Living history

Securing a future for the oldest building on the Parliamentary estate

Places for the community

From a derelict site to a thriving café

A contemporary extension

Stitching in new with the old

Reducing in-use energy

Installing solar panels atop a Grade I-listed Cathedral

Guiding change in heritage sites

A practical guide to managing change within a scheduled ancient monument

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.