When you have a project that needs the right voice casting, an agent is going to be the best resource for you. Agents have extensive knowledge about the artists they represent, especially if you want to hire an artist with a specialty -- such as a Spanish voice talent or an artist who is particularly good at character work.
Senior casting agents use their vast realm of experience to match commercial voice talent with the jobs that will give their clients the absolute best fit possible. Their insight into the different aspects of commercial voice work is a priceless contribution in matching the right talent with the right projects.
Voice over agents can also offer the options of having talent record and send in auditions or do them in person.
I was completely blown away by the professionalism and connections that the commercial voice casting agent had!
The agent I worked with went to great lengths to match me with an amazing commercial voice artist. I couldn't be more satisfied.
While many agencies do offer commercial voice services, there are many that do not. You simply have to research agencies to find out which ones do and don't and also which of the ones that do have the ability to most closely meet your needs and expectations.
Some agencies specialize in casting commercial voice artists while other, larger agencies may only have an agent or two who works with commercial voice casting. Since there is no visual element involved when hiring a commercial voice over actor or actress, agents may actually spend more time casting those jobs to ensure that they have the best voice for the gig.
Is the agency reputable? Are they SAG and AFTRA franchised even if your project is non-union
The most important thing about using casting services is making sure that you've approached a reputable agency. Reputable agencies will never ask for fees when setting up auditions for your project or when casting an artist in your project. Agents are expected to adhere to certain guidelines, and the industry standard is for agents to receive approximately 10-15% of the artist's pay for a project. If this isn't how the agency you're working with operates, then you may want to find another talent agency to cast through immediately!
Reputable agencies should be able to cast both union and non-union projects. The agency should represent performers who are members of SAG-AFTRA. If this organization refuses to recognize a talent agency, that is a good clue that it is not an agency that you want.