Why Energy-Efficient Buildings Are Creating a Hidden Connectivity Crisis

There is a performance problem quietly accumulating across London's commercial property stock and it has nothing to do with structure, design or maintenance.

As the pressure to meet net zero buildings targets intensifies, the specification of high-performance glazing and advanced insulation materials has become standard practice across the sector. These are the right choices. Low-emissivity coatings, thermally efficient facades and high-density building envelopes are essential tools for reducing operational carbon, improving EPC ratings and meeting the tightening Minimum Energy Efficiency Standards that the LCCI's Commercial Retrofitting in London report confirms will require EPC C compliance by 2027 and EPC B by 2030. Approximately 70% of London's commercial stock is currently at risk of non-compliance with those thresholds.

What is less well understood is that these same materials carry an unintended consequence. The metallic coatings embedded within energy-efficient buildings glazing - the Low-E layers that reflect heat and reduce energy consumption also attenuate radio frequency signals. The effect is well established in physics: when a building's envelope becomes sufficiently conductive, it begins to behave like a Faraday cage, reflecting rather than transmitting electromagnetic waves. The result is compromised indoor mobile coverage, reduced wireless performance and unreliable network accessibility for everyone inside.

This is not a telecoms problem. The external signal infrastructure is functioning. The issue lies within the building envelope itself - a building performance challenge that sits squarely within the remit of property directors, asset managers and facilities heads.

The commercial implications are material. Tenants in offices, hotels and multi-occupancy residential developments increasingly treat reliable indoor connectivity as a baseline expectation rather than an amenity. Where that expectation is not met, the consequences compound: occupier dissatisfaction, lease renegotiation risk and, as ESG due diligence becomes more rigorous, potential erosion of asset performance and valuation. The LCCI report notes that retrofitted buildings with measurable performance improvements are already commanding increased investor attention and, in some cases, higher rental yields. The inverse is also true - buildings that underperform against occupier expectations face growing commercial exposure.

The conventional response has been to install active systems: Distributed Antenna Systems (DAS), repeaters or small cells. These approaches work, but they introduce significant cost and complexity. Active systems require power, ongoing maintenance contracts, carrier-by-carrier coordination and, in occupied buildings, disruptive installation. They also carry inherent obsolescence risk - infrastructure installed for 4G may require modification as 5G and future network evolutions roll out.

WAVETHRU, deployed in the UK by INCO Robotics, takes a fundamentally different approach. Rather than adding infrastructure, it modifies the source of the problem directly. A laser-based treatment is applied in-situ to existing glazing, creating invisible micro-patterns in the Low-E coating that allow signal penetration through glass without compromising thermal performance or aesthetics. The result is a passive connectivity solution - no hardware, no power consumption, no maintenance, and universal compatibility across all operators and network generations including 4G, 5G and critical communications.

Proven across more than 100 buildings in Europe, the intervention is delivered without window replacement and without disruption to occupants, a critical consideration for the occupied buildings that make up the vast majority of London's commercial stock.

For property directors and asset managers navigating both tightening energy standards and rising occupier expectations, the question is no longer whether building performance includes connectivity. It does. The question is whether to address it reactively, with costly active infrastructure, or proactively, through precision robotics and passive technology solutions that solve the problem at its source.