The phrase "are needed to build" is correct and usable in written English.
It can be used when discussing the requirements or components necessary for constructing something, whether it be a physical structure, a project, or an idea.
Example: "To create a successful marketing campaign, several key strategies are needed to build a strong brand presence."
Alternatives: "are required to construct" or "are essential for developing".
Access is always critical, so once again engineers are needed to build roads or in some cases temporary landing strips".
The trouble is, she adds, such a baby will not have the contact with germs that are needed to build up a strong immune system.
It's easier for the U.S. government to leave them to their fate while telling itself that "the good Iraqis" are needed to build the new Iraq.
At the General Motors plant in Lake Orion, Mich., robotic carts move parts to the line as they are needed to build the popular Chevrolet Sonic subcompact car.
Some, such as Times columnist Matt Ridley, argue that the movement is unethical on poverty grounds, because fossil fuels are needed to build the economies of developing countries.
The first gig featured 15 musicians, though Riley now thinks 25 to 30 are needed "to build up the right wall of sound".
They started a community-owned store, which sells assorted sundries, with the support of some local shopkeepers, who say that a variety of enterprises are needed to build customer traffic and keep the town's businesses alive.
"Prime Minister Netanyahu and others have been saying loud and clear that according to Israeli law Jerusalem is sovereign Israeli territory, so no special commissions are needed to build within the municipal borders of Jerusalem.
Especially as math and reading squeeze other subjects from the curriculum, after-school programs are needed to build children's character, confidence, civic awareness, athletic prowess, and artistic and musical sensibility.
How many more lives are needed to build the Empire?" she wrote.
--Time, energy, anumberumber of dedicated enthusiasts are needed to build up new, interdisciplinary ventures.
