Mortgage Jargon Buster | A–Z Guide for First-Time Buyers (UK)

A friendly, no-jargon A–Z guide to UK mortgage terms — from LTV and affordability to exchange, completion, ERCs, surveys and fees. Everything buyers get confused about, explained simply with real examples. We weren’t taught this at school, and you’re not expected to know it.

Your simple, friendly A–Z guide to mortgage jargon

Buying your first home is exciting… but let’s be honest, it can also feel like learning a brand-new language overnight.

Suddenly everyone’s talking about LTVs, ERCs, exchange, completion, underwriting and surveys — and it can leave you thinking, “Why does this feel so complicated?!”

You’re not silly for finding it confusing. This stuff is genuinely full of jargon.

So I’ve created this A–Z Mortgage Jargon Buster to explain everything in simple, human terms — the way I’d explain it to you on a call. No finance waffle, no scary language, just clear explanations and real examples you can actually understand.

A - Mortgage Terms Explained

Affordability

How much a lender thinks you can safely borrow based on your income, credit history, bills and commitments (like car finance, childcare, loans, etc.).
👉 Example: You earn £35,000, but you have £600 a month going out in commitments — that affects what you can borrow.

Agreement in Principle (AIP)

Another name for a Decision in Principle — an initial check showing how much you might be able to borrow. Most lenders do this as a soft search, so it usually won’t affect your credit score.

Application (Full Mortgage Application)

This is the “real” application stage where you submit all your documents (payslips, bank statements, ID, proof of deposit, etc.) and the lender fully assesses your case.

Arrangement Fee

A fee the lender charges for setting up your mortgage deal. You can often add this to your mortgage — but remember, you’ll then pay interest on it.

Arrears

When you miss one or more mortgage payments.

APRC (Annual Percentage Rate of Charge)

This shows the true overall cost of your mortgage as a percentage over the full mortgage term (e.g. 25–40 years), including your deal rate and what you’re likely to pay after it ends (usually the SVR).
👉 Tip from me: don’t let your deal just roll onto SVR — that’s usually the most expensive rate. Either do a product transfer or remortgage before that happens.

B - Mortgage Terms Explained

Bank Statements (for mortgage)

Lenders usually ask for 3 months of statements to check your income, spending habits and where your deposit came from.

Borrowing Capacity

The maximum amount a lender is likely to let you borrow.

Broker Fee

The fee you may pay to a mortgage adviser (like me!) for arranging your mortgage.

Building Survey

A very detailed check of a property’s structure and condition — this is your survey, not the lender’s valuation.

C - Mortgage Terms Explained

Completion

The big day! This is when you legally become the homeowner and finally get your keys.

Conditional Offer

A mortgage offer that depends on certain things being met (for example, valuation, documents, or paying off a loan).

Conveyancing

The legal side of buying or selling a home — basically the solicitor bit.

Credit Score

A number that reflects how reliable you are with borrowing.

County Court Judgment (CCJ)

A court order for unpaid debt — this can make getting a mortgage more difficult.

D - Mortgage Terms Explained

Decision in Principle (DIP / AIP / MIP)

A lender’s initial indication of how much you could borrow.

Default

Failing to repay a debt as agreed.

Deposit

The money you put towards buying your home.

Deposit Source / Source of Funds

Proof showing where your deposit came from (savings, gifted money, inheritance, etc.).

Discount Rate Mortgage

A mortgage where your rate is discounted from the lender’s standard rate for a set period.

Down-valuation

When the lender values a property lower than the agreed purchase price.

E - Mortgage Terms Explained

Early Repayment Charge (ERC)

A penalty for paying off your mortgage early or changing deal during a fixed term.
👉 In simple terms: the lender charging you the interest they would have made if you’d stayed on the deal.

Equity

The part of the home you actually own.
👉 Example:
Property = £200,000
Mortgage = £150,000
Your equity = £50,000

Exchange of Contracts

The point when the sale becomes legally binding — and you need buildings insurance in place from this day.

F - Mortgage Terms Explained

Fixed Rate Mortgage

Your interest rate stays the same for a set time (usually 2, 3, 5 or 10 years). After that, you move to SVR unless you switch deal.

First-Time Buyer (FTB)

Someone buying their first home. Some lenders may still treat you as a first-time buyer if you haven’t owned property for around 3 years.

Freehold

Owning both the property and the land it sits on.

G - Mortgage Terms Explained

Gifted Deposit

Money given to you (usually by family) toward your home deposit.

Gifted Deposit Letter

A signed document from the person gifting you the money confirming it doesn’t need to be repaid.

Ground Rent

A fee some leaseholders pay to the freeholder.

Guarantor

Someone who agrees to take responsibility if you can’t keep up with mortgage payments.

