How to evaluate an investment property
✦ Key Takeaways
- An investment property isn't judged by price or rent alone.
- Start by ruling out deal-breakers, before you run a single number.
- Then work out gross and net yield — the gap between them is the true cost of ownership.
- Finally, weigh vacancy risk, tenant demand, due diligence and your exit strategy.
You've found a property — a flat to let, an office, a leased commercial unit, a warehouse. The question that's left is whether it's actually worth buying, and evaluating an investment property isn't something you settle with a single calculation. It takes a sequence: first work out whether the property is even worth a closer look, then calculate its real return, and finally score it as a whole.
This guide follows that exact sequence, from first glance to final decision, and covers every category of income property.
What actually makes a property a good investment
A property creates value as an investment through three mechanisms: the income it generates, the capital appreciation it builds up over time, and its ability to be sold when you need to exit. It's rare for a property to be strong on all three at once — one with excellent rental yield might be hard to resell, another with great liquidity might perform only modestly. That's why evaluation never stops at a single number.
Here's something that trips up even experienced buyers: yield is rent divided by purchase price. Price and rent rising together doesn't necessarily mean a higher yield. You always compare a property against the income it produces and against comparable properties on the market. What we check first on any income property is whether the numbers hold up against the market.
When to walk away before you run any numbers
Before you get into yield calculations, it's worth checking for a few things that can completely change the picture of a deal. Some of these can be worked around; others add enough cost, risk or delay that the property stops making sense:
- Weak or declining rental demand in the specific area or property category. No yield on paper offsets a shrinking market.
- A yield that only looks good because of an unrealistic rent. This happens when the advertised yield is based on rent well above current market levels. If the existing tenant leaves, the numbers need to be reworked using what the property can actually achieve at that point in time.
- A weak exit scenario — where the property's quirks, or a thin market for it, would make a future resale genuinely difficult.
- Renovation costs that don't add up — if the required investment can't be recovered through higher rent or higher value down the line. There's often room to negotiate the price here.
- Complicated legal or technical issues — disputed title, liens, pending claims, or unauthorised construction that would take a long, costly or uncertain process to resolve.
If one or more of these apply, it's worth taking a hard look at whether the deal still makes sense before you move on to the financial analysis.
Location and rental demand: what actually matters
Location pulls the evaluation in two directions at once. A prime location lowers the risk of the property sitting empty and supports capital appreciation, but it usually compresses current yield, since the purchase price is already high relative to rent. There's just a different mix of yield and risk, and figuring out which mix fits your goal is the real question.
Rental demand is best checked with hard data rather than a gut feeling: how quickly comparable listings in the area get taken, who the likely tenants are, and how the local market has moved over the past year or two. Vacancy — the stretch of time a property sits empty between tenancies — is one of the most commonly overlooked factors, because it only shows up in the real numbers after you've bought.
Energy rating: why it matters more every year
Energy performance is no longer a minor detail. It shapes tenant demand, since both individuals and a growing number of businesses now weight sustainability and environmental footprint in their decisions. It also shapes running costs directly: a poor energy rating means higher heating and cooling bills, which either makes the property less attractive to tenants or gets passed through as lower rent.
On commercial property, a "green transition" investment plan can also unlock lower-cost borrowing through Greece's Recovery and Resilience Facility — availability and terms vary over time, so always confirm the current position with a bank before relying on it. This applies to specific business investment plans that meet the eligibility criteria, unlike residential "green mortgages," which offer an automatic rate discount.
How to calculate return on investment (ROI) on a property
Gross rental yield
The quick first filter:
Gross yield (%) = (Annual rent ÷ Purchase price) × 100
It's useful for comparing several properties fast, but it says nothing about what actually ends up in your pocket. On commercial property in particular, yield without checking the tenant is only half the picture — the example below makes that clear.
The real costs that fall on the owner
Gross yield ignores a set of costs that, added together, can meaningfully cut into actual profitability:
| Expense category | What it covers |
|---|---|
| ENFIA | Annual Greek property tax |
| Building insurance | Cover against fire, earthquake, etc. |
| Management | Property manager or agent fee, if used |
| Maintenance reserve | Annual provision for repairs and wear |
| Vacancy allowance | Estimated income loss between tenancies |
Rental income tax isn't included here, because it's calculated separately on the net operating income, based on the owner's overall tax bracket — not at the level of the property itself. It affects your final, personal return, not the NOI.
Maintenance provisions, in particular, aren't the same across property types. On a shop or commercial unit, a new tenant often fits out the space to their own business needs, which can mean extra work before the next tenancy begins. On offices, the owner more often carries upgrades to the building shell, common areas, or heating and cooling systems, to keep the property competitive. On residential property, renovations and replacing worn fixtures almost always fall to the owner. Budgeting for future maintenance isn't a footnote — it's a core part of the evaluation.
