What unexpected maintenance costs might impact long-term ROI?

International buyers investing in Costa del Sol property between 2025 and 2035 should be aware of several unexpected maintenance costs that can significantly impact long-term return on investment. Firstly, while many newer developments boast modern construction, older properties, especially those built in the 1970s and 80s, may require significant upgrades to plumbing, electrical systems, and structural integrity. These can be costly and unforeseen if not thoroughly inspected prior to purchase. Secondly, properties with pools or extensive gardens incur ongoing maintenance expenses for cleaning, chemicals, irrigation, and landscaping, which can run into several hundred euros monthly, particularly during peak seasons. Air conditioning units, essential in the Costa del Sol climate, also require regular servicing and may need replacement every 10-15 years. Furthermore, properties within communal settings, such as apartments or urbanizations, are subject to community fees (communidad). While these cover shared amenities like pools and gardens, unexpected special assessments for major repairs to the building's facade, roof, or common infrastructure can arise, sometimes totaling thousands of euros. Lastly, the coastal environment, with its high humidity and salt air, can accelerate wear and tear on external paintwork, window frames, and balconies, necessitating more frequent upkeep than properties in less corrosive climates. Factor in potential pest control issues, especially for properties with gardens, and the cumulative impact on your investment viability can be substantial if not budgeted for proactively.