Mortgages & Loans

First-time buyer mortgage guide: from deposit to completion

What first-time buyers need to know about deposits, agreements in principle, the costs of buying and the steps from offer to keys.

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By Calcmondo Editorial Team
8 min read · 25 August 2026 · Updated 14 October 2026
House key hanging from a tree branch

✓ Key takeaways

  • Most lenders need at least a 5% deposit, with better rates at larger deposits.
  • Get an agreement in principle before house hunting.
  • Budget for fees, surveys, legal costs and any Stamp Duty.
  • The Lifetime ISA can help eligible first-time buyers save.

Buying your first home is a big step, and the process can seem daunting. Breaking it into stages makes it manageable. This guide covers what to prepare, what it costs and how the process typically unfolds in England and Wales; Scotland has a different legal process.

1. Saving a deposit

Most lenders require at least 5% of the purchase price, though larger deposits usually unlock lower rates. Eligible first-time buyers aged 18 to 39 can open a Lifetime ISA and receive a 25% government bonus on up to £4,000 of savings a year, which can be used towards a first home worth up to £450,000 (GOV.UK Lifetime ISA). Withdrawing for other purposes usually triggers a charge.

2. Check affordability

Use our Mortgage Calculator to understand repayments, then get an agreement in principle from a lender or broker. It shows estate agents you are a serious buyer and tells you roughly how much you can borrow.

3. Budget for the costs of buying

  • Stamp Duty Land Tax in England and Northern Ireland (with first-time buyer relief on some purchases), Land Transaction Tax in Wales and LBTT in Scotland – check the current thresholds on GOV.UK.
  • Legal (conveyancing) fees and searches.
  • Survey – a basic valuation protects the lender; a fuller survey protects you.
  • Mortgage fees – product, arrangement and valuation fees.
  • Moving costs and initial furnishing.

4. Make an offer

When your offer is accepted, instruct a conveyancer and submit your full mortgage application. The lender will value the property and carry out a full credit check.

5. Exchange and completion

Once searches, surveys and the mortgage offer are in place, contracts are exchanged and the deposit is paid – at this point you are legally committed. Completion, when the money moves and you get the keys, usually follows a few weeks later.

6. After you move in

Set up buildings insurance (often required from exchange), register for council tax and note the date your initial mortgage deal ends so you can remortgage in good time.

Your home may be repossessed if you do not keep up repayments on your mortgage.

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