Best Diag Immo


Our company is specialized in real estate diagnoses in Paris and its suburb and offers various services related to real estate transactions. 


Carrez and Boutin Measurement

Asbestos Before Work or Demolition Diagnosis

Lead Before Work or Demolition Diagnosis



Customer Satisfaction

Always do the Best for our customers with smile!



Appointment and report within 48 hours maximum 


High Quality Of Work

We carry out all our diagnoses with the greatest seriousness and professionalism and provide our clients with relevant information and advice. 


English Language Service

We provide you with a free summary in English of your diagnoses in addition to those established in French.


Quality Of Service


Are Our Priorities 

And At The Right Price 


Because we know that it is often difficult to understand french laws and to know all the steps concerning real estate transactions, especially for foreigners, we have set up a dedicated service in English for our customers. A technical advisor is at your disposal to answer all your questions and help you secure your transaction. 

In addition to being a diagnoses company, Best Diag Immo offers a real quality of service thanks to its availability, reactivity, and the accuracy of its reports.  

With its privileged know-how and expertise in the technical field of building, Best Diag Immo constantly monitors regulations and uses high-performance, state-of-the-art equipment.

We carry out your emergency diagnoses in the evening and on saturday to meet the requirements of real estate transactions and always at competitive rates!


The customer service open 6/7 answers all the questions concerning the regulations in force and establishes you immediately a free estimate, you can also make an appointment with a diagnostician. If you understand french, you can as well, calculate your own price online, make an appointment and pay directly on our secure website

Best Diag Immo operates among others in Paris, Neuilly sur Seine, Asnières sur Seine, Boulogne Billancourt, Courbevoie, Levallois Perret, Puteaux, Nanterre, Saint Cloud, Saint Denis, Epinay sur Seine, Deuil la Barre, Groslay, Argenteuil, Sannois, Pierrefitte sur Seine, Montmorency, Eaubonne, Enghien les Bains, Aubervilliers, Pantin, Gonesse, Garges Lès Gonesse, Sarcelles and more widely in the departments 78,92,93,94,95.


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About Best Diag Immo  

Friends for many years, Rachel and Stéphane, the founders, have a long history … They worked together for several years. After having managed subsidiaries of large European industrial groups for several years, Rachel and Stéphane wanted to create their own company. The choice of a real estate diagnostics firm came naturally to them. On the one hand, because the business combines technical expertise with their knowledge of the building industry and because this sector of activity, which is constantly changing, meets their need to be challenged.

Latest Customer Testimonials

“Thank you for updating my diagnostics at no extra charge. You are true professionals!.”

Published on May 13 2021

Patricia V.

“I highly recommend this team, very reactive in responding to the need, and very professional in the diagnosis as well as in the explanations and advice given throughout the intervention. The report is also of a great quality.”

Published on April 14 2021

Lionel M.

“Rachel and Stéphane, a very professional and friendly team. Clear and precise explanations before and during the service. Don’t change anything, it’s perfect as it is!”

Published on April 21 2021

Nadège R.

“Very user-friendly website, very pleasant telephone reception, quick intervention, very professional and very friendly technician. Obtaining reports within 24 hours for a very reasonable price.”

Published on April 23 2021

Catherine M.

Contact Us

09 74 19 54 65