5 Hidden Defects That Can Ruin Your Design Project and How to Detect Them in Advance
Publication date: March 12, 2025
An interior design project is not just about aesthetics — it’s about functionality, safety, and comfort. However, even the most well-thought-out design can face unexpected challenges if hidden defects are discovered during renovation or construction. These issues can lead to additional costs, project delays, and, in some cases, make project completion impossible.
To avoid unpleasant surprises, it is crucial to assess the condition of structural elements, utility systems, and finishing materials in advance. In this article, we will discuss five of the most common hidden defects that designers and builders encounter, as well as effective diagnostic methods that can help minimize risks and keep the project budget under control.
1. Uneven Walls and Angles
Why is this a problem?
Uneven walls, deviations from the vertical, and corners that do not meet 90° can significantly complicate the execution of a design project. Furniture installation, decorative panel application, or tile laying will require additional adjustments, increasing renovation costs.
How to detect it?
- Check wall flatness with a laser level during the property inspection.
- Measure deviations using a plumb bob and tape measure.
- Visually inspect wall and ceiling joints for cracks and misalignments.
How to avoid problems?
If irregularities are discovered before finishing work begins, the developer is obliged to fix them under their warranty obligations. However, if defects are identified during renovation, the responsibility falls on the homeowner.
In such cases, wall leveling with plaster or drywall will be necessary, resulting in additional costs, extended renovation timelines, and reduced usable space.
To avoid unnecessary expenses and maintain the original interior concept, it is crucial to inspect wall conditions in advance using a laser level or other precision measuring tools. This allows for timely detection of deviations and, if necessary, the ability to demand corrections from the developer.
2. Electrical Issues and Outlet Placement
Why is this a problem?
Developers often place outlets and switches in inconvenient locations or make mistakes in electrical wiring. As a result, the design project has to be adjusted to fit the existing scheme, or costly modifications must be made.
How to detect it?
- Conduct a technical inspection of the property and test electrical connections.
- Check all outlets and switches using a voltage tester.
- Compare the placement of electrical points with the furniture layout.
How to avoid problems?
To prevent rework and additional costs, create an electrical plan in advance and coordinate it with the contractor before starting work.
If errors in electrical wiring are detected during the inspection, the developer must fix them at no extra cost. However, correcting such defects during finishing work may require wall chasing, rewiring, and extra expenses.
3. Hidden Plumbing Issues
Why is this a problem?
Incorrectly installed pipes, leaky joints, or weak water pressure can lead to leaks that damage interior finishes, requiring costly repairs.
How to detect it?
- Conduct a pre-purchase inspection with a focus on plumbing fixtures.
- Test water pressure by turning on all faucets simultaneously.
- Examine pipes and connections with a flashlight for leaks and rust.
How to avoid problems?
If defects are detected during the inspection, document them immediately and demand corrections from the developer.
Otherwise, fixing these issues will be the homeowner’s responsibility, potentially requiring removal of finishes, system component replacements, and higher costs.
4. Poor Soundproofing
Why is this a problem?
Noisy neighbors, elevator sounds, or voices through the walls can severely affect home comfort. A designer may suggest decorative soundproofing panels, but such solutions are not always effective for serious noise issues.
How to detect it?
- Review the technical inspection report on the property’s condition, if available.
- Perform a sound test by tapping on walls and ceilings to identify hollow spaces.
- Arrange a noise-level test with neighbors by closing doors and windows.
How to avoid problems?
If soundproofing is insufficient, it’s crucial to take action before finishing work begins to avoid extra costs and complications later. One effective solution is installing soundproofing panels, which reduce noise levels and improve room acoustics.
Additionally, special drywall with built-in soundproofing can be used, helping both to level the walls and enhance noise insulation. Other effective measures include sound-absorbing membranes, acoustic mineral wool, or vibration-isolating fasteners. These solutions significantly reduce unwanted noise penetration, making the space more comfortable for living.
5. Ventilation and Indoor Climate Issues
Why is this a problem?
Poor ventilation can lead to mold growth, unpleasant odors, and stale air, which is especially problematic for kitchens and bathrooms. Without proper airflow, excess moisture accumulates, increasing the risk of mildew and structural damage.
How to detect it?
- Perform a flame or thin paper strip test—the flame should be drawn toward the exhaust vent.
- Use a hygrometer to measure humidity levels.
- Inspect ventilation ducts with a mirror or flashlight to check for blockages.
How to avoid problems?
If the ventilation system is ineffective, it’s crucial to address the issue before finishing work begins to prevent poor air quality and mold formation.
One of the best solutions is installing forced ventilation, such as an exhaust fan, heat recovery unit (HRV), or supply and exhaust system. For high-humidity areas like bathrooms and kitchens, additional ventilation devices with humidity sensors or timers can ensure efficient air exchange and prevent condensation buildup. These measures will significantly improve indoor air quality, maintaining a healthy and comfortable living environment.
How Can We Help Designers?
At PKB, we specialize in professional apartment inspections, identifying hidden defects and technical issues before renovation begins. This proactive approach minimizes risks, reduces unexpected costs, and prevents costly rework. Our expertise helps interior designers by:
- Identifying defects in advance, such as uneven walls or communication system issues.
- Ensuring defect corrections at the developer’s expense, saving the client from additional costs.
- Optimizing the project budget by addressing problems early in the inspection stage.
- Streamlining contractor workflows to avoid delays in project implementation.
We also offer a partnership program for interior designers — a 10% commission for each client who undergoes our technical apartment inspection.
Optimize Your Project Without Unnecessary Problems
Identifying hidden defects before renovation isn’t just an extra precaution — it’s a critical step that helps prevent unexpected costs, delays, and technical issues during the implementation of your design project.
Collaborating with professionals who inspect construction quality allows interior designers to save time, protect the client’s budget, and ensure flawless results. If you want your project to proceed smoothly, we are ready to handle inspection and risk assessment for you. Contact us today to discuss partnership details!
