We are conservation architects and heritage consultants.
For over 65 years we have pioneered a creative and pragmatic approach to managing change within the historic environment. 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. Proudly BCorp-certified.
Our portfolio
Creative conservation of a 1000-year-old cathedral
Chester Cathedral
From vacant offices to family home
Private House, Camden
Extending a Medieval home
Private House, Staffordshire
An accessible visitor shop and events space
The Undercroft, Hampton Court Palace
Townscape advice for a Modernist landmark
Space House
Services
Whether it is architectural or heritage consultancy services you are after, we offer practical and creative input that unlocks opportunities within your site.
Latest news
A tea house for all: The Camellia House at Wentworth Woodhouse wins 2025 Europa Nostra Awards
Planning application for London Liverpool Street transformation now validated by City of London
What clients tell us
" Creating an architectural project that embraces the need to be commercially viable, accessible, and compliant but is also sensitive to the age and architectural integrity of our site is a very difficult balancing act. The DIA team did their very best to try to balance these requirements and although compromises have had to be made, the end result is that we are more accessible, safer, compliant, repaired and with the potential to attract many revenue-bearing visitors to our Heritage site – one of the best and most important medieval sites in Britain – perhaps Europe. It is not an easy undertaking in such a complex and demanding architectural site for an architectural team and the DIA team performed this task with grace, compassion and integrity. "
Dr Heidi L Meyer, Master, Lord Leycester Hospital
Lord Leycester Hospital
Get in touch
We have studios in London, Bath, Birmingham, Chester, Conwy, Manchester, Oxford and York.