The complete guide to commercial investment mortgages

• A commercial investment mortgage is used to buy property for rental income or portfolio growth, rather than for your own business use. It's a core tool for professional property investors.

• These mortgages differ from owner-occupied commercial mortgages, with stricter lending criteria like more demanding minimum LTV and a stronger focus on provable rental income and investment returns.

• There are multiple product structures available, including fixed, variable, interest-only, and bridging options, each suited to different cashflow strategies and risk appetites.

• Upfront costs and eligibility requirements are significant, with deposits typically starting at 25% and lenders assessing creditworthiness, income, and property viability in detail.

• Investors must carefully manage key risks, including market fluctuations, tenant vacancy, regulatory changes, and ongoing maintenance costs, all of which can impact returns.

As an investment option, commercial property can offer attractive returns and add some much-needed diversity to your portfolio.

There are risks and costs involved, of course, but the merits of investing in commercial property can be underreported.

This article explains the basics of commercial investment mortgages (or commercial buy-to-lets), how they can be used and by whom and the pros and cons involved. By the time you finish reading, you should have a lot more knowledge and purpose when it comes to commercial property.

What is a commercial investment mortgage?

A commercial investment mortgage is a way of borrowing money to buy a commercial property that you intend to lease out.

Although not exactly the same, you can make a comparison with buy-to-let mortgages for residential properties. In fact, you'll sometimes see them referred to as commercial buy-to-let.

You can also use a commercial investment mortgage to release cash from your existing portfolio of properties. In this instance, you could roughly compare it to remortgaging a residential property.

Differences between commercial mortgages and commercial investment mortgages

Commercial mortgages generally take one of two forms – investment or owner-occupied. There are differences in their purpose and structure that are worth understanding before we go any further.

Owner-occupied commercial mortgages

• Are used by businesses to buy their own premises

• The property is used to support the trading activities and growth of a business

A comparison with residential property works here, too: an owner-occupied mortgage is equivalent to the one you use to buy your primary residence.

Commercial investment mortgages

• Are used by businesses to start or extend a property portfolio

• The property is owned as an investment, so is used to build equity and generate returns

Each lender will have its own eligibility and qualification criteria.

Semi-commercial mortgages

These mortgages apply to mixed-use properties – e.g. a shop with a residential flat above it. They’re sometimes called “mixed-use mortgages” and are available as owner-occupied or investment mortgages, provided certain criteria are met relating to income distribution and floor space.

Properties like this aren’t especially common, but if you do find one and apply for a mortgage on it, you can expect:

• Lower rates than a purely commercial property

• Floorspace requirements (e.g. 50-80% of floorspace is residential)

• Income requirements (the majority of income generated from the property being from trading activities rather than rent)

We’ve explained how investment mortgages are one subcategory of commercial mortgages. To get more granular, there are many subcategories within this subcategory.

We’ll run through them below and, where any specific examples are needed, we’ll reference our approach at Allica Bank. Sometimes, you need to see it in cold hard numbers to really understand.

Fixed rate mortgages

A fixed rate mortgage charges you the same interest rate for a set period of time.

Using Allica as an example, our five-year fixed commercial investment mortgage (for a LTV up to 65%) has a rate of 7.90% in May 2026.

A fixed rate mortgage can work in your favour if you need certainty over cashflow and repayments, particularly if your income is fixed.

Variable rate mortgages

A variable rate mortgage charges you a changeable interest rate. Your rate could start at 9.00% and then move to 9.50%, for example, in line with changes to your lender’s standard variable rate.

The rate can go up or down, which means your repayments will follow suit. If rates are falling, you’ll benefit. If they rise, you’ll have to pay the extra.

Interest-only mortgages

With an interest-only mortgage, for a set period of time, you only repay the interest you accrue and not the balance of the loan. At the end of the loan, you have to repay the balance in full.

These mortgages can be useful if you need to keep your monthly repayments low, free up more of your monthly income, or if you have a specific plan to repay at the end of the loan.

The lower repayments are attractive, but you need to know you can repay the loan when it’s due. If not, the bank can repossess your property.

Balloon payment mortgages

Balloon payments are used in lots of loans, including asset finance. Applied to commercial investment mortgages, a balloon payment doesn’t change much from a normal variable or fixed rate mortgage – except at the end.

With a balloon payment, you make monthly repayments, followed by a significantly larger final repayment.

You can expect to pay a balloon payment on a partially amortising mortgage – one of the products we offer at Allica Bank.

The benefit is that your monthly repayments will be lower than with a traditional commercial mortgage. The challenge is that you need to have the extra cash ready to repay the loan in that final payment.

Bridging loans

Bridging finance isn’t exclusive to property, but it's commonly used for these transactions.

A bridging loan provides a bridge (hence the name) between your financial position today and your financial position in a year or two. These are short-term loans (often repaid in 12 months) that fill a gap in your cashflow.

