Common real estate mistakes
and how to avoid them
“We often learn from our mistakes. But we might as well learn from other people’s too.”
Although real estate is known as a solid and relatively safe investment, it can also lead to considerable financial losses if the wrong decisions are made. Many investors, beginners and experienced alike, make mistakes that could easily be avoided with better preparation, a deeper knowledge of the market and a clear strategy. Anticipating these mistakes is essential to ensure the profitability of your investments and avoid harming your assets.
Update 2026 · updated October 2026
- Don’t rely on an old energy rating: since January 1, 2026, the calculation has changed for electrically heated homes.
- Departments have been allowed to raise transfer duties by 0.5 point: budget for notary fees close to 8% of the price for older properties.
- Model your financing at current rates: they have moved from about 3.2% at the start of the year to 3.5 to 3.75% in October 2026.
In this article, we present the most common real estate mistakes and, above all, strategies to avoid them. By adopting good practices and getting properly trained, you can maximize your chances of success while minimizing the risks of property investment.
The first mistake we frequently see among investors is buying on impulse. A property with undeniable charm can hide a poor return or latent defects; that is why we insist on a rigorous calculation of the internal rate of return, reading the HOA meeting minutes and surveys, and checking the HOA fees and medium-term prospects for value growth. Horizons Immobilier offers full support to carry out this analysis and secure your investment.
The second mistake is underestimating the real cost of work. Initial quotes do not always account for every contingency: extra costs to meet standards, additional delays, changes in material prices. To protect you against these overruns, our network of partner contractors provides transparent quotes, and we always recommend an additional 20% contingency.
Third pitfall: neglecting the relationship with the tenant. Poor administrative follow-up and a lack of responsiveness can lead to unpaid rent and damage. Our advisory service gives you a single point of contact to ensure a smooth experience for both you and your tenant when needed.
Finally, failing to keep up with legislative and economic changes can be costly. Tax programs and condominium rules change frequently: only constant monitoring ensures your strategy is adjusted in real time. At Horizons Immobilier, we alert you as soon as an important change occurs and help you measure its impact on your assets.
By avoiding these main pitfalls, you secure your investments and maximize your chances of long-term success. Rigorous analysis, quality partners and responsiveness to the unexpected are the watchwords of flawless asset management.
About the author
Walid Fourhal Founder of Horizons Immobilier
Walid advises sellers, buyers and investors in Paris and Île-de-France, from the initial valuation through to closing at the notary’s office, in both French and English. He holds the French real estate license “Transactions sur immeubles et fonds de commerce” no. CPI 9201 2025 000 000 047, issued by the CCI Paris Île-de-France.
