THE 10% CITY
from the Lisbon City Signals
the problem
Lisbon is changing faster than the people who live in it. New residents arrive. Rents rise. Shops turn over. Neighbours move out. The rhythm of a street changes.
None of it comes in one big decision. It comes in small steps that each look manageable on paper. Graça, Alfama, Mouraria, Santos and Marvila don’t just develop. They tip. By the time everyone agrees something’s wrong, the social fabric has already moved on.
Lisbon tracks growth through permits, tourism numbers, investment and construction. It rarely tracks how much change a neighbourhood can absorb before it stops feeling like itself.
the solution
The 10% City gives every Lisbon neighbourhood a social carrying capacity. When more than 10% of its social fabric changes within a year, the area goes into pressure mode. The threshold is a signal, not a formula: the moment the city pauses and admits change is outpacing daily life.
It works at neighbourhood level, alongside the existing planning system. No new authority, no heavy regulation. Just a shared agreement that the pace of change is worth measuring.
how it works in practice
Each bairro gets a handful of indicators that reflect lived reality: the share of households that moved in or out, ground-floor shops that changed hands, homes turned into short-term lets, rents against local wages. The numbers are published every year.
When Mouraria crosses 10%, it shows up as an area under social stress. Residents are brought into the conversation, local impact is reviewed, and new pressure – another hotel, another block of short lets – is slowed rather than approved by default. Change carries on, at a pace people can stay part of.
for residents
A shared language for something they already feel and rarely see in policy: the moment their bairro starts slipping out of step with daily life. Change becomes visible and open to discussion, with a legitimate way to say it’s going too fast.
for business
Businesses and investors see a neighbourhood’s social capacity alongside its financial potential. Knowing where pressure mode is near means fewer surprises, less backlash, and development that lasts because it fits the people already there.
for government
Lisbon gets the instrument it’s missing: a social speedometer. It picks up when transformation is outpacing adaptation, while the pressure is still reversible and before displacement and resentment set in. Planning shifts from repairing damage to managing pace.
about this concept
The 10% City is a concept from the Quality of Life Tour in Lisbon. It’s a design proposal, written for Lisbon’s urban labs, civic innovation teams and community-led planning initiatives.
Want one worked up for you? That’s what I do.
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