For owners
What's your property really worth today?
Not last year's number. Not the agent's hopeful estimate. Not the bank's conservative one. The number the market actually supports right now — with the features driving it, and the levers that could move it before you list.
Why your mental price tag is probably wrong.
Three market shifts that mean older valuations — and gut estimates — can be significantly off.
Prices vs incomes
+92% vs +43%
The market moved faster than most people realised.
Portuguese property prices rose 92% since 2019. Incomes rose 43%. If you haven't had your property valued recently, the number you have in your head is probably wrong — possibly in your favour, possibly not.
Source: INE · Bank of Portugal · 2019–2025
Bank valuation gap
−8.77%
A bank valuation isn't the market price.
Banks systematically value below market — an average 8.77% gap — and their methodology prioritises lending risk, not current demand. An agent's estimate, by contrast, is often optimistic to win the listing. You need a third reference point.
Source: Bank of Portugal · 2024 lending data
2025 price growth
+17.6%
Record growth, but not evenly distributed.
2025 was the strongest year on record for Portuguese residential prices — but city-by-city, parish-by-parish, the spread is wide. A number that's right for Porto's Foz can be wildly wrong 500 metres away.
Source: idealista price report · Q4 2025
What SirJohn tells you.
A number, an explanation, and a plan for what to do about it.
An independent number, built on your property's real features
SirJohn's valuation model weighs 97 features — location down to the city block, size, bedrooms, energy rating, renovation quality inferred from photos, proximity to centre and coast. The output is an estimate of what the market would pay today, with a confidence tier.
What moves the number, and by how much
Every feature has a measured impact. You'll see whether an extra bathroom, a missing energy certificate, or a renovated kitchen meaningfully changes the estimate — so you know which improvements pay back before you sell.
A check against the agent's pitch
When three agents give you three numbers, you're navigating without a compass. SirJohn's estimate is a neutral reference — the same number the buyer will see on their side, so there are no surprises in the negotiation.
What an answer actually looks like.
A real audit on a Lordelo do Ouro 2-bed apartment. Pricing, risk checks, and the reasoning behind the verdict — live, not a mock-up.
Asking vs Fair Value
-11.0%
Asking Price
320 000 €
Fair Value
360 000 €
3765 € / m²
Asking price sits 11% below the parish median for T2 apartments in Lordelo do Ouro. The property benefits from proximity to the Douro waterfront and Foz do Douro, yet avoids the premium of the riverfront strip. Strong rental demand from university and hospital workers nearby.
- Helps:
Price vs fair value
Priced below what the local market supports — the core reason for the verdict.
-11.0%vs SirJohn fair value - Helps:
Location
Lordelo do Ouro — established, walkable neighbourhood with everyday amenities close by.
Prime parishsupermarket ~3 min - Holds back:
Energy certificate
Lower rating — budget for insulation and expect higher running costs.
Cert C≈ €1,900/yr running cost - Helps:
Risk profile
No material environmental or legal risks flagged for this property.
- Helps:
Rental outlook
Healthy rental yield if you let it out rather than living in it.
5.6% grosslong-let estimate
Price Analysis
Fair value estimate
360 000 €
Asking price
320 000 €
-11.1%below fair valuePrice per m²
3765 €
Parish average
4230 €
How we estimated this
Hedonic regression with 47 comparables (CMA + INE parish median)
Risk Assessment
Guides for owners & sellers.
The factors a serious buyer will investigate — and that quietly move your price. Know where you stand before you list.
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Rules
Alojamento Local (AL) licences
An AL registration can lift your sale price — or quietly fail to transfer to the buyer. Know which before you list on the strength of rental income.
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Risks
Seismic risk
A pre-code build year isn't a dealbreaker, but a buyer's surveyor will raise it. Understand how it reads on your property before it becomes a discount.
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Risks
Coastal erosion
If your property carries a coastal setback, a buyer will find it. Learn how the POOC rules read against your title before it surfaces mid-negotiation.
What this is, and isn't.
A valuation tool that doesn't tell you its limits is less useful than one that does.
- Our estimate has a median error of about 10%. Useful as a reference — not a substitute for a formal valuation when the bank or a court requires one.
- For very atypical properties (unique architecture, unusual sizes, rural land), the confidence tier will be lower. We show that rather than hiding it.
- We're not a brokerage. If you decide to sell, you'll still pick an agent — but you'll pick one with better information.
Enter your property. See the number.
Takes a few minutes. No account required. The more detail you add, the sharper the estimate — we'll show you exactly which fields matter most.