H - Mortgage Terms Explained

Hard Credit Check

A full credit search that leaves a visible mark — usually done at full application stage.

High Street Lender

Big banks and building societies that offer mortgages.

HomeBuyer Report

A property survey that highlights potential issues — this is your survey, not the lender’s valuation.

I - Mortgage Terms Explained

Interest Rate

How much the lender charges you for borrowing money.

Interest-Only Mortgage

You only pay the interest each month — so you still owe the full mortgage balance at the end.

J — Mortgage Terms Explained

Joint Borrower Sole Proprietor (JBSP)

Two people on the mortgage, but only one legally owns the property — often used to boost affordability.

Joint Tenants

You both own 100% of the property together — if one of you dies, the other automatically inherits.

L — Mortgage Terms Explained

Land Registry

The official record of property ownership in England and Wales.

Leasehold

You own the property but not the land — usually comes with ground rent and service charges.

Lender

The bank or building society giving you the mortgage.

Lender Criteria

Each lender has different rules about who they’ll lend to (credit, job type, income, etc.).

Local Authority Search

Legal checks your solicitor does about the property and area.

Loan-to-Value (LTV)

Your mortgage compared to the property value.
👉 Example:
House £200,000
Deposit £10,000
Mortgage £190,000 → 95% LTV

M — Mortgage Terms Explained

Market Value

What a property is realistically worth.

Mortgage

A loan secured against your home.

Mortgage Offer

Formal confirmation that a lender will lend to you.

Mortgage Term

How long your mortgage lasts (e.g. 25–40 years).
👉 This is different from your fixed deal (2/3/5/10 years).

Mortgage Valuation

A check for the lender to confirm the property’s value — not a full survey for you.

Mortgage in Principle (MIP)

Another name some lenders use instead of AIP/DIP.

O — Mortgage Terms Explained

Offer Expiry

The date your mortgage offer runs out — you must complete before this. Some lenders allow extensions, especially for new builds.

Overpayment

Paying more than your required monthly payment — this reduces your balance and the interest you pay over time.

P — Mortgage Terms Explained

Payment Holiday

A temporary break from mortgage payments (usually needs lender approval).

Porting a Mortgage

Taking your existing mortgage deal to a new home — helpful to avoid ERCs.

Product Fee

A fee attached to a specific mortgage deal.

Product Transfer

Switching to a new deal with your current lender when your initial rate ends.

Proof of ID & Address

Documents like passport, driving licence and recent utility bills that lenders require.

R — Mortgage Terms Explained

Redemption

Paying off your mortgage in full (for example, if you win the lottery — but check for ERCs!).

Redemption Statement

A document showing exactly what you owe and any charges due.

Remortgage

Switching your mortgage to a new lender.

Repayment Mortgage

You pay back both the loan and interest each month.

Restrictive Covenant

A legal rule limiting what you can do with a property.

S — Mortgage Terms Explained

Searches

Legal checks carried out by your solicitor.

Secured Loan

A loan that uses your property as security.

Service Charge

Fees paid by leaseholders for building maintenance.

Shared Ownership

Buying part of a property and renting the rest.

Soft Credit Check

A credit check that doesn’t affect your score.

Solicitor / Conveyancer

The legal professional handling your property purchase.

Standard Variable Rate (SVR)

A lender’s default rate after your fixed deal ends — usually very expensive.

Stamp Duty (SDLT)

A tax paid when buying a property above a certain price.

Structural Defects

Serious problems with a building’s structure.

Survey

A professional inspection of a property’s condition.

T — Mortgage Terms Explained

Telegraphic Transfer Fee

A bank fee for sending completion funds.

Tenants in Common

You can own different shares (e.g. 60/40) and leave your share to whoever you choose in your will.

Title Deeds

Legal documents proving property ownership.

Tracker Mortgage

A rate that follows the Bank of England base rate — so your payments can change month to month.

U — Mortgage Terms Explained

Underwriting

The lender’s detailed checks before approving your mortgage.

Underwriter

The person who reviews and assesses your application.

Unconditional Offer

A mortgage offer with no outstanding conditions.

Upfront Costs

All the costs of buying a home — deposit, solicitor fees, survey, stamp duty, etc.

V — Mortgage Terms Explained

Valuation

A lender’s assessment of a property’s value.

Variable Rate Mortgage

A mortgage where the interest rate can change at any time.

Z — Mortgage Terms Explained

Zero Hours Contract Mortgage

A mortgage available for workers with irregular income, subject to lender criteria.

Still confused? That’s completely normal — most people are at this stage.

If you’re buying your first home and feeling overwhelmed, you don’t have to figure it out alone.

I help buyers across the UK make sense of the process, step by step, without the jargon or the stress.

When you’re ready, you can book a chat on my website and we’ll take it at your pace.