The best materials for building a greenhouse in your garden will depend on a number of factors, including the size and style of the greenhouse, your climate, and your budget.

Here are some popular options:

Metal frame: Metal is a durable and weather-resistant option that is perfect for climates with cold weather. It is more expensive than wood but requires less maintenance.

PVC frame: PVC is a lightweight and affordable option that is perfect for mild climates. It is not as durable as wood or metal, but it requires very little maintenance.

Glass: Glass is the most traditional covering option for greenhouses, allowing maximum sunlight entry. It can be expensive and fragile, but it is very durable and weather-resistant.

Polycarbonate: Polycarbonate is a more affordable option than glass while being just as durable and weather-resistant. It is lighter than glass and less likely to break.