How Much House Can You Afford? A Complete Home Affordability Guide
Buying a home is one of the biggest financial decisions you will ever make. The excitement is real — and so is the risk of stretching too far. This guide helps you separate what a lender will approve from what you can truly afford, so you can make an informed, confident decision.
Throughout this guide, we will use our Mortgage Calculator to work through real numbers. You can follow along with your own figures.
What “Affordability” Really Means
There are two different answers to “how much house can I afford?”
What a lender will approve is based on your income, credit score, and existing debts. Lenders use underwriting ratios that sometimes stretch much further than is comfortable.
What you can comfortably afford is lower — and more honest. It accounts for your actual lifestyle, future goals, and the real cost of homeownership beyond the mortgage payment.
This guide focuses on the second definition.
The 28/36 Rule
The 28/36 rule is a widely-used affordability guideline:
- 28% of gross monthly income on housing costs (mortgage principal + interest, property taxes, insurance, HOA fees)
- 36% of gross monthly income on total debt payments (housing + car loans, student loans, credit cards, personal loans)
Lenders typically use 28/36 as their outer limit. For a more conservative — and realistic — budget, consider 25/33. That extra buffer makes a real difference when unexpected costs arise.
Worked Example: James and Priya
James and Priya are a couple looking to buy their first home. Here is their financial picture:
| Income & Debts | Amount |
|---|---|
| Combined gross monthly income | £5,000 |
| Car loan payment | £250 |
| Student loan payment | £200 |
| Credit card minimum | £100 |
| Total existing debt payments | £550 |
Step 1: Maximum Housing Payment
Using the 28% guideline:
£5,000 × 28% = £1,400 maximum monthly housing payment
Using the conservative 25% guideline:
£5,000 × 25% = £1,250 conservative monthly housing payment
Step 2: Total Debt Check
With a £1,400 mortgage payment, total debt would be:
£1,400 + £550 = £1,950 → 39% of income (exceeds 36% limit)
With a £1,250 mortgage payment:
£1,250 + £550 = £1,800 → 36% of income (within limit)
Step 3: What House Price Does This Buy?
Using our Mortgage Calculator with a £1,250 monthly payment, assuming:
- Interest rate: 5%
- Loan term: 30 years
- Down payment: 10% (£25,000 on a £250,000 home)
- Property tax estimate: £200/month
- Home insurance estimate: £50/month
Affordable home price range: ~£230,000 – £250,000
That is a far cry from what a lender might approve based on £5,000/month income. But it is a payment they can live with — and still have room for savings, emergencies, and life.
Enter your own numbers into the Mortgage Calculator to find your personal affordable range.
Deposit Planning
Your down payment (deposit) affects everything: the mortgage rate you qualify for, whether you need insurance, and how large your monthly payment is.
| Deposit % | On £250,000 Home | Typical Impact |
|---|---|---|
| 5% | £12,500 | Higher rate, may need MIP |
| 10% | £25,000 | Better rates available |
| 20% | £50,000 | Best rates, no MIP needed |
If James and Priya need £25,000 for a 10% deposit and can save £500/month, using our Savings Goal Calculator:
- Target: £25,000
- Monthly savings: £500
- Time to goal: 50 months (~4 years)
At 20% (£50,000) with the same £500/month: 100 months (~8 years). They may choose a middle path — 10% to get in sooner, accepting slightly higher monthly payments.
Plan your own deposit with the Savings Goal Calculator.
The Hidden Costs of Homeownership
First-time buyers often forget these costs. They add up fast:
- Property taxes — Typically 0.5–2% of the home value per year. On a £250,000 home, that is £1,250–£5,000/year.
- Home insurance — Required by lenders. ~£500–£1,200/year depending on location and coverage.
- Maintenance and repairs — Budget 1% of the home value per year. On a £250,000 home: £2,500/year. This covers routine upkeep plus the inevitable big repairs (roof, boiler, plumbing).
- Utilities — Often higher in a house than an apartment. Budget £200–£400/month for gas, electric, water, internet.
- HOA fees — If applicable. £100–£500/month. Check before you buy.
- Closing costs — 2–5% of the purchase price. On £250,000: £5,000–£12,500. This is cash you need on top of the deposit.
