Portugal's 2026 IMI construction benchmark just rose to €570/m², here's what it means

Why did Portugal raise the construction cost benchmark to €570/m²?

Portugal's IMI system doesn't tax what you paid for a property, it taxes a formula-derived value, the Valor Patrimonial Tributário (VPT). One input to that formula is the government's own estimate of what construction actually costs per square metre nationally. Because material, labour, and energy costs climbed through 2025, the same trend shows up from the contractor side further down this guide, the benchmark moved up in step. With the 25% land-value addition required by law, the effective figure tax inspectors use is €712.5/m².

Foreign property owners rarely track this number because it's a technical adjustment buried in a Diário da República notice, not a headline tax change. But it's the quiet mechanism behind future IMI increases, especially for anyone renovating.

How does this benchmark affect your renovated property's tax bill?

For a property last assessed in the past two or three years and untouched since, nothing changes yet. But two triggers reopen the valuation:

• Filing a fresh Modelo 1 after finishing a substantial renovation (obra de melhoramento)
• Municipal reassessment cycles, which councils can initiate independently

Once reassessed, the property's VPT is recalculated using the new €712.5/m² land-inclusive figure, almost always higher than whatever base value the property carried before. The município then applies its own IMI rate (0.3%–0.45% for urban property, set annually by each câmara) to the new VPT to produce the actual bill.

Which renovations trigger a fresh VPT evaluation?

This is the point where remodel.pt's Contractor Trust and Quality & Inspection standards both matter: an alvará-verified contractor working from a properly scoped, permitted project plan will flag if the renovation crosses into "substantial" territory before it's too late to plan around it. Unpermitted structural work, extending livable area, altering load-bearing walls, adding a floor, almost always crosses the line, and Simplex Urbanístico (DL 10/2024) liability for unpermitted works falls on the current owner regardless of who built it.

What does a renovation actually cost in 2026?

During the spring renovation peak (March–May), Lisboa lead times can stretch 8–12 weeks before a crew is available, a scheduling reality that compounds the tax-timing question below.

How can foreign owners budget for both renovation and the new IMI exposure?

This is the crux of the news hook: the €570/m² benchmark rise doesn't cost anything on its own. It becomes a cost the moment a renovation is scoped as "substantial" and filed. remodel.pt connects foreign owners with alvará-verified contractors for a written, itemised scope, so the owner can see, before committing, whether a project is likely to trigger reassessment and budget the resulting IMI increase alongside the renovation cost itself.

Regional cost & tax variation: Lisboa vs Coimbra vs Algarve

Frequently asked questions

Conclusion

Portugal's 2026 construction cost benchmark increase is a technical adjustment with a real consequence: it raises the tax cost of renovating, but only for owners who don't plan around it. A written, alvará-verified project scope, the same document that protects against contractor overcharging and Simplex liability, is also the tool that shows whether a renovation is about to trigger a VPT reassessment.