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10 costly finishing mistakes and how to avoid them

23 April, 2026 MS Immo Team 33 Visitors

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10 costly finishing mistakes and how to avoid them

Successfully completing the finishes is the most delicate stage of a construction site in Tangier. This is where the real value of your property comes into play. Here are the 10 most costly mistakes in 2026 and the solutions to prevent them.

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### **1. Neglecting the waterproofing of wet rooms**
* **The mistake:** Omitting the sealing resin under the shower or balcony tiles.
* **The cost:** Infiltration among neighbors or mold on the walls. You have to break everything to do it again.
* **The solution:** Apply a **liquid waterproofing system (SEL)** before laying the tiles and require a water test.

### **2. Painting on a poorly prepared wall**
* **The error:** Apply the paint to a coating that is still damp or poorly sanded.
* **The cost:** The paint blisters or peels within a few months.
* **The solution:** Use a moisture tester. The surface must be dry, dusted, and receive a quality **undercoat (primer)**.

### **3. Forget the expansion joints in the parquet floor**
* **The error:** Lay the parquet floor (laminate or solid) glued against the walls.
* **The cost:** With the humidity of Tangier, the wood swells and the ground "gondola".
* **The solution:** Leave a space of **8 to 10 mm** all around the room, hidden by the plinths.

### **4. Poor location of electrical outlets**
* **The error:** Place the sockets at random before defining the furniture layout.
* **The cost:** Use of unsightly extensions or obligation to bleed already painted walls.
* **The solution:** Create a precise **layout plan** (location of the bed, TV, work surface) before the electrical work.

### **5. Using unsuitable tiles (Porosity/Slippery)**
* **The mistake:** Putting polished (shiny) tiles in a bathroom or terrace.
* **The cost:** Serious falls or indelible stains on poor quality porcelain stoneware.
* **The solution:** Check the standards (R10 or R11 for exteriors) and choose **full body porcelain stoneware** for high traffic areas.

### **6. Poor slope of evacuations**
* **The error:** An insufficient slope in the Italian shower or on the terrace.
* **The cost:** Water stagnation, bad odors and slow infiltration.
* **The solution:** Require a minimum slope of **1.5 to 2%** and check it with a spirit level before installing the covering.

### **7. Low-end aluminum joinery**
* **The error:** Choose a single-glazed profile or one without a thermal break.
* **The cost:** Excessive condensation on windows and high air conditioning bills.
* **The solution:** In Tangier, **double glazing** is a necessity for thermal and acoustic insulation.

### **8. Tile joints too thin or of poor quality**
* **The error:** Making “edge to edge” joints without sufficient space.
* **The cost:** The tiles crack under the effect of micro-movements in the building.
* **The solution:** Respect a minimum joint of **2 mm** and use a water-repellent mortar.

### **9. Fix false ceilings without reinforcements**
* **The mistake:** Do not provide reinforcements behind the placo for heavy chandeliers or curtains.
* **The cost:** Tearing of the ceiling and risk of injury.
* **The solution:** Install lined rails or wooden plates where you will hang heavy loads.

### **10. Lack of coordination between trade bodies**
* **The error:** Calling in the painter before the plumber or electrician has finished his tests.
* **The cost:** Having to drill into a finished wall to repair a forgotten leak.
* **The solution:** Follow a **strict schedule**. We only begin finishing once the networks (water/air/electricity) have been tested and validated.

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> **Expert's opinion:** At **Groupe MS GTF Immo**, we apply a checklist after each technical step. Avoiding these mistakes means saving up to 20% of your overall project budget in the long term.

**Would you like a comparative quote for the finishing work on your apartment or villa?**

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