In Belgium

A hidden defect (vice cache / verborgen gebrek) is a flaw in the rented property that was not apparent at the time the lease was concluded and that renders the property unfit for its intended use or significantly reduces the tenant’s enjoyment of it. Under Belgian law (Articles 1721 and 1641 et seq. of the Civil Code), the landlord bears a warranty obligation for hidden defects.

Conditions for a valid claim:

  • The defect must be hidden (not detectable through a normal inspection)
  • It must be serious (substantially impairing habitability or use)
  • It must have pre-existed the lease (or the sale, in property transactions)

How it works

Discovery. The tenant discovers a problem — severe dampness behind wall panels, faulty electrical wiring concealed in walls, structural issues not visible to the untrained eye.

Notification. The tenant must inform the landlord promptly after discovery, preferably by registered letter. Delay in notification can weaken the claim.

Landlord’s liability. The landlord is liable regardless of whether they knew about the defect. If they did know, they may also owe damages beyond mere repair costs.

Remedies:

  • Repair at the landlord’s expense
  • Rent reduction proportional to the diminished enjoyment
  • Judicial termination of the lease with damages
  • Damages for consequential losses (e.g. damaged personal belongings)

Expert assessment. The justice of the peace often appoints a court expert to determine whether the defect qualifies as hidden and pre-existing.

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Good to know
A clause in the lease stating the tenant accepts the property “as is” does not exempt the landlord from the hidden defect warranty. Such clauses only cover visible defects. The landlord remains liable for defects that a normal inspection could not reveal.

Practical example

Six months after moving in, a tenant discovers that the ground floor apartment floods every time it rains heavily, due to a defective waterproofing membrane beneath the flooring. The entry inventory showed no signs of water damage. An expert confirms the defect pre-existed the lease. The justice of the peace orders the landlord to carry out repairs (estimated: 8,000 EUR) and grants the tenant a 25% rent reduction for the 6-month period of disturbance of enjoyment.