The Real Estate Portal Optimisation Guide for Europe in 2026

Every European property portal publishes help documentation. What none of them has done is pull it all together: the technical specs, the ranking signals, and the data on which formats actually move results, across multiple platforms and markets, in one place.

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Every portal covered here has published its own data on what drives listing performance. The finding is consistent across all four: completeness outperforms quality in filtered search. The algorithm only surfaces what the listing provides: without a floor plan, it never reaches property seekers who filter for one; without a virtual tour, the same applies. Excellent photography on an incomplete listing still loses to a mediocre listing that fills every field. The sections below explain what complete actually means on each platform.

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If you work in real estate in Germany, Austria, Switzerland, France, Belgium or Spain, one of these four portals is where your listings live: ImmoScout24, Immoweb, SeLoger and idealista. Each has different mechanics. Each one also shares a pattern: the listings that rank and convert are not the ones with the highest budgets. They are the ones that get the most out of every production session.

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Backbone produces professional visuals, floor plans and virtual tours for real estate professionals. What follows is built on that operational knowledge plus published research from the portals themselves.

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ImmoScout24: Germany, Austria and Switzerland

ImmoScout24 is the largest real estate portal in the German-speaking world. As of March 2026, immobilienscout24.de attracts 49.7 million monthly visits in Germany, more than twice the reach of its nearest competitor Immowelt. In Switzerland, ImmoScout24.ch operates as part of the SMG Swiss Marketplace Group alongside Homegate and other portals in the country's dominant real estate network.

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Start with what ImmoScout24 itself publishes about user behaviour. Property seekers on the portal spend around 60% of their total dwell time on the photos. The remaining 40% is split across description, key data and floor plan. The hero image decides in under two seconds whether someone clicks or keeps scrolling. And listings with professional photographs receive up to 40% more clicks than listings with amateur imagery.

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Those numbers reshape how to think about the technical specifications. Up to 150 media files per listing are permitted: a combination of photos, PDFs, floor plans and document links. Videos are added via YouTube link. Photos must be JPG, GIF or PNG, with a maximum file size of 50MB. The hero image displays in 4:3 landscape format. Portrait-oriented photos are automatically cropped, which means a vertical shot will lose significant content if not pre-formatted before upload.

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The practical implication: 150 media slots exist, but 15 well-selected images consistently outperform 50 uneven ones. One strong image per room, in a logical sequence from living spaces through to outdoor areas and floor plan, is the right framework. Completeness matters for ranking, but quality determines whether the click happens at all.

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Floor plans are non-negotiable above the entry market. ImmoScout24's own guidance lists the floor plan as a key element no professional listing should omit. Property seekers use filters to find listings that match their layout requirements, and a listing without a floor plan is invisible to anyone who has set that filter. Without a floor plan in the structured fields, the listing simply does not appear in filtered searches that require one.

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Video has a separate placement on the portal and is indexed differently from photo galleries. A genuine property walkthrough ranks above a picture clip (a slideshow of photos assembled into a video file). ImmoScout24 treats genuine video as a more complete presentation and surfaces it higher in results.

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In early 2026, ImmoScout24 launched a conversational AI search function in Switzerland, following an earlier AI launch in Germany. The dialogue-based search refines requirements through an interactive exchange rather than a single query. Listings that describe location, property type and key features explicitly in both the structured fields and the free-text description surface more often in these AI-driven results. This is not a new discipline. It is the same thing a well-written listing has always done, now weighted more heavily.

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What to get right on ImmoScout24:

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• Hero image: 4:3 landscape, brightest and most spacious room, natural daylight, no clutter
• Photos: 15 minimum for a professional presentation, one strong image per room
• Floor plan: mandatory from the mid market upward, per storey, with room labels and dimensions
• Video: genuine property walkthrough via YouTube link, not a picture slideshow
• Structured fields: complete all feature and equipment fields since these feed search filters and AI results
• File format: JPG for all photos; pre-crop portrait shots to 4:3 before upload
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Immoweb: Belgium

Immoweb is Belgium's dominant property portal and the country's first point of contact for residential real estate search. As of April 2026, immoweb.be attracts 5.75 million monthly visits, placing it more than three times ahead of its nearest competitor Zimmo. Part of the AVIV Group, Immoweb operates in French, Dutch and English, reflecting Belgium's linguistic reality: listings in Brussels, Wallonia and Flanders all flow through the same platform.

