$3.69. Get an INSTANT estimate of the cost to Install a Vinyl Soffit! Our free calculator uses recent, trusted data to estimate costs for your Vinyl Soffit Installation project. For a basic 125 feet project in zip code 47474, the benchmark cost to Install a Vinyl Soffit ranges between $2.57 - $3.69 per linear foot.To estimate costs for your project: 1. Set Project Zip Code Enter the Zip Code for the location where labor is hired and materials purchased.2.or a basic 125 feet project in zip code 47474, the benchmark cost to Install a Vinyl Soffit ranges between $2.57 - $3.69 per linear foot. To estimate costs for your project: