
Westminster Hall Conservation Project
Westminster, Greater London
Westminster Hall exemplifies the pinnacle of historic building conservation, combining meticulous research, traditional craftsmanship, and innovative techniques to preserve a medieval architectural masterpiece for future generations. Its enduring significance to British public and political life underscores the profound benefits of such endeavours, not only for the community but also for its users. The conservation techniques employed adhered to a philosophy of minimal intervention, prioritizing the retention of original materials wherever possible. The project demonstrated respect for historical integrity by using like-for-like materials and traditional methods. For instance, damaged stonework was replaced only when structurally necessary, with Bath, Cadeby, and Chilmark stones carefully matched to the medieval masonry. This approach ensured that the building’s fabric remained authentic, balancing preservation with functionality. Techniques such as lime mortar and shelter coating further prolonged the life of the stonework while maintaining its historical character. The cleaning and repair of the 14th-century hammerbeam roof showcased exceptional innovation and expertise. The structural instability caused by deathwatch beetle damage was addressed with reversible and honest repairs using traditional carpentry joints and English Oak, ensuring long-term stability while honouring historical practices. Similarly, the redesign of the lantern with sand-cast lead addressed modern challenges, such as rainwater drainage, without altering its historical appearance. This dual focus on preservation and modern functionality highlights the sophisticated balance achieved throughout the project. The conservation also prioritised accessibility and community engagement. Temporary interpretation and scaffold tours transformed the restoration into a learning experience for visitors and stakeholders. The Hall remained open to the public throughout the works, embodying the democratic ethos of accessibility to Parliament. This commitment reinforced the Hall’s role as a living part of British heritage, not merely a preserved relic. The addition of the Jubilee Window exemplified thoughtful enhancement, providing a contemporary feature that complements the Hall’s storied history. The involvement of apprentices and on-site workshops cultivated traditional skills, fostering a new generation of craftspeople and ensuring the continuity of conservation expertise.
Judges’ Comments:
“Westminster Hall’s restoration demonstrates the profound benefits of historic building conservation. By preserving the Hall’s architectural and cultural legacy, the project enriches the community’s connection to its history while providing an enduring, functional space for public and political life.”




















Photography Credits & Captions
Overall Result
Award
Application Type
Conservation
Primary Use Class
F1(e) Public halls or exhibition halls
Secondary Use Class
E(g)(i) Offices to carry out any operational or administrative functions
Credits
Lead Consultant & CDM Principal Designer
Donald Insall Associates
Client
UK Parliament
Structural Engineer
Alan Baxter Ltd
Quantity Surveyor
Huntley Cartwright
M&E Engineers
BDP
Archaeologist
Wessex Archaeology
Phase 1 (North Wall)
Skillington Workshop
Phase 2 & 3 (Internal Masonry)
DBR London Ltd
Phase 3 (Roof and Lantern)
Mitie
Phase 3 Lead work
DBR Leadwork
Phase 3 Conservation carpentry (Hammerbeam Roof & Lantern)
Dolmen Conservation Carpenters
Carpentry (Lantern Vaulting)
Sands & Randall Carpenters
Phase 1,2 & 3 Window Glazing (including the Jubilee Window)
Reyntiens Glass Studio