The true cost of buying a home

Buying a home has two kinds of cost: one-off costs you pay at completion, and ongoing costs you pay every month or year. The one-off costs are why buying almost always loses money if you sell within a couple of years — they can easily total £8,000–£15,000 on a £300,000 property before you even move in. Many first-time buyers focus only on saving for a deposit and overlook that Stamp Duty, legal fees and a mortgage arrangement fee can add another 2–5% of the purchase price on top — money you will never get back when you come to sell.

The big one-off items are your deposit (typically 5–15% of the price, though it is not "spent" — it becomes equity), Stamp Duty Land Tax (SDLT), legal fees (conveyancing, usually £800–£1,500), and a mortgage arrangement fee (often £999–£1,999). Surveys and removal costs add more.

Ongoing costs include your mortgage repayment (part interest, part capital), buildings insurance, maintenance (a common rule of thumb is 1% of the property value per year), and service charge or ground rent if the property is leasehold. Council tax and utilities are paid by both renters and buyers, so they cancel out in a comparison.

The true cost of renting

Renting is simpler but has its own costs. You pay a tenancy deposit (capped at five weeks' rent in England and Wales), which is refundable at the end of the tenancy minus any legitimate deductions. Your monthly rent covers the landlord's mortgage, maintenance and profit — but you build no equity.

The big advantage of renting is flexibility and lower upfront cost. The big disadvantage is that your rent can rise at each renewal, and after 25 years you own nothing. Renting also frees up the money you would have used as a deposit — which you could invest, and that potential return is a real cost of buying (see below).

Break-even years explained

The break-even point is the year at which the total cost of buying (including the equity you have built) becomes equal to the total cost of renting over the same period. Before that year, renting is usually cheaper on a cash basis; after it, buying tends to win because your monthly mortgage repayment is increasingly going toward capital rather than interest, and you own an appreciating asset.

Three things move the break-even point: (1) house price growth — faster growth pulls break-even earlier; (2) mortgage rate vs rent growth — high mortgage rates and slow rent rises push break-even later; (3) how long you stay — the longer you stay, the more the one-off buying costs are spread out.

Worked example: £300,000 home vs £1,400/month rent

Take a £300,000 home with a 10% deposit (£30,000), a 25-year mortgage at 5%, and SDLT of £2,500 (5% on the slice above £250,000). Add £1,200 legal fees and a £1,000 arrangement fee. Monthly mortgage repayment is roughly £1,581, maintenance about £250/month, and buildings insurance £25/month — total owned cost around £1,856/month before capital repayment.

Renting an equivalent property at £1,400/month costs £16,800/year. In the early years, renting is cheaper by roughly £400/month — but the buyer is also building equity (about £5,000–£7,000 of capital in year one, rising each year). By year 5–7, the equity built plus the fixed housing cost usually overtakes the cumulative rent saved.

Cost itemBuying (£300k home)Renting (£1,400 pcm)
Upfront (deposit / tenancy deposit)£30,000 (equity)£1,615 (refundable)
SDLT£2,500£0
Legal / arrangement fees£2,200£0
Monthly housing cost~£1,856 (incl. maintenance)£1,400
Equity built (year 1)~£6,000£0
Typical break-even5–8 years

GOV.UK — Stamp Duty Land Tax · 2026/27 rates

The opportunity cost of your deposit

The £30,000 deposit is not free money. If you invested it instead and earned a nominal 5% per year, after 10 years it would grow to roughly £48,900. That foregone return is a real cost of buying — but it is offset by the leverage you get from a mortgage: a 10% deposit controls a £300,000 asset, so even modest house-price growth produces a large percentage return on your deposit. Use our savings calculator to model the alternative.

Frequently asked questions

How long do I need to live in a home for buying to be worth it?
For most UK properties, the break-even point is between 5 and 8 years. If you expect to move within 3–4 years, the one-off costs of buying (SDLT, legal fees, arrangement fees, and the cost of selling) usually mean renting is cheaper.
Is the deposit a cost or an investment?
The deposit is not spent — it becomes equity in your home. But it is tied up and cannot be invested elsewhere, so you should consider the opportunity cost (the return you could have earned). The capital part of your mortgage repayment also builds equity.
Do first-time buyers pay SDLT?
First-time buyers in England and Northern Ireland pay no SDLT on the first £425,000 of a property costing up to £625,000. Above that, standard rates apply. Use our stamp duty calculator for an exact figure.
What if house prices fall?
If prices fall, your equity shrinks and you could be in negative equity if you bought with a small deposit. This is another reason the break-even calculation matters: a longer holding period gives prices more time to recover. Renting avoids this risk entirely.
Should I overpay my mortgage or invest the difference?
It depends on your mortgage rate versus expected investment returns, and your attitude to risk. Overpaying gives a guaranteed return equal to your mortgage interest rate; investing may beat it over the long run but with volatility. See our pay off mortgage or invest guide for a full comparison.

Sources

Educational tools only — not financial advice. House prices, mortgage rates and tax rules can change; always verify against the latest official guidance.