Horizon Services Company is New England's leader in facility cleaning services. To our customers we are a single source services provider capable of delivering industry leading facility services and professional construction management & labor. Horizon Services Corporation is comprised of: Horizon Facility & Maintenance Services: ISSA Certified contract cleaning solutions including janitorial services & special project services, landscaping & general maintenance. Horizon Office: Superior quality office furnishings and professional moving services for corporate environments. HS Supply: Janitorial & MRO supply.