Three Kinds of Obsolescence

Physical obsolescence is the familiar kind. Materials deteriorate, systems wear, components fail. A roof membrane loses waterproofing, a chiller loses efficiency and reliability, concrete spalls. This is what condition surveys measure and what most capital plans are built around.

Physical obsolescence is usually gradual and predictable within a range. Its response is maintenance, repair and replacement on a sensible schedule.

Functional obsolescence happens when a building, or part of it, no longer does what its users need, even if it is in good condition. A low floor-to-floor height that cannot fit modern services. A deep floor plate in a world that values daylight. A building management system that cannot integrate with current controls. Lifts that are reliable but too slow and too few for current occupancy patterns. A warehouse with insufficient clear height for modern racking.

A building can be in good repair and still be obsolete. Condition ratings alone will not show it.

Functional obsolescence is harder to see because it is relative to expectations, which change. Its responses are upgrade, reconfiguration or change of use, and sometimes acceptance that the building serves a different market than it once did.

Economic or external obsolescence comes from outside the building. Regulation tightens, as with minimum energy standards for letting in Britain or emissions limits in some American cities. Valuers in the United States and under the International Valuation Standards usually call this external obsolescence. Energy markets shift, making gas-dependent plant less attractive. Demand moves, as with secondary office stock in some cities. Insurance reprices physical risk.

This kind of obsolescence can arrive quickly and without any change in the building’s physical state. It is the source of most talk about stranded assets, and it often shortens the economic life of systems that are physically sound, as Energy Becomes a Building Function describes for gas.

The three kinds of obsolescence leave different traces, but the market reads them together, and the clearest place to see that is vacancy by grade.

The South East figures are the starkest: Grade A space is almost fully let while Grade B vacancy is rising. Physical condition, functional fit and regulatory exposure tend to cluster in the same older buildings, which is why the gap between grades widens rather than closes as markets recover.

On a Moyne Ross register, physical obsolescence lives in the condition field. Functional and economic obsolescence surface elsewhere: in the action, where an upgrade replaces a like-for-like renewal; in the timing, where a regulatory date or a refrigerant phase-out brings a sound item forward; and in the cost basis, where the reason is stated in words. A reader can therefore filter the register for items driven by a changing world rather than by wear, and see how much of the programme each accounts for.

In some older buildings that share is large. It is also the part of the programme most open to judgement and to the owner’s intentions, which is why it belongs in the conversation rather than in a formula.

A capital plan that only reads physical condition will consistently misjudge timing for the other two. A chiller in fair condition may need replacement within five years because of its refrigerant. A sound office floor may need reconfiguration to remain lettable. A well-maintained building may need an energy upgrade to stay legally lettable.

In a Moyne Ross register, condition records physical state, while action, impact and timing carry the judgement about functional and economic obsolescence. Making that judgement explicit, with its reasoning in the cost basis, lets an owner see which lines are driven by wear and which by a changing world.