Price a home for sale using OMI quotations

What an OMI quotation is

According to the Agency, the quotations identify for each homogeneous zone (zona OMI) of a municipality “a minimum/maximum interval, per unit of surface in euros per square metre, of market and rental values, by property type and state of conservation”. Sale and rental values are separate. The range describes ordinary properties: dwellings of exceptional quality or exceptional dilapidation, and unusual properties, are left out of the interval. The Manual adds that the range is meant to show where the average value of units in ordinary condition is most likely to fall, and that, as a rule, the gap between minimum and maximum for the prevailing building type in a zone should not exceed 50%.

The state of conservation has three levels: ottimo (excellent), normale and scadente (poor). A zone’s quotation for a given building type normally refers to the prevailing state in that zone, and when several states are valued, the prevailing one is specified. Two exceptions matter if you sell something other than a flat: for garages and parking spaces, the state makes little difference to value; for shops, the letters describe the commercial position, not the condition of the unit.

Where the figures come from

The Manual explains that the Observatory surveys the market using sampling plans. In 2024 it surveyed about 5,000 OMI zones in 1,500 municipalities, which hold two thirds of the national stock and account for 72% of home sales (2023 figure). For the sales records it collected, deeds of sale were the source for about 75% of the records, property offers for about 20% and other sources for about 5%. In municipalities not covered by direct survey, the Manual says only a “broad analysis” of trends is done. If you sell in a small municipality, the quotation may therefore rest on less local evidence than the figure suggests; ask a local professional to sanity-check it.

How to look up your zone

The Agency’s page offers a free text search by half-year, province, municipality, OMI zone and use (residential, commercial, office or production), back to the first half of 2006, and a map search from the first half of 2016. Bulk download of the national database needs authenticated access to the Agency’s online services; the free search is enough for a single home. The zone boundaries are a different matter: the Agency’s 2026 guide to the quotations says the perimeters of the OMI zones of every municipality can be downloaded free of charge, in KML and GML formats, from the map consultation, for one municipality or a whole province. No login is needed for that.

Three practical points:

• Find the zone by address on the map, because a municipality can have several zones with very different ranges. The page carries a note on the 2024 revision of the zones, so confirm that the zone shown matches the current boundaries.
• Read the residential card, then the line for your type (for example civil dwellings, villas and small villas, or economy-type housing) and condition.
• Note the half-year. Use the latest, and compare with the previous one to see direction.

When you quote or publish OMI data, the Agency requires the source line “Agenzia delle Entrate – OMI”.

From range to a first estimate

Surface matters as much as the price per square metre. The OMI uses the commercial surface, which counts the main rooms and weights the other spaces by economic usefulness. The Manual’s annex sets out the weights for a residence:

• main rooms and direct accessories (bathrooms, entrance, corridors): 100%;
• cellars, attics and storerooms: 50% if they communicate with the main rooms, 25% if not;
• balconies and terraces: 30% up to 25 m² and 10% above if communicating, 15% and 5% if not;
• private gardens and yards: 10% up to the area of the main rooms and direct accessories, 2% above.

Walls count up to a thickness of 50 cm (shared walls 50% up to 25 cm), and areas under 1.50 m of headroom are left out. The total of weighted accessories and appurtenances may add at most 50% of the main rooms plus direct accessories.

Formula: estimated value = commercial surface × a unit price between the minimum and maximum for your zone, type and condition. As a calculation with arbitrary dimensions: a flat with 70 m² of main rooms and direct accessories, a 10 m² non-communicating cellar and a 12 m² communicating balcony has 70 + (10 × 0.25) + (12 × 0.30) = 76.1, rounded to 76 m² of commercial surface. Multiply 76 by the minimum and by the maximum in your zone to get two ends of a first range. Where you fall inside the range depends on floor, light, noise, building condition, parking and the legality of the paperwork.

The limits, in the Agency’s own words

The Agency warns that the quotations are not substitutes for an individual estimate and “give indications of value at the broadest level”; only a professional’s valuation can fully describe the property and justify its value. They also reflect typical condition in the zone, not yours. A flat in better condition than the zone’s norm can sit above the maximum, and one needing work can sit below the minimum. Selling prices are not the same thing as the ranges either: the figures are drawn from deeds and offers from earlier periods, so a fast-moving market can leave them behind.

Two other tools complement them. The Agency’s service for declared real-estate values lets you consult prices declared in deeds of sale registered in the last five years, with the properties shown on a map. And a local agent can show recent comparables.

Which professional to consult

A surveyor or architect can produce a reasoned valuation that the OMI range does not provide. A real estate agent knows asking and closing prices on your street; compare an agent’s figure with the OMI range, and ask how the agent reached it. When you sell, see selling property in Italy and agent commission.