Reasons for tree felling and removal include;
The tree has become weakened and brittle due to disease or pest infestation
The roots are causing damage to pavements, swimming pools, building structures or underground utilities. In some cases, roots can spread 2-3 times further than the branches. Cutting the roots off weakens the tree causing stress and instability. Trees without enough root support can be more easily blown over in a storm.
Surrounding structural changes such as building or installing a swimming pool
The tree is dropping branches, leaves, twigs, floral blossom or bark on roof tops and in gutters, which may cause blockages. This can result in a leaky roof or water damage to the inside or outside of property when it rains
The tree is taking too many nutrients from the soil and is depriving other plants
It has become a safety risk due to its size or age