Securing a Commercial Mortgage Best Guide 2025

Commercial mortgages are a fundamental part of the UK property landscape, enabling businesses to purchase their own premises, investors to acquire commercial assets, and developers to fund projects. Yet despite their importance, commercial mortgages are often poorly understood — the market is more complex, less transparent, and far more varied than the residential mortgage market most people are familiar with.

In this comprehensive guide, we cover everything you need to know about commercial mortgages in the UK, from the basic principles and different types available to the application process, costs, and how to find the best deal for your circumstances.

What Is a Commercial Mortgage?

A commercial mortgage is a loan secured against a non-residential property. This includes offices, retail units, warehouses, factories, pubs, hotels, care homes, and any other property used for business purposes. Some lenders also offer commercial mortgages for mixed-use or semi-commercial properties — those that combine residential and commercial elements, such as a flat above a shop.

Commercial mortgages work on a similar principle to residential mortgages: a lender provides funding to purchase or refinance a property, and that property acts as security for the loan. However, there are several key differences:

• Higher deposits — commercial mortgages typically require deposits of 25% to 40%, compared to as little as 5% for residential purchases
• Higher interest rates — rates are generally 1% to 3% above equivalent residential products
• Shorter terms — while residential mortgages commonly run for 25 to 35 years, commercial mortgage terms are usually 5 to 25 years
• More complex assessment — lenders evaluate the business viability, property type, and income generation potential alongside your personal financial position
• Less regulation — most commercial mortgages are not regulated by the FCA, which means less consumer protection but also more flexibility in lending criteria

Types of Commercial Mortgage

The commercial mortgage market offers a range of products designed for different purposes and property types.

Owner-occupier commercial mortgages are for businesses that want to buy the premises they trade from. This is often a smart long-term strategy — instead of paying rent to a landlord, you build equity in an asset. Monthly mortgage payments may be comparable to or even lower than rent, and you benefit from any future increase in the property’s value. Owner-occupier mortgages are available for all types of business premises, from offices and workshops to retail units and restaurants.

Commercial investment mortgages are for individuals or companies buying commercial property as an investment — to let out to business tenants. These work similarly to buy-to-let mortgages but for commercial rather than residential property. The rental income from the tenant is the primary basis for the lender’s affordability assessment.

Semi-commercial mortgages cover properties with both commercial and residential elements. A common example is a shop with a flat above, or a pub with owner’s accommodation. These products sit between fully commercial and fully residential mortgages and can offer advantages from both, including potentially lower stamp duty through mixed-use classification. Read our detailed guide on semi-commercial mortgages for more information.

Bridging loans provide short-term funding for commercial property purchases where speed is essential — for example, auction purchases or time-sensitive opportunities. Bridging finance is typically arranged within days rather than weeks but comes with higher costs. Our guide to bridging loans covers this in detail.

Development finance is specialist funding for property development projects, including new builds, conversions, and major refurbishments. Funds are released in stages as the project progresses. For more on this, see our guide to development finance.

How Much Can You Borrow?

The amount you can borrow with a commercial mortgage depends on several factors, and lenders assess applications differently from residential mortgages.

Loan-to-value (LTV) — most commercial lenders offer a maximum LTV of 70% to 75%, meaning you need a deposit of at least 25% to 30% of the property value. Some specialist lenders may go up to 80% for strong applications, while others may be more conservative and cap at 60% to 65% for higher-risk property types.

Affordability assessment — for owner-occupier mortgages, lenders assess the profitability of your business through your accounts, typically requiring at least two to three years of trading history. They want to see that the business generates sufficient profit to cover the mortgage payments with a comfortable margin, usually expressed as a debt service coverage ratio (DSCR) of at least 1.25x to 1.5x.

For investment mortgages, the assessment focuses on the rental income from the property. Lenders typically require the annual rent to be at least 125% to 150% of the annual mortgage interest, calculated at a stress rate higher than the actual pay rate.

Business plan — if your business is relatively new or you are buying a property for a new venture, lenders will place more weight on your business plan and financial projections. A well-prepared plan with realistic assumptions can make the difference between approval and decline.

Use our mortgage calculator to get an initial estimate of monthly repayments, and our affordability calculator to understand how much you might be able to borrow.

Interest Rates and Fees

Commercial mortgage interest rates vary significantly depending on the lender, property type, LTV ratio, and the strength of the application. As a general guide:

• Fixed rates typically range from 4% to 8% for terms of two to five years
• Variable rates are usually set at a margin above the Bank of England base rate or SONIA (Sterling Overnight Index Average), typically 2% to 4% above
• Specialist or higher-risk lending may carry rates of 7% to 12% or more

It is worth noting that commercial mortgage rates are less standardised than residential rates. Each application is assessed individually, and the rate you are offered is often a reflection of the perceived risk. Strong applications with low LTV, established businesses, and prime properties will attract the most competitive rates.

