Buying your first home in London can feel confusing, especially when you’re trying to understand how much deposit you need and how the Help to Buy equity loan affects your mortgage.
Our Help to Buy London calculator helps you quickly estimate:
- The deposit required
- The government equity loan amount
- The mortgage needed from the lender
- Your approximate monthly mortgage payments
This tool is designed for first-time buyers in London who want a quick estimate before speaking to a mortgage advisor or property developer.
Use the calculator below to see how much you could potentially borrow and what your home purchase structure may look like.
Help to Buy London Calculator
How the Help to Buy Scheme Works in London
Under the Help to Buy Equity Loan scheme (when it was active), the UK government supported first-time buyers purchasing a new-build home by providing an equity loan.
For homes in London, the scheme allowed buyers to borrow up to 40% of the property price from the government.
The typical structure looked like this:
| Component | Typical Amount |
| Buyer deposit | Minimum 5% |
| Mortgage from lender | Around 55% |
| Government equity loan | Up to 40% |
This structure meant buyers could purchase a property with a smaller deposit and a lower mortgage requirement, making London property more accessible.
Example: Help to Buy London Calculation
Let’s say you want to buy a £500,000 new-build home in London.
| Cost Breakdown | Amount |
| Property price | £500,000 |
| Buyer deposit (5%) | £25,000 |
| Government equity loan (40%) | £200,000 |
| Mortgage required (55%) | £275,000 |
With this structure, the buyer only needs to secure a £275,000 mortgage instead of the full property value, which can significantly reduce the monthly mortgage payments.
Our Help to Buy calculator automates this calculation for you instantly.
What the Help to Buy Calculator Shows
When you enter your property price and deposit in the calculator above, it estimates:
1. Required Deposit
The minimum amount you need to contribute as the buyer.
2. Government Equity Loan
For London properties, this could be up to 40% of the purchase price.
3. Mortgage Required
The remaining amount you need to borrow from a bank or mortgage lender.
4. Estimated Monthly Payment
An approximate monthly mortgage cost based on typical interest rates.
This gives you a realistic overview of affordability before starting the buying process.
Why Use a Help to Buy Calculator?
Many first-time buyers underestimate how much deposit or mortgage they need when buying a property in London.
Using a Help to Buy London calculator can help you:
- Plan your deposit savings
- Understand your mortgage affordability
- Compare different property price scenarios
- Prepare before speaking to a mortgage broker or lender
It also helps you see how changing the property price or deposit amount affects your monthly payments.
Who Can Use This Calculator?
This tool is most useful for:
- First-time buyers in London
- Buyers considering new-build properties
- People comparing Help to Buy vs normal mortgages
- Buyers planning their deposit and borrowing capacity
Even though the original Help to Buy scheme has closed, many buyers still use calculators like this to understand how equity-loan style structures affect affordability.
Important Notes About Help to Buy Calculations
While calculators are helpful, they provide estimates only. Your actual mortgage offer will depend on factors such as:
- Your income and employment status
- Credit score
- Current mortgage interest rates
- The property value and lender criteria
Always consult a qualified mortgage advisor or lender before making a final property purchase decision.
Frequently Asked Questions
How much deposit do I need for Help to Buy in London?
Most buyers need at least a 5% deposit of the property price. The government equity loan can cover up to 40% in London depending on eligibility.
Can I use this calculator outside London?
Yes, you can select your region to estimate equity loan percentages across England and the UK.
Does this calculator show monthly mortgage payments?
Yes, it provides an estimate based on property price, deposit, interest rate, and loan term.
Is Help to Buy still available in London?
The original Help to Buy scheme closed in 2023, but similar affordable home ownership schemes and shared ownership programs are still available.
Sources & References
The information and assumptions used in this Help to Buy London calculator are based on publicly available guidance from official UK housing and financial organizations.
- UK Government – Help to Buy: Equity Loan Scheme
Official government guidance explaining how the Help to Buy equity loan worked, including deposit requirements, government loan percentages, and repayment rules.
https://www.gov.uk/help-to-buy-equity-loan - Greater London Authority – Help to Buy London Programme
Information about how the Help to Buy scheme operated specifically for London buyers, including the higher equity loan limit available for London properties.
https://www.london.gov.uk/programmes-strategies/housing-and-land/home-ownership/help-buy - MoneyHelper – Help to Buy Equity Loan Explained
Independent financial guidance explaining how equity loans work, how interest is charged after the interest-free period, and what first-time buyers should consider.
https://www.moneyhelper.org.uk/en/homes/buying-a-home/help-to-buy-scheme - Nationwide Building Society – First-Time Buyer Mortgage Guidance
Mortgage affordability guidance and deposit information useful for understanding how lenders calculate borrowing limits and monthly repayments.
https://www.nationwide.co.uk/mortgages/first-time-buyers/ - Halifax – Mortgage and First-Time Buyer Advice
Information about mortgage affordability, deposits, and the process of buying a first home in the UK housing market.
https://www.halifax.co.uk/mortgages/first-time-buyers.html - Office for National Statistics – UK Housing Market Data
Official statistics on UK house prices, housing affordability, and property market trends.
https://www.ons.gov.uk/peoplepopulationandcommunity/housing
Disclaimer
This calculator provides illustrative estimates only and should not be considered financial advice.
Actual mortgage offers, deposit requirements, and loan eligibility may vary depending on lender criteria, credit history, income, and current market conditions.
Buyers should consult a qualified mortgage advisor or lender before making financial decisions.