Gross rental yield is annual rent divided by property value. Net yield is what you actually keep after costs — and it is usually two to three percentage points lower. Most yield figures quoted in the property press are gross, which is why they look better than your bank statement.
Guildford’s average private rent reached £1,728 a month in May 2026, up 6.1% on the year, against a South East average of £1,418 (ONS). Guildford is a high-rent, high-capital-value market — which means strong rental income but yields that look modest next to cheaper parts of the country.
Working out gross yield
Annual rent ÷ property value × 100. A property worth £450,000 letting at £1,728 a month produces £20,736 a year, which is a gross yield of about 4.6%.
That number is useful only for comparing properties against each other. It tells you nothing about whether the investment works, because it ignores every cost you will incur.
Working out net yield — the number that matters
Take the annual rent and subtract everything, then divide by what the property actually cost you including purchase costs. The costs landlords most often leave out:
Voids. If a property is empty for three weeks between tenancies, that is roughly 6% of your annual rent gone. In Guildford at £1,728 a month, three weeks costs about £1,200. Void periods are the most underestimated cost in lettings.
Management. Fully managed in Guildford runs around 10–15% plus VAT. Ours is 12% inclusive. What should and should not be inside that figure.
Maintenance. A common planning assumption is 1% of property value a year, though period property runs higher and new-build lower. On a £450,000 house that is £4,500 — considerably more than most first-time landlords budget.
Compliance. Gas safety annually, EICR every five years, EPC every ten, plus alarms. A few hundred a year averaged out, and non-negotiable.
Insurance, ground rent and service charges. Service charges on a flat can be the difference between a working investment and a poor one.
Tax. And rising — property income moves to its own rates from April 2027.
Run those against £20,736 of rent and a 4.6% gross yield frequently becomes something closer to 2.5–3% net before finance costs. That is not an argument against letting in Guildford. It is an argument for knowing your real number.
Why Guildford yields look low — and why that is not the whole story
High capital values suppress yield arithmetic. A £120,000 flat in a low-value area letting at £700 a month shows a gross yield above 7%. On paper it beats Guildford comfortably.
What that comparison misses is everything yield does not capture: void risk, arrears risk, tenant demand depth, maintenance profile, and capital growth. Guildford has a deep and durable tenant base — the university, the Royal Surrey, the research park, and a commuter market with direct trains to Waterloo. Properties let quickly, arrears are comparatively low, and demand does not evaporate when the economy turns.
A 3% net yield with reliable occupancy and steady capital growth can outperform a 7% gross yield in a market with thin demand and long voids. Yield is one input, not the answer.
What moves your yield most
Occupancy, before anything else. Every week empty is a week of pure loss against fixed costs. Tenant retention is worth more than a rent increase — which is a real argument for family areas where tenancies run long over higher-churn town centre flats, even at a slightly lower rent.
Getting the rent right at the start. Since rent can only rise once a year and the tenant can challenge it at tribunal, undervaluing at the outset is a mistake you carry for twelve months. Working out the right figure.
Not overspending on the wrong improvements. A new kitchen may add £75 a month. A £15,000 solid wall insulation job will add nothing to the rent, though it will be necessary for EPC C by 2030. Know which category each spend falls into before you commit.
Rent figures: ONS Price Index of Private Rents, May 2026. Yield examples are illustrative — not investment advice.
General information, not legal advice. Rent figures are borough-level ONS data; individual streets vary considerably. Property Lounge, Guildford.
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