Know what you're buying
before you sign anything.
HomeOS cross-references six official government registries to surface hidden problems with any Portuguese property — in plain English, from anywhere in the world.
Why HomeOS exists
The information was always there.
Nobody made it easy to get.
About 1 in 5 people who buy property in Portugal discover a serious problem after they've already signed. The damp that was behind the fresh paint. The extension built without a permit — which the new buyer now legally owns as their responsibility. The energy certificate that expired in 2014 and was never renewed.
None of this is hidden on purpose, most of the time. It's hidden because the information is scattered across six different government databases, none of which talk to each other. Checking all of them takes weeks, costs hundreds of euros in professional fees, and requires speaking Portuguese and knowing which offices to contact. Most buyers — especially buyers from outside Portugal — simply don't do it. They trust the agent. They trust the listing. They sign.
"In Portugal, when you sign the final purchase deed, you inherit every legal problem that comes with the property — including ones you were never told about. HomeOS was built so you know what those are before you decide."
We built HomeOS to automate all six checks at once — pulling data from the land registry, the tax authority, the energy certification body, municipal planning records, the national statistics institute, and the urban planning database — and presenting it in clear English, with a score that tells you immediately whether there's a problem worth investigating further.
Not because you can't do this yourself. Because it takes three weeks, costs a lot of money, and most of the time the answer comes back after you've already committed emotionally to the property. HomeOS gives you the answer in minutes, before you offer.
How it works
Three steps. No jargon.
Enter the property address
Type any Portuguese property address or paste the listing URL. No account required for free checks.
We check six registries
HomeOS runs your property against the land registry, tax office, energy database, planning records, and two more official sources simultaneously.
You get a plain‑English result
A score and a summary — what was found, what it means, and what questions to ask before you make an offer.
Go deeper if you need to
Get a full written report from €99, or book a physical inspection through InspectOS. We tell you which option fits what we found.
What HomeOS checks
Six registries. One picture.
Each source answers a different question about the property. Together, they tell you what the listing doesn't.
Land Registry
Who actually owns the property, existing mortgages or liens, and whether the legal description matches what is being sold.
Ownership · EncumbrancesTax Authority Records
Official taxable value, whether property taxes have been paid, and the fiscal description that can differ from the listing.
Tax status · Fiscal valueEnergy Certificate
Energy efficiency from A+ to F, whether the certificate is current or expired, and the impact on running costs and resale value.
Energy rating · ValidityMunicipal Planning Records
Whether the property has a valid occupancy licence and if any building work was done without permission.
Licences · Permits · SimplexPrice & Market Data
Comparable sales and the gap between asking price and true market value — what we call the Reality Gap Score.
Reality Gap Score™Urban Planning Zones
Flood, wildfire and other risk zones that can affect insurance, future development or resale value.
Risk zones · Climate exposureClarity on what we are
What HomeOS is — and what it isn't.
Not an estate agent
We earn nothing from whether you buy or don't buy. No referral fees, no developer relationships, no commission. Our only product is information.
Not a law firm
HomeOS reports are property intelligence documents, not legal advice. For contracts or complex transactions, you need a Portuguese property lawyer — and we can refer you to one.
Not a property portal
We don't list properties for sale. We check them. Every agent and developer wants the deal to close. We don't.
Independent intelligence
HomeOS is built on a simple principle: intelligence should protect people, not exploit them. We have no financial stake in whether you buy.
Reports & pricing
Start free. Go deeper when you need to.
Start with our free true-cost calculator — no account, no credit card. Paid reports go further, with written analysis and documentation you can use in negotiations.
True Purchase Cost
Enter your purchase price and see the full acquisition cost — IMT, stamp duty, notary fees, and annual running costs.
- ✓IMT and stamp duty calculated
- ✓Notary and land registry fees
- ✓Annual IMI, condo, and insurance costs
- ✓Resident and non-EU buyer profiles
- ✓Instant results for your price
Essential Report
Full written report with findings, risk scoring, and plain‑English explanations of everything we found.
- ✓All 118 compliance checks
- ✓Written findings, plain English
- ✓Risk score with explanations
- ✓What to ask your lawyer
- ✓Price analysis vs. market
- ✓PDF download, share‑ready
Valuation Report
Everything in the Essential Report plus a full comparable valuation and negotiation brief.
- ✓Everything in Essential
- ✓Comparable sales analysis
- ✓Condition‑adjusted value range
- ✓Negotiation brief included
- ✓Energy upgrade cost estimate
- ✓InspectOS inspection discount
The property you're looking at
deserves five minutes of numbers.
Enter your purchase price and see the full acquisition cost — IMT, stamp duty, notary fees, and annual running costs. Free. No account. No credit card.
Free tool · No sign-up · Results in seconds
HomeOS is not a law firm. HomeOS reports are property intelligence documents and do not constitute legal advice. For CPCV review, legal transaction management, and complex cases, HomeOS recommends working with an independent Portuguese property lawyer. All data is sourced from Portuguese government registries and public data sources.