Free for everyone
Tools
Four free calculators for owners and tenants: security deposit, CO₂ cost split, modernisation levy and statement deadline – straight from the statute.
Deposit calculator
Three-month cap and instalment plan per § 551 BGB, checked in seconds.
CO2KostAufGCO₂ cost calculator
The CO2KostAufG ten-tier model: your share, instantly.
§ 559 BGBModernisation levy
Permissible increase per § 559 BGB with the 8% levy and caps.
§ 556 Abs. 3 BGBStatement deadline
When your utility statement must arrive (§ 556 (3) BGB).
KennzahlRental yield
Gross and net yield – the purchase decision in two numbers.
§ 558 Abs. 3 BGBIncrease cap
Does the increase respect the 15/20% three-year cap?
GrEStGPurchase costs
State transfer tax, notary, broker – the true all-in price.
WoFlVLiving area (WoFlV)
Slopes, balconies and terraces counted correctly.
§ 573c BGBNotice period
Notice by tenure and earliest end date (§ 573c BGB).
BetrKVCharges check
Your operating costs per m² vs. the national average.
Peters-FormelReserve calculator
The adequate maintenance reserve per Peters' formula.
§ 288 BGBDefault interest
Base rate + 5 points, to the day (§ 288 BGB).
GrStGProperty tax
Value × factor × multiplier – the new tax since 2025.
§ 556a BGBCost splitter
Any cost line split by area, persons or units.
§ 28 WEGHausgeld check
Is your Hausgeld per m² plausible? The market comparison.