What economic factors or condition affect companies operating in construction industry?

Answer 1

Mostly GDP growth and GDP per capita (as conjucture in construction industry is highly correlated with economic growth), interest rates (cost of credits for companies and their clients), inflation (if costs of energy and materials rises so the costs of construction services grow as well -> demand for them falls), private income and investments volume (mainly government) (if higher -> demand rises). Interest rates and stability of exchange rates encourage more FDI so the cash from them may be transferred into construction industry.

Hope I'm right, I'm writing thesis about construction industry :).