The phrase "add costs" is correct and usable in written English.
You can use it when talking about increasing the monetary cost of something. For example, "The new regulations will add costs to production."
Managing intermittency while keeping the system reliable can add costs.
If so, will that add costs, rather than alleviating them?
Cuts in some areas will simply add costs in others.
These systems add costs and can break down over time.
And going green can add costs, at least in the beginning.
Any move by the N.C.A.A. to allow more food for athletes would add costs for colleges.
Those systems add complexity and weight, which add costs to planes, ships and tanks.
Additionally, third-party project managers and evaluators add costs to the services (Sanchez 2014).
But most of these steps add costs that many businesses can't afford or wish to avoid.
Strict border inspections would also add costs and cause delays in many cases.
This may add costs to the census, but it is not likely to produce inaccurate data.
