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The exposé that answers the light question
📐 For agents, developers and planners

The exposé that answers the light question

A floor-plan PDF, OpenImmo file or IFC model becomes a 3D room, run against the City of Vienna’s official data: sun per room, noise, heat, zoning. No scan, no appointment.

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An exposé describes the flat. What it almost never describes is what the flat cannot change: which room gets sun in December, how loud the street is at night, how the summer heat behaves in this block, whether the roof would carry a solar array. Those questions decide whether someone still likes the flat in the second winter — and they are answerable from open data, for any address in Vienna.

Three ways in

📥Floor plan PDF · Rooms, areas, storeyThe reader pulls room names and square metres out of the drawing and holds them against the stated total floor area — two independent figures in the same document. If they match, no room is missing and none is counted twice. A scanned plan without a text layer cannot be read; the page says so instead of guessing.
📥OpenImmo XML · The agent export you already haveAddress, storey, rooms, orientation and year of construction come straight out of the fields your software already fills. A floor plan attached as a PDF inside the XML is read as well. Prices, commissions and contacts are never touched — this report is about the place, not the deal.
📥IFC model · Rooms as named objectsIFC is the one format in which rooms are objects with a name and a net floor area, not lines on a sheet. Read are the spaces, the storey and the number of windows. What is not taken over: the position of the rooms relative to each other — the drawing shows the right rooms in a set arrangement, not your floor plan. That limit is printed on the screen, not hidden.

Whichever way the data arrives, one reader stands behind all three — so the screen and the exported PDF can never disagree. What a file does not contain stays empty and is named as missing; nothing is filled in with a plausible guess.

Three ways to start — one measurement

Each of these three doors opens Azima for what you are planning. The choice changes no figure, only the order: which chapter opens first after the measurement, which action comes first and which sheets the report preselects.

📣Marketing a propertyAfter the measurement the report comes first — with the sheet "For the conversation" (one sentence per measured drawback), the light widget for the listing and "My properties" for every address you have calculated. Start, address, report: three clicks.🏗Building or managingFirst, what the house still allows: added storeys, attic conversion and a new building by building class or an entered metre figure, neighbouring plots that can be merged, the developer calculation as a CSV — and alongside, the roof with solar potential, green roof and dated funding. The report preselects the whole house.🔑Looking for a flatFor your buyers: first the light on their floor, room by room as soon as a floor plan is added — and what the neighbours may still build, before anyone signs.

No floor plan fit to show? In the floor-plan studio, import the planning drawing or draw it fresh, furnish it and save a marketing plan — PNG for the portal, a to-scale A4 PDF with living and outdoor areas kept apart, DXF for the office. With your sender name on the sheet; then Azima measures the light per room.

Azima summer sun load per room: the flat from above, each room coloured by summer sun exposure, with legend.
Sun load per room Every room of the flat coloured by its summer sun exposure — here the example house, Schrankgasse 10, on 21 June. The same picture goes into the PDF. Check your own address →

In your listing, live — one line of code

The card above is the real widget, calculated in your browser just now. How to put it on your page: the light widget.

Nothing changes for your site’s cookie banner: the widget sets no cookies, stores nothing in the browser and loads no tracker — the security rule of its frame lets only scripts from viennalivingmap.com run. What it queries is open geodata: building heights, roof surfaces and the solar cadastre of the City of Vienna, the city’s address service when no coordinate is given, and OpenStreetMap only where official heights are missing. Counting happens only on the server and only as a total per path — enough to see how often the frame was loaded, without the address and without a referrer. The report is a PDF file and loads nothing when opened.

