As a rough guide, a £300,000 mortgage usually needs a household income somewhere between £55,000 and £75,000, depending on your deposit, your other commitments and how the lender assesses you. Most lenders work to around 4 to 4.5 times income, so £300,000 of borrowing lands near £67,000 at 4.5 times. A smaller number of lenders will stretch to 5 or 5.5 times income for the right applicant, which can bring the figure closer to £55,000. Below we break down exactly how those numbers are reached, what deposit you need, what the monthly repayments look like and what buying a £300,000 home really costs around Sleaford.
This question comes up a lot with first-time buyers looking at local new build developments. A good local example is Bellway’s Quarrington Edge at Handley Chase, just south of Sleaford, which offers a mix of 2, 3, 4 and 5 bedroom homes, with larger four-bedroom detached houses priced from around £379,950 (illustrative, as of July 2026). A £300,000 purchase sits neatly in the middle of that range, so it is a realistic figure to plan around.
What salary do you need for a £300,000 mortgage?
The honest answer is that it depends on the size of your mortgage rather than the price of the house, and the mortgage depends on your deposit. If you put down a 5% deposit of £15,000, you are borrowing £285,000, not the full £300,000. Here is how that £285,000 mortgage maps onto income at the common multiples used in 2026:
| Income multiple | Household income needed for a £285,000 mortgage |
|---|---|
| 4 times income | around £71,250 |
| 4.5 times income | around £63,300 |
| 5 times income | around £57,000 |
| 5.5 times income | around £51,800 |
These are illustrative and rounded. The multiple you actually qualify for is not a free choice; it is set by the lender based on your income type, credit profile and existing commitments. A couple each earning £26,000 (£52,000 combined) could reach £285,000 at a 5.5 times lender, while the same borrowing would need roughly £63,000 combined at a more typical 4.5 times lender.
How do lenders decide how much you can borrow?
Income multiples are the starting point, but they are not the whole story. In the UK, the Financial Conduct Authority limits how much lending each firm can do above 4.5 times income to 15% of its new mortgages in any rolling quarter, which is why higher multiples are rationed rather than offered to everyone. In July 2025 the Bank of England’s Financial Policy Committee eased how that limit is applied, and through 2025 and 2026 several mainstream lenders raised their maximum multiples. A handful now offer 5.5 times income as standard, with 6 to 6.5 times reserved for specific higher-earning profiles.
On top of the multiple, every lender runs an affordability assessment. They look at your take-home pay against your regular outgoings: car finance, credit cards, loans, childcare, student loan deductions and pension contributions. Two households on identical salaries can be offered very different amounts because one has a car on finance and a credit card balance and the other has neither. They also stress test the mortgage, checking you could still afford the payments if rates rose. This is exactly where sitting down with the former bank managers at Spolton Mortgages helps, because we can see which lenders will treat your particular income most generously before you apply.
What deposit do you need for a £300,000 home?
The minimum is typically 5%, which is £15,000 on a £300,000 property. Since July 2025 the government’s permanent Mortgage Guarantee Scheme has supported 5% deposit lending on repayment mortgages up to £600,000, and it is open to first-time buyers and home movers alike, not just first-timers. The trade-off is that the lowest advertised rates sit at higher deposit levels. Here is how the deposit changes both the mortgage and the income you are likely to need:
| Deposit | Deposit amount | Mortgage | Income at 4.5x | Income at 5.5x |
|---|---|---|---|---|
| 5% | £15,000 | £285,000 | around £63,300 | around £51,800 |
| 10% | £30,000 | £270,000 | around £60,000 | around £49,100 |
| 15% | £45,000 | £255,000 | around £56,700 | around £46,400 |
| 20% | £60,000 | £240,000 | around £53,300 | around £43,600 |
A bigger deposit lowers your monthly cost twice over: you borrow less, and you often unlock a lower interest rate. Moving from a 5% to a 10% deposit, and again to 15%, usually steps you into better rate bands, so it is worth saving to the next threshold if you are close.
What would the monthly repayments be on a £300,000 mortgage?
The monthly payment depends on your rate and term far more than most buyers expect. The figures below are for a £285,000 repayment mortgage (a 5% deposit on £300,000) over 25 years. Rates are illustrative and as of July 2026, when the Bank of England base rate is 3.75%, competitive fixed rates start from around 4.3%, and the average standard variable rate is around 7.13%.
| Interest rate | Approximate monthly payment (£285,000, 25 years) |
|---|---|
| 4.3% (competitive fixed) | around £1,552 |
| 5.0% | around £1,666 |
| 5.5% | around £1,750 |
| 7.13% (average SVR) | around £2,039 |
The gap between a fixed rate and the standard variable rate is nearly £500 a month here, which is why very few people stay on their lender’s SVR by choice. Stretching the term to 30 years lowers the monthly figure but increases the total interest you pay over the life of the loan, so it is a balance rather than a free win. You can model your own numbers with our Mortgage Repayment Calculator.
