While modern Chinese architecture is nothing to write home about, Yunnan traditional architecture is actually quite interesting, making the best of local resources and climate for some quite comfortable buildings.

Zhu Liangwen:

The Dai, or the Tai and their Architecture and Customs in South China

Ronald G. Knapp and Terry E. Miller:

China's Covered Bridges

Architecture over Water

Detailed survey of China's covered bridges in many provinces, some sections about Yunnan's covered bridges.

中国乡土建筑:云之南 - Local Structures in China: South of the Yun Ridge (Yunnan)

Chen Yunfeng and Zhang Zuo:

云南明清民居建筑 Residential Houses & Buildings in Yunnan from the Ming and Qing Dynasties