Membership of Architecture for Humanity London has soared five-fold since the Boxing Day tsunami struck the Indian Ocean.
Numbers have increased from about 35 to 170 in the aftermath of the humanitarian disaster.
But the body, which belongs to New York-based charity Architecture for Humanity, is calling for more voluntary technical aid and money from British architects and designers to help it to rebuild infrastructure in devastated communities.
'We're not surprised that we have increased membership by so much. The tsunami is a terrible reminder of the power of tragedy that gets people into action. But it is great that people are interested, ' BDP architect Chris Medland, AFH London's coordinator said.
'The aim is that teams of volunteers will take forward the design of specific parts of the development, but the immediate need is for funds.'