ABEX index: what an indexed estimate really changes for your renovation

When you apply for a renovation loan, the figure you present to the bank doesn't carry the same weight depending on how it was produced. A price an installer recalls from memory and an ABEX-indexed amount don't defend themselves the same way. The difference comes down to an index few homeowners know — but that every expert, insurer and credit officer uses.

The ABEX index, in one sentence

The ABEX index is the official Belgian construction-cost index. It is published twice a year — in May and November — by the Association of Belgian Experts (ABEX). In practice, it translates the movement in building materials and labour prices into a single number.

For the first half of 2026, the index stands at 1056. That number means nothing on its own: what matters is its variation. When the index climbs, rebuilding or renovating mechanically costs more. When it steadies, so do budgets.

Why it moves every six months

Construction has no fixed price. The cost of steel, timber, insulation, site fuel and wages shifts constantly. ABEX aggregates these movements and publishes a new index each half-year. An estimate calculated with the November index is therefore not quite the same as one calculated the following May — even for identical works.

That's why an "indexed" estimate always states the index value used and its date. Without that, a renovation figure is implicitly dated but impossible to verify.

What indexation changes for your bank file

Belgian banks have tightened their requirements on renovation files. An undated estimate, with no VAT, no company number, is increasingly sent back. The reason is simple: the bank lends against a cost it must be able to justify internally. An amount tied to the ABEX index ticks that box immediately.

• It's traceable. Each line points to an official reference, not an intuition.
• It's dated. The bank knows when the cost was set and on what basis.
• It's consistent. Two comparable properties give comparable amounts — which a case-by-case negotiated price never guarantees.

That is exactly what a Qote report produces: an estimate where every line is calibrated on the current ABEX index, signed off by an expert, and presented in a format your bank, insurer or notary recognises.

ABEX index and grants: two numbers not to confuse

The ABEX index gives you the gross cost of the works. Regional grants — Renolution in Brussels, Mijn VerbouwPremie in Flanders, Primes Habitation in Wallonia — then reduce that cost. The figure your bank really cares about is the amount left to finance: indexed cost minus matched grants. A good estimate computes both in the same document.