Marc Kreitz

Overview

Marc Kreitz is an independent Luxembourg real estate expert with over twenty years of experience in real estate and digital technology. He is the founder and manager of several specialised platforms dedicated to property analysis, valuation and simulation in Luxembourg and internationally.

Alongside his property advisory activities in Luxembourg, Marc Kreitz has positioned himself on the Dubai real estate investment market, guiding Luxembourg-based investors seeking to diversify their assets towards the United Arab Emirates.

He is also involved in the development of solutions based on artificial intelligence applied to property market analysis, with the aim of digitalising and modernising sector practices in the Grand Duchy.

Beyond real estate, Marc Kreitz builds his own online platforms in his spare time. The most recent and largest of these is nautic.lu, a free marketplace for boats and moorings paired with a complete cruising guide to the Moselle.

Activities

Real estate in Luxembourg

For more than twenty years, Marc Kreitz has run his own real estate agency, Immosolutions, today ranked among the leading and most established agencies in the country. As an independent expert, he is active in property valuation, the sale of residential and commercial assets, and real estate project development in Luxembourg. His expertise covers market analysis, asset valuation and transaction management for private clients.

Property financing

With financesolutions.lu, Marc Kreitz extends his real estate support to the financing side. The platform provides a calculator that works entirely in the browser, showing a realistic purchase budget, the monthly instalment, the debt-service ratio and the full acquisition costs — registration and transcription duties, Bëllegen Akt, notary fees and mortgage registration. The credit brokerage itself is handled by a licensed mortgage credit intermediary, giving access to seven lenders on the Luxembourg market — free of charge for the borrower, as the commission is paid by the financing bank. The site is available in French, German and English.

Renewable energy

With energysolutions.lu, Marc Kreitz extends his activity to photovoltaics, battery storage and heat. The platform brings together design, subsidy application and installation of solar systems in Luxembourg, with a calculator that works out the Klimabonus Wunnen under the regime in force since January 2026 — degressive formulas for photovoltaics and storage, up to €12,250 in support for system and battery combined. Since 4 January 2026 the approved installer deducts the subsidy directly from the invoice, so nothing has to be paid up front. The systems are installed by a Luxembourg solar company with 23 years of experience, using European-made modules. The site is available in French, German and English.

Investment in Dubai

Through DubaiProperties.lu, Marc Kreitz offers a private advisory service for real estate investment in Dubai, aimed primarily at Luxembourg-based investors. He provides personalised support bridging the Grand Duchy and the UAE — a market he considers complementary to European investment due to its regulatory framework, tax environment and international momentum.

Digital platforms and artificial intelligence

Marc Kreitz develops an ecosystem of online platforms dedicated to the Luxembourg property market, covering automated valuation, capital gains calculation, notary fees and AI-driven market analysis via Stop.lu. These tools aim to make property information more accessible and transparent for both private individuals and professionals.

His property valuation network now spans nine multilingual domains — evaluationimmobiliere.lu, estimationimmobiliere.lu, hausbewertung.lu, bewertung.lu, evaluatioun.lu, propertyvaluation.lu, valutazioneimmobiliare.lu, avaliacaoimobiliaria.lu, estimativaimobiliaria.lu — allowing property owners in Luxembourg to obtain a valuation in French, German, Luxembourgish, English, Italian and Portuguese.

His valuation project imo.lu is likely the most accurate property valuation tool ever developed in Luxembourg. For the first time, a formula of such complexity — combining advanced algorithms and artificial intelligence — has been applied to real estate valuation in the Grand Duchy, covering apartments, houses, land and garages across all 122 Luxembourg communes.

Beyond real estate, Marc Kreitz has also launched secondhandshop.lu, the first AI-driven second-hand marketplace in Luxembourg. The platform integrates automatic photo recognition, AI-generated multilingual listings (French, German, English), as well as algorithm-assisted categorisation and price estimation — an unprecedented approach on the Luxembourg second-hand market. The platform is also available as native mobile apps for iPhone (iOS) and Android, entirely designed and coded by Marc Kreitz himself.

Marc Kreitz also applies artificial intelligence to personal collection management. Virtualibrary.lu is a multilingual digital library (French, German, English) that catalogues books through photo recognition and OCR, while flacon.lu is Luxembourg's first AI-powered perfume library: a single photo of a bottle is enough to identify it, organise it and build a personal fragrance collection.

