🪟 For agents, developers and portals

Hours of sun in the listing — embed it for free

The Azima light widget shows on any listing page how many hours of direct sun a Vienna address gets on 21 March, 21 June and 21 December — calculated from the officially measured building heights of the City of Vienna, in the visitor’s browser, free of charge and without tracking. One line of code is enough.

Copy the line

Free · no account · no tracking · the full report: €9.50

Every listing says how many rooms a flat has. Almost none says whether the sun reaches the flat in December. The widget puts the answer on the listing page — three figures from official data, free.

This is what it looks like — live, for Schrankgasse 10, 3rd floor

The card above is the real widget, calculated in your browser just now. The same line of code puts it on your page.

Embed it in one line

<script src="https://viennalivingmap.com/einbetten.js" data-adresse="Schrankgasse 10, 1070 Wien" data-etage="3" data-partner="YOUR-KEY" async></script>

1Copy the lineOne script tag, shown below. Put it where the card should appear on the listing page — under the photos, next to the facts, above the contact form.

2Enter address and floordata-adresse takes the address as it stands in the listing, data-etage the floor. A coordinate (data-lat, data-lng) works too and saves the address lookup.

3DoneThe card sets its own height and language, and works in any software that allows a script tag or an iframe: agent websites, WordPress, portal templates, exposé pages. Below the card the script adds one source line with a link to Azima.

Without a script tag — for portals and templates that only allow frames — the same card as an iframe:

<iframe src="https://viennalivingmap.com/einbetten#adresse=Schrankgasse%2010%2C%201070%20Wien&etage=3&partner=YOUR-KEY" title="Sun at this address" loading="lazy" referrerpolicy="no-referrer" style="width:100%;max-width:560px;height:440px;border:0"></iframe>

Only the roof — for property managers, developers, solar and green-roof firms (13 October 2026): the same line with data-teil="dach". The card shows solar and green roof with a quick estimate in euros and links to the roof calculator in Azima.

<script src="https://viennalivingmap.com/einbetten.js" data-adresse="Schrankgasse 10, 1070 Wien" data-teil="dach" data-partner="YOUR-KEY" async></script>

The parameters

·data-adresse"Street number, postcode Vienna". Without a coordinate the visitor’s browser asks the City of Vienna’s address service; only a house match with the same postcode counts — a street centre would report the neighbour’s sun.

·data-lat / data-lngA coordinate inside Vienna. Then nobody asks an address service at all.

·data-etageThe floor of the flat (0 = ground floor). Without it the card shows two rows: ground to 2nd floor, and from the 3rd floor.

·data-partnerYour key (letters, digits, - and _, at most 40 characters). It travels in the link to the full light check.

·data-lang, data-thema"en" for the English card; "dunkel" or "hell" for a dark or light colour world. Without them: German, light.

·data-teil"dach" shows only the roof — solar and green roof with a quick estimate in euros, without the hours of sun (for property managers, developers, solar and green-roof firms). Its link opens the "Roof" tab in Azima with the sliders.

What the card shows

☀Three reference days21 March, 21 June and 21 December — the equinox and the two solstices; the day of the year the sun is highest and lowest.

☀The classification under EN 17037On 21 March the standard names thresholds for direct sun: at least 1.5 hours (minimum), 3 hours (medium), 4 hours (high). The card sorts the calculated hours into them — a classification, not a certificate.

☀The floor, not the streetHours for the given floor; from the 3rd floor upwards the horizon is lifted, because a higher window sees over lower neighbours.

☀On the roof: solar and green roofFor the whole building: the solar potential from the City of Vienna’s register (kWp, suitable area, about how many kWh a year depending on orientation) and the area that can be greened by roof pitch, calculated from the City’s roof model LOD2.1 — each with a quick estimate in euros, as a range, using the same reference values as the calculators in Azima (power a year, cost of greening; funding never included). Where a finding is missing, its line is missing — nothing is estimated.

☀“Not an expert report” and the sourceEvery card says what it is and where the heights come from: City of Vienna, data.wien.gv.at, CC BY 4.0.

☀The link to the full light checkWith your partner key: Azima opens with the address, shows the house, every window, every room and the path of the sun across the day.

Why it is free

The widget is the shop window of Azima. Every card carries the link to the full light check, and that is where the paid reports are made — €9.50 per report, €39 per month for Premium (pricing). The widget itself costs nothing, needs no account and has no limit per listing.

Your visitors stay your visitors

Address and key stand in the fragment of the frame (after the “#”) and therefore never travel to a Vienna Living Map server; the access log sees only /einbetten. No cookies, no tracking, no user profiles, no referrer. The visitor’s browser fetches the building heights from data.wien.gv.at and — only when no coordinate is given — asks the City of Vienna’s address service for street and house number. One single message goes to your page: the height of the card in pixels.

Honest, even when it hurts

A measured disadvantage is never removed, only explained better. The widget shows the hours the official heights yield — 1.1 hours in December included. That is exactly why a flat hunter believes the card — even on the advertiser’s own page. The card says “not an expert report” and names its source; a certificate of insolation under ÖNORM is a different, signed document.

Open Azima, the full light check →

Frequently asked

What does the widget cost?

Nothing. No account, no card, no limit per listing or per page. The reports on Azima earn the money: €9.50 per report, €39 per month for Premium.

Where do the numbers come from?

From the generalised roof model of the City of Vienna (officially measured building heights, CC BY 4.0), the terrain and the astronomical path of the sun: for every compass direction the model finds how high the neighbours block the horizon and when the sun stands above it. It is the same calculation as in the Azima light check.

Is this a certificate of insolation?

No. It is a model built from measured neighbouring heights and the real path of the sun; curtains, balconies and trees are not part of it. The card says so on every listing page. A certificate under ÖNORM is a different, signed document.

What does Vienna Living Map see of my visitors?

A request for /einbetten without an address, without a cookie, without a referrer. Address and key stay in the fragment of the frame, which never reaches a server. For the roof the visitor’s browser asks the City of Vienna’s solar register directly, with an area rounded to about 40 metres. No user profiles, nothing is passed on.

Does it work outside Vienna?

No. Without official building heights Azima gives no hours; for an address outside Vienna the card says that it did not find a house.

Can I hide bad values?

No. A measured disadvantage is never removed — that holds for every card and every report and cannot be switched off. You only decide whether to embed the widget.

Why is it free?

Because the widget is the shop window of Azima. Every card links to the full light check, and that is where the paid reports are made. A free card on thousands of listings counts for more than a licence fee.

What is EN 17037?

The European standard for daylight in buildings. For 21 March it names thresholds for direct sun: at least 1.5 hours (minimum), 3 hours (medium), 4 hours (high). The card classifies the calculated hours by these thresholds — as a classification, not as proof.

For agents & developers: OpenImmo, floor plan, IFC · The light check · Prices and terms

Sources: City of Vienna Open Data (generalised roof model LOD2.1, address service, CC BY 4.0) · terrain from the Copernicus DEM · sun position calculated astronomically · EN 17037 thresholds for direct sun on 21 March. Orientation values, not a certificate.