South East
London
DIA brings together unrivalled expertise and a pioneering spirit to unlock opportunities in the historic environment. Balancing tradition and transformation, we set the standard for what heritage can be—relevant, responsible and enduring. Our clients include custodians of the most significant historic buildings in the UK, commercial developers, preservation trusts applying for National Lottery Heritage Fund support, owners of country estates as well as local authorities.
As a BCorp-certified and employee-owned practice with national reach, we offer expertise in conservation, heritage consultancy, new design in historic settings, and townscape advice. We see the full picture—materials, history, evolving policy—bringing insight and precision to every project. Our collaborative approach bridges architecture, design, and heritage consultancy—uniting deep knowledge and a shared vision to create solutions that serve clients, partners, and communities.
Westminster Hall
Client: UK Parliament Strategic Estates
Type: Historic building conservation, repair, restoration and refit, conservation planning.
Link: https://dia.co.uk/project/westminster-hall-palace-of-westminster
Rochdale Town Hall
Client: Rochdale Borough Council
Type: Historic building conservation, repair and restoration, conservation planning.
Link: https://dia.co.uk/project/rochdale-town-hall
The Lord Leycester
Client:The Lord Leycester
Type: Enhance and refit, historic building conservation, conservation planning.
Link: https://dia.co.uk/project/the-lord-leycester
Name: Helen Ensor
Job title: Director
Tel: 01865 520170
Email: helen.ensor@dia.co.uk
Historic Building conservation YES
Conservation planning YES
Architectural design and new build in historic areas YES
Historical research YES
Historic area assessments YES
Project Management YES
Archaeology
Other