Using a mortgage as leverage: build a bigger UK portfolio with less cash

The idea in one sentence

Instead of using all your cash to buy one property outright, you use it as deposits on several properties with a mortgage on each — so your money benefits from the growth of the whole portfolio, not just one home.

A worked example: £200,000 of cash

Each apartment costs £200,000 and rents for £14,000 a year (a 7% gross yield, in line with Liverpool and parts of Manchester). Running costs take 30% of the rent, leaving £9,800. The mortgage is interest-only at 5.5%. We assume prices rise 20% over five years — below Savills’ forecast of about 25% for the North West to 2030. Figures are before tax and ignore buying costs, which rise with the value you buy.

• One apartment, bought outright: income of £9,800 a year (£49,000 over five years) plus £40,000 growth = £89,000, a 45% return on your cash.
• Two apartments with 40% deposits (£160,000, with £40,000 kept for buying costs and a reserve): loans of £120,000 each cost £6,600 a year, so income is £6,400 a year (£32,000 over five years) plus £80,000 growth = £112,000, a 56% return.
• Three apartments with 25% deposits (£150,000): loans of £150,000 each cost £8,250 a year, so income is just £4,650 a year (£23,250 over five years) plus £120,000 growth = £143,250, a 72% return — but with a thin margin for higher rates or an empty month.

Why it works — and when it doesn’t

Leverage magnifies whatever the market does. In the example, a 10% fall in prices costs the cash buyer £20,000, the two-property investor £40,000 and the three-property investor £60,000 — almost a third of their cash. It works best when you hold for the long term and never have to sell in a downturn.

Rates matter too. Even at 5.5%, the mortgage on a low-yield property can cost more than its rent brings in after running costs. That is why leverage suits higher-yield cities in the North and Midlands, and why a 60% loan is more resilient today than a 75% one.

How GCC investors can borrow in the UK

UK lenders do lend to buy-to-let investors living in the Gulf, through specialist expat and international lenders. Lenders mainly assess the rent rather than your salary.

• Deposits typically start at 25%, and 35–40% is common for buyers without UK ties.
• The rent must usually cover 125–145% of the mortgage interest, tested at a higher stress rate, which can cap how much you borrow.
• Fixing the rate for two or five years protects your income from rate rises.
• Sharia-compliant home purchase plans work on similar principles — see our guide to Islamic finance.
• A company structure lets you deduct mortgage interest in full, which matters for larger portfolios — see our April 2027 tax guide.

Rules for leverage that lasts

• Borrow at a level the rent comfortably covers, even if rates rise by 1–2%.
• Keep at least six months of mortgage payments and costs in reserve.
• Choose locations with strong tenant demand to keep empty months to a minimum.
• Spread across cities and building types rather than concentrating in one development.
• Plan the exit or refinance from day one, and review the portfolio every year.

How BPG helps

We model each purchase with realistic rents, costs and rates, arrange finance through FCA-authorised partner brokers, and build portfolios across our four cities — so leverage adds growth without adding stress.