Many of my clients need a website for their business. It is a constant issue explaining to them that they do not need a gallery. If your business is not to sell your skills as a photographer. Then don't think that you have to have a gallery of your products or services.
Fact is in most cases this will prove to be the downfall of your website. If you are a contractor you don't need to have a gallery of every single project you have done. Although you could have some galleries, it is best to just show a few really good images of your finished work. You could have one or two of your more difficult projects that you are proud of in some sort of a display that will show the project from start to finish. Just keep it to a minimum and focus on getting the information to the potential customer that they really want to know.