Why can’t you give me a price for solar over the phone?

Why can’t you give me a price for solar over the phone?

Everyone’s home set up is different. The price of your solar can be affected by: 
Government rebates and support schemes (these vary in each state)
Location 
o Heritage restrictions may be a consideration
o PV array frames must be wind rated for the site – additional roof fixing systems may be needed in high wind areas or cyclone zones 
o Roof space availability
Number of panels
Orientation of panels
Type of panels
Type of inverter
System design and configuration
Shipping costs for equipment and parts
Contractor installation costs
Removal of trees or other shading
Type of roofing: tile vs tin (Note: installs are not usually possible on a slate roof)
Height of roof (scaffolding may be necessary to comply with Australian WH&S standards)
Site preparation needs (for example, condition of roof or ground)
Switchboard age and capability – it may need upgrading / asbestos is sometimes present 
In rare cases where households have two meters, the connection fee can be higher.