Agreement in Principle
A lender does a soft credit and affordability check and indicates how much it would lend. An AIP (or 'decision in principle') strengthens your offer on a Cardiff property - agents take funded buyers more seriously.
Property Finance
The mortgage process, explained
From Agreement in Principle to completion, here's exactly how a mortgage comes together - what each stage involves, the main types of deal, and what lenders weigh up. With clear guidance for Cardiff HMO and buy-to-let purchases, where the rules differ.
The basics
The right finance, lined up early
A mortgage is a loan secured against the property you're buying, repaid over a term that often runs to 25 years or more. Getting the right one isn't just about the headline rate - it's about matching the deal to your plans, whether that's a first home in Cardiff or adding an HMO to a growing portfolio. The earlier you understand the process, the more confidently you can offer and the faster you can move.
Stage by stage
Your mortgage journey
Five milestones take you from a lender's first nod to keys in hand. Here's what happens, and roughly how far through you are at each point.
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10% there -
30% there Full application
Once your offer is accepted, you submit the full application with proof of income, ID, bank statements and deposit source. For HMO or buy-to-let, expect to evidence rental projections and landlord experience too.
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55% there Valuation & underwriting
The lender values the property to confirm it's worth the price, and an underwriter scrutinises your finances. HMOs are often valued on rental yield rather than bricks-and-mortar, so a specialist valuer is common.
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80% there Mortgage offer
If everything checks out, the lender issues a formal mortgage offer - usually valid for 3-6 months. Your conveyancer reviews the conditions and the offer is sent on to them and to you.
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100% there Completion
On completion day the lender releases the funds to your solicitor, the purchase completes and the property is yours. Your first monthly payment typically follows the month after.
Know your options
The main types of mortgage
The right product depends on whether you're buying to live in, to let, or to run as an HMO - and on how much certainty you want.
Fixed rate
Your interest rate is locked for a set term - commonly 2, 5 or 10 years. Payments stay predictable regardless of market moves, which makes budgeting simple. Early repayment charges usually apply within the fixed period.
Tracker / variable
The rate moves with the Bank of England base rate (tracker) or the lender's own rate (variable). Payments can fall as well as rise. Often more flexible on overpayments, but less predictable month to month.
Buy-to-let
Designed for rental properties and assessed mainly on projected rent rather than your salary. Typically interest-only, with a larger deposit - often around 25% or more - and rates a little higher than residential deals.
HMO / specialist
Houses in multiple occupation, student lets and multi-unit blocks usually need a specialist lender. Expect deeper underwriting, licensing checks and bigger deposits - well suited to Cardiff's strong student and professional-share market.
What lenders weigh up
The affordability factors
Before a lender commits, it builds a picture of the risk. Four things shape what you can borrow and at what rate.
Deposit & loan-to-value
The bigger your deposit, the lower the loan-to-value (LTV) and the better the rates you'll access. Residential buyers often start from 5-10%; HMO and buy-to-let usually need around 25%+ of the value upfront.
Income & affordability
Lenders apply income multiples (commonly around 4-4.5x for residential) and review your outgoings. For investment lending, the property's expected rent and rental cover ratio carry far more weight than personal salary.
Credit history
Your track record on credit cards, loans and bills shapes both approval and rate. Being on the electoral roll, avoiding missed payments and keeping balances low all help. Specialist lenders can still help with adverse history.
Lender stress tests
Lenders test whether you could still afford repayments if rates rose. For buy-to-let and HMO, rental income must usually cover the mortgage by a set margin (typically around 125-145%) at a stressed interest rate.
Be ready
Set yourself up to be approved
A little preparation makes the whole process quicker and smoother - and stronger when you come to offer.
- Get an Agreement in Principle before you offer - it shows you're a serious, funded buyer
- Gather payslips, bank statements, ID and proof of deposit early to avoid delays
- For HMO or BTL, prepare rental projections and any landlord track record
- Check your credit file and register on the electoral roll well in advance
- Use a whole-of-market adviser to reach specialist HMO and BTL lenders
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