Should I Buy This Property as an Investment? Check These Risks First

Should you buy this property as an investment? Only if the numbers make sense, the risks are manageable, and there is a realistic demand for the property. Before committing your money, check its rental income potential, vacancy risk, future resale value, location, market demand, development opportunities, and how easily you can sell it when you need to exit. A property may look attractive in photographs but still become a poor investment if maintenance costs are high, tenants are difficult to find, ownership documents are questionable, or the asking price exceeds its actual market value.

A client sent me a property listing at 11 p.m. last week with one line: “Should I buy this?” No financial figures. No background information. Just a screenshot and a question that could not be answered responsibly from an image alone.

The problem is that buying property for investment involves more than liking the building or believing prices will rise. You need to establish how much income it can generate, how long it might remain vacant, whether the neighbourhood has genuine growth potential, and whether future buyers will want the property. You must also investigate title documents, planning approvals, access roads, drainage, structural condition, and any restrictions that could affect your investment.

In this guide, I will examine seven essential investment questions using practical calculations and realistic examples. You will learn how to estimate rental returns, assess vacancy losses, evaluate appreciation potential, examine location advantages, measure demand, identify additional development opportunities, and determine resale prospects.

The goal is simple: help you decide whether a property deserves your money before you commit. Rather than relying on assumptions or sales promises, you will have a practical framework for comparing properties, identifying warning signs, and making a more informed investment decision.

The One Mistake That Breaks Every Other Calculation

Before the formulas, one warning, because it undoes everything else if you skip it: never evaluate a property’s investment potential using the asking price. Use the price you expect to actually close at, after negotiation, after any immediate repair costs, and after transaction fees (legal fees, agency commission, stamp duty or its local equivalent, and in Nigeria specifically, governor’s consent or C of O processing where applicable). A property that looks like a 7% yield at asking price can quietly become a 5.2% yield once you’ve added 12% in acquisition costs on top of the purchase price. Every formula below uses “total acquisition cost,” not “listing price” keep that distinction in your head for everything that follows.

With that settled, let’s take the seven questions one at a time.

1. Rental Income: What Will This Property Actually Pay You?

Rental income is usually the first number people chase, and usually the first number people calculate wrong because they calculate gross yield and quietly forget that gross yield isn’t what lands in your pocket.

Gross Rental Yield tells you the raw earning rate before expenses:

Gross Rental Yield (%) = (Annual Rental Income ÷ Total Acquisition Cost) × 100

Net Rental Yield is the number that actually matters, because it subtracts what the property costs to run:

Net Rental Yield (%) = [(Annual Rental Income − Annual Operating Expenses) ÷ Total Acquisition Cost] × 100

Annual Operating Expenses should include property tax or tenement rate, insurance, maintenance reserve (a realistic figure is 1–2% of property value per year), agency/management fees if you’re not self-managing, and an allowance for vacancy (covered in the next section).

Here’s a worked example using a small residential property, with figures you can substitute for your own currency and market:

Item	Amount
Total acquisition cost	₦45,000,000
Annual rental income	₦4,200,000
Annual operating expenses	₦950,000
Gross rental yield	9.3%
Net rental yield	7.2%

Notice the gap between 9.3% and 7.2% that gap is exactly what most “should I invest” content leaves out, and it’s the difference between a property that genuinely cash-flows and one that only looks like it does on the listing page.

If a seller or agent only ever quotes you gross yield, ask directly for the net figure, or calculate it yourself from the rental and expense numbers above. Gross yield is a marketing number; net yield is an investment number.

This naturally leads to the next question, because rental income you can’t actually collect every month isn’t rental income at all it’s vacancy risk.

2. Vacancy: The Cost of an Empty Unit

And Vacancy is the quiet killer of rental returns, because people budget as if a property rents every single day of the year, and almost none do.

