The concept of the ‘green roof’ has gained a lot of attention in recent years, not least in very urbanised areas where there is a lack of green space. As well as sucking emissions out of the air, they can also soak up rainwater and help prevent flash flooding on the impermeable concrete and tarmac streets below.

Some may go for a simple grass or moss covering, but if you have flat roofing in Manchester you may want to create your own urban garden, with potted flowers, shrubs and maybe even a small tree. 

If you are thinking of this, there are a few considerations to take into account, not least the state of the roof before you start. As the Royal Horticultural Society (RHS) notes, it needs to be firm and sturdy, capable of taking the extra weight of the plants, soil, compost and other items that may go on top of it.

The RHS also noted the importance of the roof being in a good state of repair, not least that it needs to be waterproof. Now is a good time to check this on a flat roof anyway with winter approaching, but the importance will be even greater if moisture-retaining soil is going to lie on top of it.

In addition, there is the key issue of whether you need planning permission for your project. This will almost certainly be so because you will be adding features to your home’s exterior in an elevated position and that may impinge on the privacy of the neighbours as well as having a significant visual impact. 

As ever, there may be specific planning issues with certain buildings and areas. For instance, a conservation area will have its own provisions, while anyone living down the road in the Peak District will find they must deal with the strict rules set by the National Park Authority.

However, if you can create a rooftop garden, it may become a wonderful feature of your home, especially if there is no green space at ground level.