When designing banners that exceed 3 meters (+-6ft) in width and height it's important to keep a few things in mind.

Graphic Design Tips for large banners:

• Work at the right resolution
  Your resolution should be at least 100dpi for good quality printing.
  


• Work in scales
  You can design your artwork in scales of the right size, e.g. 50%, or 25% of the original artwork, leaving it to the printer to print full size. At smaller scales, make sure your resolution is higher to compensate for loss of quality when scaling bigger.
  
  Keep your design simple
  Make sure that your branding is in tact and large enough to view from the desired distance. Don't clutter your design with too much images. People are only looking for a few seconds!!!