Is it cost efficient to have your own Logistics company to do your distribution than to outsource from external firms?

Outsourcing can help a business focus on its core components without distractions from ancillary and support functions.

First it depends on the environment some will favour outsourcing why others building your own  , but in the long run better to build and follow up 

I think the solution is to outsource the transport business becaufe the load is not continuous and the company can not provide operating budjet while the activity is down

More than cost effecient,it is better to keep focus on mainataining the comapny's business at its highest level,By providing quality service to its customers.if outsourced we will not have control over its operations and service. 

Outsourcing distribution clearly has significant potential for many companies seeking to re-ignite growth in a global economy still struggling to find its footing. Doing so not only allows them to focus on their most differentiated capabilities, but also gives them access to world-class, lower-cost distribution capabilities on a flexible and scalable basis. 

I agree with Jefferson, there is always a choice 'make' or 'buy'.You must also consider the time needed to build your own logistics company and elasticity in selecting/changing outsourcer. Here appears additional question: Cost effectiveness is your the most important goal or just one of your goals?

Starting with outsourcing and need to build own network for distribution 

It's a very complex question but I think, building your own Logistics company requires you more money  or capital in putting it up. You also have to consider the operating cost of the business, but if the Profit exceeds the expenses in the latter, then it would still be a good decision.