GRIFFIN ISLAND - LISTED BUILDING RESIDENTIAL CONVERSION
Richard Watts • February 17, 2026
Gray stylized winged dragon emblem on a white background

PROJECT OVERVIEW

Spectrum Construction delivered the complex conversion of Griffin Island, a Grade II listed building, transforming a dilapidated collection of disused offices into a character-rich residential development. From the outset, the scheme presented significant heritage, technical and energy performance challenges, requiring a carefully balanced approach between conservation and modern living standards.

THE BRIEF

To repurpose a neglected listed building into high-quality city-centre apartments while preserving its historic character and achieving the minimum EPC standards required for rental properties.

HERITAGE-LED DESIGN

The design was developed in close collaboration with the conservation officer, resulting in apartments ranging from 50m² to 120m², each retaining individual character. A detailed heritage report and room-by-room schedule of works guided the project, reflecting varying levels of conservation significance throughout the building.

Conservation Detail & Craftsmanship

Each space required a tailored approach, with five different cornice moulds and joinery details varying from floor to floor. Original features were carefully retained and restored where appropriate, ensuring the historic integrity of the building was maintained.

Energy Performance & Acoustic Challenges

One of the primary challenges was achieving the required EPC rating while reinstating traditional lime finishes. City-centre noise pollution added further complexity, requiring solutions that addressed both thermal and acoustic performance without compromising breathability.

Innovative Conservation Solution

A specialist system known as Warmshell was adopted, widely used on conservation projects across England. The breathable wood fibre board system (40–80mm thickness, determined by existing building fabric) was installed to prevent condensation, finished with two coats of lime plaster and Eco-pro breathable emulsion.

Industry Recognition

Lime Green–Warmshell has since expanded into Wales with support from Chartered Institute of Building, with Griffin Island identified as a flagship project for future large-scale conservation-led developments.

THE RESULT

A successful transformation of a challenging listed building into modern, lettable apartments that combine heritage integrity, energy efficiency and contemporary living standards.

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