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One feature worth understanding immediately: Immoweb has a dedicated filter allowing property seekers to search exclusively for listings with virtual tours. This is not a fringe toggle used by a minority of users. It is a front-page navigation element, which signals that a meaningful proportion of Belgian property seekers have already made virtual tour availability a search criterion. A listing without a tour is invisible to everyone who uses that filter before they reach the gallery.

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Immoweb's structure rewards completeness in the same way every major European portal does. Listings with more complete information, including all structured fields, a floor plan, photo gallery, and a virtual tour where available, perform better in search results than incomplete ones. For professional agents, the platform offers premium placement options, but the baseline quality of the standard listing still determines whether someone clicks through from the results page or keeps scrolling.

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Belgium has a bilingual dynamic that directly affects how listings are discovered. A property in Brussels reaches both French-speaking and Dutch-speaking audiences. Descriptions that include key search terms in both languages, particularly for location names (Brussels/Bruxelles/Brussel, Antwerp/Anvers/Antwerpen) and property type (appartement, maison/huis), perform better in filtered search across both language communities. This is a practical editorial decision, not a translation requirement.

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The floor plan is expected from the mid market upward. Belgian property seekers use floor plans to assess layout practicality, particularly in Brussels and Antwerp, where a significant proportion of urban properties are apartments in period buildings where room configuration is far from obvious from photos alone. A floor plan with labelled rooms and approximate dimensions reduces the friction between listing view and viewing request. Without one, a prospect who needs to assess whether a second bedroom fits a double bed or whether the kitchen connects to the garden has no way to answer that question without booking a visit first. Floor plans that answer the question convert better than listings that force the ask.

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What to get right on Immoweb:

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• Virtual tour: include one wherever possible; Immoweb surfaces a dedicated filter for it and property seekers actively use it
• Cover photo: property's strongest feature, professionally shot, landscape orientation
• Photos: professional quality throughout; one strong image per room; JPEG format
• Floor plan: expected above the entry market; particularly important in urban apartment listings where layout is non-obvious
• Bilingual description: for Brussels and mixed-community areas, include key location and property terms in both French and Dutch
• Structured fields: fill all attributes so the listing appears in filtered searches
• Premium placement: consider for competitive mandates; baseline quality still determines click-through from search
• Production on the go: the Backbone mobile app captures and AI-edits photos in the right format directly from a phone, which matters on a market where agents move fast between mandates
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SeLoger: France

SeLoger is France's leading portal for professional property listings. Its combined network of SeLoger, Logic-Immo and Meilleurs Agents reaches approximately 9 million French users every month (Médiamétrie, January 2025). Unlike ImmoScout24, SeLoger imposes no upper limit on the number of photos an agent can upload. Its platform states explicitly that photos can be added, modified or removed at any time and in any quantity, at no extra cost.

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The freedom to upload as many photos as needed is a genuine advantage, but it does not mean more is always better. A listing with 50 unselected images performs below a listing with 12 curated ones. The cover photo remains the most leveraged asset on the entire listing. According to an eye-tracking study from Old Dominion University cited in SeLoger's own editorial, property seekers spend 60% of their time on a listing looking at photos, compared to only 20% reading the description. The cover photo makes the click decision before a price has been read.

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SeLoger's 2024 research finds that listings with high-quality visuals sell 32% faster than those with amateur shots. A listing without any photos receives three times fewer clicks than a properly illustrated one. The first three seconds and the first image decide whether someone continues or moves on.

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For photo format, JPEG is the standard across French portals. HEIC files, which iPhones shoot by default, are refused or displayed incorrectly on most portals including SeLoger. Any agent or photographer shooting on an iPhone should export in JPEG format before upload. Photos should be taken in landscape orientation, from room corners to maximise the sense of space, in natural daylight where possible.

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For descriptions, the platform's algorithm favours listings that are discoverable through search. The practical version: mention the arrondissement or commune by name, the property type (appartement, maison, loft) and the key features (jardin, parking, terrasse, DPE classe B) in the description text, not only in the structured fields. Listings that use the vocabulary people actually search with surface more often in both portal search and AI-assisted results.

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SeLoger's dashboard provides view counts, click-through rates and contact data per listing. Updating one element periodically, whether a photo, a price adjustment or a description tweak, re-indexes the listing and can restore visibility that has drifted over time.

