Measuring a roof safely
You don't need to climb on the roof to estimate materials. Measure the building's length and width from the ground, judge the pitch (many UK houses are between 30° and 45°), and the roof tile calculator works out the true slope area for gable, hipped and lean-to roofs.
Tiles, slates and battens
Coverage depends on the tile and its gauge (the spacing of the battens). Large interlocking concrete tiles cover around 10 per square metre, while small plain tiles need about 60. The calculator includes battens, breathable membrane and ridge tiles so you can compare options before getting quotes.
Gutters and downpipes
The guttering calculator turns your runs into 4m lengths, brackets, unions, stop ends, outlets and 2.5m downpipes, and checks whether your gutter size can cope with the roof area it drains. It's useful for planning a replacement or pricing a quote you've been given.