For pond installation this very much depends on local ground conditions. In a low-lying, waterlogged site it’s much better to avoid winter and wait until the drier months. This particularly applies if you have clay soil.
Installing a pond usually involves a digger and often a dumper too, so is much better suited to drier ground. At Wild Ponds we take great pride in our work so would rather conditions aided us in giving you the wildlife pond you desire. We also do our very best to avoid damage to surrounding parts of your garden such as lawns; drier conditions help greatly in this too.
That said, on sandy free draining sites we can often work all year round.
Planting your new wildlife pond is also dictated by the seasons. Many pond plants die back and enter semi-dormancy during winter, so planting outside of the growing season is best avoided. This particularly applies to our wildlife ponds where planting is directly into the soil, and rapidly growing roots will anchor the plants and avoid disturbance from visiting waterfowl. At Wild Ponds we therefore limit our planting to between April and September.