Overview
The UK mortgage market is regulated by the Financial Conduct Authority under MCOB — the Mortgages and Home Finance: Conduct of Business sourcebook — which sets the rules for how lenders must assess affordability, disclose terms, and treat borrowers throughout the life of a mortgage. Whether you are buying your first home, remortgaging to a better deal, or navigating a problem with an existing mortgage, the system has specific rules that determine what lenders can do, what they must do, and what your rights are at each stage.
This page serves as a central hub for our detailed mortgage guides. Each one explains a specific aspect of the process, the regulatory framework behind it, and the practical implications for borrowers in England, Wales, Scotland, or Northern Ireland.
What Actually Decides a Mortgage Decision
Borrowers routinely focus on the wrong variable. Four things carry most of the weight, and only one of them is the credit score everyone worries about.
Affordability is assessed separately from creditworthiness. MCOB requires lenders to assess whether you can afford the borrowing, based on verified income and committed expenditure, and to stress-test against future rate rises. This is a distinct test from reading your credit file, and it is the one that most often produces a decline for applicants with clean credit. A strong score does not offset income that does not support the loan — see affordability versus credit score and why a remortgage gets declined.
How your income is evidenced matters as much as its size. Employed applicants with predictable salary are the model the system is built around. Self-employed income, contract income, bonus, commission and dividend income all need to be evidenced in ways that differ by lender, and lender policy varies far more here than borrowers expect: what lenders want to see from self-employed applicants.
Adverse credit is about age and type, not just presence. A default, a CCJ or a missed payment does not permanently exclude you. What matters is what kind of marker it is, how old it is, whether it is satisfied, and each lender's specific tolerance. There are realistic timelines: how long after a default and how long after a CCJ you can expect to be considered. A thin file can be as much of an obstacle as an adverse one.
An offer is not a guarantee. A mortgage offer can be withdrawn, and the circumstances in which that can happen are broader than most borrowers realise — a change in circumstances, a down valuation, or new information coming to light. Understanding this before exchange protects you: how offer withdrawal works and what to do if it happens.
IMPORTANT
Nothing on this page is a recommendation about a specific mortgage or lender. Mortgage suitability depends on your full circumstances, and advised sales carry regulatory protections that direct execution-only purchases do not.
Where to Start
Buying for the first time, work through the process end to end before approaching anyone: the UK mortgage timeline from offer to completion.
Comparing deals, the headline rate is not the cost. Fees, term and the true cost over the deal period frequently reverse the ranking: comparing two deals properly.
Moving home with an existing mortgage, check whether your deal can travel with you before you assume it cannot: how porting works.
Struggling with payments, engage with your lender early. MCOB imposes forbearance obligations, and the options available before arrears escalate are far better than those after: what happens before and after a missed mortgage payment and support routes if you are facing repossession.
The Mortgage Process
Understanding the mechanics of how a mortgage application moves from initial enquiry to completion — and what can go wrong at each stage.
Mortgage Products & Strategy
Different mortgage structures suit different circumstances. These guides explain the trade-offs involved in specific product types and financial decisions.
Problems, Risks & Protection
When things go wrong — or threaten to go wrong — during or after a mortgage, these guides explain the regulatory protections available and the practical steps to take.
Mortgages & Life Changes
Major life events — relationship breakdown, self-employment, debt — interact directly with the mortgage system. These guides explain how the regulatory framework handles those intersections.
Credit Score & Mortgage Eligibility
Your credit file plays a central role in mortgage underwriting. These guides explain how specific credit file entries affect mortgage applications and the realistic timelines for eligibility.
Mortgage Debt & Arrears
When mortgage payments are missed, a specific enforcement process begins. These guides explain the legal framework governing arrears, shortfall debt, and limitation periods.
Frequently Asked Questions
Sources and Further Reading
- FCA Handbook — MCOB — the Mortgages and Home Finance: Conduct of Business sourcebook governing affordability, disclosure, arrears and forbearance
- Financial Conduct Authority — regulation of mortgage lending and intermediaries
- FCA Register — check that a lender or broker is authorised
- Financial Services and Markets Act 2000 — the statutory basis for FCA regulation of mortgage lending
- Limitation Act 1980 — limitation periods for mortgage capital and interest
- Administration of Justice Act 1970 — the court's power to suspend possession where arrears can be cleared
- Financial Ombudsman Service — escalation route for mortgage complaints
- MoneyHelper — impartial government-backed mortgage guidance