A lean-to roof is a simple and cost-effective roofing solution that is commonly used in gardens, backyards, and outdoor storage spaces. There are a number of synonyms for the term 'lean-to roof', including pent roof, skillion roof, mono-pitched roof, and single-slope roof. Each of these terms describes a type of roof that is constructed with a single slope, tilted downwards away from the main structure. Lean-to roofs are ideal for attaching to existing buildings or structures, and are often used to create covered patios, porches, or carports. They are also popular for use as storage sheds, as they provide ample space for storing tools, equipment, and other items.