Renewability in buildings refers to the use of materials, systems, or energy sources that can be naturally replenished or regenerated. Renewable resources, such as timber from sustainably managed forests, natural fibres, or solar and wind energy, offer alternatives to finite or non-replaceable materials and fuels. The design of renewable buildings often integrates biobased materials, passive energy strategies, and technologies that support continuous regeneration. The key idea is that renewability ensures ongoing resource availability while minimising environmental impact and dependency on non-renewable inputs.