Vacancy Rate (%) = (Vacant Unit-Days ÷ Total Available Unit-Days) × 100

Economic Vacancy Loss = Potential Gross Annual Income × Vacancy Rate

If a property could theoretically earn ₦4,200,000 a year fully occupied, but realistically sits empty for one month during tenant turnover, that’s roughly an 8.3% vacancy rate, and an economic loss of about ₦350,000 a year money that needs to come out of your net yield calculation above, not sit as a surprise you discover in year two.

Vacancy risk isn’t random it’s driven by location and property type, which is exactly why question three matters as much as it does.

3. Location: Scoring It Instead of Just “Liking” It

“Location, location, location” is true and also useless as advice, because it doesn’t tell you how to actually score a location against another one. Here’s a practical scorecard I use with clients, rating each factor 1 (poor) to 5 (excellent):

Location Factor	Score (1–5)
Road access and condition
Proximity to schools, markets, hospitals
Security situation in the immediate area
Drainage and flood history of the specific street
Power supply reliability
Proximity to employment hubs or transit routes
Direction of neighbourhood development (improving vs. declining)

Add the scores. Anything below 21 out of 35 should make you pause regardless of how attractive the price is, because a cheap property in a declining or flood-prone location is rarely cheap once you account for the vacancy and resale problems that location creates which is precisely why this scorecard feeds directly into both the vacancy question above and the resale question coming later.

Before You Buy: Drainage and flood history deserve more weight than most buyers give them, especially across Nigerian urban areas. Ask long-standing neighbours not the agent whether the street has flooded in the last five years. This single question has saved several of my clients from a very expensive mistake.

4. Demand: Is Anyone Actually Looking for What You’re Buying?

Demand is different from location you can have a great location with weak demand for the specific property type you’re buying. A well-located property with four bedrooms in an area where the dominant renter demographic is young singles and couples looking for one- and two-bedroom units will underperform, regardless of how good the street is.

Practical ways to check real demand before you commit:

Search active rental listings in the immediate area and count how many comparable units are sitting unlet for more than 60 days a high count signals oversupply, not opportunity

Ask two or three independent local agents (not just the seller’s agent) how quickly similar units typically rent, and compare their answers

Check whether the area’s dominant demand is short-let, long-let, or owner-occupier a property designed for one of these rented out as another will consistently underperform

This question matters more than most buyers realize, because demand and development potential are directly linked and that link is where this article is going to go somewhere no other “should I buy this property” guide goes.

5. Development Potential: The Layer Almost Every Investment Article Ignores

Here is where most generic investment content stops short, and where this question actually gets interesting if you’re the kind of buyer who thinks in terms of what a plot can become, not just what’s currently built on it.

Development potential is governed by two numbers that most buyers never ask for: plot coverage ratio and floor area ratio (FAR).

Plot Coverage Ratio (%) = (Building Footprint Area ÷ Total Plot Area) × 100

Floor Area Ratio (FAR) = Total Floor Area of All Storeys ÷ Total Plot Area

These two numbers, set by your local planning authority’s zoning for that specific plot, determine whether you can legally add a storey, build a self-contained boys’ quarters, subdivide into a smaller rentable unit, or convert a single-family layout into a multi-unit one. A property on a 450 sqm plot with an existing single-storey building using only 30% plot coverage and an unused FAR allowance often has significantly more investment upside than a property already built out to its maximum legal footprint even if the second one looks more “finished” and costs more today.

This is exactly where my own work connects directly to this question, because it’s the layer I think about professionally every day: designing and evaluating buildings for small and constrained plots. A property’s investment ceiling is frequently set not by the market, but by the plot’s legal development capacity and that number is almost never mentioned in a listing, an agent’s pitch, or, frankly, in most articles answering “should I buy this property.” Before you buy specifically for development upside, confirm the plot’s zoning classification, permitted density, and remaining FAR headroom with the local planning authority directly not from the seller’s word.

If a property’s main attraction is “you can build more on it later,” get that confirmed in writing from the planning authority before you buy, not after. I have seen buyers purchase specifically for expansion potential that turned out to be legally unavailable under current zoning.

