How to Get a Commercial Mortgage for Office Space

What is a commercial mortgage for office space?

A commercial mortgage for office space is a secured loan where the office building itself is taken as security by way of a first legal charge. If you default on repayments, the lender has the right to recover their funds by selling the property. These loans cover single offices, whole office buildings, serviced office suites, or floors within mixed-use blocks. They are not regulated by the FCA in the same way as residential mortgages, and underwriting is more individually assessed.

There are two main purposes for office mortgages, and lenders treat them very differently.

Type	Who it is for	How affordability is assessed
Owner-occupied office mortgage	Trading businesses using the space for their own operations	Based on business profits, cash flow, and trading accounts
Investment office mortgage	Landlords letting offices to tenants on commercial leases	Based on passing rent, lease quality, and tenant covenant strength

Who can get a commercial mortgage for office space?

Most trading businesses and property investors can potentially obtain a commercial mortgage for UK office space, provided they meet deposit, affordability, and credit criteria. Borrower types that successfully secure office mortgages include limited companies purchasing premises for their own use, LLPs and partnerships, sole traders with established businesses, SPVs set up specifically to own an office building, and experienced property investors building commercial portfolios.

Lenders are currently more cautious around secondary offices in weaker locations. Hybrid working trends have increased vacancy risk in some areas. However, lenders remain actively lending on quality, well-located buildings in cities including London, Manchester, Birmingham, Leeds, Bristol, Edinburgh, and Cardiff. The key is matching your application to the right lender: high street banks, challenger banks, and specialist commercial lenders each have distinct appetite.

Main commercial mortgage options for office space

Owner-occupied commercial mortgages are designed for business owners buying premises their company will use. Terms typically run 10 to 25 years. Affordability is assessed mainly against business accounts and demonstrated profits. Owning rather than renting removes the risk of rent increases and lease expiry, and allows the business to build equity in an asset.

Investment office mortgages are for buyers letting offices to tenants on commercial leases. Lenders assess affordability on the passing rent and lease quality, looking for lease lengths of five to ten years, ideally on full repairing and insuring terms, strong tenant covenants, and realistic market rents that can sustain debt service.

Structure	How it works	Best suited for
Capital and interest	Reduces the loan balance each month	Business owners wanting to own the property outright at term end
Interest-only	Pay interest only; capital repaid at term end	Investors maximising cashflow, with a clear exit or refinance strategy
Part-and-part	Mix of capital repayment and interest-only	Flexibility during early years of ownership

Variable vs fixed rate. Variable rate loans are typically priced as a margin over the Bank of England base rate, which stood at 3.75% in early 2026 following reductions through 2024 and 2025. Fixed rate loans are priced off swap rates and provide budgeting certainty for two to ten years. Fixed products are popular with business owners who want predictable occupancy costs. Some lenders also offer semi-commercial products if the office building includes residential elements above or below.

What deposit and LTV do commercial office mortgage lenders require?

For pure office space, most commercial mortgage lenders cap loan-to-value at around 65 to 75%, requiring a deposit or equity contribution of 25 to 35%. As a worked example: on a £600,000 office in Birmingham, a 70% LTV mortgage would be £420,000, requiring a £180,000 deposit plus acquisition costs. Property quality affects available LTV: lenders may stretch higher on prime city-centre offices with strong tenants, while secondary locations may see LTV capped at 60 to 65%.

Affordability for owner-occupiers. Lenders typically require at least two years of trading accounts showing consistent profits, up-to-date management figures if accounts are more than six months old, and evidence that profits cover mortgage repayments with headroom, usually stress-tested at two to three percent above the current headline rate.

Affordability for investment offices. Lenders focus on the interest cover ratio: rent typically needs to be 125 to 160% of stressed annual interest. They will examine lease length, tenant covenant strength, and vacancy risk, and will want comparable evidence supporting the market rent assumptions.

Credit expectations. Lenders expect no recent unpaid CCJs or serious arrears, and a clean credit profile or a clear explanation for any historic issues. Some specialist lenders will consider ex-CVA or ex-administration cases where there is a strong recovery story and the current trading position is solid.

Step-by-step: how to get a commercial mortgage for office space

Step 1: Assess your position. Before viewing offices, review your company accounts, management figures, existing debts, and available deposit. Understanding your financial position upfront prevents wasted time on properties outside your realistic budget.

Step 2: Speak to a specialist broker. Engaging us at this stage helps you gauge likely loan size, headline rates, and achievable LTV for the type of office and location you are considering. Potential issues can be flagged before they become problems, and the right lender type can be identified before you make an offer.

Step 3: Define your budget. Work out what monthly payment would be affordable for your business. Back-solve an approximate maximum purchase price using realistic interest rate assumptions rather than the lowest advertised rate.

Step 4: Obtain a decision in principle. A DIP from a lender strengthens your negotiating position. Vendors and agents in competitive markets like London or Manchester often request this before accepting offers.

Step 5: Make your offer. Once you have identified a suitable office, make an offer through the commercial agent, typically subject to valuation and finance, accompanied by proof of funds and your DIP.

Step 6: Submit your full application. Key documentation includes two to three years of filed or certified accounts, recent bank statements, ID and proof of address for directors, details of existing borrowing, full property details including leases for multi-let offices, and a business plan or projections if the office move will materially change your overhead structure.

Step 7: Underwriting and valuation. The lender instructs a RICS commercial valuation. Underwriters review your financials and may request further information on tenants, service charges, planning permissions, and building condition.