They can be arranged quickly (certainly faster than a mortgage), which makes them useful for acting on unexpected opportunities or unique situations. Rates on bridging loans tend to be higher than most mortgages.

The risks associated with commercial investment mortgages

What do you need to qualify for a commercial investment mortgage in the UK?

Investment mortgages aren’t handed out to anybody who applies; lenders have vigorous processes to follow and requirements they expect you to meet.

To qualify for a commercial investment mortgage, you’ll need to provide several pieces of evidence and follow a few mandatory processes.

1. Credit requirements

Whenever any entity applies to borrow money, it will face a credit check. Lenders will want to check your business’ creditworthiness, as well as having assurances about the directors and their financial history.

If you or your business have a history of late payments or insolvency, you might not be successful in your application.

2. Down payment

To secure a commercial investment mortgage, you’ll need to have a deposit ready. Most lenders will ask for a minimum deposit of 25% (a 75% LTV).

Without enough money saved for the deposit – and proof of it – you’ll not be able to take out a mortgage.

3. Debt service cover ratio (DSCR)

Your lender will want to know you can afford the repayments on your mortgage. They assess this by calculating your DSCR – in its simplest form, this means dividing your net operating income by your total debts.

They’ll want to see that you can afford to make repayments at a higher rate than your actual repayments, to account for an increase in rates and other volatility.

4. Property appraisal and valuation

Before a lender agrees to mortgage a property, they’ll need to know you and they are making a sensible investment.

Buying a property for £100,000 more than its fair market value puts you and the lender at risk of losing money. An appraisal and valuation will check it’s in good repair and being sold at a reasonable price, considering its condition, other properties on the market and any other risks identified.

Steps to secure a commercial investment mortgage

If you decide to apply for a commercial mortgage, every lender will have a clear process for you to follow from start-to-finish. It might vary a bit between lenders, but the general structure will be similar across the market.

You can expect to go through the following steps to get a commercial mortgage.

1. Finding your property

There’s no mortgage without a property, so one of the first things you’ll need to do is find a property you’d like to buy. You can work with commercial agents or do your own desk research to understand what’s available.

You’ll need to work out your budget (either total or in price per square foot – a common metric used in commercial property sales), target yield and other criteria.

2. Prequalification or getting a decision in principle (DIP)

Applying for a DIP is all about making sure you’ve got the basics in place to move ahead with an application. The lender will want to check you meet all their standard criteria and assess what you can afford to borrow.

You can go through prequalification with one lender and choose another one to actually borrow money from.

To get a DIP from Allica Bank, you’ll need to share:

• Your company details

• Personal details of the applicant(s)

• The address, estimated value, age, freehold/leasehold status and type of the property

• Details of the tenant and their lease terms (if occupied)

• Product details (the term, structure and repayment profile)

• Your affordability (turnover, EBITDA, rent)

• Details of any other income sources

3. Finding a lender

You can apply for a loan with the lender you used for prequalification, or you can look elsewhere in the market.

Interest rates tend to play a big part in most investors’ minds, but you’ll also want to consider other factors like customer service, loan length, repayment terms and penalties.

4. Submitting a loan application

Once you’ve chosen your lender, you’ll need to submit your application. If you’re applying to Allica Bank, you’ll be able to talk to a real, helpful human if you get stuck. Not every lender offers such close support, though.

For an Allica application, you’ll need to evidence:

• The last two years of financial accounts

• Full tax returns of ultimate beneficial owners/applicants

• Bank statements for the last three months (personal and business)

• A proposal summary, which must include: tenant performance over the last 12 months, background experience of the directors and a brief description of the security property.

• A property schedule

• Assets, Liabilities, Income and Expense (ALIE) report

• Nominated bank account details

• Amount and source of deposit contribution

6. Underwriting and approval

Once you’ve submitted your application, it’ll go to the lender’s underwriting team to decide whether they can approve the buy-to-let loan.

You might be asked to submit more information or provide added context to some of the evidence submitted in your application.

Your lender will also need to conduct a valuation, searches and other checks, as well as jumping through the many legal hoops that the system demands.

7. Closing the deal

If you get approved for the mortgage, you’ve then got to complete the transaction. After approvals and final checks, you’ll enter the drawdown period – the funds will be exchanged and you can collect your keys.

From more information discover how to get a commercial mortgage here.

Why should I use Allica for my commercial mortgage?

You have a lot of lenders to choose from, including Allica Bank. While we’ve got you here, it’d be silly not to let you know about our commercial mortgages and why so many established businesses choose Allica.

• Dedicated relationship manager (unless you were introduced by a broker)

• 75% maximum LTV for commercial investment mortgages

• Quick decisions – always decided by humans, never by a computer

• Easy-to-understand product guides, fees and tariffs and communication

Learn more about Allica’s commercial mortgages

Links were live and information was correct at the time of writing the article.