For quick budgeting, consider per-foot ranges: $12-$70/ft for material, with installation adding $8-$60/ft. Homeowners and contractors typically pay for guardrails based on materials, installation labor, and site-specific factors such as railing height, length, and mounting method. This article presents clear cost estimates and practical pricing guidance for U. This guide provides a comprehensive 2024 breakdown of every factor. Revised: 05-09-2023 Use this spreadsheet tool for estimating major items of work. Non-penetrating system, sits on top of roof surface, uses heavy bases for support.