In most cases, the use of a system with pipes and a fan is used to reduce radon. It is called a sub-slab depressurization system and does not require major changes to your home. The cost generally ranges between $500 - $2500, with an average of $1000.
Request a free do-it-yourself radon mitigation packet. The packet includes mitigation equipment suppliers, instructions for installation, Pennsylvania's Consumer's Guide To Radon Reduction and a Radon Services Directory of certified mitigators.