With homeoffice.lu, Marc Kreitz steps outside real estate: the platform is aimed at cross-border commuters working in Luxembourg and counts their home-office days, tracking the tax tolerance threshold separately from the distinct social-security limit. The calculator runs entirely in the browser, stores none of the data entered, and is available in French, German and English.

Boating and the Moselle (personal project)

His most recent and by far largest project is built in his spare time: nautic.lu combines a free marketplace for boats, boat rentals and moorings in Luxembourg and the border region with a complete cruising guide to the Moselle — from the Apach lock on the French border (km 242) down to the confluence with the Rhine at Koblenz. It covers thirteen locks with chamber dimensions, lift heights, VHF channels and phone numbers, harbours, marinas and landing stages, bridge clearances, designated berths, water levels and flood marks.

Alongside it are a trip planner that works out stages from Schengen all the way to the Mediterranean, live logging of a passage on board, a VHF radio assistant, an emergency page, an events calendar and a forum. Listings are free — no commission, no premium tier and no account required; a link sent by email is enough to edit them. The site is available in French, German and English.

nautic.lu is also available as native mobile apps for iPhone (iOS) and Android, designed and coded by Marc Kreitz himself and under constant development: they bring the Moselle chart, listings, passage logging and the VHF assistant to the phone, and evolve at the same pace as the website.

Artificial intelligence deliberately plays a supporting role: a language model writes the daily "good day to head out?" assessment, answers follow-up questions on it, estimates destinations outside the stored stage data in the trip planner, and translates listings. The assessment itself — wind, gusts, visibility, precipitation, thunderstorms and rising water levels — rests on fixed, openly documented thresholds and stays unchanged even if the AI service is unavailable.

Projects and platforms

• Immosolutions.lu — Marc Kreitz's real estate agency, operating for over 20 years and among the leading agencies in Luxembourg
• Immopromotions.lu — Property development in Luxembourg
• Imo.lu — Likely the most accurate property valuation tool in Luxembourg
• Evaluationimmobiliere.lu — Multilingual online property valuation network, also available via estimationimmobiliere.lu, hausbewertung.lu, bewertung.lu, evaluatioun.lu, propertyvaluation.lu, valutazioneimmobiliare.lu, avaliacaoimobiliaria.lu, estimativaimobiliaria.lu
• Plusvalue.lu — Capital gains simulation for property
• Fraisdenotaire.lu — Notary fee calculator for Luxembourg
• Financesolutions.lu — Property financing in Luxembourg: borrowing capacity and acquisition cost calculator, credit brokerage through a licensed intermediary, in French, German and English
• Landbrokers.lu — Land brokerage and plots
• Heriditas.lu — Platform for real estate succession matters
• Stop.lu — AI-based property market analysis
• DubaiProperties.lu — Private real estate investment advisory in Dubai for Luxembourg investors
• CentralIntelligence.lu — Central hub for AI and digital projects
• Nautic.lu — Personal project: boats, moorings and a complete cruising guide to the Moselle — free listings, locks, harbours, bridges and water levels, trip planner and VHF assistant, in French, German and English, plus iPhone and Android apps under constant development
• Secondhandshop.lu — Luxembourg's first AI-driven second-hand marketplace, with photo recognition, automatic multilingual listings and iPhone and Android apps developed by Marc Kreitz
• Virtualibrary.lu — Multilingual AI-powered digital library, with cataloguing via photo recognition and OCR
• Flacon.lu — Luxembourg's first AI-powered perfume library: photograph, identify and organise your fragrance collection
• Energysolutions.lu — Photovoltaics, battery storage and heat in Luxembourg: Klimabonus 2026 calculator, design and installation through a solar company, in French, German and English
• Homeoffice.lu — Free calculator for cross-border commuters: home-office day tracking, tax threshold and social-security limit, in French, German and English

Press and media

Luxemburger Wort, 9 April 2014, p. 4 — « Studios gehen weg wie warme Brötchen ». Click to view the full page.

• Luxemburger Wort (9 April 2014, p. 4) — « Studios gehen weg wie warme Brötchen », article by Diane Lecorsais
• Wort.lu — The secrets of Luxembourg's most expensive villa
• Virgule.lu — The secrets of Luxembourg's most expensive villa
• L'essentiel — Petition calling for greater protection of real estate agents in Luxembourg

External links

• about.me/marckreitz
• LinkedIn profile