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Finance3 minute readAuthor: Баси Имота teamPublished: 21 June 2026

Mortgage when buying property: steps, risks and checks

How a mortgage works when buying property: approval in principle, deposit, valuation, APR, contract, security and timing before completion.

Short answer

The safest approach is to check your budget, the documents, the exact location and the property's condition before deciding. This article covers practical criteria that help you compare offers more objectively and avoid rushed decisions.

Key takeaways

  • Check the price against similar active offers in the same area.
  • Compare the documents, condition and terms before a viewing or deposit.
  • Use filters and saved searches to track new opportunities.

Practical steps

  1. Set a budget and define the essential property criteria.
  2. Open several comparable offers and check the price per square metre.
  3. Seek specialist help where there is legal or financial risk.

Key terms

Market value
A realistic property price based on location, floor area, condition and current demand.
Comparable offer
A similar property in a nearby area that helps you assess whether the price is reasonable.
Table of quick checks before a property decision
CheckWhy it matters
PriceShows whether the offer is competitive for the area.
DocumentsReduces the risk of encumbrances, disputes or delays.
LocationAffects convenience, liquidity and future value.

A mortgage makes a purchase possible for many people, but adds another party to the transaction: the bank. This means more checks, deadlines and documents. A serious mistake is to choose a property and pay a deposit before discovering that the bank will not finance the required amount or that its valuation is lower than expected. Plan the mortgage before actively searching.

Start with approval in principle

Approval in principle gives an indication of the loan you may receive based on income, liabilities and your financial profile. It is not a final promise because the bank will later assess the specific property, but it provides a clear budget.

Ask the bank or mortgage adviser for the full cost rather than only the monthly payment: interest, fees, insurance, valuation, notary costs, mortgage registration and annual percentage rate. This lets you compare offers by total cost instead of the initial advertised rate. You can estimate a monthly payment with the mortgage calculator.

Important advice

Compare several offers and request the terms in writing. A small difference can have a large effect over a long mortgage term.

Deposit and cost reserve

The bank generally does not finance every transaction cost. In addition to your deposit, allow for the notary, local tax, registration fee, valuation, insurance, possible agency commission and moving. These items are covered in detail in the guide to hidden costs when buying property.

Do not commit your last savings to the initial contribution. Repairs, furniture, appliances or a temporary fall in income often follow a purchase. A reserve reduces the risk of beginning home ownership under financial pressure.

Property valuation and the risk of a price gap

Practical next step

View current flats in Sofia

Compare current offers by area, property type and price to apply the advice straight away.

The bank commissions or accepts a property valuation. If it is below the agreed price, the bank may finance a smaller amount. The buyer must cover the difference or negotiate a new price. This is one reason not to pay a large deposit before confirming that the mortgage and valuation are realistic.

Compare an offer with similar properties in the area and review how a property's market price is determined. A price substantially above the market increases the risk of a lower valuation.

How to protect the deposit

If the purchase depends on financing, the preliminary agreement should state this. Discuss with a solicitor whether it should include a refused-financing clause, a deadline for bank approval and a clear process for the deposit.

Deadlines matter. The bank must check income, the property, documents, valuation and encumbrances. If the agreement requires completion too quickly, you may breach it through no genuine fault of your own.

Documents the bank will request

The list depends on the bank and buyer, but commonly includes identity documents, income evidence, details of other loans, property documents, the valuation and a draft agreement. Many of the documents in the property-purchase document checklist will be required, including an encumbrance check.

If the seller cannot supply documents on time, the bank may delay or refuse financing. The seller's preparedness is therefore part of the quality of the offer.

Final advice

A mortgage is not simply a question of whether you can borrow money. Consider whether you can service it comfortably if income or expenses change. When searching property for sale in Sofia, filter by your real budget after all costs, not the maximum amount a bank might lend.

Ready for the next step?

Apply this advice directly to specific offers and compare options according to your budget and goals.