WISO granny flat 2020 Accounting of the granny flat made easy! Secure billing of heating and ancillary costs Save time compared to conventional solutions (e.g. Excel or Word) Audited sample letter collection Landlords guide with general tips and hints Automatic Updates Your home is quickly registered with WISO Einliegerwohnung. The clear operation ensures that invoices and meter readings can be entered quickly and easily. Afterwards, one click is all it takes to create the heating and utility bill. Your advantage: Compared to conventional solutions (e.g. Word and Excel) the use of WISO Granny annexe saves you a lot of time and money in the calculation. WISO takes care of this automatically for you. At the same time, you can be sure that your service charge settlements always comply with the current legal situation. Changes in tenancy law are automatically updated in the software. What can WISO granny annexe? With WISO Einliegerwohnung , you can create a day-accurate heating and se...