An energy-efficient renovation can improve indoor comfort, reduce heat loss and prepare a property for the future. However, new glazing, insulation, ventilation and heat pumps require a substantial investment. It is therefore sensible to check which subsidies and financing options may be available before work begins.
Several schemes support the renovation of existing homes in the Netherlands. The best-known options include the ISDE subsidy, the Energy Saving Loan provided by the National Heat Fund and local programmes such as the SVn Sustainability Loan. Eligibility depends on the property, the selected measures, the municipality and the homeowner’s personal circumstances.
Start with a complete renovation plan
A subsidy should not be the only reason to choose a particular improvement. Every measure must suit the technical condition of the property and the correct sequence of renovation work.
Good preparation begins with:
- assessing the existing property
- identifying heat loss and moisture problems
- selecting appropriate insulation and installation measures
- checking national and local support programmes
- collecting technical information and quotations
- scheduling the work in a logical order
A complete renovation plan prevents different contractors and installations from interfering with one another later.
ISDE for insulation and sustainable installations
The Investment Subsidy for Sustainable Energy and Energy Saving, commonly known as ISDE, is a national scheme for owner-occupiers improving an existing home. Subject to specific conditions, it can support insulation, energy-efficient glazing, heat pumps, solar water heaters, heat-network connections and certain other sustainable measures. From 2026, energy-efficient ventilation may also qualify when combined with one or more insulation measures.
Eligible insulation work may include:
- roof insulation
- cavity-wall insulation
- external-wall insulation
- floor or ground insulation
- attic-floor insulation
- suitable high-performance glazing
Each measure has its own technical requirements. The material, insulation value, treated area and installation method may all affect eligibility.
New windows and energy-efficient glazing
Replacing windows can reduce draughts and improve comfort. For a successful application, however, the technical specifications and documentation must be accurate.
Before ordering, verify:
- the type of glazing
- its insulation performance
- the total area being replaced
- whether frames, doors or panels are included
- which product details must appear on quotations and invoices
- which photographs and payment records must be retained
A vague invoice stating only that new windows were installed may not contain
enough information.
Combining insulation with ventilation
A well-insulated property retains heat more effectively, but it also becomes more airtight. Adequate ventilation must therefore form part of the renovation plan. Without proper ventilation, moisture, condensation and poor indoor air quality may develop. Possible solutions include mechanical extraction, demand-controlled ventilation and heat-recovery ventilation.
Insulation and ventilation should not be planned as separate projects. A successful energy renovation combines lower heat loss with a healthy supply of fresh air.
A heat pump requires technical preparation
A heat pump may qualify for support, but the property must first be assessed for
suitability.
Important factors include:
- the existing level of insulation
- the property’s heat-loss calculation
- the current heat-distribution system
- available indoor and outdoor space
- noise considerations
- the electrical installation
- the technical specifications of the selected system
Installing a heat pump in a poorly insulated property will not automatically deliver the expected comfort. Insulation may need to come first.
Energy Saving Loan from the National Heat Fund
Where a subsidy does not cover the full renovation, the Energy Saving Loan may provide additional financing. It is intended for owner-occupiers who want to improve the energy efficiency of an existing home.
The financing can be used for approved sustainability measures. Funds are generally managed through a construction deposit, from which invoices for completed work are paid. The application is assessed according to the property, the planned measures and the applicant’s financial circumstances.
Potential measures may include:
- home insulation
- energy-efficient glazing
- heat pumps
- efficient ventilation
- other approved sustainable installations
The current conditions should always be checked before entering into any contractual obligations.
Sustainability Loan through municipalities and SVn
Some municipalities and provinces offer a Sustainability Loan in cooperation with SVn. It is intended for work that improves the energy performance or sustainability of a home.
Availability and conditions differ by region. The local authority determines which measures qualify and who may apply. A formal allocation from the municipality or province is generally required before SVn assesses the financial application. The financing is commonly managed through a construction deposit.
Before applying, check:
- whether the scheme is available for the property address
- which measures are approved locally
- which documents the municipality requires
- whether approval is needed before work begins
- how the financial assessment is conducted
A scheme available in one municipality may not exist in the neighbouring area.
Can subsidies and financing be combined?
In many cases, a subsidy may be combined with a loan. The subsidy reduces part of the final cost, while financing helps cover the remaining investment.
The exact possibilities depend on the conditions of each scheme. Before proceeding, confirm:
- which costs qualify for subsidy
- which costs may be paid from the loan
- when each application must be submitted
- whether the same invoice can be used for both schemes
- how the subsidy will be handled within the construction deposit
Combining different forms of support can be useful, but it requires careful
administration.
Which documents should be retained?
Documentation is just as important as the physical work. Missing technical information can delay an application or prevent approval.
Keep:
- signed quotations
- detailed invoices
- proof of payment
- technical product data
- product or notification codes
- photographs before, during and after the work
- contractor and installer details
- correspondence relating to the application
Before construction begins, confirm which information must appear on the final invoices.
“In an energy-efficient renovation, technical design, scheduling and documentation must be aligned from the beginning. Even well-executed work can create problems when the supporting documents are incomplete. That is why we include the necessary technical information and evidence in the preparation of the project.” — Robert Siutkowski, CEO Renoverend
How can Renoverend help with the documentation?
Renoverend can help organise the technical information required for renovation documentation. This does not mean guaranteeing approval for a subsidy or loan. It means making sure that the completed work is described clearly and supported by relevant records.
Support may include:
- clear descriptions of the work
- technical information about materials
- specifications for insulation and installations
- organised quotations and invoices
- photographs of important construction stages
- coordination between contractors and installers
The homeowner remains responsible for the application and for checking the current conditions. A well-prepared renovation file can nevertheless make the process much easier to manage.
The best financing strategy begins not with an application form, but with a technically sound renovation plan.
FAQ
1. Which renovation measures may qualify for support?
Depending on the conditions, insulation, high-performance glazing, heat pumps, solar water heaters and certain ventilation measures may qualify.
2. Should I apply before or after the work?
This depends on the programme. Some subsidies are claimed after installation, while local financing may need to be arranged in advance.
3. Can ISDE be combined with a loan?
It may be possible. Check how the subsidy will be processed within the selected financing and construction deposit.
4. Does every heat pump qualify?
No. The system and installation must meet the current technical requirements.
5. Is the Sustainability Loan available in every municipality?
No. Each municipality or province decides whether it offers the scheme and which conditions apply.
6. Can Renoverend submit the subsidy application?
Renoverend can provide technical details, quotations, invoices and project documentation. The formal application remains the homeowner’s responsibility.
