It’s all about hiring the right skilled contractor to add value to your IT operations. Your in-house teams may be very skilled and expert but when you are adding new functionality / service for your business, it is always advisable to hire external resources to add that value. Your in-house teams are busy putting out daily fires and they get so used to your internal environment that its often times becomes difficult to think out of the box. That’s where an external contractor comes into play. 
Why do you need to add external contractors?
1. Innovation
2. Rapid delivery
3. Cost and Timeline Control
When do you need to add external contractors?
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Adding new service or product
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Internal teams are too busy putting out daily fires
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Lack of right skills internally
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Bringing fresh ideas into the organization