Buy vs Rent Calculator — How to Compare the True Cost

Why Simple Comparisons Mislead

Ask most people how to decide whether to buy or rent, and they will say: compare your mortgage payment to your rent. It sounds logical. It is also dangerously incomplete. A proper buy-versus-rent comparison needs to account for at least a dozen different cost streams, some of which run for decades and some of which hit you once at the beginning.

Our [buy vs rent calculator](/buy-vs-rent-calculator) is built to handle all of these inputs. This guide explains what each one means and why it matters.

The Upfront Costs of Buying

Before you make a single mortgage payment, buying a home costs money — often a significant amount. You need to include:

**Deposit:** Typically 5–20% of the purchase price. This is not a cost that disappears — it becomes your initial equity — but it does represent capital that is no longer liquid. For a £280,000 property with a 10% deposit, that is £28,000 tied up immediately.

**Stamp Duty Land Tax:** On a £280,000 purchase by a standard buyer in 2026, SDLT is £3,500 (2% on £125,001–£250,000, plus 5% on £250,001–£280,000). First-time buyers pay nothing on the first £300,000, so may pay zero.

**Conveyancing fees:** Expect £1,200–£2,500 for a freehold purchase. Leasehold and new builds cost more due to additional legal work. Use our [conveyancing calculator](/conveyancing-calculator) for a more precise estimate.

**Survey costs:** A HomeBuyer Report costs £400–£700. A full Building Survey on an older property can be £800–£1,500.

**Mortgage arrangement fee:** Many competitive mortgage products carry arrangement fees of £999–£1,999. These can be added to the loan (costing you more over time via interest) or paid upfront.

**Removal costs:** A typical house move costs £800–£2,000 for a removal company, depending on distance and volume of belongings.

In total, on a £280,000 purchase, expect upfront costs (excluding deposit) of £7,000–£12,000.

Monthly Costs: Buying

Once you have completed on a purchase, the monthly costs you need to track are:

• **Mortgage repayment** (capital and interest on a repayment mortgage)
• **Buildings insurance** (typically £150–£300 per year)
• **Contents insurance** (typically £100–£250 per year)
• **Service charge** (leasehold only — can be £1,200–£4,000 per year)
• **Ground rent** (older leasehold only — most new leases post-2022 are peppercorn)
• **Maintenance and repairs** — budget 1% of property value per year as a rule of thumb (£2,800 per year on a £280,000 home)
• **Mortgage life insurance / critical illness cover** (optional but advisable)

Monthly Costs: Renting

Renting looks simpler monthly. You pay rent, and optionally contents insurance. But the calculation is not complete without including:

• **Annual rent increases** — UK rents have been rising at 5–8% per year recently. Even at 3% annual increases, rent on a £1,200 per month flat reaches £1,610 after ten years.
• **Tenancy deposit** — five weeks' rent, held in a scheme. Not a cost, but capital you cannot access.
• **Moving costs** — tenants move more frequently than owners, typically every 2–4 years, accumulating removal and setup costs.

The Opportunity Cost of a Deposit

This is the calculation most people miss. If your deposit is £28,000 and it goes into a property, it cannot go into investments. If a globally diversified stocks and shares ISA returns an average 7% per year over 25 years, £28,000 grows to approximately £152,000.

That is not a reason never to buy — property also appreciates and you benefit from leverage — but it is a genuine cost of ownership that the [buy vs rent calculator](/buy-vs-rent-calculator) factors into its analysis.

Capital Growth and Equity Accumulation

The major financial argument for buying is that you accumulate equity through two mechanisms:

1. **Capital repayment:** Each month, a portion of your mortgage payment reduces your outstanding loan balance. On a 25-year repayment mortgage at 4.4% for £252,000 (90% of £280,000), you repay approximately £4,500 of capital in year one, rising to around £7,000 by year five as the interest component shrinks.

2. **House price appreciation:** The UK long-run average house price growth is 3–4% annually. On a £280,000 property, 3% growth adds £8,400 to your equity in year one alone.

These two mechanisms together can be powerful — but only if you stay long enough to benefit.

How to Use the Break-Even Period

The [buy vs rent calculator](/buy-vs-rent-calculator) produces a break-even year: the point at which the total financial position of buying overtakes the total financial position of renting (including the invested deposit alternative).

• Break-even under five years: buying wins quickly.
• Break-even five to eight years: buying is reasonable if you plan to stay.
• Break-even over ten years: buying looks marginal; renting may be equally rational.

The break-even period is most sensitive to three inputs: the purchase price relative to rent (the price-to-rent ratio), the mortgage rate, and the assumed investment return on alternative capital.

Practical Tips for Accurate Inputs

• Use actual mortgage quotes, not advertised headline rates. Your rate depends on your LTV and credit profile.
• Use local rental data from Rightmove or Zoopla averages, not national figures.
• Be conservative on house price growth. Planning for 5% annual growth because it happened historically is optimistic; 2–3% is more prudent for 2026 planning.
• Do not ignore maintenance costs. Many first-time buyers are shocked by boiler replacements, roof repairs, and damp remediation.

Run your personalised calculation now at our [buy vs rent calculator](/buy-vs-rent-calculator) and see exactly when — and if — buying makes financial sense for your situation.