16 June 2026
Lowest rate is currently 5.74% - 5 years fixed interest only mortgage at 75% LTV
5 June 2026
Lowest rate is currently 6.44% - 2 years tracker interest only mortgage at 65% LTV
25 March 2026
Lowest rate is currently 5.94% - 5 years fixed interest only mortgage at 75% LTV
19 March 2026
Lowest rate is currently 5.69% - 5 years fixed interest only mortgage at 75% LTV
17 March 2026
Lowest rate is currently 6.44% - 2 years tracker interest only mortgage at 65% LTV
11 March 2024
First Published
Quantum Mortgages is a UK-based specialist lender, not to be confused with Quantum Mortgage Corporation (USA) or Quantum Finance (Australia).
Quantum Mortgages describes itself as a lender for "common sense" solutions. They were founded to push back against the automation of the mortgage market. While most banks rely on algorithms for decision-making, Quantum Mortgages focuses entirely on manual underwriting.
You can use our free mortgage comparison tool below to compare products from Quantum Mortgages against other lenders:
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About these rates
Rates shown are illustrative based on the property value, mortgage amount, and term you entered above. Actual rates and total cost depend on your credit profile, deposit, and lender assessment. APR figures include product fees where applicable. Early repayment charges may apply. Rates are not guaranteed and may change before you apply - speak to an adviser to confirm what's available to you today. For a per-product representative example, open Show full details on any card above.
About Quantum Mortgages
Launched in 2022, Quantum Mortgages is a specialist Buy-to-Let (BTL) lender. They do not offer residential mortgages for you to buy a home to live in.
Their philosophy is built on the belief that experienced landlords often have complex lives that don't fit into a standard credit scorecard. By using human underwriters to review every case, they can lend on properties and to borrowers that high-street banks typically reject.
Mortgage & Finance Products
Quantum Mortgages focuses exclusively on the Buy-to-Let market in England, Wales, and Northern Ireland.
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Specialist Buy-to-Let:
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Complex Properties: They are experts in properties that fail standard valuations, such as deck access and high-rise flats (no height limit), studio flats (min 30sqm), and properties above/adjacent to commercial premises, even takeaways and pubs
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HMOs & MUFBs: Finance for Houses in Multiple Occupation (up to 12 rooms) and Multi-Unit Freehold Blocks (up to 12 units)
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Ex-Local Authority: They are very open to lending on former council flats and houses, even where there is a high percentage of local authority ownership in the block
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Borrower Types:
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Foreign Nationals & Expats: They lend to UK nationals living abroad and foreign nationals investing in the UK
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Limited Companies: They lend to SPVs (Special Purpose Vehicles) and trading companies
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First-Time Landlords: They accept new landlords, provided they are homeowners
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Adverse Credit: As manual underwriters, they can take a view on borrowers with historic credit issues (CCJs/Defaults), provided there is a good explanation
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Green Boost:
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They offer a unique "Green mortgage" product where, if your property has an EPC rating of A, B, or C, you may be eligible for a higher Loan-to-Value (LTV) or better rates
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Compare today's best mortgage rates
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Pros and Cons of Quantum Mortgages
Here is a balanced overview of choosing Quantum for your investment finance:
Pros:
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Manual Underwriting: Every case is assessed by a human
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Northern Ireland Lending: Unlike many specialist lenders who stick to the UK mainland, Quantum actively lends in Northern Ireland
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Property Flexibility: If you are buying a flat with deck access (balcony access) or near a commercial unit, Quantum is one of the few lenders who will consider it
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No Credit Scoring: They check your credit file to see your history, but they do not use a rigid "scorecard" to make the final decision
Cons:
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Intermediary-Only: You cannot apply directly. You must use a mortgage broker to access their products
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Cost: As a specialist lender taking on higher risks, their interest rates are typically higher than high street lenders
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Buy-to-Let Only: They cannot help you with a residential mortgage
Customer Service and Reviews
As a relatively new lender (launched 2022) that deals only with brokers, direct consumer reviews are scarce.
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Broker Feedback: In the mortgage industry, they have quickly built a strong reputation for "doing what they say." Brokers appreciate having direct access to underwriters to discuss a case before submitting it
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Service Style: They are known for being pragmatic. If a valuation report throws up a minor issue, they are more likely to look for a solution than to withdraw the offer immediately
How to Apply
They are an intermediary-only lender. You cannot apply for a mortgage directly with them; you must use a professional mortgage broker.
Through a Broker: You must use an independent mortgage broker. It is highly recommended to use one who specialises in Buy-to-Let or Expat finance. Get started to speak with one of our experts who will happily act on your behalf
Yes. Quantum Mortgages is one of the few specialist Buy-to-Let lenders that covers England, Wales, and Northern Ireland.
No. They state clearly that they do not use automated credit scoring. They rely on a credit search (to see the data) and a human decision.
Generally, no. They require First-Time Landlords to be existing homeowners (owner-occupiers). They do not typically lend to someone whose very first property purchase is a Buy-to-Let (though criteria can change, so check with a broker).
Yes. This is a specific niche for them. They are comfortable lending on flats above restaurants, takeaways and shops usually subject to a maximum LTV (e.g. 70% -75%).