What is on the sheets

✓Hours of sun per room, with what the neighbours takeLiving room 4.2 h on 21 June, the buildings opposite take 1.3 h — from the measured obstruction horizon (City of Vienna eaves heights), for your floor, on four reference dates.
✓How deep the sun reaches into the room, in June and in DecemberA section through the window: the wedge of light at the middle of the sunny hours and the patch on the floor, in metres from the window. In winter the sun is lower and often reaches further in. The window height follows the City of Vienna building typology.
✓The sundial across the yearWhen which room gets sun: the day, the course of the year in twelve monthly points, the winter — which rooms the sun still reaches on 21 December, and when.
✓Sun-load and plant-light map of the flatWhere it gets warm in summer, and where the monstera or the cactus should stand — a relative index within the flat, never a made-up temperature.
✓The building opposite, your rank among the neighbours, and what followsDistance, measured height and angle of the first house in the line of sight; how your façade ranks against the neighbouring façades at the same height — and whether external shading pays off, where the brightest winter workplace is, whether you sleep towards the courtyard or the street.
✓Classification under EN 17037, as a classificationThe thresholds of the standard — 1.5 / 3 / 4 hours on 21 March — are on the sheet so that a figure has a scale. Not a certificate under § 106 of the Vienna Building Code / OIB Guideline 3 and none under ÖNORM EN 17037; that is on the sheet as well.
✓Official data for the address and the zoning planZoning and protection zone, listed buildings, plot, noise, flooding, heavy rain, torrents and avalanches, terrain, contaminated sites, radon, earthquakes, subsoil, fibre, plus café terraces, building greening and EV charging nearby — 16 registers of the city, the federal government and the Environment Agency, each statement with its date and its limit; plus the city’s zoning plan as an excerpt around the address.
✓Aircraft noise at the address, from its own measurementsWhether the approach path runs over the house, and how many aircraft actually pass — overflights per day, the daily course and the lowest aircraft from its own ADS-B sample series over weeks, not a yes/no per district.
✓The roof: official solar potential and green-roof potentialIrradiation in kWh per m² and year, well-suited area and kWp from the City of Vienna solar cadastre — plus how much of the roof can be greened and the rainwater it would retain, computed per roof face on the official roof model.
✓The surroundings on the Vienna scaleSummer heat and road noise (official 2022 mapping), markets, water, street trees — and the neighbourhood portrait. A measured disadvantage is never removed, only explained better.
✓An exposé of about 25 pages with your logoThe place, the flat in three pictures, hours per room, the sundial across the year, the heat map, the plant light, the sky over the address, the surroundings and the roof — generated in the browser as a vector PDF, nothing leaves the device. The report PDF comes in English; the neighbourhood portraits inside are written in German.
✓Two flats compared: where does which one winSummer and winter sun, hours per room, summer heat, overflights — sentences with a winner, no table of decimals. The report itself travels as a link, without a server.

And out comes a document you can hand over

A vector PDF, not a screenshot: text stays text, the font is embedded, every device shows the same thing, and instead of a print dialogue you get a download. Page numbers, the source under every figure, and the sender in the running header. Pages can be switched off before the export — light, rooms, flight path, surroundings, location.

One rule holds for all of it, and it is worth saying out loud: a measured disadvantage is never removed. Flight paths, shading and summer heat stay in the report and get explained better — they cannot be switched off on request. A report that whoever pays for it can retune is not worth reading.

And a second rule: every figure is traceable. Every measured value carries its source and date, the sliders of the calculators start on a documented reference value and call a changed figure “your assumption”, and the project sheet for the bank lists every assumption, including the ones nobody changed.

How far the sun figure itself is off is measured, not claimed: 1,000 windows against the city’s real roofs →

What it costs in the office

For comparison: a photographer’s 3D tour costs from about €400 in Vienna — for one property. Premium costs €39 a month, for every property, and shows what no tour shows: how many hours of sun each room gets. Maps now show the sun on the outside wall for free. Azima calculates it from your floor plan, room by room, with the official data for the address and a finished report to pass on.

€Single report · €9.50 per propertyOne report for one flat, paid once — for the single sale. It costs less than half an hour of viewing.
€Premium · €39 a monthFounding price during the beta — it stays for as long as your subscription runs; new subscriptions pay €89 after the beta. Reports for every property, without a limit, for one person. Cancel monthly, no setup fee, invoice from Paddle with VAT ID (reverse charge).
€Office · €249 a monthThe same subscription for the whole office: several users on one Azima key, your logo and sender on every sheet, OpenImmo enrichment for your agency software. Cancel monthly, invoice from Paddle to the office — on request also by invoice and bank transfer.

From report no. 5 a month Premium is cheaper: 5 single reports cost €47.50, Premium €39. Worked example for a developer: 40 flats one by one are 40 × €9.50 = €380, one month of Premium costs €39. Measured against one sale: on a €400,000 flat the agent’s commission is capped at 3 % per party under Austria’s estate-agent regulation, that is €12,000 plus VAT — Premium is 0.3 % of that.

The tools — OpenImmo enrichment, partner link, widget, your own sender — are free for everyone; you only pay for the reports, with Premium without a limit.

See Premium →

Questions about buying? One line to [email protected] — ideally with the invoice number from Paddle’s e-mail.

Frequently asked

Does the file leave my computer?

No. PDF, XML and IFC are read in the browser — there is no upload and no endpoint they could be sent to. The address itself is only ever passed to third-party services in rounded form (building heights, tree register, roof cadastre), never in full.

What exactly is in the report?