Step 8: Receive your formal offer. Once approved, the lender issues a formal mortgage offer setting out rate, term, fees, covenants, and conditions precedent to drawdown. Review this carefully with your solicitor before proceeding.

Step 9: Complete the legals. Solicitors act for both buyer and lender, handling title checks, searches, and lease review. After exchange, completion follows: the mortgage funds are drawn and ownership transfers to you.

Using bridging finance to secure office space quickly

Standard commercial mortgage timescales of eight to twelve weeks do not always fit the deal. A commercial bridging loan can fund an office purchase within days or a few weeks, typically for three to eighteen months, while longer-term finance is arranged or refurbishment works are completed.

Common scenarios where bridging is the right first step include buying an office at auction on a 28-day completion deadline, acquiring vacant or part-derelict offices that are not yet mortgageable, acting quickly on a discounted off-market deal, or funding purchases where the seller will not wait for standard mortgage timescales.

Bridging usually carries higher monthly interest and arrangement fees than a term mortgage and should always be used with a clear exit strategy: either refinancing to a term commercial mortgage or selling the property. We can structure combined solutions, lining up both the initial bridging loan and the eventual commercial mortgage with compatible lenders, giving you certainty on your exit from day one.

Costs to budget for when buying office space with a mortgage

Stamp Duty Land Tax. Commercial SDLT rates apply to office purchases in England and Northern Ireland. Scotland uses Land and Buildings Transaction Tax; Wales uses Land Transaction Tax. For a £750,000 office purchase in England:

Band	Rate	Tax
Up to £150,000	0%	£0
£150,001 to £250,000	2%	£2,000
£250,001 to £750,000	5%	£25,000
Total SDLT		£27,000

Lender fees. Expect an arrangement fee of 1 to 2% of the loan, a commercial RICS valuation of £1,500 to £5,000 or more depending on property size, and in some cases commitment or non-utilisation fees if funds are not drawn promptly.

Legal costs. Budget for buyer's solicitor fees, lender's legal fees (usually payable by the borrower), Companies House charges for registering the legal charge, and additional work for complex office titles or lease reviews.

Ongoing property costs. Business rates based on the rateable value, building insurance as required by the lender, service charges and ground rent in multi-let blocks, and maintenance reserves all affect long-term affordability and should be factored into your initial budget.

Common challenges when financing office space in 2026

Post-pandemic market concerns. Hybrid working has changed how businesses use offices. Lenders worry about shorter lease lengths becoming the norm, increased void periods in secondary locations, and tenant demand concentrating in prime, well-amenitised buildings. Without careful presentation, these concerns can lead to declined applications or overly conservative terms. The right lender selection matters as much as the application itself.

Multi-let and serviced office complexities. Multi-let offices with several tenants spread risk but can appear more volatile to lenders. Serviced offices and co-working spaces often operate on licences rather than formal leases, which some lenders treat cautiously. There are specialist lenders who understand this sector; finding them requires access to the right panel.

Older stock and EPC requirements. Offices requiring EPC upgrades or significant refurbishment face lending restrictions. Lenders may want a detailed capital expenditure schedule and may limit LTV until improvement works are completed. Where works are needed, a bridging facility used to purchase and refurbish before refinancing onto a term mortgage is often the most practical route.

How commercial mortgage rates for offices are set

Variable rate commercial mortgages are typically priced as base rate plus a margin. With the base rate at 3.75% in early 2026 and typical margins of 1.5 to 3.5% on office lending, headline variable rates run from approximately 5 to 7% for good-quality assets with strong borrowers. Fixed rate products are priced off swap rates, which reflect market expectations for future rate movements.

Higher LTV borrowing attracts higher rates and fees. Borrowing 75% of property value represents more risk to the lender than 60%, so pricing reflects that. Security quality also matters: modern, well-located offices with strong tenants typically achieve better terms than older, functionally obsolete space. Lenders assess location and transport links, building condition and EPC rating, tenant quality and lease length, and alternative use potential when pricing a facility. Your financial track record as a borrower influences pricing further: an established trading company with consistent profitable accounts will typically secure more competitive terms than a new SPV.

How long does it take to get a commercial mortgage for office space?

Straightforward owner-occupied or single-let office mortgages with mainstream lenders typically complete in eight to twelve weeks from offer acceptance, assuming prompt document submission and no major legal complications. More complex transactions, including multi-let offices with numerous tenants, complicated titles, or portfolio refinances, can take three to six months.

Common bottlenecks include valuation appointment availability, missing or incomplete financial information, legal enquiries around rights of way, service charge disputes, or fire safety, and lender credit committee backlogs. Preparing your document pack before making an offer, rather than after, is the single most effective way to shorten the timeline.

Documents you will need for a commercial office mortgage application

For directors and partners: photo ID (passport or driving licence), proof of address within the last three months, a CV or background summary for property investment experience, and details of beneficial ownership for corporate structures.

For business financials: the last two to three years of full filed accounts, recent management accounts (year-to-date P&L and balance sheet), three to six months of business bank statements, forecasts if the office move will significantly change overhead structure, and details of existing borrowing and any personal guarantees already given.

For the property: heads of terms or draft purchase contract, full property details including address, estimated value, age, tenure, and type, existing leases and rent schedule for investment offices, service charge budgets and accounts, building insurance schedule, planning and building control documents, and an EPC certificate.