Operating cost calculator for owned flats
The FlatWatch operating cost calculator works out what your Austrian owner-occupied flat pays per square metre and month in operating costs (Betriebskosten), and sets that against the average for Austrian main-tenancy rented flats of €2.70 (Statistik Austria, Q2 2026) — because nobody in Austria publishes an average for owned flats.
You need two numbers from your annual statement (Jahresabrechnung): the floor area of your flat in square metres, and the total operating costs for one full year.
Out comes your figure in euro per m² a month, the difference against the reference value, and — if you are above it — what that difference adds up to over a year.
How does the operating cost calculator work?
The calculator divides one full year of operating costs by twelve, and then by your floor area. Twelve months and an area in square metres become a single figure you can actually compare: euro per m² a month.
Floor area (Wohnnutzfläche) is the area of your flat — not your co-ownership share, and not your Nutzwert. Operating costs per year is the total of the running charges for one full calendar year, as they appear on your annual statement — without the reserve fund, without heating and hot water, without one-off refurbishments.
Statistik Austria publishes the reference value quarterly, but for main-tenancy rented flats. We use €2.70 per m² a month (Q2 2026) because no published figure exists for owned flats — see below.
What does not belong in this calculation?
Your monthly charge usually has three parts, and only the first is operating costs: Betriebskosten, Rücklage (the reserve fund) and heating and hot water. On top of that come occasional special levies (Sonderumlagen) for a specific refurbishment. Type the total into the calculator instead of the operating costs alone and you get a figure that is alarming and wrong at the same time.
The reserve fund is not a running cost but saving for later — roof, façade, windows, heating, thermal refurbishment. Since 1 January 2026 the statutory minimum has been €1.12 per m² a month (§ 31 WEG), revalued every two years from a starting figure of €0.90. That is roughly 41 % on top of a typical operating cost figure: at 75 m², €84 a month or €1,008 a year that does not belong in this calculator.
Heating and hot water are billed separately under the Heizkostenabrechnungsgesetz, largely by consumption. So they do not belong in a per-m² figure whose job is to make flats comparable.
And a high reserve contribution is not automatically too high. The statutory minimum is a floor, not a target: § 31 WEG requires the likely development of future expenditure to be taken into account, with thermal refurbishment named explicitly. A 1960s building with its original windows that saves exactly the minimum is not thrifty — it is underfunded, and the bill arrives later as a special levy.
Why is this different for owners than for tenants?
Almost every operating cost calculator in Austria is built for tenants, and tenants are governed by a different law. Tenancy law works from a fixed list (§ 21 MRG) of what a landlord may pass on at all. In condominium ownership there is no such list: under § 32 WEG the owners carry the expenditure on the property, and that is the wider term.
It is split by co-ownership shares (Miteigentumsanteile) — that is, by Nutzwert, not by square metres — unless something else has been agreed or set by a court. So the figure this calculator produces is a comparison, not an audit of your statement: it tells you whether your building is expensive overall, not whether your personal share was worked out correctly.
Your managing agent (Hausverwaltung) still has to account for it, under § 34 WEG, for every calendar year and no later than six months after it ends.
A worked example with real numbers
A flat of 75 m², with operating costs of €2,970 a year. €2,970 divided by twelve is €247.50 a month; divided by 75 m² that gives €3.30 per m² a month.
The rented-flat average is €2.70. So this flat pays €0.60 per m² more — at 75 m² that is €45 a month and €540 a year.
€540 is not proof of a mistake. It is the amount that makes it worth looking once at what it consists of.
What does an average rented flat in Austria pay?
The published figure of €2.70 per m² a month, worked out for the usual flat sizes:
| Floor area | Operating costs a month | A year |
|---|---|---|
| 50 m² | €135 | €1,620 |
| 60 m² | €162 | €1,944 |
| 75 m² | €202.50 | €2,430 |
| 90 m² | €243 | €2,916 |
| 120 m² | €324 | €3,888 |
Source: Statistik Austria, operating costs for main-tenancy rented flats, Q2 2026, Austria as a whole.
What this figure is not: it comes from the rent survey and describes rented flats, not owned ones. Nobody in Austria publishes a comparable average for owned property, and district-level figures are not public either. We will not calculate one that does not exist. As an order of magnitude it is useful; as proof it is not.
We are building the missing figure ourselves: from the annual statements and building details owners send us — by construction period, number of flats, lift and garage. Nothing is published until at least five properties stand behind it. How that works is set out in our privacy policy.
What do operating costs consist of?
Operating costs are not a single bill but a bundle of running charges for the whole building: insurance, water and sewerage, waste, caretaking, electricity for the stairwell and cellar, the chimney sweep, property tax, the management fee, plus lift and garden where those exist. They are paid by the owners’ association (Eigentümergemeinschaft) and apportioned to the owners — not paid by you directly.
The Betriebskostenspiegel published by Mietervereinigung Wien sets out the main individual items. For the 2024 accounting year they looked like this:
| Item | Per m² a year | Against 2023 |
|---|---|---|
| Insurance | €7.11 | +2.4 % |
| Caretaking and cleaning | €6.76 | +2.9 % |
| Water and sewerage | €5.06 | +0.8 % |
| Management fee | €4.47 | +2.8 % |
| Lift (where there is one) | €3.63 | +2.8 % |
| Waste collection | €3.11 | −6.3 % |
Source: Mietervereinigung Wien, Betriebskostenspiegel, accounting year 2024, published on 26 June 2026. For the same year the survey gives total operating costs of €2.57 per m² a month, or €30.84 a year, 1.8 % above the year before.
