ PVC pipe. So, on a Radon system fire caulk will not be sufficient. If the garage has a finished drywall ceiling, that also may be a firewall, so it too may need a fire collar. The biggest thing that companies are doing out there (not just for Radon) is installing electrical work, without a licensed electrician. It is illegal to install, for hire, any electrical work if you are not licensed. Most municipalities also require a permit, which needs to be acquired by the electrical company. Not using an electrician or getting a permit can save a company $100 to $150 on the cost of installing the system, so they will show a lower cost. Anyone who says you don’t need an electrician for a simple outlet is not being truthful, and is taking a risk if they get caught in paying hundreds of dollars in fines. We will match anyone’s price, but their proposal/system needs to match ours. A wise man once said, “getting the cheapest job done is like getting the cheapest set of tires put on your car. They may be round & black, but you won’t like them once you go down the road.”