In Hong Kong, Trees of Particular Interest (TPI) receive special protection measures and require special permission for any actions. For example, application for tree removal of a TPI is extremely complicated and may be rejected if there is insufficient supporting expert documentation. In addition to TPI’s, Old and Valuable Trees (OVT) and Stone Wall Trees (SWT)

We have assisted with 100’s of TPI and OVT tree assessments for construction works feasibility studies, construction works preparation, Environmental Impact Assessments (EIA), and ongoing monitoring of TPI and OVT trees.

These trees have been defined by the Development Bureau and have one or more of the following characteristics:

Types of Trees of Particular Interest (TPI)

  1. Trees of 100 years or older
  2. Trees with trunk diameter at breast height exceeding 1 meter or with height or crown spread exceeding 25 meters
  3. Fung Shui trees – This is subject to public opinion and may be defined by those living near the trees or regularly visiting the trees
  4. Heritage trees (Landmark trees) with evidential records to support the historical or cultural significance
  5. High-profile Trees – Trees which may arouse widespread public concerns
  6. Trees which may be subject to strong local objections on removal
  7. Rare tree species listed in the “Rare and Precious Plants of Hong Kong”or Endangered plant species protected under the Protection of Endangered Species of Animals and Plants Ordinance

Services We Offer for TPI Trees (as well as OVT and SWT)

Trees of Particular Interest require a higher level of detailed and advanced assessment for determining the tree’s condition and how to work around it. We have equipment such as:

  1. the Resistograph wood density analysis device for high resolution measurement of tree wood density,
  2. Sonic Tomography equipment for internal structure analysis,
  3. Tree Root Detection and Mapping equipment for estimation of tree root area and defining the TPZ – Tree Protection Zone (or CRZ – Critical Root Zone)
  4. Aerial assessment by rope access tree climbing or aerial lift for evaluating the upper crown (canopy) of the tree
  5. Airspade soil excavation device for visually confirming tree root locations, excavating trial pits and trenching for identification of tree roots, and much more

We have vast experience with successfully managing these types of trees and can assist with various aspects of the management process. Contact us today if you need our assistance.