Keeping a tree on a construction drawing does not ensure that it survives the work. Damage can occur below ground when vehicles compact soil, trenches sever roots or changes in levels alter growing conditions. Tree protection needs to shape the construction plan early.
Assess before arranging the site
Commission a suitably qualified arboricultural assessment of trees that may be affected. Use it to define protection areas and identify where the proposed work conflicts with roots, trunks or canopies. Arboricultural Association guidance on construction near trees stresses root protection and the importance of expert assessment. [1]
Position access routes, storage, temporary services and machinery accordingly. Do not treat the area beneath a retained canopy as spare space for materials or excavated soil.
Control changes during the work
Mark agreed protection measures on the drawings used by the contractor and explain them before work starts. Any unexpected need to excavate near a retained tree should trigger review before digging continues.
Keep an inspection record, including damage and changes to the method of work. Arrange follow-up assessment where needed. A completion photograph showing a standing tree cannot establish that its root system escaped harm.
Sources and further reading
- Arboricultural AssociationGuidance on no-dig construction near trees (PDF)