6. Appreciation: What the Property Will Be Worth Later

Appreciation is the number people are most excited about and least able to calculate honestly, because it requires projecting the future from the past which is inherently uncertain, but still far better done with a formula than a feeling.

Compound Annual Growth Rate (CAGR) = [(Ending Value ÷ Beginning Value)^(1 ÷ n)] − 1

where n is the number of years held.

If a comparable property in the same immediate area sold for ₦28,000,000 five years ago and a similar one just sold for ₦45,000,000 today, the CAGR is:

(45,000,000 ÷ 28,000,000)^(1/5) − 1 = (1.607)^(0.2) − 1 ≈ 9.9% per year

That 9.9% is historical, not guaranteed but it’s a far more honest starting point for a projection than an agent telling you “this area is appreciating fast” with no comparable sales to back it up. Always ask for at least two to three genuinely comparable sales (similar size, condition, and street) before trusting any appreciation claim, because appreciation and demand are directly connected: an area with weak rental demand rarely sustains strong price appreciation for long, however attractive the short-term trend looks.

7. Resale Potential: Will Anyone Actually Want to Buy This From You?

Resale potential is the question almost nobody asks until they’re the one trying to sell, and by then it’s too late to change the property’s fundamentals. Three practical measures:

Days on Market (DOM) for comparable properties in the immediate area ask local agents directly rather than relying on an online estimate. A healthy, liquid market typically shows comparable properties selling within 60–120 days; anything consistently beyond that signals a resale problem baked into the location or property type, not just pricing.

Price-to-Rent Ratio, which also doubles as a rough resale health check:

Price-to-Rent Ratio = Property Price ÷ Annual Rental Income

A ratio under 15 generally favours buying (rental income justifies the price, which supports resale demand from future investor buyers). A ratio above 20 often signals a market priced for appreciation speculation rather than income fundamentals, which can make resale harder if sentiment shifts.

Buyer Pool Width count how many realistic buyer types exist for this exact property (owner-occupier families, young professionals, investors, diaspora buyers). A property that only appeals to one narrow buyer type will always be harder to resell quickly than one with broad appeal, regardless of how good the numbers look on paper.

This is where everything comes back full circle: a property with strong location, real demand, and legal development headroom (question five) will almost always have a wider resale buyer pool than one without which is exactly why these seven questions were never really separate questions in the first place. They’re one connected system.

Pulling It Together: The Investment Readiness Score

Rather than leaving you with seven separate answers, here’s how to combine them into one number you can actually compare across properties. Score each factor 1–10, apply the suggested weight, and sum the weighted scores.

Factor	Weight	Weighted Score
Net rental income/yield	20%
Vacancy risk (lower risk = higher score)	15%
Location	20%
Demand	15%
Development potential	15%
Appreciation outlook	10%
Resale potential	5%
Total	100%	/10

A total weighted score above 7.5 generally indicates a genuinely strong investment candidate. Between 5.5 and 7.5, the property may still work but likely needs negotiation on price or a specific risk (vacancy, location, resale) actively managed. Below 5.5, the honest answer is usually no regardless of how emotionally attached you’ve become to the listing photos.

A Global Layer: How This Framework Travels

Because MassodihPlans reaches readers well beyond Nigeria, it’s worth being direct about how these seven factors shift by market, so you’re applying the framework correctly wherever you’re buying.

In the United States, Canada, and Australia, rental yield expectations are typically lower (often 4–6% gross in desirable metro areas) because appreciation and tax treatment (depreciation benefits, 1031 exchanges in the US, negative gearing in Australia) carry more of the investment case than raw cash flow.

And in the UK and Germany, strict tenancy protections extend average vacancy-to-re-let timelines and affect how aggressively you can reprice between tenants factor this directly into your vacancy rate assumption rather than using a Nigerian or US turnover benchmark.

In the UAE, Qatar, and Singapore, off-plan purchases carry development-stage risk that doesn’t appear in any of the seven questions above in the same way always add developer track record and project completion history as an eighth factor in these markets specifically.

