Cat­ja de Haas Archi­tects is a small prac­tice that can design and deliv­er projects of very dif­fer­ent scales. The practice’s main focus is to make life bet­ter for peo­ple in their home and in the com­mu­ni­ty. We aim to make beau­ti­ful spaces and find the right cre­ative solu­tion for each of our clients. 

We work close­ly with our clients to under­stand their brief, pri­or­i­ties, timescales and the demands of the site – envi­ron­men­tal and plan­ning. We have expe­ri­ence with dif­fer­ent com­plex­i­ties of plan­ning, includ­ing a plan­ning appli­ca­tion in a con­ser­va­tion area of AONB. Because we are a small prac­tice each client receives expert advice, care and insight from a senior architect.


Our approach to a new project involves dif­fer­ent stages, start­ing with deter­min­ing what lev­el of ser­vice is required and organ­is­ing a fee pro­pos­al. After this ini­tial meet­ing an appraisal is tak­en encom­pass­ing the needs of the occu­pants, so that lay­outs can be flex­i­ble for now and in the future. We then pro­duce sketch­es, adopt­ing a cre­ative, flex­i­ble approach so that we can ensure we are all in agree­ment, before cre­at­ing doc­u­ments for planning. 


We have a breadth of expe­ri­ence, par­tic­u­lar­ly with the res­i­den­tial mar­ket. Cat­ja de Haas has a Phd in research into the Home and Hous­ing and teach­es archi­tec­ture at Bournemouth Uni­ver­si­ty. The teach­ing process enables the prac­tice to be cur­rent with meth­ods, insights and tech­nolo­gies required for good archi­tec­ture. The prac­tice is BIM ready. Along­side this aca­d­e­m­ic expe­ri­ence, is her per­son­al expe­ri­ence of under­stand­ing what it requires to make a suc­cess­ful home – her own home fea­tured in The Times Mag­a­zine – more infor­ma­tion on this link. She is well-trav­elled and has under­tak­en projects in a num­ber of coun­tries, as well as bring­ing up a fam­i­ly, work­ing from home and being a car­er for a fam­i­ly mem­ber. She brings these life expe­ri­ences into each project whilst respect­ing that we are all indi­vid­u­als with our own idiosyncrasies.


We have a good knowl­edge of sus­tain­abil­i­ty and can build to Fab­ric First or Pas­sivhaus stan­dards. We like to use local mate­ri­als when pos­si­ble and this love and under­stand­ing of mate­ri­als is evi­dent in our build­ings. Although every client is dif­fer­ent and each site has it’s own require­ments, we are always sen­si­tive to the land­scape and a sense of place, as well as under­stand­ing light, space and form. We like the places we design to have blurred bound­aries with the out­side, so that there is a rela­tion­ship between inside and out­side. Our aim is to bring all these areas togeth­er to cre­ate some­thing per­son­al and beau­ti­ful for our clients.


For an ini­tial con­sul­ta­tion con­tact us by tele­phone +44 7803627426 or email.


Stephen Fos­ter — Fos­ter Structures

Robert Chivers — Urban Green Artists

Anto­nio Moll — Moll Architects

Catja de Haas


Catja, PhD, RIBA, qualified as an architect at Delft University under Professor Herzberger. She also holds an MA in housing and Urbanism from the Architectural Association in London. Prior to setting up on her own she worked for Itsuko Hasegawa in Tokyo where she worked on projects in Japan and Malaysia, and Alsop Architects in London where she worked as a project architect on the Dutch projects. Between 2000 and 2005 she ran a practice, Studio CS, with Sabina Riss. In that time she built the house in France.

The home in miniature was the topic for her PhD by architectural design (supervisors Prof Jonathan Hill and Christine Hawley) which she finished at Bartlett school of Architecture, UCL, in 2013.

The prac­tice research­es the home and hous­ing while rais­ing aware­ness of home­less­ness and the refugee cri­sis through the Giant Dolls’house Project. The project is the result of her ongoing research into the use of imagination and miniature to explore the ideas of home and community participation as well as the dolls' house as a medium to bring about change. Catja has exhibited her own work and has presented her work at conferences and universities. She has been a visiting lecturer and crit at various universities.