WI Building Systems 25 years experience providing end-to-end modular and portable building solutions Get A Free Quote Free Quote / Contact Us Get in touch with the our team at WI Building Systems for an obligation free quote on any prefab and modular construction job no matter how big or small. Please enable JavaScript in your browser to complete this form.Name *FirstLastEmail *Phone NumberMessage *CommentSubmit Phone Number 03 9303 7879 Email sales@wibs.com.au Address 95 Yellowbox Drive Craigieburn Vic 3064