Insulation grants in Flanders: 2026 rules and 2027 updates
Planning cavity wall, roof or external wall insulation in Flanders? Find out which Mijn VerbouwPremie rules have applied since 1 March 2026, who may qualify and what is changing for applications in 2027.
Content last reviewed: 15 November 2026
How much insulation grant is available in 2026?
Since 1 March 2026, owner-occupiers in income categories 1 and 2 are no longer eligible for Mijn VerbouwPremie for roof, floor or external wall insulation. Applicants in categories 3 and 4, and landlords renting to a social housing company, may still qualify under specific conditions.
| Insulation work | ✓Income category 1 | ✓Income category 2 | ✓Income category 3 | ✓Income category 4 |
|---|---|---|---|---|
| Roof insulation | Not applicable | Not applicable | Up to €4,025 (max. 35% of the invoice) | Up to €5,750 (max. 50% of the invoice) |
| Floor insulation | Not applicable | Not applicable | Up to €1,050 (max. 35% of the invoice) | Up to €1,500 (max. 50% of the invoice) |
| Wall insulation | Not applicable | Not applicable | Up to €3,500 (max. 35% of the invoice) | Up to €5,000 (max. 50% of the invoice) |
The amounts shown are maximum grants per work category, based on eligible invoices excluding VAT. For roof, floor and external wall works, the minimum invoice is generally €1,000 excluding VAT. The final award depends on the application date, applicant category, invoices and technical requirements. Indexed income thresholds apply to applications in 2027.
What is Mijn VerbouwPremie?
Mijn VerbouwPremie is a grant provided by the Flemish government for renovation work and energy-saving investments in houses and apartments located in the Flemish Region.
The most relevant categories for insulation projects are roof, floor and external walls. Cavity wall insulation with EPS beads and new external wall insulation behind render fall under external wall works. Façade finishing without new insulation does not automatically qualify.
The date you apply determines the applicable rules and income thresholds. Check the property, income category and technical requirements for your insulation project before relying on a grant.
Who qualifies for an insulation grant?
Since 1 March 2026, owner-occupiers in income categories 3 and 4 may still qualify for Mijn VerbouwPremie for roof, floor and external wall insulation. Landlords renting to a social housing company may also be eligible, subject to conditions.
The house or apartment must be located in the Flemish Region and must have been connected to the electricity distribution network before 1 January 2006, or first occupied before that date according to cadastral records.
Your income category is determined using the most recently available tax assessment at the time of application.
An owner-occupier who also fully owns another house, apartment or building plot is automatically placed in income category 1.
| Household situation | Category 4 | Category 3 |
|---|---|---|
| Single person | Up to and including €24,750 | Above €24,750 up to €43,240 |
| Couple or single person + 1 dependant | Up to and including €37,110 | Above €37,110 up to €60,520 |
| Per additional dependant | + €4,420 | + €4,420 |
These thresholds apply to applications submitted in 2026. Indexed thresholds take effect on 1 January 2027. Use the official simulator for your application year.
Which insulation works are eligible?
The external wall category may include insulating an existing cavity and installing new external wall insulation. Roof and floor insulation may also qualify if the technical and administrative requirements are satisfied.
Roof insulation
New roof or attic-floor insulation may qualify when it meets the technical requirements of the scheme.
- ✓The newly installed insulation must achieve an Rd value of at least 4.5 m²K/W.
- ✓When insulating a pitched roof from the inside, a correctly installed vapour barrier is required.
Cavity wall insulation
Insulating a suitable existing cavity may qualify under Mijn VerbouwPremie for external walls. It is a grant for eligible installation work, not a separate subsidy for buying EPS beads.
- ✓The cavity must be completely filled, be at least 50 mm wide and the insulation material must have a maximum lambda value of 0.065 W/mK.
- ✓The work must be carried out by a contractor recognised under STS 71-1. A Statement of Conformity (VVO) under STS 71-1 must accompany the application. An already partly insulated cavity does not qualify for additional filling.
External wall insulation
Insulating an external wall from the outside may also qualify, including façade renovation combined with insulation and render.
- ✓New external wall insulation must achieve an Rd value of at least 3 m²K/W.
- ✓Rendering can be included when combined with sufficient new external wall insulation on the outside of the façade. Render without new external wall insulation, or render combined only with new cavity wall insulation, is not eligible as an associated finish.
The application date, property, type of work, invoices and technical conditions all affect eligibility. The official rules on Vlaanderen.be take precedence.
Cavity wall insulation: what ATG 3170 and STS 71-1 mean
For cavity wall insulation, both the approved insulation system and correct installation matter. Nu-Isoleren uses bonded Isomo EPS beads and carries out cavity insulation in accordance with STS 71-1.
ISOMOPEARLS — ATG 3170
ATG 3170 is the technical approval for Isomo’s ISOMOPEARLS insulation system. It applies to the system and is not, by itself, a company certificate issued to Nu-Isoleren.
Installation under STS 71-1
Nu-Isoleren operates as an installer recognised under STS 71-1. An STS 71-1 Statement of Conformity (VVO) is required when applying for the cavity wall grant.
Check your eligibility
Correct installation alone does not guarantee a grant. Your income, the property, invoices and application date also matter.
The installer’s current recognition and its own STS/BCCA registration number must be verifiable. The Flemish authorities decide whether a grant is awarded.
How do you apply for Mijn VerbouwPremie?
The grant application is submitted after the work has been completed and the required invoices and certificates are available.
Have the insulation work completed
Roof and external wall insulation must be carried out by a contractor. Certain techniques require additional contractor certification.
Collect your invoices and certificates
Keep the final invoice, any advance or interim invoices and the relevant contractor certificate. Cavity wall insulation also requires the STS 71-1 Statement of Conformity (VVO).
Apply through Mijn VerbouwLoket
Submit your application online through the official Mijn VerbouwLoket, separately for each category of work.
Track your application
After submission, you can follow the application through Mijn VerbouwLoket. The authorities may request additional supporting documents.
Apply after the work is completed. Your final invoice must be no more than 24 months old on the application date. Older advance or interim invoices may be excluded from the grant calculation.
Mijn VerbouwPremie 2027: confirmed changes and proposals
Indexed income thresholds have been published for applications from 1 January 2027. You can check your circumstances using the official simulator for 2027. Grant amounts and eligibility still depend on the work category and applicant.
A draft extension would allow some private landlords offering affordable rents, holding a conformity certificate and renting for at least three years to access a 35% grant under certain conditions. An additional 10% bonus on top of the current 50% rate is also proposed for landlords renting to a social housing company for at least nine years.
The Flemish Government gave the proposal a second approval in principle on 23 October 2026. It is not final legislation as of 15 November 2026; implementation is planned for 2027. Proposed support must not be presented as an existing entitlement.
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