- Moving and furnishing — £1,000–£5,000 for movers, new furniture, curtains, appliances.
How Loan Terms Affect Affordability
Using our Loan Calculator, here is how term affects a £225,000 mortgage at 5%:
| Term | Monthly Payment | Total Interest |
|---|---|---|
| 15 years | ~£1,779 | ~£95,300 |
| 20 years | ~£1,485 | ~£131,400 |
| 25 years | ~£1,315 | ~£169,500 |
| 30 years | ~£1,208 | ~£209,800 |
The 30-year option has the lowest payment but costs over £114,500 more in interest than the 15-year. Use our Loan Calculator to compare terms with your own figures.
Common Affordability Mistakes
- Borrowing the maximum the lender offers. Lenders approve what you can repay, not what leaves room for a life. Stay well below their limit.
- Ignoring hidden costs. If you only budget for the mortgage payment, the first repair bill could wipe you out. Budget 1% of home value for maintenance.
- Buying before you are ready. Rushing because of FOMO (fear of missing out) or pressure leads to overstretching. There will always be houses. Your financial stability matters more.
- Using all your savings for the deposit. You need cash left over for closing costs, moving, and at least a small emergency fund after the purchase.
- Forgetting about lifestyle. A lower mortgage means you can still travel, save, invest, and enjoy life. A stretched budget traps you.
Practical Advice
- Get pre-approved before shopping. Know your number before you fall in love with a house you cannot afford.
- Pay off high-interest debt first. Credit card debt at 20% costs more than any mortgage saves. Use our Debt Payoff Calculator to plan (Guides 1 & 2).
- Build your emergency fund before you buy. Our emergency fund guide (Guide 4) explains why this matters.
- Understand how compound interest affects your deposit. See our compound interest guide (Guide 3) to compare investing vs buying.
- Use the calculators before you talk to a lender. The numbers do not lie. Model different scenarios with our Mortgage Calculator and Loan Calculator.
Related Reading
- Mortgage Calculator — estimate your monthly payment
- Loan Calculator — compare terms and rates
- Savings Goal Calculator — plan your deposit
- Compound Interest Calculator — compare investing vs buying
- Debt Payoff Calculator — clear debt before buying
- Guide 1: Getting Out of Debt Faster
- Guide 2: Snowball vs Avalanche
- Guide 3: How Compound Interest Builds Wealth
- Guide 4: Building Your First Emergency Fund
- Personal Finance Hub
💡 Next Decision
If you want to estimate your monthly payment: Use our Mortgage Calculator. Adjust the price, deposit, rate, and term to find a payment you are comfortable with.
If you want to compare 15-year vs 30-year options: Use our Loan Calculator to see the trade-off between lower payments and total interest.
If you need to plan your deposit: Use our Savings Goal Calculator to find out how much to save each month.
If you are deciding between buying and investing: Use our Compound Interest Calculator to see what your deposit could grow to if invested.
Frequently Asked Questions
How much do I need for a deposit?
Minimum deposits vary by country and lender. In the UK, 5–10% is common for first-time buyers. Aim for 20% if possible — it gives you the best rates and avoids mortgage insurance (MIP).
Should I buy or rent?
Buying makes more sense if you plan to stay in the same place for at least 5–7 years. Renting gives you flexibility and avoids transaction costs. Use our calculators to compare the numbers for your specific situation.
What is the best mortgage term?
There is no universal answer. A 30-year term gives the lowest monthly payment. A 15-year term saves significant interest but requires higher payments. Choose the term that fits your budget today — you can always overpay or refinance later.
Should I pay off debt or save for a house first?
Save a small emergency fund first (£500–£1,000). Then prioritise high-interest debt (credit cards, personal loans). Then save for your deposit while making minimum payments on low-interest debt (student loans, car loans). Use the Debt Payoff Calculator and read Guide 1 for details.
How do interest rates affect what I can afford?
Dramatically. At 4%, a £1,200 monthly payment buys a ~£250,000 home. At 6%, the same payment buys only ~£200,000. Use our Mortgage Calculator to see how rate changes affect your budget.
Your Next Step
You now have the framework. The next step is simple: open our Mortgage Calculator, enter your income, debts, and target home price, and see the numbers for yourself. Knowledge turns home buying from intimidating into achievable.