Hours of direct sun per room on the summer and winter reference days, a sun-load map of the flat, plant light per room, the flight-path situation, and the surroundings: modelled summer heat, road noise from the official 2022 mapping, street trees, markets, water — plus the roof from two sides: its solar potential from the City of Vienna cadastre, and the area greenable by pitch, calculated for that building from the official roof model, with the rainwater an extensive build-up would hold back. Plus the sundial across the year in twelve monthly points, the building opposite with distance and height, the rank among the neighbouring façades, the fit-out conclusions (external shading, winter workplace, sleeping side) and the EN 17037 classification on 21 March — as a classification, not a certificate. Every figure carries its source and its limit.

Is this a certificate of insolation?

No, and it never claims to be. It is a model built from window direction, measured neighbouring heights (or, where those are thin, the legal building class) and the real path of the sun. Curtains, balconies and a bright wall opposite are not part of the calculation. A certificate under ÖNORM is a different, signed document.

Can I put my own name on it?

Yes. The sender slot belongs to whoever passes the report on: name and contact stay in your browser and appear on the pages. The tool’s name is not on the cover — the document belongs to the sender.

Does Azima remember my properties?

Yes, in the browser: every measured address stays in "My properties" with its floor and the three reference days, one tap opens it again, and two of them can be compared through the year with one slider. With a purchased report or Premium the list can optionally be synced across your devices — encrypted in the browser, no server reads an address.

What do I say at the viewing about a drawback?

What the sheet "For the conversation" says: one sentence per measured drawback — December light, the building opposite, what the neighbours may still build, aircraft, street noise, heat, registers — with where it comes from and what it means day to day. On the page with a copy button, in the report as a sheet of its own. Nothing measured is left out.

Can I get the surroundings as IFC for Archicad or Revit?

Yes, for every Vienna address whose area the roof model covers completely: in the “Export & share” sheet under “For planning”. The file (IFC4) holds the buildings within 150 m as volumes up to the measured eaves from the City of Vienna’s generalised roof model LOD2.1, each on its ground elevation from the 10 m terrain model, located in MGI / Austria GK East (EPSG:31256). What it does not have is stated inside it: no roof shapes, light wells inside a building closed, outlines to about 1 m. For planning with roof shapes and courtyards, the City of Vienna publishes the roof model as CityGML on data.wien.gv.at.

Does the report go into my agent software?

Two ways, neither with an upload: as an OpenImmo package — your property’s XML comes back with the location text, the light finding and the report attached — and as a link for your CRM that you store on the property. The link opens the measurement with the floor; address and floor sit in the part after the #, which the browser sends to no server.

How does Azima differ from Propcorn or the sun score on willhaben?

Both show one annual sun score from Shadowmap for a coordinate — on willhaben since December 2024 (press release), in Propcorn as an embedded service (propcorn.poweredby.shadowmap.org, in the app’s public code, read on 18 Oct 2026). Azima calculates the flat itself: hours of direct sun per room, floor by floor, from window direction, the City of Vienna’s roof model and the real path of the sun — and a measured drawback stays in the report even when it is inconvenient. Propcorn in turn is a tool for building: densification, storeys, developer calculations. Azima does not do that.

Can the office pay by invoice?

Yes, for offices: Premium or Office also by bank transfer, with 14 days to pay. Paddle, as reseller, issues the invoice to the office, with your VAT ID for reverse charge, and sends it as a PDF. Access starts with the invoice, not with the payment; your Azima key arrives by email at the same address. A message with company, address, invoice email and, if you have one, VAT ID is enough — the contact is at the bottom of this page.

What does Azima cost in the office?

Checking costs nothing: drop a plan in and read the result on screen. A report costs €9.50 per property; Premium €39 a month for every property, without a limit, cancel monthly, no setup fee — cheaper than single reports from report no. 5 a month. The tools — OpenImmo enrichment, partner link, widget, your own sender — are free for everyone; you only pay for the reports, with Premium without a limit.

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The button copies your text and opens my LinkedIn profile in a new tab – tap “Message” there and paste. The email arrives filled in.

No form server, no tracking: the text stays in your browser until you send it yourself on LinkedIn or from your mail app.

For property managers: the draft resolution for solar and green roofs · For companies: integrate or license the technology ·Calculating the residual value · Attic conversion: what the roof allows · Will a new building take the sun? · Heating without gas: what the ground says · The light tile for your listing · Pricing: free check, €9.50 report, €39 Premium · Buying a flat? Light, heat and noise before you sign · Premium: subscribe, your subscription in view · The free light widget for your listings · Green roofs: the roof model, calculated · What the house still allows: calculated from the plan, shown in real light · What Vienna still allows: room above the roofs · Solar potential · Aircraft noise · Every measurement

Sources: City of Vienna Open Data (generalised roof model LOD2.1, zoning, tree register, solar cadastre, CC BY 4.0) · OpenStreetMap contributors (ODbL) · environmental noise mapping 2022 (CNOSSOS-EU), laerminfo.at · sun position calculated astronomically. Orientation values, not a legal document.