The single consent
Since 2017 the planning permit and the environmental permit have been merged into a single omgevingsvergunning. Applications are made electronically through the regional portal.
| Procedure | Consent period |
|---|---|
| Simplified | 60 days |
| Ordinary | 105 days |
These are the shortest periods of the three regions. For a project carrying external finance, the gap with Brussels represents several months of interest and fixed costs.
Three further elements complete the system and are needed before costing. They concern the single permit, the renovation obligation and the grants.
The notification duty. Certain works exempt from consent must still be notified to the municipality. An exemption is therefore not always an absence of formality.
The regulatory lists. Exemptions and notifications sit in separate decrees. They cannot be inferred from the Walloon or Brussels lists.
The demolition monitoring plan. For demolition above a certain volume, a monitoring plan is mandatory. Preparing it is a study cost in its own right, to be included from the estimate stage.
The renovation duty after purchase
This is the Flemish feature with the heaviest financial consequences, and it affects the purchaser more than the builder. It applies after acquisition and not during construction.
Flanders imposes a renovatieplicht: after acquiring a property with insufficient energy performance, the new owner must carry out works within a set period to reach a minimum level. The period runs from the deed and not from letting.
Two consequences for estimating.
The renovation budget is not optional. It becomes a programmed charge from the deed onwards, altering the financial balance of an acquisition and belonging in the funding plan.
The timetable constrains phasing. Works cannot be spread freely, which limits the trade-offs between stages and reduces the ability to smooth expenditure.
The exact scope of properties affected, the level required and the applicable period follow from Flemish regulation in force and must be checked case by case. That check therefore precedes any offer to purchase.
The grant scheme was narrowed
The Flemish scheme changed direction in 2026, and this alters the logic of support. Support is refocused on a narrower set of works.
Since 1 March 2026 the principal grant has been restricted to lower-income households. Higher income categories retain only limited access, for certain installations.
Compensation shifted from grant to loan. The regional loan scheme was widened, with raised ceilings and progressive rate conditions by income.
For estimating this shifts the question. No longer "which grant can I obtain" but "at what cost can I finance". A Flemish project whose funding plan predates 2026 must be recalculated.
What weighs specifically on Flemish cost
Four items distinguish Flanders at equivalent brief. They relate to procedures, requirements and the local market.
Lower carrying cost. Periods of 60 to 105 days against 160 in Brussels represent a real saving on financed projects.
The demolition monitoring plan. A specific study item, absent from budgets modelled on other regions.
The level of energy requirement. Flanders applies its own indicators and thresholds, not transferable from Walloon or Brussels terminology.
Finance cost rather than grant. The shift to loans moves the burden from capital budget to cost of capital.
The vocabulary does not translate
A useful warning for any professional working on both sides of the language border. The regimes do not carry over from one region to another.
Flemish technical terms are not translations of Walloon or Brussels ones: they are autonomous legal concepts defined in separate texts. The omgevingsvergunning is not a translated planning permit but a consent of wider scope.
Likewise the energy performance indicators carry different names and do not cover exactly the same quantities. An approximate equivalence between regions produces a wrong estimate.
What this means for an estimate
Three practical rules.
Check the list of exemptions and notifications applicable in Flanders, without inferring it from another region.
Include the renovation duty in acquisition-and-refurbishment projects, with its timetable and not merely its amount.
Recalculate funding plans drawn up before March 2026, because the logic of support has changed in nature.
This article reflects the position of the rules at the date of checking and serves professional orientation. It does not constitute legal advice and does not replace assessment of the individual case.