Defect prevention: inspect while it is still cheap

What does defect prevention mean in construction?

Defect prevention means signing off building elements against a fixed inspection plan instead of collecting defects at the end. For every recurring element it is settled what is inspected, when it is inspected and who signs it off — usually at the points where something is closed up, handed over or built upon. What separates this from administering defects is the timing: the inspection happens before the defect arises, or before it becomes inaccessible.

Legal framework: Germany (Civil Code BGB, construction contract rules VOB/B, fee schedule HOAI). Other countries have different rules, and contractual agreements take precedence over the standard periods named here.

From experience to an inspection plan

Every company holds the knowledge of where the trades regularly come unstuck — it sits in individual heads. An inspection plan turns that into something transferable: one list per element type, with the same questions at every element, in the same order.

• By element type, not by tradeWhat is inspected is the flat entrance door, not "the drywall". Only then can the result be tied to an item.
• Check points instead of proseAn inspection question can be answered with yes, no or a value. Anything else produces records nobody can evaluate.
• A sketch and a description with itIf every check point states what the correct result looks like, even someone who has not trained in the trade can carry out the inspection.
• Adapt templates instead of reinventingThe first inspection plan comes out of a template and the last twenty defects on the same element.

Who inspects — and what self-monitoring achieves

The contractor's own inspection and the checks carried out by site supervision are two different things and do not replace one another. The contractor owes work free of defects and inspects it themselves. Site supervision inspects on a sample basis, closely where trades are supervision-intensive — and documents that it has inspected.

• Have self-monitoring documentedAn inspection record from the subcontractor is part of what they owe, not a favour.
• A sample is not the same as at randomThe selection follows the risk: a new firm, a difficult detail, a fault that recurred from the last walkthrough.
• QR code on the elementIf the checklist hangs on the element, it is filled in at the element — and not in the evening from memory.

Duties of site supervision

Inspecting and documenting in one step

With Construction Checklists the inspection plan becomes a working tool: each element type has its own list, sketches and descriptions explain the target condition, the QR code on the element opens the right checklist, and a negative check point turns straight into a defect with photo, location and responsible party. What was inspected is then on record — and whatever was not in order is already a live record.

See Construction Checklists