How to Build a Roofing Cost Estimate in Singapore Singapore’s hot, humid climate and the high concentration of high‑rise buildings mean that roofing can be a significant line item on a construction budget. A solid estimate is the first step to avoid surprises, stay on schedule, and keep the project within budget. Below is a practical step‑by‑step guide, a sample cost table, and a quick example of how to put everything together. 1. Gather the Essentials What to Collect Why It Matters Roof type & pitch (flat, low‑sloped, pitched)