What is a BMS points schedule and why does it take so long

An explainer for anyone outside the BMS industry who needs to understand what a points schedule is, why it matters for pricing, and why producing one manually takes 2-3 days per tender. Written for M&E contractors, main contractors and property developers who receive BMS quotes but don't fully understand what goes into them.

What a points schedule is

A BMS (Building Management System) controls and monitors the mechanical and electrical equipment in a building. Each piece of equipment connects to the BMS through a set of physical or digital points. A points schedule is a list of every one of those connections.

There are five types of point:

• AI (Analog Input) — a continuous measurement. Temperature sensors, flow rates, pressure readings.
• DI (Digital Input) — an on/off status. Pump running, fan fault, filter alarm.
• AO (Analog Output) — a continuous control signal. Valve position, fan speed, damper position.
• DO (Digital Output) — an on/off command. Pump enable, fan start/stop.
• HL (High Level) — a software integration via BACnet or Modbus. VRF controllers, chiller interfaces, meter readings.

Why it determines the price

The number and type of points directly determines what hardware is needed, how much wiring and installation labour is required, how long commissioning takes, and how much software development is involved. A small school might have 200 points. A large hospital can have 10,000 or more.

Why it takes so long

Producing a points schedule means reading every document in the tender pack — mechanical specifications, equipment schedules, schematics, floor plans — and identifying every piece of equipment that needs a BMS connection. Then for each item, determining which points it requires based on its type, the specification requirements, and the control strategy.

This is not just counting. It requires understanding what each piece of equipment does, how it is controlled, and what level of BMS integration the specification requires. That understanding is why it takes a senior engineer 2-3 days per tender, and why it is one of the most time-consuming steps in the BMS tendering process.