AC Expertises

Building expertise in Luxembourg

Building defects expert

We compare what was actually done against what was agreed, and describe each defect precisely enough to demand it is put right.

Request a survey

Fast reply. You can also call +352 691 322 326.

  • Independent expert
  • Report you can use with your insurer, your contractor or the court
  • Site visits throughout Luxembourg
+352 691 322 326

A building defect is not a matter of taste. It is a gap between the finished work and what the quote, the plans, the product specifications and standard practice required. Until that gap is described in technical terms, a contractor can always claim the result is acceptable.

We record these gaps one by one: tolerances exceeded, non-compliant products, incorrect installation, a step skipped altogether. We state which standard was not met and what effect the defect will have on the durability of the work.

This level of precision makes all the difference in a dispute. A letter saying the work is poor achieves nothing. A report listing twenty non-conformities, with photographs and references, gets the work redone, or secures compensation.

When we can help

The tiling or flooring is defective

Uneven surfaces, irregular joints, delamination, a hollow sound underfoot. We measure the deviations and check the substrate and the method of laying.

The waterproofing was poorly done

A terrace, a bathroom, a balcony, insufficient upstands. These defects prove very costly later, as they damage the surrounding work as well.

The insulation has gaps

Panels poorly jointed, a punctured vapour barrier, thermal bridges left in place. We record the evidence before everything is closed up, while it is still possible.

Render or paint is deteriorating quickly

Crazing, blistering, peeling within months of handover. We look for what, in the substrate or the application, explains the defect.

The contractor has walked off the job

We establish the real state of progress, what remains to be done, and what will need to be demolished, before another contractor takes over.

The windows and doors do not close properly

Poor installation, missing sealant, adjustments never made, badly treated sills. These defects lead to infiltration and heat loss.

Why call in an expert

Your complaints become precise

Every defect is named, located and measured. The contractor can no longer claim it is normal.

You know what needs to be demolished

Some repairs are cosmetic, others require a complete redo. The report settles this often contested point.

You protect your warranties

We act within the time limits that matter, so that defects are reported in time, before your rights weaken.

Unsure about your building? Have it assessed.

Describe your situation in two minutes. We call you back and arrange the site visit.

How the survey works

  1. 01

    First contact

    We review the works carried out, the contractual documents and the state of your correspondence with the contractor.

  2. 02

    On-site visit

    We inspect the work concerned, with measurements and photographs, and we record every non-conformity, including ones you may not have noticed.

  3. 03

    Analysis

    We compare our findings against the quote, the plans, the product specifications and the applicable standards of workmanship.

  4. 04

    Report

    You receive the full list of defects, the repair expected for each one, and costings where you need them.

The expert report

The report takes the form of a numbered schedule. For each point: location, photograph, description of the defect, the standard not met, and the repair expected.

This document can be sent as it stands to the contractor, its insurer, your solicitor or a court expert. It also serves as the basis for getting the repairs costed by another company.

What the report contains

  • Numbered schedule of the defects found
  • Located photographs of each defect
  • Contractual or technical standard not met
  • Nature of the repair required
  • Costing of the repair works on request

Where we work

We record building defects on sites of every size, right across Luxembourg.

Our visits cover Luxembourg City, Esch-sur-Alzette, Differdange, Dudelange, Ettelbruck, Diekirch, Mersch, Strassen, Bertrange and Mamer, as well as other municipalities across the country.

Luxembourg-Ville, Esch-sur-Alzette, Differdange, Dudelange, Ettelbruck, Diekirch, Mersch, Strassen, Bertrange, Mamer.

Frequently asked questions

A defect exceeds accepted tolerances or departs from standard practice. An imperfection that stays within tolerance is not a defect, even if you find it unsatisfactory.

As quickly as possible. Some visible defects must be flagged at the point of handover, while others fall under warranties whose time limits start running from that date.

That is a legal question, best confirmed with a solicitor. From a technical standpoint, our report establishes the reality and scale of the defects, which supports that discussion over the balance due.

In a dispute, yes. Findings made with the contractor present are much harder to challenge afterwards.

Yes, when the case calls for it. We break the costs down by item so the total can be checked line by line.

We document the state of the works, what can still be used and what needs redoing. This is useful for the insurer, for the liquidation process, and for bringing in another contractor to finish the job.

Related surveys

Have the defects recorded

List the defects you have noticed. We come and document them with the precision needed to demand they are put right.

AC ExpertisesArap CETIN, Expert en bâtiment
21 rue du puits romain (Bâtiment Colors Business Center), L-8070 Bertrange