ANSWER: Permits are required for all of the work necessary to build a swimming pool. In LA County, there are two ways to approach the required permits. The first, and most popular, option is to obtain a Combination Swimming Pool Permit.This Combination permit covers the construction of the swimming pool as well as the electrical, plumbing, and mechanical work directly related to the construction of the swimming pool.he first, and most popular, option is to obtain a Combination Swimming Pool Permit. This Combination permit covers the construction of the swimming pool as well as the electrical, plumbing, and mechanical work directly related to the construction of the swimming pool.