Net operating income (NOI) = Annual rent − Operating expenses
Net yield and cash flow
Net yield (%) = (NOI ÷ Total acquisition cost) × 100
"Total acquisition cost" includes the purchase price and the transfer costs (transfer tax, notary, agency fee). If you're financing with a loan:
Cash flow = NOI − Annual loan repayments
💡 Tip: Always compare two properties on net yield too, never on gross yield alone. The property with the lower gross yield can end up with the higher net yield, if its running costs are lower.
If you're financing a large share of the purchase with debt, there's a third metric: return on the equity you actually put in. It matters mainly when leverage is significant; it needs its own set of financing assumptions.
Cap rate is also widely used in professional real estate investment — it compares net operating income to the property's value. We'll cover it in a separate guide.
Worked example: apartment, office, commercial unit, warehouse
Indicative yields differ considerably by property category:
| Category | Indicative prime yield (Athens, 2025) |
|---|---|
| Apartment (residential) | Varies significantly by area |
| Office | 5.65% – 5.80% |
| Leased commercial unit (high street) | 5.50% – 6.00% |
| Warehouse / Logistics | 6.80% |
Worked example: leased commercial unit, €650,000
The figures below are purely illustrative, to show the method.
The property is leased at €3,500/month (€42,000/year), priced at €650,000.
Gross yield: 42,000 ÷ 650,000 × 100 = 6.5%
Acquisition costs:
| Cost | Amount |
|---|---|
| Transfer tax (3.09%) | €20,085 |
| Notary fee (incl. VAT) | €5,623 |
| Legal fee (incl. VAT) | €4,303 |
| Agency fee (2% + VAT) | €16,120 |
| Land registry fee (0.5%) | €3,250 |
| Total acquisition costs | €49,381 |
Total cost of acquisition = 650,000 + 49,381 ≈ €699,400
Annual operating expenses:
| Item | Amount (indicative) |
|---|---|
| ENFIA | €2,200 |
| Insurance | €450 |
| Maintenance reserve | €600 |
| Vacancy allowance (~4%) | €1,680 |
| Total | €4,930 |
NOI = 42,000 − 4,930 = €37,070
Net yield = 37,070 ÷ 699,400 × 100 = 5.3%
The gap between 6.5% gross and 5.3% net is the real cost of ownership.
Capital appreciation and exit strategy
Capital appreciation is the second pillar of return, alongside rent. It's driven mainly by how the area develops, by the condition and energy upgrades of the property itself, and by the broader market trend. Your exit strategy is decided on the day you buy: a property with an unconventional use, or one in a thin market, can generate excellent rental yield yet prove hard to resell when the time comes.
Appreciation doesn't work the same way across property types. On a home, it's driven mostly by how the neighbourhood evolves. On a commercial property, it depends more on demand from the specific sector it serves: an office in an area attracting tech companies, or a shop on a street that's gaining commercial traction, can see real value growth independent of the wider market. Appreciation is the hardest variable to predict accurately, and a conservative estimate protects your analysis better than an optimistic one.
What to check in legal and technical due diligence
Legal due diligence is carried out by a lawyer and confirms clean title, with no liens or third-party claims. Technical and planning due diligence is carried out by an engineer and confirms compliance with the building permit. See our detailed guides to property transfer documents and buyer costs.
Lease term and quality
If the property is sold already leased, the remaining lease term and the tenant's creditworthiness matter just as much as the yield itself. In professional real estate, this is tracked systematically through WALT (weighted average lease term).
Every investment carries its own risk. What you can have is a structured process for evaluating that risk. The scorecard below is the tool we use to compare different investment opportunities against common criteria.
The Terra Property Investment Scorecard
| Criterion | Weight | Score (0–10) | Weighted score |
|---|---|---|---|
| Location | 25% | ||
| Yield | 20% | ||
| Tenancy risk | 15% | ||
| Due diligence | 15% | ||
| Hidden costs | 10% | ||
| Exit strategy | 10% | ||
| Energy rating | 5% | ||
| Total | 100% |
How to read it: ≥7.5 Strong investment · 5.0–7.4 Needs caution · <5.0 Pass. The scorecard works alongside the deal-breaker checks from the earlier section, never in place of them.
Terra Property's view: Before we recommend any income property to an investor, we run it through the deal-breaker checks first, and only then through this exact scoring system.
Each metric on its own only tells part of the story. Evaluating an investment property properly means combining financial calculations, risk checks and market experience. The more systematically you apply this process, the better your odds of a successful investment. If you'd like to try it on a real property, take a look at Terra Property's current investment properties for sale.