More and more homeowners in Groningen are investing in sustainable home retrofits. The benefits are clear: lower energy bills, improved living comfort, and increased property value. In this article, we discuss the possibilities and available subsidies.
Why make your home sustainable?
Many property owners choose sustainability retrofits to save energy, increase home comfort, and future-proof their dwellings. In addition, national and regional subsidies are available for insulation and heat pumps. Always check the latest terms and conditions, as subsidy rates and eligibility criteria change periodically.
Sustainability measures and costs
The figures below are rough indications. Retrofitting can turn out more affordable or more expensive depending on existing insulation levels, site accessibility, floor area, choice of materials, heating plant selection, and subsidy stipulations. Request a free site survey and quote if you want to know which measures will yield the highest return and what they will cost for your specific property.
Cavity wall insulation: €1,200 to €3,500
Many properties in Groningen have external cavity walls suitable for insulation injection. Whether this is viable for your home depends on construction year, facade condition, and any pre-existing cavity fill.
Roof insulation: €2,500 to €7,000
Roof insulation with PIR boards or mineral wool drastically restricts heat loss through the roof structure. Payback time and savings depend on roof surface area, current insulation values, energy consumption, and installation details.
HR++ double glazing: €2,500 to €7,000
Replacing single glazing or dated double glazing with high-efficiency HR++ glass makes an enormous difference to thermal efficiency and acoustic dampening.
Hybrid heat pump: €3,500 to €6,000
A hybrid heat pump teams an electric air-source unit with your existing combi boiler. Efficiency gains depend on insulation quality, heat emitter sizing (radiators/underfloor), and heating behavior.
All-electric heat pump: €6,000 to €12,000
A fully electric heat pump heats the house entirely without gas. Ideal in conjunction with thorough insulation and low-temperature underfloor heating.
Solar panels (PV): €3,500 to €7,000
Solar panels generate electricity for immediate domestic consumption or grid feed-in. Calculate the investment against your household energy consumption, roof orientation, and current net-metering regulations.
What makes sustainability work cheaper or more expensive?
A retrofit project is generally more economical when multiple measures are combined. If your house is already undergoing roof work, window replacements, or remodeling, adding insulation and pipework adjustments can be coordinated far more efficiently. Subsidies can also reduce net investment, provided each measure fulfills official criteria.
Projects become more expensive when accessibility is restricted, when existing plumbing and electrical systems require upgrades, or when underlying structural repairs must precede insulation. In older properties, tailored solutions are crucial, as incorrect insulation installation can trap moisture and cause rot. We always evaluate the building fabric thoroughly before recommending measures.
Available subsidies in 2026
ISDE Subsidy
The Investment Subsidy for Sustainable Energy and Energy Conservation (ISDE) provides grants for insulation, heat pumps, and other energy-saving measures. In 2026, adjustments include subsidies for energy-efficient mechanical ventilation when combined with insulation. Specific amounts depend on the measure, surface area, product registration codes (meldcodes), and conditions. Always verify current criteria with RVO or Milieu Centraal.
Municipal subsidies
Various municipalities in Groningen offer supplementary local grants or low-interest sustainability loans. Check your local municipal council website for active schemes.
National Heat Fund (Nationaal Warmtefonds)
Through the Nationaal Warmtefonds, homeowners can secure favorable, low-interest loans specifically earmarked for home energy improvements.
Real-world project: Willem Lodewijkstraat, Leeuwarden
At a residential property on the Willem Lodewijkstraat in Leeuwarden, we carried out a comprehensive sustainability retrofit:
- Cavity wall insulation
- Roof insulation using high-performance PIR boards
- High-efficiency HR++ glazing throughout the entire house
- Installation of a hybrid heat pump system
The outcome: an energy label jump from D to A. The residents experienced an immediate surge in indoor comfort and a steep drop in monthly utility bills.
Getting started with sustainability
Curious which sustainability measures will deliver the best return for your property in Groningen? Heidstra Bouw provides expert, practical advice. We visit your property, inspect the current state of insulation, and prepare a tailored action plan complete with subsidy guidance. Explore our sustainability service page and our regional hub building company Groningen.
Contact us at info@heidstrabouw.nl or call 06-36549707 for a free consultation.