These figures also come from rented buildings — Viennese rented buildings, whose statements members sent in. What carries over to condominium ownership is the order, not the level: a lift, a fire insurance policy and a stairwell cleaner cost the same whether the flats are rented out or sold off. What does not carry over is the list — more on that below.
The items above do not add up to that total — and are not meant to. They are the main ones, reported separately. Property tax, the chimney sweep, communal electricity, gardening and pest control sit inside the total without being named individually, and the lift only counts in buildings that have one. So the table shows how large an item usually is — it is not a breakdown of your own statement.
What pushes operating costs up?
According to Mietervereinigung Wien, more than a third of total operating costs falls on three items: Insurance, Management fee and Property tax. Two of them are in the table above and come to €11.58 per m² a year between them; property tax comes on top and is not reported separately. These are the items where asking questions pays off soonest — and the three with the least to do with what actually happens in the building.
The largest single item every building has: Insurance, at €7.11 per m² a year. The sharpest recent rise is in Caretaking and cleaning (2.9 %).
This is where ownership parts company with tenancy for the second time. The Mietervereinigung is campaigning to strike exactly these three items from the tenancy-law list. For tenants that would be a saving. For you it changes nothing: under § 32 WEG you carry the expenditure on the property, and there is no list in condominium law from which anything could be struck. You pay these three items either way — so all that is left is to check them.
What else can explain a high figure: a lift, an underground garage, a large garden, a building with a lot of common area per flat. A small building spreads the same insurance policy and the same management fee across fewer flats — which is why small properties are almost always higher per m². None of this is a mistake. It is just an explanation somebody should be able to give.
What to do when operating costs look too high
A high figure usually has a harmless explanation — the items above show which. It only gets interesting when nobody can name the explanation.
The next step is always the same: look at the largest items, not at the total. Ask for the receipts behind the three most expensive lines; the right to inspect them is part of the duty to account under § 34 WEG. Compare the same item against last year. And check whether the statement contains costs that do not concern everybody.
We look at your annual statement and send you a short report: what is missing and what you should ask for. Free during early access.
What counts as operating costs for an owned flat in Austria?
The operating costs of an owned flat are the running charges on the property: insurance, property tax, water and sewerage, waste, the chimney sweep, caretaking, electricity for the stairwell, lift and garden maintenance, and the management fee. Not included are the reserve fund (Rücklage), heating and hot water where they are billed separately, and one-off refurbishments.
How are operating costs split between owners?
In condominium ownership the expenditure is split by co-ownership shares — that is, by the Nutzwert of your flat — unless the owners have agreed otherwise or a court has decided otherwise (§ 32 WEG). Nutzwert is related to floor area but is not the same thing: position, appurtenances such as a cellar or garden, and the fit-out all feed into it.
How often must the Hausverwaltung produce a statement?
The managing agent must account once per calendar year and present the statement no later than six months after the end of the accounting period (§ 34 WEG). For the 2026 year that means by the end of June 2027. If it does not arrive, that is not an oversight you have to sit out — you can demand it.
My operating costs have risen sharply — what can be behind that?
A jump in operating costs almost always comes from a few items, not from all of them. According to Mietervereinigung Wien, more than a third of operating costs falls on Insurance, Management fee and Property tax, and the insurance premium is the item that can change in your building without notice. The sharpest recent rise is in Caretaking and cleaning (2.9 %). In the owner review we look at every item against the previous year and tell you which three explain the jump — and which of those is worth an explanation from your Hausverwaltung.
Can the Hausverwaltung raise its own fee?
The management fee follows from the management contract, not from a statutory ceiling — the well-known flat rates are Chamber of Commerce recommendations and bind nobody in condominium ownership. So an increase needs a basis in the contract, and services not covered by the flat fee must be recognisable as such. In the owner review we check whether charges for services usually covered by the fee are being billed separately alongside it, and we draft the question to your Hausverwaltung for you.
What can I do if I never receive the statement?
The statement must reach you no later than six months after the end of the accounting period, and after that you must be able to inspect the receipts — copies on request against costs (§ 34 WEG). If neither arrives you can enforce it in court: the non-contentious court orders the managing agent to produce them under threat of a fine of up to €6,000, repeatable if it keeps ignoring the order. The claim does not lapse until three years after the end of the accounting period. In the owner review we tell you what is missing from your statement and write the demand you start with.
Is my reserve fund too high?
More likely too low. Since 1 January 2026 the statutory minimum reserve has been €1.12 per m² a month (§ 31 WEG), and that is explicitly a floor: contributions have to take account of the likely development of future expenditure, thermal refurbishment included. An old building at the minimum is not saving, it is deferring the bill to a special levy. In the owner review we set your reserve against the age and condition of the building and tell you whether the balance matches what is coming in the next few years.
Does the Austrian average apply to owned flats as well?
Only as an order of magnitude. The figure of €2.70 per m² a month comes from the Statistik Austria rent survey and describes main-tenancy rented flats. No comparable average is published for owned flats in Austria. So the calculator compares your building against the rented-flat average — a usable point of reference, but not a standard you would rely on in court.
Is the operating cost calculator really free?
Yes. The operating cost calculator works instantly and asks for neither an account nor an email address; your numbers stay in your browser and are never sent. What costs money is what comes afterwards — and the owner review is free during early access too.
What should you check next?
The total is the worst place to start: it is the one thing everybody compares, and the one thing that explains nothing. From here, these are worth it:
- What the figure consists of The individual items with their amounts and the change against last year — that is where you see which item pulls a total up.
- What does not belong in it Reserve fund, heating, one-off refurbishments. Include them and you are comparing your flat against the wrong number.
- All calculators for owners What else there is already, and what is coming next.
- Free owner review We read your annual statement and tell you within 48 hours what is missing and what you should ask for.