Free tool
Rent Adjustment Calculator
If you charge water/electric above the actual provider rate, the CPB 2018 rule is going to hit your margin. This tells you how much.
How to use
- For each utility (electricity, water) pick how you currently bill — per meter (THB/unit) or flat fee (THB/room). You can mix: e.g. metered electricity + flat water.
- Fill in what you used to charge vs. the actual provider rate.
- Add room count, occupancy %, and current rent — click Calculate.
Values are pre-filled with a realistic example — feel free to overwrite.
Property info
%
Yearly average, e.g. 80
Used to compute % increase
Electricity
Old rate paid by tenant
Check your bill — ~4.4 (residential) or ~5–6 (commercial)
e.g. 80 units
Water
1 unit = 1 m³ = 1,000 liters
Check your bill — ~18 (residential) or ~22–30 (commercial)
e.g. 5 m³
Why this matters
Under CPB Notice 2018, dorms with 5+ units must charge water/electric at the actual provider rate. Many owners had been subsidising margin from utilities; that revenue is now structurally gone. The realistic responses are: raise rent, raise the service fee, lower costs, or some mix.