In general, businesses which provide a service that does not result in a tangible good are exempt from sales tax, as it only applies to goods. For example a freelance writer or a tradesperson is not required to remit sales tax, although a carpenter making custom furniture is so required.
Sales tax generally does not apply to charges for installation labor. For example, tax would not apply to your itemized charges for installing a car stereo in a used car. Please note that it can be difficult to tell the difference between nontaxable installation and taxable fabrication on site.
In general, construction labor is not taxable. Installation labor of a fixture in most cases is also exempt from taxation, but the fabrication labor involved in the creation of a fixture is taxable.
In general, construction labor is not taxable. Installation labor of a fixture in most cases is also exempt from taxation, but the fabrication labor involved in the creation of a fixture is taxable.