From Pre-Approval to Keys: Understanding the Mortgage Process for First-Time Buyers
Buying your first home is exciting…
But the mortgage process? It can feel like an absolute nightmare.
Between steps, terms and paperwork there is a lot to think about before you even begin.
Here’s the good news:
There were approximately 390,324 first-time buyer mortgage transactions in the UK during 2025 — an increase of 18% year-on-year.
This guide covers the entire process of residential mortgages from start to finish. (pre-approval through to settlement.)
Let’s jump in!
Here’s what’s coming up:
- What Is A Residential Mortgage?
- Step 1: Get Your Finances Ready
- Step 2: Mortgage Pre-Approval Explained
- Step 3: House Hunting & Making An Offer
- Step 4: The Application & Underwriting Stage
- Step 5: Completion Day — Getting The Keys
- Common Mistakes To Avoid
What Is A Residential Mortgage?
A residential mortgage is financing to purchase your primary home.
A residential mortgage is different to a buy-to-let mortgage (which is used to purchase a rental property) or a commercial mortgage (for property that’s used for business purposes). For a residential mortgage, the home you buy is used as security for the loan.
Here’s how it works:
- You put down a deposit (a percentage of the property price)
- The lender covers the rest with the mortgage
- You pay it back over a set term (usually 25-35 years)
- The home becomes fully yours once the loan is paid off
They can take your property if you stop making payments. Heavy consequences…Which makes finding the right deal extremely important. Many first time buyers decide to use a professional mortgage broker in London when looking for the most suitable residential mortgage product. They will compare rates from numerous lenders, complete the onerous paperwork and guide you through the process avoiding costly errors.
Step 1: Get Your Finances Ready
Before you even think about applying, you need to get your money sorted.
Lenders look at three big things when deciding whether they’ll lend to you:
- Your deposit — the bigger, the better
- Your income — to check you can afford the repayments
- Your credit history — to see if you pay debts on time
Minimum deposit required by most UK lenders is 5%. However the larger deposit you can put down, the lower your interest rate will be. Average first time buyer deposit in England… £63,855. So save as much as you comfortably can.
Quick tips to get finance-ready:
- Pay off any credit card debt
- Stop applying for new credit cards or loans
- Check your credit score for free
- Keep your bank statements clean (no gambling, no overdrafts)
- Get on the electoral roll at your current address
This stage often takes the longest. But it’s the foundation of everything else.
Step 2: Mortgage Pre-Approval Explained
Pre-approval (“mortgage in principle” or “agreement in principle”) refers to verification by a lender of the amount they would likely lend.
It’s not a full mortgage offer… But it’s a strong signal.
Why pre-approval matters:
- Estate agents take you more seriously
- You know exactly what budget you’re working with
- It speeds up the offer process
- Sellers prefer buyers who already have one
Typically, getting pre-approved takes 1-2 days. You’ll have to provide payslips, ID, proof of deposit, bank statements. The lender will run a soft credit check when you apply — it doesn’t hurt your credit.
Most agreements in principle last 60-90 days. After that, you’ll need to renew it.
Step 3: House Hunting & Making An Offer
Now the fun part… Finding a home.
Hold the phone. Remember that even though a lender may allow you to borrow £300,000, it doesn’t mean you should spend that much. Stamp duty, legal fees, surveys, moving expenses and an adequate emergency fund are also all crucial to consider.
The average UK first time buyer is 33.9 years old. Think of how many years you have spent saving… When you find the right place, take your time. View it morning & evening. Ask questions. Don’t rush your offer.
When your offer is accepted the property goes “under offer” allowing you to proceed.
Step 4: The Application & Underwriting Stage
This is where things get serious.
You will complete a formal mortgage application and upload supporting documents. The lender will perform an underwriting process where they:
- Verify all your financial information
- Run a full (hard) credit check
- Arrange a property valuation
- Assess affordability against their criteria
The solicitor/licensed conveyancer deals with the legal side. They check the title, carry out local searches with the council and eventually exchange contracts. The underwriting process can take between 2-4 weeks. If something raises suspicions, the lender may request additional paperwork… so act promptly when they ask.
Disclaimer: Mortgage rates are getting better. Between Jan 20th 2025 and Jan 20th 2026 the average mortgage rate in the UK fell from 5.4% to 4.91%. Fix a great rate while you still can.
Step 5: Completion Day — Getting The Keys
You’ve made it…
On completion day your solicitor pays the money over to the seller’s solicitor. When it arrives the property becomes legally yours. You will receive a call from the estate agent telling you that you can now collect the keys.
Then it’s done. You’re a homeowner.
You only realize when moving just how many little fees there are at this stage — removals, utilities, insurance, first month’s bills. Make sure you have some money socked away so you aren’t panicked on day one.
Common Mistakes To Avoid
A few things trip up first-time buyers all the time:
- Changing jobs mid-application — lenders often pull offers over this
- Spending on credit cards before completion
- Skipping the survey to save money (a huge mistake)
- Not budgeting for extras like stamp duty and legal fees
- Choosing the wrong mortgage term without comparing options
Take your time at each stage. Rushing causes regret.
The Bottom Line
Buying your first home doesn’t have to feel confusing.
Buying a home used to be a straightforward process with clearly defined steps. Simplify the home buying process by thinking of it as 6 distinct steps. Prepare Your Finances, Get Pre Approved, Find Your Dream Home, Submit a Loan Application, Closing & Walk Away with the Keys. Each step is dependent on the successful completion of the previous one.
Yes, there’s forms. Yes it takes time. But thousands of people do it each month throughout the UK. With the proper preparation (and the right broker in your corner), you can too.
Ok secure your deposit, crunch your numbers right and take the plunge. You’re closer than you realize.
