Paving Over Front Gardens Contributes to Hotter Nights
A recent study suggests that paving over front gardens is exacerbating the urban heat island effect, particularly at night.
## The Impact of Paved Front Gardens on Urban Heat Island Effect The UK's household gardens cover an area three times larger than all the country's nature reserves combined. However, as the demand for car parking increases, many front gardens are being paved over. Research indicates that this loss of green space is contributing to the urban heat island effect, particularly at night. ## How Paved Surfaces Contribute to Heat Island Effect Hard surfaces such as pavement absorb heat during the day and then slowly release the heat overnight. In contrast, leafy green gardens release moisture into the atmosphere, which helps to cool the air as the water evaporates. A Chinese study published in Nature Scientific Reports found that changing paved gardens back to grass could reduce night-time temperatures by as much as 0.5C, and adding trees would double the benefit, bringing 1C of night-time cooling. ## Alternatives to Paving Over Front Gardens While paving over front gardens may seem like a convenient solution for car parking, it is not the only option. Small additions such as a planting strip, a hedge, or a tree can make a difference in reducing the urban heat island effect. London's "De-pave your garden" programme provides tips on how to go from grey to green and help to keep your neighbourhood cooler when the next heatwave rolls in. According to the Royal Horticultural Society, the percentage of paved front gardens in the UK has risen from 7.5% in 2005 to 55% in 2025. ## Conclusion The loss of green space in front gardens is having a significant impact on the urban heat island effect, particularly at night. By incorporating green elements into our front gardens, we can help to reduce the heat island effect and create a cooler and more sustainable environment.
