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
Townscape advice for a Modernist landmark
Space House
Study spaces for the next generation
The Jackson Library, Exeter College
Improving physical and intellectual access
Rochdale Town Hall
A revamped visitor experience
The Lord Leycester
A once-in-a-generation rescue
Wentworth Woodhouse, Rotherham
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
Insall practice director Cordula Zeidler joins the Historic England Advisory Committee
A lifetime of championing conservation: Sir Donald Insall awarded AYA Lifetime Achievement
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, Cambridge, Chester, Conwy, Manchester, Oxford and York.