An important future market for Building-Integrated Photovoltaics lies not only in new buildings, but also in existing building renovation. Many urban buildings are entering cycles of façade renewal, roof renovation, energy retrofits and industrial park upgrades. If BIPV is introduced during renovation, building maintenance expenditure can be transformed into energy asset investment.
The IEA reports that buildings account for around 30% of global energy demand. In highly urbanized regions, new building area is limited, so energy retrofits of existing buildings may have greater impact. BIPV fits naturally with roof renovation, façade upgrades, shading system replacement and zero-carbon park development.
The key to BIPV in existing buildings is first determining whether the building is suitable. Roofs require assessment of structural capacity, waterproofing life, equipment shading and maintenance conditions. Façades require evaluation of curtain wall structure, orientation, shading, fire boundaries and visual requirements. Old factories also require checks on steel corrosion, roof panel life and wind resistance. If the building itself is unsuitable, installing BIPV blindly can turn an energy project into a building risk.
Urban renewal BIPV must also pay attention to construction organization. Many projects are located in operating factories, malls, schools or office buildings and cannot be shut down for long periods. Designs must consider phased construction, temporary protection, noise control, personnel safety and fire access. Module dimensions, installation methods and electrical connection should be standardized as much as possible to reduce site complexity.
BIPV should be treated as a value-added module in urban renewal, not as an isolated PV project. When owners plan roof waterproofing, façade upgrades or energy retrofits, they should evaluate generation potential and energy savings at the same time. In the future, companies that integrate building renovation, green certification, energy management and low-carbon operation will truly open the urban BIPV market.
