Energy efficiency upgrades in Portugal: costs and grants in 2026
By Kellogg Fairbank · Co-founder of remodel.pt · Last updated October 2026What's in this guide
- Double-glazed windows typically cost €180 to €220 per m², with a wider €120 to €300 range
- A 3 kWp solar system costs about €4,000 to €5,000 and a 5 kWp system €6,000 to €7,500
- Vale Eficiência ended on 30 June 2026, so budget as if no voucher is available
- An ADENE energy certificate is required for renovations above 25% of the property value
- Insulate and seal the building first, then size the heat pump and solar system
How much do energy upgrades cost in Portugal?
These are indicative ranges from supplier quotes and our own regional benchmark, and your quote will depend on the building, access and the brand. Treat them as a sanity check when you compare three written quotes.
| Upgrade | Typical 2026 cost |
|---|---|
| Double-glazed windows | €120 to €300 per m², commonly €180 to €220 |
| Solar PV 3 kWp installed | €4,000 to €5,000 |
| Solar PV 5 kWp installed | €6,000 to €7,500 |
| Battery storage | About €3,500 to €4,500 per 5 kWh |
| Heat pump (Cascais benchmark) | €4,600 to €10,500 |
Which grants and subsidies are still available in 2026?
A bank credit line for energy transition was announced in December 2025 under the Banco Português de Fomento (BPF), but we could not verify its current status. Banco de Portugal capped the TAEG on energy-transition credit at 8.9%.
Programmes change often. Check the Fundo Ambiental and the ADENE site before you sign a contract, and do not assume a subsidy applies retroactively to works already paid for.
What order should you do energy upgrades in?
A well-insulated roof and walls lower the heating and cooling load, so a smaller heat pump may be enough. Replacing windows in a leaky building without addressing insulation often disappoints. Plan the sequence with your contractor before you order equipment.
Roof and façade works can also trigger permits. See the permit process guide before you finalise scope.
Do you need an ADENE energy certificate?
The certificate is issued by a qualified expert registered with ADENE (the national energy agency). A before-and-after certificate also shows the benefit of your upgrades to a future buyer.
The EU renovation passport and EPBD rules are bringing more requirements. Our renovation passport guide covers what is coming.
How do you pay for energy upgrades?
Compare the loan cost against the energy saving, not only against the purchase price. A heat pump replacing electric resistance heating usually pays back faster than windows. Ask each contractor for an itemised quote so you can phase the work.
Staged payments tied to inspected milestones protect you if the work slips. This is how remodel.pt structures every project.
Frequently asked questions
Conclusion
Energy upgrades in Portugal pay off when they are sequenced well and priced transparently. The grant picture has changed, so plan on paying yourself and treat any subsidy as a bonus.
Ask for itemised quotes, confirm any grant in writing and keep the ADENE certificate for the sale.
- ADENE: energy certificates
- Fundo Ambiental: support programmes
- Banco de Portugal: credit rules and TAEG caps
Related reading: HVAC contractors in Portugal, DL 97/2026 renovation VAT, Renovation passport and EPBD
Kellogg is a former payments executive turned entrepreneur, with a family background in real estate. He has spent the past year bringing that experience to the Portuguese property market, and co-founded remodel.pt to apply the same rigor to how contractors are vetted.