Mortgages Explained - The Simple Guide Everyone Wishes They Had

Whether you’re buying your first home, remortgaging, or simply trying to follow finance conversations, mortgage terminology can feel overwhelming.

This guide breaks everything down in simple, friendly language - no jargon, no judgement - so you can feel confident and informed.

Let’s make this easy...

What Is a Mortgage?

A mortgage is a long-term loan you use to buy a property. You repay it monthly, usually over 20–35 years.

Think of it as: Your home today → paid back gradually over time.

In the mortgage contract, the property is used as security for the loan. This means if you stop making payments, the lender has the right to repossess and sell the property to recover the money they lent you.

✏️ Why is it called a “mortgage”?

It comes from the Old French word morgage meaning “dead pledge”. The pledge “dies” when either:

• the loan is fully repaid, or

• the borrower fails to repay (defaults)

Most people need a mortgage because few can afford to buy a house outright. A mortgage lets you buy a property with a deposit (e.g., 20%) while borrowing the rest.

Can Anyone Get a Mortgage?

Not automatically. A lender must approve you through an application and underwriting process. They assess whether you can realistically afford the loan by checking your:

• income

• expenses

• existing debt

• employment type and stability

• credit score

• deposit size

• the property itself

Riskier borrowers are usually offered higher interest rates. In some cases, they may be declined.

What Is a Mortgage Deal (or Mortgage Product)?

A mortgage deal is:

• the interest rate

• the specific terms

• locked in for a set period (usually 2, 3, 5 or 10 years)

When the deal ends, you either:

1. switch to a new mortgage deal (remortgage), or

2. move onto your lender’s Standard Variable Rate (SVR) — usually more expensive.

⭐ Fixed-Rate Mortgage

A fixed-rate mortgage means your interest rate stays the same for the length of the deal.

Pros:

✔ Certainty

✔ Predictable monthly payments

✔ Easier for budgeting

✔ Protection if interest rates rise

Cons:

❗ Early repayment charges (ERCs) if you leave early

❗ You don’t benefit if interest rates fall

⭐ Tracker Mortgage Deal

A tracker mortgage moves in line with the Bank of England base rate, plus a fixed margin. Example :Base Rate + 0.39%

Pros:

✔ If the base rate drops, your payment falls

✔ Some trackers have no early repayment charges — great for flexibility

Cons:

❗ If the base rate rises, your payment increases

Trackers suit people who want flexibility or expect rates to fall.

Other Important Bits to Know

💸 Product Fees (Arrangement Fees)

Most deals come with a fee - often £999 or more. This fee covers the lender’s admin and cost of issuing the product. You can:

• pay it upfront, or

• add it to the mortgage (this increases the loan and total interest paid)

Some lenders offer “fee-free” deals, but these often have higher interest rates.

👉 Fees matter a lot when comparing deals — especially if you remortgage every 2 years.

⚠️ The "Standard Variable Rate" (SVR)

This is the lender’s interest rate that they will apply to your loan once your deal expires. Key points:

• It can change at any time

• It’s often significantly higher than your fixed or tracker deals

• Most people try to avoid being on SVR as it makes the mortgage an "expensive" debt

🔁 What Is Remortgaging?

Remortgaging means switching to a new mortgage deal:

• with the same lender (product transfer), or

• with a different lender

People remortgage to:

• get a better interest rate

• avoid SVR

• release equity (if the property has increased in value)

• borrow more

• change the mortgage term

• increase or reduce monthly payments

Because most mortgage deals last 2–5 years, everyone with a mortgage will typically remortgage multiple times over the life of their loan.

💎 Overpayments

Most lenders let you make overpayments (often up to 10% per year) without penalty.

Overpayments help you:

• reduce the total interest paid

• shorten the mortgage term

• build equity quicker

A common question is: Should I overpay my mortgage or invest my extra savings? (We cover this in another article.)

😵 Early Repayment Charges (ERCs)

If you leave a fixed rate before the end of the deal, you usually pay an ERC.

Why do ERCs exist?

• Lost interest: The lender expected to earn interest from you for the full deal term. Paying early cuts that short.

• Cost of funding: Lenders secure funding for mortgages in advance. If you repay early, they may face financial penalties or need to adjust those arrangements.

• Discouraging constant switching (industry justification): ERCs limit how often borrowers switch lenders for minor short-term rate changes.

👉 Know your ERC if flexibility matters to you.

🧮 Loan-to-Value (LTV)

LTV represents how much of the property’s value you’re borrowing.

LTV = Mortgage Amount ÷ Property Value × 100

Example: Property: £300,000Mortgage: £210,000LTV = 70%

Why it matters: Lower LTV = lower risk for the lender → better interest rates for you.

What Else Affects the Mortgage Deal You’re Offered?

💳 Credit Rating

A poor credit score doesn’t stop you from getting a mortgage, but it may mean:

• higher rates

• lower maximum borrowing

• fewer lenders willing to offer deals

💼 Affordability Assessment

Lenders assess:

• income

• spending habits

• existing debt

• dependents

• employment stability

• how your finances would cope if rates increased

In the UK, lenders often offer up to 4 - 4.5 times your salary, but this varies by lender and individual circumstances. For example if you have a salary of £50,000, a mortgage at 4.5 times your salary would be up to £225,000. 

🆘 Using a Mortgage Broker

A mortgage broker is a regulated professional who:

• searches the market for suitable products

• explains the small print

• checks affordability

• manages paperwork

• models long-term costs

• prevents costly mistakes

They either charge you a fixed fee, or get paid a commission by the lender when you purchase a product. Some brokers charge both a fee and commission. A good broker is especially valuable when rates are volatile or your situation is complex.

✨ Final Thoughts

Understanding mortgages shouldn’t feel difficult. Once you understand the basics, you can ask better questions, compare deals properly, and make confident decisions.

If you want to see how these concepts come together in a real-life example, read our other post on:

👉 How I Made My Remortgage Decision (with Real Numbers and a 5-Year Comparison)

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