Differentiated-use thousandths tables: how to create them

Why the general table is not enough

The general table expresses the proportional value of each unit and is the basis for expenses of common interest to all, such as facade, roof and overall insurance. It does not, however, capture the actual use of the individual common parts, which can vary greatly from one service to another.

Article 1123, second paragraph, requires that the expenses of things intended to serve owners to different degrees be shared in proportion to use. Applying the general table alone to these expenses produces shares that do not comply with the law and voidable resolutions.

For this reason, alongside the general table, a well-managed condominium has one or more use tables, each built on coefficients that reflect the actual usefulness of the service for each unit.

The most frequent use tables

The staircase and elevator table is built under Article 1124: half of the weights follow the value of the units and half the floor height from the ground. In practice you need to prepare a table of height coefficients to combine with the general thousandths.

The central-heating table, when the system has no heat metering, is usually built on coefficients that account for each unit's demand, for example by surface, volume or the power of the radiators. Where heat metering is present, the main share follows actual consumption under the UNI 10200 standard, while a smaller, fixed share covers the common costs of the system.

The water table, in the absence of individual meters, is often set on a criterion proportional to the number of occupants or to the units, whereas with meters the expense follows measured consumption with a fixed part for managing the common network.

• Staircases and elevator: half value, half floor height (Art. 1124)
• Heating: demand coefficients, or consumption with UNI 10200 where metering exists
• Water: by occupants or units, or by consumption with a fixed part where meters exist

How to build a use table step by step

The first step is to identify the use criterion relevant to the common part: floor height for staircases, demand for heating, occupants or consumption for water. The criterion must reflect the real usefulness of the service for each unit.

The second step is to gather the necessary data, such as floor heights, heated surfaces or volumes, the number of occupants or meter readings. The quality of the table depends on the accuracy of this base data.

The third step is to calculate the coefficients and normalize them, usually on a per-thousand basis, so that the sum of the weights is consistent. The resulting tables should be shared at the meeting together with the adopted criterion, to ensure transparency and verifiability of the shares.

Setting up the tables in the software

Managing several tables by hand is complex: each expense must be matched to the correct table and recalculated whenever coefficients or consumption change. The most common mistake is applying the wrong table to an item, for example sharing heating on general thousandths instead of use coefficients.

Setting up the tables correctly in the software means defining each one's weights once and then associating each expense category with the relevant table, letting allocations update automatically.

A management software such as AmministraPro lets you create unlimited use tables alongside the general one, link them to the respective expense categories and generate reports that show the criterion applied item by item, reducing the risk of non-compliant allocations. The features are described on the features page and the plans on the pricing page.

Frequently asked questions