How first-time buyer mortgages work

Buying your first home is a big step—and the mortgage process can feel like a maze at first. This guide explains how first-time buyer mortgages work in practice, what lenders typically look at, the main mortgage types you’re likely to see, and the extra costs that can affect your budget.

What counts as a first-time buyer?

In most cases, a first-time buyer is someone who has not previously owned a home (either in the UK or abroad). However, lenders and government schemes may define “first-time buyer” slightly differently, so it’s important to check the exact definition that applies to the mortgage or programme you’re considering.

First-time buyers can also be buying in different ways—alone, with a partner, or with someone else (for example, through a joint mortgage). Some buyers may also be using a government-backed route or a new-build focused mortgage product.

The deposit: how much you usually need

A deposit is the part of the purchase price you pay upfront. The size of your deposit often affects the mortgage options available to you.

• Higher deposit usually means more choice: in general, a lower loan-to-value (LTV) can open up more product options.
• Lower deposit can be possible: some first-time buyer products are designed for smaller deposits, including certain new-build options.

Alongside the deposit, you’ll also need funds for mortgage fees and buying costs (more on this later).

Ways to help you build your deposit

If saving a deposit feels difficult, there are government savings structures that can support your plan. For example:

• Lifetime ISA (LISA): can provide a government bonus on eligible savings.
• Help to Buy ISA (where applicable): may be relevant depending on eligibility and timing.

These aren’t mortgage products themselves, but they can help you reach the deposit level needed for a mortgage.

How lenders decide how much you can borrow

Before a mortgage offer is made, lenders assess affordability and risk. That typically includes:

1. Income and outgoings

   • Lenders look at your monthly income and your regular commitments.
   • They may also consider how stable your income is.

2. Credit history

   • Your credit report helps lenders understand how you’ve managed borrowing and repayments.

3. Affordability stress testing

   • Even if you’re applying for a specific interest rate, lenders often test whether you could still afford repayments if rates were higher.

4. Loan-to-value (LTV)

   • LTV is the mortgage amount compared with the property value.
   • Your LTV can influence both the product types available and the pricing.

The outcome is a maximum borrowing figure (and sometimes a maximum LTV), based on the lender’s criteria.

Mortgage types you’ll commonly see

First-time buyer mortgages are available in different structures. The “best” option depends on how you want your monthly payments to behave over time.

Repayment vs interest-only

• Repayment mortgages: your monthly payments cover interest and reduce the balance over the term. This is the most common approach for many first-time buyers.
• Interest-only mortgages: you pay only the interest during the term, with the capital repaid separately at the end. These are less common for first-time buyers and usually require a credible plan for repaying the capital.

Fixed, variable and other rate structures

• Fixed-rate mortgages: your rate (and usually your monthly payment) is set for a defined period. This can help with budgeting.
• Variable-rate mortgages: the rate can change over time, which means your payments may rise or fall.
• Offset mortgages (where available): savings can be used to offset interest calculations, potentially reducing the interest charged on the mortgage.

Each option has trade-offs. A fixed rate can offer stability, while a variable rate may suit borrowers who are comfortable with payment changes.

Government schemes and first-time buyer routes

Some first-time buyers use government-backed programmes to make the purchase more achievable. The exact availability and eligibility can vary by scheme and by property type.

Help to Buy equity loan (where applicable)

An equity loan can reduce the deposit required by adding an additional loan component alongside your mortgage. This can help you reach a lower LTV and access products that might otherwise be out of reach.

Shared Ownership

Shared Ownership is designed for buyers who can’t afford to buy 100% of a home outright. Typically, you buy a share of the property and pay rent on the remaining share. Over time, you may be able to purchase additional shares.

Right to Buy / discounts for eligible tenants

Some buyers may be able to purchase their home at a discount if they meet the relevant criteria (for example, where they live in a council-owned property and qualify under the scheme rules).

New-build focused first-time buyer options

Some initiatives and mortgage products are aimed at new-build purchases, sometimes with lower deposit requirements. These can be relevant if you’re buying a property from a participating developer.

Note: scheme availability and rules can change. Always check the latest guidance before relying on a scheme.

Joint mortgages and guarantor mortgages

If you’re struggling to meet affordability or deposit requirements on your own, there are alternative structures that may help.

Joint mortgages

A joint mortgage is where more than one person applies to borrow. This can be useful when:

• you and a partner (or another eligible buyer) have combined income
• you can increase the deposit through shared savings

Joint ownership can be set up in different ways, and it’s important to understand how ownership shares and responsibilities work.

Guarantor mortgages

A guarantor mortgage involves a third party who agrees to cover payments if the borrower can’t. This can help some buyers access mortgage borrowing, but it also creates significant responsibilities for the guarantor.

Costs beyond the deposit

The deposit is only one part of the overall picture. When budgeting for a first-time buyer mortgage, consider the full set of costs that can arise before and after completion.

Stamp Duty Land Tax (SDLT)

SDLT is based on the purchase price and the buyer’s circumstances. First-time buyers may receive relief on part of the property price, which can reduce the tax bill compared with other buyers.

Mortgage fees

Depending on the mortgage product, you may encounter:

• arrangement fees
• booking fees
• valuation fees (so the lender can assess the property)

Some fees may be added to the mortgage, but that can increase the amount you repay over time.

Legal and survey costs

Buying a home involves legal work and property checks. Typical costs include:

• conveyancing/solicitor or licensed conveyancer fees
• survey costs (the type of survey chosen can affect the price)

These costs are separate from the mortgage itself, and they’re usually needed around the time you’re progressing the purchase.

How the process typically unfolds

While every purchase is different, the mortgage journey for first-time buyers often follows a similar pattern:

1. Choose a budget based on affordability and deposit.
2. Apply for a mortgage (often with supporting documents).
3. Lender assessment including affordability checks and credit review.
4. Property valuation to confirm the lender’s view of value.
5. Mortgage offer and then moving forward with the purchase.
6. Completion, followed by ongoing mortgage repayments.

Understanding where decisions are made—especially around affordability and valuation—can help you plan with less uncertainty.

Getting the right mortgage for your situation

First-time buyer mortgages aren’t one-size-fits-all. The “right” product depends on factors such as your deposit, income profile, credit history, the type of property you’re buying, and how you want your repayments to behave.

A mortgage adviser can help you compare options across different lenders and product types, so you’re not limited to what’s immediately visible on the high street.

This guide is for general information and education. Mortgage availability and eligibility can vary by lender, product and individual circumstances.