Buying your business premises is one of the most significant financial decisions you will make as a business owner. A commercial mortgage can make it possible, but the lending criteria are meaningfully different from residential mortgages, and walking in unprepared costs time, money, and sometimes the deal itself.
This guide explains what commercial mortgage lenders genuinely focus on, what you can do to strengthen your application, and where the common pitfalls lie.
What Is a Commercial Mortgage?
A commercial mortgage is a loan secured against a property that is used for business purposes. That can include premises you intend to occupy yourself (an owner-occupier mortgage) or property you are buying as an investment to let to other businesses (commercial investment mortgages).
The distinction matters because lenders assess them differently. Owner-occupier deals are underwritten partly on the strength of your trading business. Investment deals are assessed primarily on the rental income the property generates relative to the mortgage payments, known as the interest coverage ratio (ICR).
How Much Can You Borrow?
Most commercial mortgage lenders will lend up to 70 to 75 per cent of the property's value, meaning you will typically need a deposit of 25 to 30 per cent. Some lenders go to 80 per cent for strong applications, but this is less common and usually comes with tighter criteria or a higher rate.
The maximum loan is also shaped by affordability. For owner-occupiers, lenders want to see that the business generates enough profit to comfortably cover repayments. For investment properties, the rental income usually needs to cover 125 to 135 per cent of the interest payment at a stressed rate.
What Lenders Actually Scrutinise
This is where many applicants are caught off guard. Commercial mortgage underwriting is far more manual and judgement-based than residential lending. Here is what lenders will dig into:
Trading history and accounts
Most lenders want to see at least two to three years of filed accounts. They will look at turnover, net profit, and trends over time. A business that is growing steadily is more reassuring than one with volatile or declining revenues, even if the most recent year looks healthy.
Debt service coverage
Lenders calculate whether your business profit, after tax and drawings, is sufficient to cover the proposed mortgage payments with a reasonable buffer. A debt service coverage ratio (DSCR) of 1.25 or above is a common benchmark, though this varies by lender.
The property itself
Not all properties are equally financeable. Standard commercial property such as offices, light industrial units, and retail premises is generally straightforward. Specialist properties, including care homes, hotels, petrol stations, and places of worship, are considered higher risk and attract a smaller pool of willing lenders.
Your personal financial position
Most commercial mortgages, particularly for smaller businesses, require a personal guarantee from the directors or principal shareholders. Lenders will check personal credit history and may assess personal assets, especially if the business is relatively young.
Lease terms (for investment properties)
If you are buying a tenanted investment property, the strength of the tenant covenant and the length of the lease remaining are critical. A property let on a long lease to a strong national tenant is viewed very differently from one with a short lease and a single local occupier.
Owner-Occupier vs Investment: Key Differences at a Glance
- Owner-occupier: assessed on business profitability and trading performance
- Investment: assessed on rental yield, ICR, tenant quality, and lease length
- Owner-occupier: you may need to demonstrate the business can survive a rate rise
- Investment: stress testing is typically applied to the rental income calculation
- Both: personal guarantees are common for SME borrowers
Typical Rates and Terms
Commercial mortgage rates are quoted either as a fixed rate or a variable rate linked to the Bank of England base rate or SONIA (the Sterling Overnight Index Average). Fixed periods of two to five years are common, after which the loan typically reverts to a variable rate.
Rates vary considerably depending on the loan-to-value ratio, property type, borrower profile, and which lender you approach. The spread between the most competitive and least competitive offers in the market can easily be one to two percentage points, which across a large loan and a long term adds up to a very significant sum.
This is one area where comparing offers from multiple lenders before committing makes a tangible difference. Lenders price commercial mortgages differently based on their own appetite for certain sectors and property types, so a deal that one lender prices expensively may be attractive to another.
Common Reasons Applications Stall or Fail
- Accounts that show low profitability due to aggressive tax planning (lenders lend on declared profit)
- A property that lenders categorise as specialist or unusual use
- Director credit issues that were not disclosed upfront
- Surveys that reveal structural problems or environmental concerns
- Insufficient deposit or inability to evidence the source of funds
- Businesses that are too young, typically under two years of trading
Being aware of these ahead of time gives you the opportunity to address them or choose a lender whose criteria are better suited to your circumstances.
What You Can Do to Strengthen Your Application
Getting your documentation in order before you approach lenders saves significant time. Prepare your last two to three years of full accounts, your most recent management accounts if available, details of any existing borrowing, and a clear explanation of the business and how the property fits into your plans.
If your accounts show low profit for tax reasons, be prepared for a conversation about that. Some lenders will consider add-backs for certain non-cash items, but this needs to be handled carefully and honestly.
Choose the right lender for your property type and situation rather than defaulting to your existing bank. High street banks have their place, but challenger banks, specialist commercial lenders, and regional building societies often have more flexible criteria for the right deal.
Final Takeaway
A commercial mortgage is a long-term commitment with meaningful financial consequences, so the preparation you do upfront pays dividends. Understanding what lenders look at, getting your finances in order, and comparing offers from a range of lenders rather than accepting the first terms you receive gives you the best chance of securing finance that genuinely works for your business.
