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Guide for Plant Appraisal
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Attention: ISAO Members & Others Who Appraise Trees |
Planning for the 10th Edition
As the 10th edition of the CTLA Guide for Plant Appraisal is still in the development stage and may be for a few years yet, your Regional Plant Appraisal Committee has made the following recommendations.
Please look closely and define your assignment first. If you can work successfully with a real estate appraiser and can research the comparable data for the tree(s) contribution to real estate market value, then I expect that CTLA will mandate this approach whereever possible.
1) RPAC Installation Cost Survey (download pdf file)
Any arborist that plants trees for customers please fill out this form.
2) RPAC Species Survey
Follow this link:
http://spreadsheets.google.com/viewform?formkey=cHhWTVZXcEtzZFF6Q0p2amEyOV9HT3c6MA
Please complete the survey only for the species that you work with on a regular basis. We will use this information to determine updated specific species rating percentages for Canadian Climatic Zones. Note: list the zone that you typically work but not necessarily live in.
Species list as of February 2009 (download pdf file).
If you prefer not to fill out the survey online, here is a pdf of the google survey and an Excel file for data entry. A sample record is provided in the excel sheet as an example. Please email the completed survey to Chris Gynan.
3) If you are using a cost approach, then decide whether replacement cost, cost of cure, cost of repair, or the trunk formula method is best suited for the valuation.
On the Trunk Formula Method Appraisal (download pdf file), note that the revised unit tree cost calculation will be based on retail installed cost – not a generic utc based on wholesale cost only as we used in the past supplement (dated 1997).
4) Largest Commonly Available Size for Each Tree Species (download Excel file).
To qualify as such, the selected largest size of each species must be available from at least two wholesale nurseries. If a tree species is not shown in the table, then we recommend that you use a similar species that will provide the lost benefits of the appraised tree. Please ensure that the tree size is available from your local nursery and then choose a median nursery to finalize the price of the tree. As we develop up-to-date species factors, we will post a revised table. Until then, we recommend that you use the factors supplied in the Ontario supplement to the 8th edition.
5) Finally, for installation costs, you will need to verify prices with a local contractor. At this point, we recommend that you include all material, labour, delivery, overhead, profit and a two year guarantee to complete the final retail installed cost. The ISAO RPAC has found a common factor of 2.5 times wholesale cost to closely represent retail installed cost for most “frontyard” applications.
Once CTLA has completed the 10th edition to the Guide for Plant Appraisal, we hope to publish our regional supplement.
Jack Radecki
ISAO RPAC Chair
Last Modified: Sunday, December 13, 2009
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