Guide
What to check before buying an old building in Porto
An estate agent sells the potential. Before you sign a CPCV, someone should look at the building the way a builder will — because that is what determines your final cost.
1. Structure and timber
- Most Porto buildings have timber floors and roofs on granite party walls. Look for sagging floors, springy boards and repaired ceilings.
- Check the roof structure from the attic: rot at beam ends where timber meets stone is the classic failure.
- Cracks that follow a diagonal across openings suggest movement, not just plaster.
2. Water and damp
- Rising damp on the ground floor and lateral damp on party walls are common and expensive to solve properly.
- Check gutters, downpipes and the rear facade — the back of the building is where neglect shows.
- Ask when the roof was last intervened on, and by whom.
3. Party walls and neighbours
- You share walls, and often the roof, with adjoining buildings. Works may require access or agreement.
- In a condominium, read the minutes: pending works and debts transfer with the fraction.
4. Heritage and planning rules
- Much of the centre sits in protected zones (ARU/UNESCO buffer). Facades, windows, tiles and roof profiles are controlled.
- Adding a floor, a lift or new openings is not a given — verify feasibility before you price the project.
- Rehabilitation in an ARU can also unlock tax and VAT benefits. Confirm eligibility in writing.
5. The paperwork
- Caderneta predial and Certidão permanente — areas and ownership must match reality.
- Licença de utilização and the municipal process file: check what was legally approved versus what is built.
- Energy certificate, ficha técnica de habitação, and any pending municipal notifications.
Do this before the CPCV
The promissory contract is where leverage disappears. A technical visit and a feasibility check before signing usually costs a fraction of one surprise on site, and it gives you grounds to renegotiate or walk away.
Next: what renovation actually costs in Porto, or how owner's representation works in Porto.