What Is a Good ROI on Rental Property in the UK?

2026-07-10

The Problem with "Good ROI"

Ask five property investors what a "good ROI" is and you'll get five different answers. That's because ROI in property investing isn't a single number — it's a combination of cash-on-cash return, capital appreciation, equity build-up, and tax efficiency. Which components you prioritise depends on your strategy, your timeline, and your tax position.

This guide cuts through the confusion. It defines how to calculate property ROI properly, what returns are genuinely achievable in the UK market in 2026, and how to benchmark your deals against realistic expectations rather than guru promises.

Cash-on-Cash Return: The Number That Matters Most

Cash-on-cash return measures the annual cash flow generated relative to the cash you actually invested. It's the purest measure of how hard your money is working.

Cash-on-cash return = Annual net cash flow ÷ Total cash invested × 100

Total cash invested includes: deposit, stamp duty, legal fees, survey, arrangement fee, broker fee, and any renovation costs. Everything that came out of your bank account.

Annual net cash flow is: total rent received minus every cost (mortgage, management, insurance, maintenance, voids, accounting) over 12 months.

What's Realistic in 2026?

• 0-3% cash-on-cash: Typical for properties in southern England at current interest rates. You're holding for capital growth, not cash flow
• 3-6% cash-on-cash: Good. Achievable in midlands and northern cities with careful purchasing. The property pays for itself and generates a return
• 6-10% cash-on-cash: Very good. Usually requires below-market-value purchasing, value-add renovations, or HMO conversion
• 10%+ cash-on-cash: Excellent but rare with standard BTL. Typically achieved through BRRR with minimal money left in, or high-yielding HMOs

Anyone promising 20%+ cash-on-cash returns on standard BTL deals in 2026 is either miscalculating (forgetting costs) or selling you something.

Capital Growth: The Silent Compounder

Capital growth — the increase in property value over time — is often the largest component of total return, but it's the hardest to predict and the easiest to overestimate.

UK house prices have averaged 3.5-4.5% annual growth over the last 30 years. But averages mask enormous regional variation. London averaged 7%+ for decades, then went flat for five years. Northern cities underperformed for a decade, then outperformed. Individual postcodes within the same city can diverge by 3-5% per year.

For deal analysis, conservative assumptions are essential:

• Conservative: 2% per year — barely above inflation
• Moderate: 3.5% per year — roughly the long-term average
• Optimistic: 5% per year — possible in strong markets but not guaranteed

Never rely on capital growth to make a deal work. If the deal only makes sense with 5%+ annual growth, it's speculation, not investment.

Total Return: Combining Cash Flow and Growth

Total return = Cash-on-cash return + (Annual capital growth ÷ Cash invested × 100)

This is where leverage transforms the numbers. On a £200,000 property with £60,000 cash invested and 3% capital growth:

• Annual capital growth: £6,000
• Capital growth ROI: £6,000 ÷ £60,000 = 10%
• If cash-on-cash return is 2%: total return = 12%

You're earning 12% on your cash when you combine the income and the growth. That's the power of leverage — you own £200,000 of asset but only deployed £60,000 of capital. The growth accrues on the full property value, not just your deposit.

This is also the risk of leverage. If property values drop 3%, your total return is -8% (2% cash flow minus 10% capital decline). Leverage amplifies returns in both directions.

Equity Build-Up (Repayment Mortgages Only)

If you're on a repayment mortgage rather than interest-only, each monthly payment reduces the loan balance. After 10 years on a £150,000 repayment mortgage at 5% over 25 years, you'll have paid down roughly £30,000 of capital. That's £30,000 of forced savings that isn't captured in the cash-on-cash calculation.

Most BTL investors use interest-only to maximise cash flow, so equity build-up doesn't apply. But if you're on repayment, it's a real component of return that you should track.

Benchmarking: What Should You Target?

Here's a realistic benchmarking framework for UK BTL investors in 2026:

• Minimum viable deal: Cash-on-cash ≥ 0%, positive cash flow after all costs. The property doesn't cost you money monthly. Capital growth is the return driver. Suitable for strong capital growth areas (London commuter belt, university cities)
• Solid deal: Cash-on-cash 3-5%. Comfortable cash flow with headroom for rate rises. Total return 10-15% with moderate capital growth. The bread and butter of portfolio building
• Excellent deal: Cash-on-cash 6%+. Strong cash flow even under stress testing. Total return 15%+. Typically requires value-add or below-market purchasing. This is what BRRR and HMO strategies aim for

These targets assume 75% LTV. Cash buyers can target higher cash-on-cash but sacrifice the leverage multiplier on capital growth.

The ROI Calculation Mistakes to Avoid

1. Forgetting Stamp Duty in Cash Invested

The 5% additional property surcharge on a £200,000 purchase is £10,000. Excluding it from your cash invested calculation inflates ROI by 15-20%. It's real money you spent — include it.

2. Using Gross Rent Instead of Net Cash Flow

"My property returns 8%" usually means "I divided the rent by the deposit." That's not ROI — it's a meaningless ratio that ignores every cost. ROI must use net cash flow after all expenses.

3. Counting Capital Growth as Guaranteed

Including 5% annual growth in your "ROI" and presenting it as a certainty is dishonest accounting. Cash-on-cash return is knowable. Capital growth is a bet. Separate them in your analysis.

4. Ignoring Holding Period Costs

Capital growth is only realised when you sell — and selling costs 3-5% of the sale price in agent fees, legal fees, and potentially CGT. A property that grew 15% over 5 years might only net you 10% after disposal costs.

Calculate Your Actual ROI

Don't accept quoted returns from agents, courses, or forums at face value. Calculate your own ROI using your actual costs, your actual mortgage rate, and conservative rental estimates. The number might be less exciting than the headline — but it's the real number, and real numbers are what build real wealth.

Run the full deal analysis, stress test it, and compare the ROI against alternatives. If a deal's cash-on-cash return is 1% and you can get 5% in a savings account risk-free, the deal needs to offer meaningful capital growth potential to justify the risk and effort.

The best ROI is the one you've calculated accurately. Everything else is marketing.