Consultant's GST charges BC

I'm in B.C. and my company provides consulting / management services. I charge a monthly fee plus an administration fee. The clients are in B.C.  Do I charge BC HST on both charges or just on the consulting fees? The admin fee is typically $500/mo on top of the consulting fee and is basically a fixed fee that covers a portion of office costs - office supplies, Internet, specialized software licenses and maintenance, phone, fax, specialized equipment that I supply as part of the service, etc.  Any help would be much appreciated.