St Margaret's Residences, Exeter

Overview:

Originally founded as a boarding school in 1902 by Miss Bessie Jago, St Margaret’s School in Exeter flourished for over a century before closing its doors in the 21st century. Over 100 years later, Grenadier — a developer renowned for its sustainable approach — has transformed the site into St Margaret’s Residences, a collection of luxury, energy-efficient homes that prove period properties can rival new builds for performance.

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Challenge:

Redeveloping historic buildings into modern, energy-efficient homes posed a unique challenge: preserving the period architecture and character while achieving contemporary standards of comfort, sustainability, and efficiency. The solution needed to integrate discreetly with the existing structures without compromising aesthetics or heritage features.

Solution:

To provide efficient, sustainable heating across the residences, a hybrid heating system was designed and installed, combining the reliability of gas with the low-carbon efficiency of heat pumps.

System features:

• Cascade of four custom-optimised MasterTherm AquaMaster Inverters (AQ90i)
• Hybrid configuration to complement existing gas systems
• Supplies heating to multiple residences across the development
• Seamless integration into the building design to preserve historic aesthetics
• Works alongside other renewable technologies including solar thermal systems

Key Benefits:

• Energy-efficient hybrid system combining renewable and traditional heat sources
• Reduced carbon footprint and improved overall energy performance
• Discreet installation preserves historical integrity and period features
• Complements other sustainable technologies such as solar thermal and EV charging
• Demonstrates how heritage buildings can achieve modern energy standards
• Supports Grenadier’s commitment to sustainable redevelopment

Results: 

• St Margaret’s Residences sets a new benchmark for period home efficiency
• Heating and comfort levels enhanced while maintaining historic charm
• Hybrid system ensures reliable, low-carbon performance year-round
• Supports Grenadier’s mission to blend heritage with sustainability

Client Feedback / Quote: 

"Our vision for St Margaret’s was to honour its heritage while demonstrating that historic properties can lead the way in sustainable living. The hybrid heat pump system played a vital role in achieving that balance." – Grenadier Developments