There are many people on the internet who call themselves web design companies. Some people do it as a hobby, or part-time. A fully functional web designer is the best way to do this.
Someone doing web design part-time takes it less seriously than someone doing it for a living. If you want to make your website more attractive, you should find the best web designers in NZ for the productivity of your business.
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Experience in each case
The web design company you choose for your project should have the appropriate experience. When designing an eCommerce website, it is best to choose a web designer whose portfolio includes an eCommerce website.
Beware of companies that don't give you formal contracts. The contract should state exactly what the web designer will do and how long it will take the price, and what you have agreed on.
A formal contract is the best way to avoid conflict between the web designer and you. Make sure your contract lists possible problems.
Different types of websites
There are significant types of websites such as e-commerce (with shopping carts), Static HTML (brochure type), databases, Flash, and websites with their own content management system. All of these should come into play when looking for a web design company.