About Us


PHASE3 is an innovative international architecture and design practice based in London. We believe that approaching projects in strategic and playful ways leads to original schemes that regularly exceed our clients’ expectations.

Being Contemporary
As a forward-thinking practice we combine each team member’s skills and abilities to deliver the best outcomes across a variety of sectors including residential, office, retail and masterplanning. Our talented design team is able to approach each project in a new way, creating fresh and original ideas. We believe that high quality design, when combined with thoughtfulness, can be delivered within almost any constraint.
Work Ethos
We believe in building long lasting relationships which are the basis for delivering well-crafted buildings. Our proposals are based on analysing and thoughtfully addressing our clients’ needs to deliver meaningful projects. Our aim is to create forward-looking buildings that continue to remain a long term asset, increasing in value for future years.


TYEN MASTEN – Director

M_Arch University of California, Los Angeles

Tyen Masten is the director and founder of PHASE3. He set up the practice with the aim to collaborate on projects which vary in scale and complexity. His work is grounded in a practical approach to applying digital technologies towards the production of thoughtful architecture. Combining practice with research and teaching Tyen has developed extensive experience in academia.

Tyen Masten has 25 years’ experience working in the field, collecting experience on several UK and overseas projects. His experience ranges over a variety of project types, from small scale developments over office towers, museums, hotels to masterplanning, including the highly acclaimed Riverside Museum in Glasgow.

Click here to see a full list of Tyen’s previous work




Johannes Schick
Theo Petrides
Megan Montague
Ioana Man
John NG

Full Projects List


London, UK

Brooks Creek 2015 – ongoing Pacifica, CA Residential / Masterplanning
New Cyprus Musum 2017, Competition Nicosia, Cyprus Cultural / Museum / Masterplan
Wester Ross Visitor Hub 2016, Competition Highland, Scotland Public Space / Tourism
NLA – New Ideas for Housing Nov 2015 London, UK Housing Ideas Competition – Shortlisted
Ironbridge House 2015 – ongoing London, UK Residential Conversion
Windmill Place 2015 London, UK Residential Re-Development
Swim Wear with Syndicut London 2014 London, UK Fashion Collaboration
The Tannery 2014 – ongoing London, UK Residential / Commercial
Broadway Plaza 2014 London, UK Residential / Commercial
Chelsea Square 2014 – ongoing London, UK Residential Entrance
Putney Wharf 2014 – ongoing London, UK Residential / Commercial
Putney High Street 2014 – ongoing London, UK Residential / Commercial
Hardwicks Square 2015 London, UK Residential Conversion
Natai Beach Development 2014 Natai Beach, Thailand Luxury Entertainment
The Life Above 2014 Dubrovnik, Croatia Luxury Residential & Entertainment
Compayne Gardens Residence 2013 – 2014 London, UK Residential
Khaitan Masterplan 2013 Kuwait City, Kuwait Masterplanning, Mixed Use
Old Brompton Residential 2013 London, UK Residential
Juice Rodriguez 2013 – 2014 Barcelona, Spain Retail
Ladbroke Road Residence 2013 London, UK Residential
Twyford Avenue Residence 2013 London, UK Residential
Sama Mall 2013 Kuwait City, Kuwait Retail
Notting Hill Residence 2012 London, UK Private Residential
Midhurst Road Residence 2012 London, UK Private Residential
Southampton Road Residence 2012 London, UK Private Residential
The Gate Mall 2012 Kuwait City, Kuwait Retail