431 Architecture – three of the UK’s leading independent architectural practices form a new Alliance.

New venture sees Stride Treglown, Keppie Design and TODD Architects create a unique alliance, offering design excellence and collaboration across the UK and Ireland.



Having established that the approach and values of each business are very closely aligned, the directors see this Alliance as an opportunity to share knowledge and industry leading expertise, pool their substantial resources and provide a responsive local service for selected projects or frameworks right across the UK and Ireland.


Stride Treglown

Stride Treglown is a well-established architectural practice operating from studios in Bristol, London, Manchester, Cardiff, Solent, Bath, Plymouth, Truro and Abu Dhabi. Strides is an employee owned, multi-skilled practice with more than 300 people who specialise in architecture and interior design, masterplanning, urban design and town planning, landscape architecture and sustainability consulting, with expertise across all sectors, including education, healthcare, commercial, residential and transport.


Keppie Design

Keppie are one of the UK’s leading, independent architectural practices offering services in architecture, interior design and planning. Headquartered in Glasgow, the company employs over 100 people in studios based in Glasgow, Edinburgh and Inverness. Keppie count some of the UK’s top public and private sector companies amongst their Clients and operate across the UK and internationally.


TODD Architecture

TODD Architects is a client focussed Architectural practice that delivers high quality design solutions for our studios in Belfast, Dublin and London. Our commission base covers both public and private sectors with specialisations developed in office and workspace / healthcare / education / arts and cultural facilities / aviation. We are an AJ100 UK practice which, in addition to architecture, offers services in masterplanning, urban design, interior design and estate strategy / rationalisation.


The three practices – each one significant and established in their own right – emphasise that the Alliance is not a merger: they will continue to operate independently, combining forces only when opportunities to offer an enhanced service to new and existing clients arise.



With a broad portfolio of award winning projects covering all the key markets, including Healthcare, Education, Residential and Commercial property, the experienced and talented members of the Alliance will now be able to offer skills and services to clients across a much wider geographical area.



Paul Crowe

Paul Crowe

Director, TODD Architects View Details
Peter Moran

Peter Moran

Managing Director, Keppie Design View Details
David Hunter

David Hunter

Chairman - Stride Treglown View Details
Paul Crowe

Paul Crowe

Director, TODD Architects

T 028 9024 5587
M +44 7966 776619

Peter Moran

Peter Moran

Managing Director, Keppie Design

M 07733 232269

David Hunter

David Hunter

Chairman - Stride Treglown

T 07887 853803



This unique Alliance will give clients access to 15 studios covering the length and breadth of the British Isles and Ireland, from Inverness to Truro and London to Dublin. This combination would place 431 Architecture in the top five of the Architect Journal’s top 120, with over 500 people employed across the three practices.


England, Scotland, Ireland and Wales 


Stride Treglown, Keppie Design and TODD Architects


To deliver an excellent, responsive and approachable architectural design service.