Depending on the level of its sophistication, a self-installed, hardwired home security system will run between $50 and $300. A similar wireless system will cost between $250 to $750 or more. The average cost of an advanced home security system installed by a home security company is about $1,500. Monitoring fees are about $500 per year. Be careful about long-term service contracts from a home security company. They can be expensive to cancel.