Provide a few details about your project and receive competitive quotes from local pros. The average national cost of window installation is $4,747, with most homeowners spending between $2,643 and $7,091.This data is based on actual project costs as reported by HomeAdvisor members. Windows can bring light and warmth, provide views, beautify inside and out and add tremendous value to your home.rovide a few details about your project and receive competitive quotes from local pros. The average national cost of window installation is $4,747, with most homeowners spending between $2,643 and $7,091.