The cost of professional installation will depend partially on the size of your fence. Professional installers usually charge more for smaller fences to compensate for the extra travel and set-up time. Prices will vary, but expect to pay between $65 and $100 per linear metre.efore you commit to DIY installation, be sure you are able to do the job. If you buy your Colorbond fencing and then decide to have it installed, you will probably pay around $50 per hour for installation. Your materials, too, will probably cost more than they would if you chose a Colorbond fencing supplier/installer.