At Cassion Castle Architects our practice philosophy is to employ surprise, ingenuity, realism, humour, and abstraction, to create architecture which is both user-friendly and conceptually rigorous. We believe in user-centred design, and in responding to the site. We generate the concepts for each project from these starting points. We then author and implement every aspect of a project in order to deliver innovative design solutions and high quality craftsmanship. Increasingly also our projects are also driven by issues of sustainability. Current projects incorporate many of the latest technologies to minimise energy consumption.

Cassion Castle Architects is unusual in being able to provide a complete and integrated design and build package. Our services include architecture, interior design, bespoke furniture, together with full project management and building services.  From inception through to post-occupancy, Cassion Castle Architects can deliver a complete built project. Our experience as both architect and contractor strengthens our ingenuity as designers and allows us the complete control required to guarantee delivering a project on time and within budget.

Cassion Castle began his training as an architect at Cambridge University, before completing a Masters degree at the Royal College Of Art. He worked for various architectural offices including Florian Beigel's ARU before forming Turner Castle in 2000. He subsequently reformed his practice as Cassion Castle Architects in 2006. A recently completed project is the Twofold House: a bespoke home and studio for two industrial designers in East London. This building has been short-listed at the RIBA London Awards 2009 for Best Residential Project and at the Grand Designs Awards 2009 for Best New-Build.


Studio 5

51 Derbyshire Street


E2 6JQ

+44 (0)20 7739 8266



Architects' Journal

Long Sutton Studio, Hampshire

16 May 2014

Long Sutton Studio

The Independent

Is This The New Face Of The Modern Home? by Oliver Bennett

5 November 2010

Twofold House

Architectural Review

Living in a Box by Rob Gregory

January 2009

Twofold House

Building Design

Cassion Castle Plans a Stealthy Citadel for Bethnal Green by Anna Winston

5 June 2009

Brick Studio

Architects' Journal

AJ Small Projects Part 2 

21 January 2010

Southend Soapbox


40 Fabulous Reasons To Be Exactly Where You Are...by Jonathan Bell

November 2009

Brick Studio 

Plan Magazine

Small Projects Part 1

January/February 2010

Southend Soapbox

Architects' Journal

Dunne Raby Studio by Sutherland Lyall

20 April 2007

Twofold House

Building Design

Village Pavilion Makes Its Debut

October 2009

Southend Soapbox

Total Production

Park Life With The Metal Gurus by Mark Cunningham

July 2009

Southend Soapbox


Bargain Basement by Grant Gibson

March 2007

McCann Erickson Headquarters


Take Slat by Jonathan Bell

October 2006

Slat House

Grand Designs Magazine

The Best Homes and Products of 2009 by Claire Barrett

July 2009

Twofold House


Extending Your Dreams by Chloe Scott

10 April 2007

The Slat House

Contract - Inspiring Commercial Design Solutions

Shiny and New by Danine Alati

May 2007

The Slat House

Business Life

Office of the Month: McCann Erickson

October 2006

McCann Erickson Headquaters


Steeling Beauty

October 2006

McCann Erickson Headquaters


Hidden Depths

April 2006

Opal House

Financial Times

Where the People Provide the Colour by Amelia Thorpe 

6 November 2005

Hecht Colin House

The Sunday Telegraph

Double Act by Elspeth Thompson

20 March 2005

Opal House

Building Design

Summerhouse: Stoke Newington, London by Graham Bizley

September 2004

Grand Designs

Simple, Sam Says by Lauris Morgan-Griffiths

April 2004

Hecht Colin House

Creative Base


March 2001

The Guardian Space

Young Guns go for it

February 2001


Studio Living by Tim Herbert

January 2001


2014 RIBA South Awards

Short-listed: Long Sutton Studio

2010 Architects' Journal Small Projects Awards

Short-listed: Southend Soapbox

2009 Grand Designs Awards

Short-listed: Best New-Build

for Twofold House

2009 RIBA London Awards

Short-listed: Best Residential 

for Twofold House

2008 Grand Designs

Short-listed: Best Renovation

for Opal House

2006 FX Design Awards 2006

Winner: Best Interior Workspace

for McCann Erickson

2004 Wood Awards

Winner: Best Timber Building

for construction of the New Summerhouse