Electricity Sub-Meters per Room
Fair Billing for Room Rentals (2026)

Why landlords sub-meter rooms

In a house or condo let room by room, one TNB account covers everyone. The easy answer is to split the bill equally, and it works until one tenant runs the aircon all night while another is away most of the week. The aircon is the biggest variable load in a Malaysian bedroom, so the gap between rooms can be large, and the argument comes back every month.

A sub-meter on each room settles that with a number. Each tenant pays for the electricity their own room uses, and the shared areas (kitchen, living room, water heater in the common bathroom, corridor lights) are split between everyone. It also gives the landlord early warning: a room meter that keeps running while the room is empty points to a faulty appliance or a fault worth checking.

ClickBina's room-rental conversion guide covers the partitions, locks and fire-safe layout of a room-rental house; this page covers only the metering and billing of electricity.

How a room sub-meter works

TNB's meter at the front of the house is the revenue meter: it measures everything and it is the only reading TNB bills. A sub-meter is your own meter, fitted after it, on one branch of your own wiring. It measures the energy on that branch in kWh, the same unit printed on the TNB bill.

A sub-meter does not change the bill or the tariff; TNB still bills the account holder for the total. It only tells you how to divide that total fairly. The same principle applies to water, which ClickBina's water meter and submeter guide explains in detail, including how the sub-readings are reconciled against the main meter.

Types of sub-meter for rooms

There are a few practical choices. They differ in where they sit, who reads them and how much wiring they need.

Whatever the type, choose one rated for the circuit it measures and made for fixed installation in a distribution board, not a gadget meant for a desk. A prepaid meter cuts the room's power when credit runs out, so agree in writing what stays on (for example a fridge on a shared circuit) and how quickly power returns after a top-up.

Where it is fitted: the circuit question

A sub-meter measures only the cables that pass through it. In many terrace houses and older condos the rooms were never wired as separate units: one socket circuit may feed two bedrooms and the corridor, and lights for a whole floor share one breaker. A meter on that circuit would mix two tenants together.

Before buying meters, have an electrician trace the circuits and mark which breaker feeds which room. Aircon units are usually on their own circuits already, which makes them easy to meter. Sockets and lights often need re-arranging so each room's points come back to one breaker, and the DB may need spare ways or a small extra board. ClickBina's DB box size guide explains ways, spares and when a board is already full.

The simpler route: meter only the aircon

Because the aircon is most of the difference between rooms, many landlords meter only the aircon circuit in each room and split everything else equally. It needs far less re-wiring, since each aircon is normally a dedicated circuit, and it removes most of the argument.

A plug-in smart plug with energy monitoring can measure a portable aircon, a fridge or a heater that plugs into a socket, but it cannot measure a split unit wired to a fixed point, and a cheap plug running a heavy load near its limit gets hot. Use one only within its rating, and treat it as a measuring aid, not part of the building's wiring.

Setting a fair rate per kWh

The fairest method is to charge each room at the same average rate you actually pay. Take the TNB bill for the month, divide the total amount by the total kWh on it, and that is your rate. Multiply each room's kWh by that rate; the balance is the shared use, split equally.

1. Read every sub-meter on the date the TNB meter is read, or as close to it as possible.
2. Work out each room's kWh used since the last reading.
3. Divide the TNB bill amount by the TNB kWh to get the month's average rate.
4. Charge each room its kWh at that rate.
5. Split what is left (common areas) equally between the rooms.
6. Show the tenants the calculation with the bill, every month.

Tariffs and bill components change, so the average rate moves from month to month; work it out from the bill each time instead of fixing a number in the agreement. ClickBina's guide to a sudden high electricity bill explains how to read kWh on the bill and what makes it jump.

Put it in the tenancy agreement

A sub-meter only prevents disputes if the agreement says how it will be used. Write it in before the tenant moves in:

• Which meter belongs to the room, and its reading on the move-in date, signed by both sides.
• The reading day each month and who reads it.
• How the rate is worked out (the average-rate method above) and how shared use is split.
• When payment is due, and how it is recorded.
• For prepaid meters: who tops up, what happens when credit runs out, and what stays on.
• Access to the DB for readings and checks, and the final reading on move-out.

The HMO and co-living guide covers the wider rules for letting rooms, including strata by-laws and local-council limits, which apply whether or not you sub-meter.

Reading, recording and checking the meters

Keep a simple monthly table: date, each room's reading, the TNB reading and the bill amount. Add up the room usage and compare it with the TNB kWh. The difference is the shared use plus small meter differences. If the room meters suddenly add up to more than the TNB meter, a meter is faulty or wired wrongly; if the shared share jumps, look for a fault or an appliance left on in a common area.

What the electrician must do

Fitting meters in the DB and re-arranging circuits is fixed wiring work. In Malaysia it should be done by a competent electrician registered with Suruhanjaya Tenaga, who tests the work and labels the board. Ask for each room's meter and breaker to be labelled clearly, the RCCB tested after the work, and a simple schedule showing which circuit feeds which room.

If the house wiring is old, check it before adding meters and splitting loads; ClickBina's electrical safety inspection guide explains what a basic check covers. Several tenants running aircon at the same time also tests the main supply, so ask the electrician whether the board and incoming supply can carry the total load.

What the related work costs

Meter prices vary with the type and features, so ask for the meter model and price in the quotation. For the electrical work around the meters, these are the ranges ClickBina's guides publish (indicative 2026, Klang Valley).

Metering only the aircon circuits usually costs far less than re-wiring every room as a separate unit, because the aircon circuits are normally already separate. Price both options before deciding.

How ClickBina can help

WhatsApp us your job details for a quote: your area, the property type, the number of rooms and which rooms have aircon. ClickBina is an experienced KL & Selangor contractor that coordinates the trades for whole-house work, so the DB work, partitions and room upgrades of a room-rental house can be planned as one job. We reply within the hour, and the price we agree is a flat price with no hidden charges.

Sources & methodology

• ClickBina's water meter and submeter guide — how private submeters relate to the revenue meter.
• ClickBina's DB box size guide — circuits, spare ways and the breaker and appliance-circuit prices.
• ClickBina's electrical safety inspection and adding power points guides — inspection and socket prices.
• ClickBina's room-rental conversion, HMO and high electricity bill guides — letting rooms and reading the bill.

How we price: every RM figure on this page is quoted unchanged from the ClickBina guides named above; they are indicative Klang Valley ranges for 2026. No tariff figure is quoted, because the fair rate is worked out from your own TNB bill each month.