Where to begin in adding-on to a house?

I am buying a frame house, and would like to expand the attic into living space (either by raising the roof or adding dormers). I know that I have unused FAR, and a structural engineer has said that the building is sound enough.

Where do I begin in this process — with an architect? Do I look for an architect that will do the whole thing from start to finish — ie draw the plans, get the permits and find the contractor? Or is it better to go to a contractor for the vision, and then shop around for a contractor who can also get the necessary permits?

I should mention that this is not a high-end project, I have a limited budget. But I want to do the work well, and legally.

Who in the chain is the one most qualified to get the permit — the architect, the contractor, the homeowner with an expediter?

Many thanks for your guidance.

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