Residual Method
The residual principle has been referred to in the context of rental values of shops and
agricultural land, where the analysis of land price appears fairly consistent with the economic theory of rent as a surplus. This concept is employed in valuing building land, where a logical approach to land value is to estimate the ‘output’ value in terms of the price which can be expected for completed buildings, and to deduct ‘input’ costs, such as site preparation, building costs, fees and finance charges. If there is then a surplus, it can be expected that the entrepreneur (developer) will make a bid for the land, subject first to an allowance for profit and risk.
Contractors Method
The Contractors method of valuation can be used for buildings are designed to be used by Town Councils or public sector/healthcare/military workers, and are therefore quite unique and it’s simply not appropriate or possible to value it for a commercial use. These properties very rarely change hands and because of this, almost no comparable evidence is available.
The contractor's method works on the basis that a property's value can be equated to its cost. That is, the cost of the land plus the cost of the buildings upon it equals the value of the property as a whole. Moving to a different site and having a similar building constructed would have little change on the value of the property. This is because no significant market forces exist for the building so its value is likely to be similar whichever comparably sized site is used. In other words, the value of the property is based on its use which intrinsically has no commercial application. Examples of this are fire stations, hospitals and bus depots.
The basic equation for the contractor's method of valuation is:
Value of existing property = cost of building + cost of site - depreciation and obsolescence allowances