Do first-time buyers pay stamp duty on a £300,000 home in Sleaford?
This is genuinely good news for first-time buyers at this price. First-time buyer relief means no Stamp Duty Land Tax is due on a purchase up to £300,000, so a £300,000 home costs you £0 in stamp duty. The relief tapers above that: between £300,001 and £500,000 you pay 5% on the portion over £300,000, and if the price tips over £500,000 the relief is lost entirely.
If you are not a first-time buyer, the standard bands apply: nothing on the first £125,000, 2% on the slice from £125,001 to £250,000, and 5% from £250,001 upwards. On a £300,000 home that works out at £5,000 for a home mover. Buyers of an additional property, such as a second home or a buy to let, pay a further 5% surcharge on top. You can check your own position with our Stamp Duty Calculator.
What other upfront costs should you budget for?
The deposit is only part of the cash you need on completion. On a £300,000 purchase, typical additional costs include:
- Solicitor and conveyancing fees: £1,200 to £1,800
- Survey and valuation: £300 to £700
- Mortgage product or arrangement fee: £0 to £999 or more (often addable to the loan)
- Removal costs: £300 to £800
- Initial furnishing, flooring and white goods: £1,500 to £5,000 or more
So while a 5% deposit is £15,000, a more realistic cash target for a first-time buyer is closer to £18,000 to £22,000 once fees and setting-up costs are included. New build buyers sometimes benefit from developer incentives such as help with fees or flooring, which is worth asking about when you visit a site like Quarrington Edge.
Can you get a £300,000 mortgage on one salary?
It is possible but demanding. On a single income you would generally need to earn around £63,000 at 4.5 times, or around £52,000 if you qualify for a 5.5 times lender, to support a £285,000 mortgage. That is achievable for higher earners, but for many people a joint application is what makes a £300,000 home realistic, because two incomes are combined before the multiple is applied. In 2026 one mainstream lender moved to 6.5 times income for joint applicants with a combined income above £150,000, though that sits at the top end and is not typical.
A word of caution worth repeating: the maximum a lender will offer is not automatically the amount you should borrow. The right figure is the one that still leaves you comfortable when the boiler needs replacing or your circumstances change. Our team would always rather help you buy a home you can enjoy than the largest one the calculator allows.
What if you are self-employed or your income varies?
Variable income does not rule you out, but it is assessed differently. Self-employed applicants are usually asked for two or three years of accounts or tax calculations, and lenders vary widely in how they treat retained profit, dividends and a rising trend in earnings. Bonuses, commission and overtime may be counted in full, in part, or not at all, depending on the lender. Two firms can arrive at very different lending figures from the exact same paperwork, which is where knowing the market makes a real difference. If this is you, our self-employed mortgage advice explains how to present your income to best effect, and our first-time buyer mortgage advice covers the wider process.
How much house does £300,000 buy around Sleaford?
Compared with much of the country, £300,000 goes a long way in central Lincolnshire. Around Sleaford, Quarrington, North Hykeham and the villages between Lincoln and Grantham, that budget commonly reaches a modern three or four-bedroom family home, including many new builds. The same money buys noticeably less in and around Lincoln city or the more sought-after commuter villages, so the local variation is real. Because affordability is the deciding factor at this price, it is well worth confirming your borrowing figure before you start viewing, so your offers are grounded in what you can actually arrange.
Common questions
Is a 5% deposit enough to buy a £300,000 home?
Yes, in many cases. The permanent Mortgage Guarantee Scheme supports 5% deposit lending up to £600,000, so a £15,000 deposit can be enough. The rate will usually be higher than at 10% or 15%, so it is worth comparing the monthly cost at each level. Our low deposit mortgage advice looks at the options.
Does a car loan or credit card reduce how much I can borrow?
Yes. Regular commitments are deducted in the affordability assessment, and a car finance payment of a few hundred pounds a month can reduce your maximum mortgage by tens of thousands. Clearing or reducing short-term debt before you apply can meaningfully improve what you are offered.
Should I get an agreement in principle before viewing?
It is a sensible first step. An agreement in principle gives you a realistic budget and shows estate agents and developers you are a serious buyer, which can matter on a popular new build plot. It is not a full mortgage offer, but it puts you on solid ground before you make an offer.
Work out your own £300,000 budget with the team in Sleaford
Every situation is different, so the best place to start is our Mortgage Affordability Calculator to estimate what you could borrow, and our Mortgage Deposit Calculator to plan your savings target. When you are ready to talk it through, the former bank managers at Spolton Mortgages help buyers across Sleaford, Quarrington, Lincoln, Grantham, North Hykeham and the surrounding villages understand what is genuinely possible before committing to viewings or offers. As a whole-of-market firm we can compare lenders to find the one that treats your income most favourably. You can see our costs on our fees page or get in touch for a friendly, no-obligation chat.
Your home may be repossessed if you do not keep up repayments on your mortgage.