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What to get right on SeLoger:

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• Cover photo: the single highest-leverage asset. Brightest room, natural light, corner shot, landscape orientation
• Format: JPEG only. Convert from HEIC before upload
• Photo count: no upper limit, but curation matters. 12 to 20 strong images outperform 50 inconsistent ones
• Description: use the vocabulary people actually search with (commune, property type, key features) in the text, not only in structured fields
• Refresh: update at least one element periodically to maintain ranking visibility
• Response speed: replying to enquiries within one hour has a measurable effect on lead quality and portal visibility
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idealista: Spain, Italy and Portugal

idealista is the leading residential portal across Spain, Italy and Portugal. In Spain alone it hosts over 1.5 million listings, making it the primary surface for the majority of property search in those markets. Unlike Immoweb, which operates as the near-undisputed leader in Belgium, idealista competes with Fotocasa and Habitaclia in Spain, but its reach makes it the non-negotiable starting point for any serious sales mandate.

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idealista's own published guidance on listings is clear about the first image: the main photo is the listing's cover letter. It is the first thing a property seeker sees, and it must earn the click. If the property's strongest feature is the garden, the garden should be the main photo. If it is a bright contemporary apartment, the living room or kitchen earns that position. The cover image should reflect what makes the listing distinctive, not default to a generic exterior shot.

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idealista has a specific rule around neighbourhood and area photos: a maximum of three photos of the surrounding area are permitted per listing. Beyond that number, the portal removes them automatically. The remaining photo slots should cover the interior and the property itself: every room, outdoor spaces, any exceptional features. Professional photography is explicitly recommended in idealista's own documentation, for a practical reason. A professional photographer knows how to capture a property's volume and character without misrepresenting it, and idealista's own editorial flags misrepresentation as one of the most common listing errors.

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For video and virtual tours, idealista has invested in making tour availability a visible search filter. Listings with virtual tours surface to property seekers who have enabled that filter, and the proportion of Spanish and Italian users filtering for tours has grown consistently since 2022. Matterport and equivalent 3D tours are now standard on the upper-mid and luxury segments of the Spanish coastal and city markets.

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idealista's ranking also responds to completeness in the structured fields. Area, price per square metre, energy rating, and features like parking, terrace or storage room should all be filled, since property seekers filter on them and incomplete listings are excluded from filtered results.

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What to get right on idealista:

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• Cover photo: the property's strongest feature, professionally shot, well lit, honest to the space
• Area photos: maximum 3. Exceeding this triggers automatic removal by the portal
• Professional photography: explicitly recommended by idealista, not just best practice
• Virtual tour: expected from the upper-mid market upward; Matterport for premium, lighter 360° for the mid market
• Structured fields: fill all attributes including energy rating, features and surface area
• Description: name the neighbourhood, the property type and key features in plain searchable language
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What all four portals have in common

Four different portals, four different countries, four different ranking algorithms. Reading the official documentation and the published data across all four, the same pattern appears every time.

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Completeness wins. Every portal rewards listings that fill every available slot: photos, floor plan, video, tour, feature fields, description. Not because completeness is aesthetic, but because property seekers use filters. A listing without a floor plan is invisible to everyone who has set the floor plan filter. A listing without virtual tour availability does not appear in results for those who have filtered for tours. Each missing element is not an incomplete listing. It is a listing that has excluded itself from a proportion of the market.

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The first image decides the click. On every portal, in every market, the cover photo is the only asset a property seeker sees before deciding whether to open the listing. Professional photography consistently produces 30 to 40% more clicks than amateur imagery, across portals and markets. Someone scrolling past 40 listings has roughly two seconds per listing. The cover image earns the next action or it does not.

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The listings that compound are not the ones with the most assets. They are the ones where a single production session covers every surface: hero photo, full gallery, horizontal video for the portal, vertical cut for social, floor plan, and virtual tour. The marginal cost of adding a floor plan to a photography shoot is a rounding error compared to the listings that never surface in filtered search because it was missing. As 5 Real Estate Marketing Shifts Coming to Europe laid out, the asset that wins in 2026 is the one produced once and deployed everywhere.

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See how Backbone handles full-production listings across markets →

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The ranking signal that's changing fastest in 2026

ImmoScout24 launched conversational AI search in Germany and Switzerland in early 2026, allowing property seekers to refine requirements through an interactive dialogue. The other portals are following. The direction is set.

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What this changes is not the quality bar. That was already there. What it changes is the description. AI-powered search assembles results from listings that describe properties in specific, searchable language. "Two-bedroom apartment with terrace in Ixelles, energy class B" surfaces in a conversational AI query. "Charming flat in a sought-after neighbourhood" does not.

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Portals handle their own schema markup. What agents control is how explicitly they describe their listings in every text field. That means neighbourhood by name. Property type by name. Key features by name. Not as a marketing statement. As information.