Commercial Mortgage vs Bridging Loan

The question is not which is cheaper. It is which fits the situation.

Most comparisons between commercial mortgages and bridging loans get stuck on interest rates. Bridging costs more per month, so the assumption is that a commercial mortgage is always preferable. That logic is wrong, and it causes investors and business owners to either miss time-critical deals or use short-term finance in situations where long-term finance would have served them far better.

The right question is not which product has the lower rate. It is which product fits the timeline, the property's current condition, and the plan for how the borrowing ends. Answer those three questions correctly and the choice is usually straightforward.

What we see regularly is clients who have already decided before they call us, and the decision has been made on rate alone. The ones who came unstuck had either used a commercial mortgage on a property that was not yet ready for it, or bridging on an asset they intended to hold for years. Both errors are avoidable if the structure is right from the start.

What each product is designed to do

A commercial mortgage is a term loan, typically five to 25 years, secured against commercial or semi-commercial property. The lender assesses the property's income, the tenant's covenant, the borrower's financial position, and the asset's long-term viability. The process is thorough and takes time, usually four to eight weeks from application to completion. The rate is lower because the lender is taking a long-term, stable risk.

A bridging loan is short-term finance, typically up to 12 to 18 months for commercial property, designed to complete quickly where speed is critical or the property is not yet in a condition that satisfies a mortgage lender. The underwriting focuses primarily on the security value and the exit strategy. It can complete in days to weeks. The rate is higher because the lender is accepting greater short-term risk.

Side by side: the key differences

Feature	Commercial Mortgage	Bridging Loan
Term	5 to 25 years	1 to 18 months
Typical interest rate	5% to 7% per annum	0.65% to 1.25% per month
Completion speed	4 to 8 weeks	Days to 3 weeks
Typical LTV	60% to 75%	65% to 75%
Repayments	Monthly capital and interest	Interest rolled up, repaid at exit
Property condition	Must be lettable or trading	Vacant, unmortgageable, mid-refurb accepted
Primary underwriting focus	Income, covenant, affordability	Security value and exit strategy

What a bridging loan actually costs versus a commercial mortgage

The rate difference looks stark until you factor in the term. Here is a straightforward example on a £500,000 commercial property purchase at 70% LTV, borrowing £350,000.

Scenario	Rate	Monthly cost	Total interest over period
Bridging loan (6 months)	0.85% per month	£2,975 rolled up	£17,850
Commercial mortgage (year 1)	6.0% per annum	£1,750 interest only	£21,000 over 12 months

Over six months, the bridging loan in this example costs less in total interest than a year on a commercial mortgage, and the bridge completes in weeks rather than months. For an auction purchase or a deal with a tight deadline, the calculus is clear.

The point is not that bridging is cheap. It is that the total cost over the period used can be entirely justifiable when the alternative is losing the deal, missing the deadline, or paying a mortgage on a property that cannot yet be let.

The scenarios where bridging is the right answer

Auction purchases

Auction completions are typically required within 28 days. A commercial mortgage takes four to eight weeks in most cases. A bridging loan is the only realistic option. Once the deadline has passed and the property is secured, you refinance onto a commercial mortgage at your pace.

Property requiring refurbishment

Commercial mortgage lenders require a property to be in lettable condition with a stable income profile. A vacant office in poor condition or a retail unit requiring fit-out will not qualify. A bridging loan funds the purchase and the works. Once the property is refurbished, tenanted, and generating income, it refinances onto a commercial mortgage.

Speed-critical completions

A motivated vendor, a price reduction contingent on fast completion, or a competitor also in the frame. When speed is a commercial advantage, bridging delivers it. Commercial mortgages cannot compete on timeline.

Short-term ownership

If you are buying to refurbish and sell, a commercial mortgage with early repayment charges makes no sense. A bridging loan is interest-only with no ERCs in most cases, aligned precisely with a short ownership period.

Funding the business, not the building

Bridging is also the answer when the need is not the property at all. A tax bill, a partner buyout, or an acquisition that has to complete on a fixed date can be funded against property the business already owns, which is covered in the business bridging loans guide.

The scenarios where a commercial mortgage is the right answer

Stable, income-producing asset

You are buying a fully let office, retail unit, or industrial property with a strong tenant covenant and you intend to hold it long term. A commercial mortgage gives you a lower rate, predictable payments, and a structure matched to the asset's income profile. Using a bridge here simply adds cost for no benefit.

Owner-occupied premises

A trading business buying its own premises is a straightforward commercial mortgage case. The lender assesses the business's trading performance and the property's value. There is no time pressure in most cases, and the long-term rate advantage of a mortgage is material over a 10 to 20 year hold.

Refinancing an existing asset

If you are refinancing a commercial property you already own and hold long term, a commercial mortgage remortgage is the appropriate product. Bridging would add unnecessary cost and introduce redemption risk at the end of the term.

The mistake most investors make is treating bridging as a last resort. Used correctly, it is a first choice, the product that gets you into a deal that a mortgage simply cannot reach in time.

When you might use both, in sequence

The bridge-to-mortgage strategy is one of the most effective tools available to commercial property investors. You use a bridging loan to acquire or refurbish the asset quickly, then refinance onto a commercial mortgage once the property is stabilised and generating income. This is particularly effective for permitted development conversions, commercial refurbishments where the property needs upgrading to attract a tenant before a mortgage lender will consider it, and auction acquisitions where the bridge buys time to complete proper due diligence and arrange long-term finance without deadline pressure.

FD Commercial arranges both products and can structure the sequence from day one, ensuring the commercial mortgage is lined up before the bridge completes so there is no gap between the two.