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<Stewart>
posted
I am trying to find details related to the valuation of Urban Trees. In the Uk there is a valuation system by a Mr Helliewell (Sp ?). Does anyone have details on the system or on an associated / different system in the USA. How do US arborists value the loss of a tree associated with building works or as a result of neglect.


Thanks in advance for any help


Stewart Brougham
Lecturer in Forestry
 
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<Russ Carlson>
posted
Reply to post by Stewart, on August 26, 2001 at 14:58:00:

In the US, the Council of Tree and Landscape Appraisers has developed a set of guidelines for the appraisal of trees. The Guide for Plant Appraisal is now in the ninth edition, published in 2000. This guide book provides the methods and techniques for plant appraisal.

However- It does require some training and experience. This is not something that should be applied without instruction and practice.

The Guide can be purchased from the American Society of Consulting Arborists at
15245 Shady Grove Road
Suite 130
Rockville, MD 20850
(301) 947-0483
http://www.asca-consultants.org

The first topic section on this board, Tree Appraisal and Valuation, deals with many of the issues involved in plant appriasal. I think you'll find it useful. Feel free to post more questions there about appraisal and its applications.

Russ Carlson
Registered Consulting Arborist
 
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<Scott Cullen>
posted
Reply to post by Stewart, on August 26, 2001 at 14:58:00:

There are a number of valuation schemes. Most, I think, take a depreciated replacement cost approach. If you are in the UK you may find that Helliwell is the most widely employed for "amenity" trees. You can obtain it from the Arboricultural Association http://www.trees.org.uk/
But there does seem to be some dissatisfaction with it judging from discussions on the UKTC list.

As Russ indicates CTLA is the most widely used in the US though there are regional variations. Individual cities (e.g. NYC) or tree owners like watersheds may have there own formulae... some without depreciation.

There are at least two methods in Australia: Burnley and Thyer. STEM is used in New Zealand. Methode Koch is used in Germany. I've heard there is a Spanish method but have never found it.

If you search the literature you'll find a number of studies looking at landscape trees as components of the market value of real property (regresion or paired sales analyses). None of these seem suitable for individual appraisal use but set some rules of thumb.

It is important to understand if the purpose and use of the appraisal is to make internal management decisions or to support legal action. If the latter any method selected must fit statute, regulation and case law which will vary both by and within jurisdictions. So none of the methods should be considered universally applicable nor to result in "intrinsic" value. In fact, IMO, intrinsic value is not even a meaninful concept in an appraisal context.
 
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