Take a look at all the different services that can be offered:
The most important type of service has to do with the heart of the power in your home. All of your power is hooked up to a breaker box, or multiple breaker boxes, which then are fed to a main line that is ran by your power company. Within these breaker boxes you have the ability to add in additional power for a home addition, new garage, or for any other reason that might come up. This is also a common repair that is done in residential homes as well because breakers sometimes can become burnt out or damaged during a storm.
One type of custom electrical service that is offered is by wiring an exterior lighting system at your home. This can add security to the exterior of your home, and can add in complimentary lighting into your landscape. You can also have a sound system wired for the outside of your home that works well with family get-togethers and parties alike.
For the interior of your home you can have custom applications installed all over. If you are planning on putting in a theater room, this will have to be properly wired in. The same goes for an intercom system, additional lighting, or any other type of upgrade that is common in homes. Having these specialty items wired properly will guarantee that they actually function properly after being installed.
Adding in a pool or hot tub requires additional wiring and power to operate correctly. A pool will have a full pump system and possibly a heating system that will need its own breaker and wiring. The same goes for a hot tub, or any type of outside water attraction you can have installed at your home, like a fountain. This is just an example of another service that can be performed by an electrician at your house.