Also in Switzerland and Luxembourg, extremely low vacancy and high price-to-rent ratios are market norms, not red flags the resale and appreciation calculus there leans on long-term capital preservation rather than income yield, so don’t apply a 15x price-to-rent benchmark built for a higher-yield market.

In Iceland, tourism-driven short-let demand can distort both rental income and vacancy calculations seasonally always calculate yield on a full 12-month cycle, never an extrapolated peak-season month.

Wherever you’re buying, the seven questions and the formulas behind them stay identical. What changes is the benchmark you compare your numbers against and that benchmark is always local, never universal.

How This Connects Back to Small-Plot Building Decisions

If you’re reading this specifically because you’re weighing buying an existing property against building on a small plot which is the exact decision many of my Nigerian and diaspora clients are working through the development potential section above is where the real answer usually lives. A small plot (typically 300–450 sqm in many urban Nigerian layouts) with a well-designed building plan can often out-earn a larger, less efficiently planned property, because rental income scales with usable, well-zoned floor area and design efficiency, not raw plot size.

This is the exact gap between buying a finished property as-is and commissioning a building plan designed from the start for rental performance self-contained unit separation, shared-service efficiency, and setback-compliant massing that maximizes legal floor area rather than wasting it. If your “should I buy this” question is really “should I buy land and build instead,” that comparison deserves its own full calculation, and it’s one worth having a qualified architect and town planner walk through with you before you commit either way.

Frequently Asked Questions

What rental yield is considered good for an investment property?

This depends heavily on market and property type, but as a general cross-market benchmark, a net yield above 6-7% is strong in most residential markets, while 4-5% net is common in low-yield, high-appreciation markets like parts of the US, UK, and Western Europe.

How do I calculate if a property’s price is too high for its rental income?

Use the Price-to-Rent Ratio (Property Price ÷ Annual Rental Income). A ratio consistently above 20 in a market where comparable properties rent for less relative to price suggests the asking price is being driven by speculation rather than income fundamentals.

Should I prioritize appreciation or rental income?

Neither universally it depends on your holding period and financing structure. Shorter holding periods and leveraged purchases generally need stronger cash flow (rental income) to service financing comfortably; longer holding periods with lower leverage can tolerate lower initial yield in exchange for stronger appreciation potential.

How much weight should location really carry in the decision?

Significant weight, because location drives three of the other six factors (vacancy, demand, and resale potential) indirectly. A location scorecard below roughly 60% of maximum should be treated as a serious caution flag even when the financial numbers look attractive.

Is development potential relevant if I just want rental income, not a flip?

Yes, unused floor area ratio and plot coverage headroom let you add rentable units later (a self-contained unit, a boys’ quarters conversion) without buying additional land, which directly improves long-term rental income from the same acquisition cost.

Finally,

“Should I buy this property as an investment” was never a single yes-or-no question it’s seven calculations that all feed into each other, and the property that wins isn’t the one with the best story from the agent, it’s the one where the numbers hold up when you actually run them. Pull out the formulas above, run your specific property through each one, and let the weighted score not the listing photos make the final call.

If your real question underneath this one is whether to buy an existing property or build on a small plot instead, our Services page covers how we work through that comparison with clients directly. Browse our Plans Library for building plans designed with rental and resale performance in mind on constrained plot sizes, or visit Plan School to understand how floor area ratio and plot coverage actually work before you commit to either path. You can also explore more investment and building guides on our Homepage.

Author

Massodih Okon is a Nigerian built-environment professional with academic and professional experience in urban and regional planning, geography, architectural design, Landscape Design, GIS and land development.

He holds a Master’s degree in Urban and Regional Planning from the University of Uyo and a first degree in Geography and Regional Planning.

Through MassodihPlans, he publishes practical guides on Nigerian house plans, building design, physical planning, site planning, development approval and residential construction. Read the full author profile →