About Us

An award-winning multi-disciplinary planning and design practice based in Liverpool. We offer an integrated range of services with specialist expertise embracing architecture, planning, landscape architecture, masterplanning, and conservation.

Our Approach

We offer integrated specialist expertise in architecture, town planning, landscape architecture, masterplanning and conservation. Since 1983 we have successfully completed over 1500 commissions, and won more than 60 awards, for clients across a wide range of sectors. We take an intensely client-focussed approach to our work and have been very successful at creating and releasing value for our clients. At Cass Associates we strive to create communities, environments and buildings that enhance people’s lives and provide lasting value for our clients.

Client List

Private Sector

Alps International – Bluemantle – BAE Systems Properties Ltd – Balfour Beatty – Barratt Homes – Beers Timber and Building Ltd – Bellway Homes Ltd – Compton Verney House Trust – Dandara – Emerson Group – Floating Concepts – Geraud UK Ltd – Hoddom & Kinmount Estate – Kier Construction – Knowsley Safari Park – Lhoist UK Ltd – Malcolm Reading Consultants – Manchester Airport plc – Merseytravel – Mirrlees Fields Action Group – Nestle UK – Npower – Olleco (formerly Agri Energy Ltd) – Orica (UK) Ltd – Peel Environmental – Persimmon Homes Ltd – Pilkington (UK) Ltd – Redrow Commercial Developments – Redrow Homes – Road Range Mercedes Benz – Rowland Homes – RWE Innogy plc – Shepherd Construction – Taylor Wimpey – UK Coal and Harworth Estates – United Utilities Property Services – Wainhomes Ltd – Wates Construction

Voluntary/Charity Sector

Augustinian Canonesses – British Waterways ( Canal and River Trust) -Deane Road Cemetery Committee – Dingle 2000 – Heritage Works Building Trust – Liverpool Biennial – National Trust – Mersey Forest – Mersey Waterfront Partnership – The Reader Organisation

Public Sector

25+ Local Authorities across the UK – 15+ Regeneration Agencies across the UK – The Design Council (formerly CABE) – English Heritage – Lancashire Fire and Rescue Service – Liverpool Housing Trust – Duchy of Lancaster – North Claines Parish Council – Mersey and Red Rose Forests – Merseyside Fire and Rescue Service – Mersey Basin Campaign – Scottish Enterprise – Scottish Executive – Emscher Park IBA, Germany – Grimethorpe Regeneration Executive Groundwork – Kensington Regeneration – King David Primary School – Lairdside Regeneration – Liverpool John Moores University – Liverpool Land Development Company – Liverpool Sailing Club – Liverpool Vision – Longley Park College – Mersey Waterfront Partnership – Merseyside Development Corporation – Merseytravel – North Hartlepool Partnership – North Liverpool Partnership – North West Development Agency – Shorefields Technology College – University of Leeds – University of Liverpool – Villages Housing Group – Wales Tourist Board – Welsh Development Agency – Wirral Metropolitan College


We are members of the following professional organisations and are fully accredited for quality assurance under the ISO: 9001 2015 standard for Quality Management.

Landscape Institute Registered Practice

RIBA Chartered Practice and Accredited Conservation Architect

RTPI Registered Planning Consultancy

The Green Register of Construction Professionals

Key People

Our clients tell us that our people are our greatest strength. Each project, regardless of size, is led from inception to completion by a member of our senior team, who will remain your key client contact.

Graham Trewhella


Graham has comprehensive experience of planning practice in both the private and public sectors. Specialising in large regeneration projects for major clients, Graham is experienced across all aspects of town planning practice and the management and implementation of complex projects.

Richard Roberts

Architecture, Urban Design and Conservation

Richard has been responsible for a diverse range of projects across different sectors including large-scale masterplanning, commercial, retail and residential developments. Richard is an accredited Conservation Architect and also leads studioCass, our bespoke residential service for private homeowners.

Andrew Wright


Andrew has skills in concept design, feasibility studies, detailed design and contract administration. With a thorough knowledge of construction and excellent communication and organisational skills he has overseen a wide variety of architectural projects, with a particular focus on community and conservation.

Kate Da Cruz

Landscape Architecture

Kate has extensive experience in all aspects of landscape design and management including working on many large-scale, complex landscape projects within multi-disciplinary teams. With a background in ecological design she is now a leader in the emerging markets of soil manufacture and green infrastructure assessment.