Arrangement fees are a standard part of commercial mortgages and typically range from 1% to 2% of the loan amount. On a £500,000 mortgage, this could mean a fee of £5,000 to £10,000. Some lenders charge a flat fee instead.

Valuation fees for commercial properties are higher than residential valuations because they involve a more detailed assessment of the property’s condition, use, and income-generating potential. Expect to pay between £1,000 and £5,000 or more, depending on the property’s value and complexity.

Legal fees cover the lender’s solicitor costs and your own solicitor’s work. Commercial property transactions tend to be more complex than residential ones, so legal fees are usually higher — typically £2,000 to £5,000 or more.

Broker fees — if you use a mortgage broker (which is strongly recommended for commercial mortgages), there may be a broker fee. At Option Finance, we are transparent about our fees and always discuss costs upfront.

The Application Process

Applying for a commercial mortgage is more involved than a residential mortgage application. Here is what to expect at each stage.

Initial consultation — the first step is to discuss your requirements with a specialist broker. At Option Finance, we start by understanding your business, the property you want to buy, your financial position, and your long-term plans. This allows us to identify the most suitable lenders and products.

Documentation — commercial mortgage applications require substantial documentation. You should be prepared to provide:

• Personal identification and proof of address
• Business accounts for the last two to three years (audited or management accounts)
• Business bank statements (typically six to twelve months)
• A business plan with financial projections (particularly for new ventures)
• Details of the property, including any existing tenancy agreements
• Asset and liability statement
• Details of any existing borrowings
• Evidence of your deposit and its source

If you are self-employed, your SA302 tax calculations and tax year overviews will also be required.

Agreement in principle — your broker will approach suitable lenders to establish how much they are prepared to lend and on what terms. This gives you confidence to proceed with your property search or negotiate the purchase.

Property valuation — once you have identified a property, the lender will instruct a specialist commercial surveyor to carry out a full valuation. This assessment considers the property’s condition, its suitability for the intended use, comparable transactions in the area, and its income-generating potential. The valuation is critical — if the surveyor values the property below the purchase price, the lender may reduce the loan amount.

Underwriting and approval — the lender’s underwriting team reviews the full application, including the valuation report, your financial documentation, and any other due diligence. They may request additional information or clarification during this stage.

Mortgage offer — if the application is approved, the lender issues a formal mortgage offer. This sets out the terms of the loan, including the interest rate, term, fees, and any conditions.

Legal work and completion — your solicitor handles the legal aspects of the purchase, including property searches, contract review, and exchange. On completion day, the lender releases the funds and you take ownership of the property.

The entire process typically takes six to twelve weeks from initial application to completion, though complex cases or properties with issues can take longer.

Eligibility and Ownership Structures

Eligibility for a commercial mortgage depends on a combination of factors. Most mainstream lenders require a minimum of two to three years of trading history, demonstrated through audited or management accounts. The business must show sufficient profitability to service the mortgage debt, and lenders apply stress tests to ensure affordability at higher interest rates. Both personal and business credit histories are reviewed, and some property types (pubs, hotels, care homes) require lenders with specific sector expertise.

Many business owners purchase commercial property through a limited company rather than in their personal name. Advantages include tax efficiency (mortgage interest is fully deductible as a business expense before corporation tax), asset protection, and easier succession planning. However, company ownership involves additional costs, including formation, maintenance, and accountancy fees. It is essential to take professional tax advice before deciding on the ownership structure.

Why Use Option Finance for Your Commercial Mortgage?

If you already own commercial property with a mortgage, remortgaging can save you thousands when your existing deal ends, release equity for expansion, or secure better terms as your business grows. A commercial second charge mortgage is another option for raising additional capital without disturbing your existing first charge.

The commercial mortgage market is fragmented and complex, with hundreds of lenders offering different products, criteria, and rates. Many of the best deals are not available directly — they are only accessible through specialist brokers with established lender relationships. Common mistakes we see include underestimating costs (use our stamp duty calculator to estimate one of the largest additional costs), inadequate documentation, ignoring the exit strategy, and choosing the wrong ownership structure — all of which professional guidance helps you avoid.

At Option Finance, our commercial mortgage advisers have extensive experience across all types of commercial property, from standard office and retail purchases to specialist sectors like hospitality, healthcare, and development. We work with a wide panel of lenders, including high street banks, specialist commercial lenders, and private funders, to find the most competitive terms for your specific situation.

We handle every aspect of the application process, from initial assessment and documentation preparation to lender negotiation and completion support. Our goal is to make commercial property finance as straightforward as possible, so you can focus on running your business.

Get Started Today

Whether you are buying your first commercial property, expanding your portfolio, refinancing an existing mortgage, or exploring specialist options like development finance or bridging loans, we are here to help.

Apply now to speak with one of our commercial mortgage specialists. We will review your requirements, explain your options, and guide you through every step of the process.