Refurbishing is not always the sustainable option, nor is demolishing the quick one. These are the variables we analyse before recommending a route.
The choice between refurbishing and demolishing is usually framed as an immediate financial question. That is a mistake: there are technical and regulatory variables that change the outcome completely.
Variables we analyse
Real structural condition
A visual inspection is not enough. We measure concrete strength, cover and carbonation. A sound structure can be refurbished; one with advanced corrosion may not be viable.
Regulatory constraints
An existing building may not comply with current regulations. Refurbishing means bringing it up to current safety and accessibility standards, and that is sometimes more expensive than demolishing.
Heritage and permit value
In consolidated areas, keeping the building can mean keeping planning rights that a new build would not obtain.
Waste cost
Demolition generates waste, transport and landfill. Refurbishing reduces that cost, but can increase the cost of structural strengthening.
Decision method
We assess the four variables and calculate the 30-year life-cycle cost, not just the initial investment. In many cases the cheapest option in the short term is the most expensive in the medium term.