Sage 100 Contractor (formerly Sage Master Builder) is a Windows-based integrated construction accounting platform aimed at small and mid-sized contractors, typically 5 to 50 users, who need real construction functionality beyond QuickBooks but do not need the scale of Sage 300 CRE or Viewpoint. It combines accounting, job cost, estimating, scheduling, service management, and payroll in one database.
For HVAC contractors, the service management module is the draw: dispatch, work orders, preventive maintenance contracts, mobile service, and flat-rate pricing sit alongside the GL and job cost, so service and project revenue roll into the same financials. Certified payroll, AIA progress billing, retainage, and change-order management are standard, as are the construction-specific financial reports (WIP, committed cost, over/under billings) that banks and bonding companies expect.
Pricing typically runs $115-$200 per user per month depending on configuration and hosting, with implementation and training adding $5K-$20K and first-year total cost often landing in the $10K-$50K range. Sage 100 Contractor is a strong fit for growing HVAC/mechanical firms that need full construction functionality but are not ready for an enterprise ERP. Cloud hosting through Sage partners is standard; a native cloud product exists separately as Sage Construction Management.