Key figures — as of 2026-09-05: In Cascais, 81.3% of property sales go to international buyers, versus 27% in Porto (Portuguese buyers hold 73% of that market) — a gap of 54.3 percentage points, according to Engel & Völkers' Market Report Portugal 2025–2026 — while foreign buyers made up 28% of all home purchases nationally in 2025 (Bank of Portugal).
Two cities, two different markets
If you're househunting in Portugal and assuming the whole country behaves like a single market, the new brokerage numbers say otherwise. In Cascais, 81.3% of property sales were made to international buyers, with Brazilian, Russian and American buyers most prominently represented in the data. Head 300km north to Porto and the picture flips almost entirely: Portuguese buyers account for 73% of the Porto market, with international buyers at 27%, led by Americans, followed by French and Spanish buyers.
That's not a small regional quirk — it's one of the widest domestic-versus-foreign splits anywhere in the country's residential market. For context, foreigners accounted for 28% of home purchases in Portugal last year, according to Bank of Portugal data released in May 2026, with Brazil, Angola and France the leading countries of origin. Cascais runs nearly three times above that national average; Porto sits almost exactly on it.
Why the gap exists
Cascais has spent two decades building the infrastructure of an international enclave — international schools, English-speaking service providers, a lifestyle draw within commuting distance of Lisbon — and the buyer data simply confirms what estate agents on the ground already describe. Engel & Völkers describes Cascais and nearby Estoril as sought-after locations for higher-income domestic and international families, with a housing supply of sea-view apartments and villas in gated communities.
Porto tells a different story. It's a working city with a large resident population and a housing stock still absorbed mostly by locals, even as foreign interest grows in absolute terms. Separate research using a different methodology — tracking online listing views rather than completed sales — found non-residents representing 12% of online demand in Porto, mid-table among Portugal's 20 largest cities, reinforcing that whichever way you slice the data, Porto simply isn't behaving like a foreign-buyer hotspot the way Cascais or the Algarve resort belt do.
The Algarve backs up the pattern at the other end of the spectrum. In the Algarve's central resort market, about 80% of buyers in Quinta do Lago and Vale do Lobo are international, and Vilamoura reports a similar pattern with 75% of buyers international, led by Germans, Dutch and Belgians. Cascais, in other words, behaves like a resort market embedded inside the Lisbon metro area — not like a typical Portuguese city.
GrowIN's read on the numbers
Do the maths on that 54.3-point gap and the practical implication for foreign buyers is straightforward: in Cascais you're competing in a market where roughly four out of every five closed sales already go to someone from abroad, meaning pricing, agent networks and even viewing schedules are built around international clients as the default. In Porto, you're the exception rather than the rule — nearly three-quarters of the competition for any given listing is Portuguese, which typically means less English-language handling by sellers, faster-moving local cash offers, and a market where foreign buyers who move deliberately and locally-advised can still find genuine value that hasn't been priced up for an international audience.
"Cascais now behaves less like a Portuguese suburb and more like a resort market with a Lisbon postcode," says GrowIN Portugal Editorial.
What this means in practice
None of this changes the mechanics of buying: you still need a NIF, a Portuguese bank account, and to budget for IMT, stamp duty and notary costs before the escritura. Owning property in Cascais or Porto also confers no residency rights on its own — the Golden Visa's real-estate route is gone, and anyone planning to relocate still needs a route like the D7 or D8 through AIMA. See our visas hub for the current options.
What the split does change is expectation-setting. A buyer walking into Cascais assuming they'll get a lower-competition, "undiscovered" deal is working against 81.3% of the market. A buyer assuming Porto is now flooded with foreign money, the way some headlines about Portugal's property boom suggest, is working against data showing it's still overwhelmingly a Portuguese city's housing market.
What to watch next
Watch whether Porto's foreign share moves as digital nomads and remote workers continue drifting north for lower costs, and whether Cascais's international concentration starts pushing local buyers out entirely — a dynamic already visible in parts of the Algarve. Confirm current IMT and stamp duty rates with Portal das Finanças before budgeting a purchase, and get municipality-specific advice before assuming either city's pattern applies to a specific neighbourhood.
Foreign buyers weighing Cascais against Porto are, in effect, choosing between two different countries wearing the same passport stamp.