Is a lawyer needed for a variance or rezoning change?

Maybe. If the variance or rezoning change that you have in mind is fairly uncomplicated, on a small scale, and does not negatively affect neighbors (and you have established good rapport with your neighbors and the zoning authority), you may not need a lawyer.

On the other hand, definitely get a lawyer who knows local zoning and the local officials should the plans you have in mind call for a significant, complex change to your property or you anticipate a rowdy, heated hearing with your neighbors. An attorney can hash out some of the issues and make recommendations in advance, help prepare your presentation before the zoning board, or advise you on the best means to comply with any special conditions. Experience often is critical.