Century-Old Neil Road Townhouse to Become Singapore’s First Energy Self-Sufficient Heritage Building

NUS ArClab transforms a 140-year-old Neil Road townhouse into an energy self-sufficient landmark using solar tech and innovative cooling tiles.

By: AXL Media

Published: Apr 29, 2026, 11:01 AM EDT

Source: Information for this report was sourced from The Straits Times

Pioneering Net-Zero Retrofitting in Singapore’s Heritage District

The historical landscape of Neil Road is poised for a technological transformation as a 19th-century townhouse prepares to become the first conserved building in Singapore to achieve total energy self-sufficiency. Occupied by the National University of Singapore’s (NUS) Architectural Conservation Laboratory (ArClab), the property at 141 Neil Road is being retrofitted to function with net-zero operational energy. This landmark project, scheduled for completion in late 2027, serves as a research model for over 7,200 other conserved buildings in the city-state, demonstrating that vintage architecture can meet modern environmental standards without losing its cultural identity.

Innovating Heritage Cooling Through Porous Roof Technology

A critical component of the building's thermal management involves a reinvention of the traditional V-shaped roof tiles. Sensors previously recorded surface temperatures as high as 58 degrees Celsius on the existing tiles, indicating a failure to reflect sufficient solar heat. In response, ArClab researchers collaborated with Japanese partners to develop a specialized porous tile inspired by 1880s handmade designs. These modern iterations are engineered to trap small amounts of rainwater, which then releases heat through evaporation as the tiles dry, naturally cooling the structure and reducing the energy load required for internal temperature control.

Scaling Solar Integration Within Conservation Guidelines

Achieving energy independence required a significant departure from standard heritage preservation rules regarding solar panel placement. Typically, conserved shophouses are restricted to covering only 30 percent of their rear roof slopes with solar arrays. However, the Urban Redevelopment Authority (URA) has granted ArClab additional leeway to maximize energy generation. By covering nearly the entire secondary pitched roof and the rear flat roof with panels, the facility is projected to generate 13 megawatt-hours (MWh) of electricity annually, exceeding its estimated operational needs of 12.4 MWh.