Growing a Property Portfolio: A Worked Example of Sequencing

Buying a second property is a different decision from buying the first. A calculation showing what capacity looks like.

Portfolio growth is often described in terms of ambition, and it is better described in terms of capacity: how much rent covers how much obligation, with what margin, before the next purchase becomes sensible.

The situation

An investor owns one apartment producing rental income and is considering a second purchase. They want to know whether the portfolio supports it and what margin remains if conditions worsen.

Assumptions (illustrative)

• Property one value: SAR 850,000, currently financed with an outstanding balance of SAR 400,000.
• Assumed annual financing cost on property one: SAR 28,000.
• Net rental income from property one after costs: SAR 36,000 per year.
• Proposed property two price: SAR 700,000, with SAR 210,000 available as equity.
• Assumed annual financing cost on property two: SAR 34,000.
• Assumed net rental income from property two: SAR 30,000 per year.
• Personal income available to support obligations: assumed SAR 90,000 per year after living costs.

Step 1: Current position

SAR 36,000 net income less SAR 28,000 financing cost equals SAR 8,000 surplus.

Property one contributes a modest cash surplus. Most of its return is currently in debt reduction and any capital growth, not in cash.

Step 2: Adding property two

SAR 30,000 net income less SAR 34,000 financing cost equals a deficit of SAR 4,000.

The second property does not cover itself at these assumptions, which is common and not automatically wrong, but it must be funded from somewhere.

Step 3: Combined portfolio position

SAR 8,000 surplus less SAR 4,000 deficit equals SAR 4,000 net surplus across both.

The portfolio remains marginally positive in cash terms, with almost no buffer for anything unexpected.

Step 4: Stress test: one vacancy

Three vacant months on property two removes roughly SAR 9,000 of income, turning the SAR 4,000 surplus into a deficit of about SAR 5,000.

A single ordinary vacancy moves the portfolio from positive to negative, funded from personal income.

Step 5: Stress test: a major repair

An SAR 20,000 repair in a year with a vacancy produces a combined shortfall of roughly SAR 25,000 against personal capacity of SAR 90,000.

Survivable in this example, but it consumes a quarter of the annual capacity that was supposed to fund living and future deposits.

Step 6: Capacity conclusion

The portfolio supports the second purchase, with the caveat that personal income is now the buffer rather than the rental surplus.

This is the decision point most investors skip. The question is not whether the purchase is possible but what remains if two ordinary problems occur in the same year.

What changes the answer

• A higher equity contribution reduces the financing cost and moves property two toward self-sufficiency.
• Rising financing costs on a variable arrangement compress the surplus directly.
• Rent growth improves the position gradually, while a soft rental market does the opposite.
• Selling property one to buy a larger asset changes the risk profile entirely and deserves its own analysis.

What the numbers tell you

• Test portfolio capacity against two simultaneous ordinary problems, not against the base case.
• Know whether each property covers itself, and how much personal income is supporting the portfolio.
• Treat equity contribution as a lever for resilience, not only for return.
• Decide in advance what would trigger a sale, since that decision is far harder to make under pressure.

Limits of this example

Every figure above is an illustrative assumption used to show the method, not a quote, valuation or market rate. Costs, rates, fees and regulations change and must be confirmed with the relevant authority, lender or supplier before you commit.

If you are buying, selling or investing, Domira can verify the documents, assess the property and build the numbers with you before you commit to a transaction.