(CNN)It used to be that Ghanaians that wanted to study architecture picked a school in Europe or the United States. Returning, they'd bring foreign techniques, import foreign materials, and create foreign buildings, mainly in the Bauhaus style that dominated thrifty post-war Europe.

"Functional, buildable and economical," is how Akosua Obeng, a Ghanaian architect at Orthner, Orthner & Associates, describes the style.

Ghana's two architectural colleges are keen to impress upon its students the country's rich building heritage.

"You learn a lot about traditional architecture," says Obeng, "and you realize that we have a lot of good stuff that we didn't develop somehow; we left it by the roadside."

Local knowledge is informing the design work of local architects today, from color palettes to the types of materials used. One major change is the resurgence of wood -- mirroring a Western trend, but from distinctly Ghanaian roots.

"Wood is actually our material... we are in the forest belt," Obeng explains. "Wood is in abundance (and) we are known as a timber exporter. But the weird thing is that the knowledge to build in wood has disappeared," she says.

"From the colonial times we started building with concrete and block work... we just don't known how to do it any more."

By designing wooden structures, Obeng is reviving these lost skills. On one of her projects -- a block of townhouses with a wooden facade -- the architect has drafted in a retired German woodworker who Obeng says is "helping the locals and passing on the knowledge, bringing us back our wood knowledge."

"Many people think building a house with wood is impossible," says timber construction supervisor Latif Falicu. "This building has changed the architectural thinking of Ghana."

Meanwhile other architects are taking "homegrown" literally.

Frances Buckle-Thompson's sixth floor garden atop the World Bank in the capital is Ghana's first example of a green rooftop.