Mortgage guide

Commercial mortgage for offices

A commercial mortgage for offices is used to purchase, refinance, or raise capital against office buildings, business centres, and professional workspace, whether let as an investment or occupied by a trading business. Office lending is assessed on both income security and market liquidity, with lender appetite heavily influenced by location, specification, and demand for the workspace type.

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Commercial mortgage for offices

A commercial mortgage for offices is used to purchase, refinance, or raise capital against office buildings, business centres, and professional workspace, whether let as an investment or occupied by a trading business. Office lending is assessed on both income security and market liquidity, with lender appetite heavily influenced by location, specification, and demand for the workspace type.

Loan-to-Value (LTV)

Office commercial mortgages are typically available at up to 70-75% loan-to-value, depending on asset quality and income profile.

  • Investment offices with strong tenants, long leases, and prime locations are more likely to achieve the upper end of LTV ranges
  • Owner-occupied offices can also attract higher leverage where the business demonstrates strong, sustainable trading

Secondary or outdated office stock is assessed more conservatively.

Affordability and Lending Assessment

Affordability assessment varies depending on use:

Investment office property is assessed on rental income using Debt Service Coverage Ratios (DSCR), with stress testing applied to interest rates.

Owner-occupied offices are assessed on the trading performance of the business, with lenders reviewing historic accounts, management figures, and cash flow projections.

Personal income is typically secondary and used only to support the overall credit profile.

Valuation Methodology

Office valuations are driven by income security and market demand:

Yield-based valuations are standard for investment assets, reflecting rental tone, lease length, and tenant covenant.

Vacant possession valuations are commonly applied for owner-occupied offices, often assuming a 90-180 day marketing period, adjusted for local demand and specification.

Valuers also consider flexibility, subdivision potential, and alternative use prospects, particularly in secondary locations.

Interest Rates and Loan Terms

Office mortgage pricing reflects both property risk and wider market trends. Pricing is influenced by:

  • Loan-to-value ratio
  • Lease security and tenant profile
  • Building specification and ESG compliance
  • Borrower experience and financial strength

Loan terms typically range from 15 to 40 years, with repayment, interest-only, or hybrid structures available depending on lender appetite.

Office Mortgage Lender Criteria

Office mortgage lenders will closely assess:

  • Location and accessibility
  • Obsolescence risk and future demand
  • Fit-out quality and energy efficiency
  • Exposure to single-tenant risk

Modern, well-located offices with flexible layouts are viewed more favourably than dated, single-use stock.

A commercial mortgage for offices offers flexible funding for both investment and owner-occupied premises, with borrowing commonly available at up to 75% LTV. Lender appetite is strongest for modern, adaptable office space in established business locations, supported by secure income or strong trading performance.

Commercial mortgage calculator

Choose owner occupier for a business buying or refinancing premises it trades from, assessed on adjusted net profit before tax from the latest accounts, or investment for property let to tenants, assessed on lease income.

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Indicative estimate only, subject to lender criteria and valuation. This is not a mortgage offer. Your property may be repossessed if you do not keep up repayments.

Commercial mortgage criteria

For context, these are the wider product terms covered by this guide. Availability and eligibility depend on your circumstances and the lender.

Commercial mortgage criteria
CriteriaDetail
Max Loan to Value (LTV)80% LTV Care Home Mortgages, 100% LTV Medical Commercial Mortgages, 75% Commercial Investment
Max TermUp to 40 years
CompletionsFrom 4 weeks
Repayment optionsCapital repayment and Interest only
Commercial mortgage ratesFrom 6.19%
Rate optionsVariable, Base Rate Tracker, 2, 3 or 5 year fixed mortgage options
Valuation methodsGoing concern/Investment (Market value 1, MV1), MV2, MV3 or bricks and mortar
Flexible LeasesRolling leases, weak covenants and short time remaining accepted
Adverse creditAccepted on some products on a case by case basis
LocationsAvailable in England, Scotland, Wales and Northern Ireland
ExperienceNot required on certain products

For context, these are the wider product terms covered by this guide. Availability and eligibility depend on your circumstances and the lender.

Commercial Investment Mortgage Rates November 2026

FeatureDetail
Max Loan to Value (LTV)65%
Product fee5% (4.74% for existing customers)
Fixed rate (5 years)6.34%
Some buy-to-let and commercial mortgages are not regulated by the Financial Conduct Authority.

About the author

Joseph Lane CeMAP is an expert commercial mortgage broker

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Frequently asked questions

What is a commercial mortgage?

A commercial mortgage is an asset-backed loan secured against commercial, semi-commercial or large-scale investment property. Lenders assess it on income sustainability and asset risk rather than personal income multiples, and pricing is set case by case, usually as a margin over Bank Rate.

What deposit does a commercial mortgage need?

On the cases we arrange, investment property typically needs a deposit of 25% to 40%. Owner-occupied retail lending can reach 80% loan-to-value, and on medical, dental and pharmacy transactions we currently see a number of options at up to 100% of an MV3 valuation, so no deposit may be needed on the right case. That reflects our experience of the current market, not a standard lender rule.

How much can I borrow on a commercial mortgage?

The lower of two caps. The first is affordability: in our experience investment property needs stressed rental coverage of 125% to 145%, and an owner-occupier's business EBITDA must cover the repayments 1.25 to 2 times. The second is loan-to-value, which in our experience runs at 60% to 75% for most sectors.

Can I get an interest-only commercial mortgage?

Yes, selectively. In our experience interest-only commercial lending typically goes up to 75% loan-to-value, through specialist and challenger lenders, where the income comfortably covers the debt and the exit is credible. High-street lenders generally require capital repayment.

How is commercial mortgage affordability stress-tested?

For investment property, on the cases we arrange the rent must cover 125% of the interest at a stressed rate, rising to 145% for higher-rate taxpayers or weaker leases. As an illustration, with interest modelled at a 5% stress rate, 125% cover means the rent must support interest at an effective 6.25%, and 145% cover at 7.25%. The stress rate is the lender's own assessment rate, which can differ from the product's pay rate and depends on the lender and the product, so an adviser checks the lender's current assessment rate. Owner-occupied property is tested on the business's profit instead.

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