Keystone Property Finance is a specialist lender in the UK focused on providing tailored buy-to-let mortgage solutions for both individual landlords and professional property investors.
Keystone offers a variety of mortgage products designed to accommodate complex borrower profiles, including limited companies, portfolio landlords, and those with more unique financial situations.
At Kerr & Watson, we partner with Keystone Property Finance to ensure that our clients have access to the most suitable mortgage products for their property investment needs.
Why do people consider Keystone Property Finance?
Specialist Buy-to-Let Expertise
Keystone Property Finance is well-known for its expertise in the buy-to-let market, offering products that support landlords with diverse property portfolios, including limited company buy-to-let options and solutions for Houses in Multiple Occupation (HMOs).
Flexible Lending Criteria
Keystone understands that not every borrower fits the mainstream lending profile, which is why they provide flexible lending criteria. This includes higher Loan-to-Value (LTV) options, mortgages for self-employed landlords, and those with complex income streams.
Competitive Rates for Landlords
Keystone Property Finance offers a wide range of competitive products designed to suit different landlord needs, whether you’re looking to expand your portfolio, refinance, or make your first buy-to-let investment.
Switching Your Rate with Keystone Property Finance
If your current mortgage product with Keystone is coming to an end, you may want to explore their rate switch options. Keystone provides a smooth process for switching your rate, allowing you to avoid additional fees or complications, while Kerr & Watson ensures that you secure the best available product based on your financial situation and goals.
Keystone also offers products specifically for landlords managing Houses in Multiple Occupation, providing flexible and competitive rates.
Why Contact Kerr & Watson?
Navigating the mortgage market can be challenging, especially if you have a portfolio of properties or are looking for non-standard lending solutions. At Kerr & Watson, we simplify the process by providing expert advice and direct access to Keystone’s products, ensuring that you make informed decisions every step of the way.
Get in Touch
If you’re a landlord seeking flexible buy-to-let mortgage solutions, Keystone Property Finance might be the right lender for you.
Contact Kerr & Watson today to speak with an adviser and explore how we can help you secure the right mortgage for your investment.
The information on this page is not tailored to any individual readers and should not be considered financial advice under any circumstances.
If you are seeking advice about a mortgage, you should speak with a qualified advisor.
Your Mortgage In 3 Easy Steps…
Conversation
Schedule a call to talk to a mortgage advisor about your goals, challenges and vision for your mortgage.
We will take the information gained on the call and carry out some research before sending you a bespoke recommendation.
If you would like an agreement in principle, we’ll also arrange this for you.
Application
We will submit the full application to the mortgage lender, sending them the documents and liaising with the underwriters until the mortgage has been fully offered on the new interest rate.
We will also communicate with you at every stage, from application to completion.
Marie Kitchener was extremely helpful with a difficult , quite complex case. Marie responded to our questions with understanding, great knowledge and we trusted her advice. The solicitor she recommended was brilliant too. Highly recommend Kerr & Watson.
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Lauren Murray
30 June 2026
Marie Kitchen was absolutely fabulous. We had an incredibly complicated case due to living abroad and a few hiccups along the way. Marie was persistent and helped us to resolve these efficiently. Highly recommend.
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Michelle
8 June 2026
My 2nd time dealing with Kerr & Watson and they didn't disappoint, great service, professional and patient - big shout out to Andreea & Stephen
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Sean Turner
2 June 2026
I had an excellent experience with Kerr and Watson and would happily recommend them.
A special mention has to go to James, who provided exceptional service throughout. He was professional, approachable, clear in his communication and always willing to help. His support made a huge difference, and we genuinely couldn’t have done it without him.
I would not hesitate in recommending K&W to any family or friends.
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Jackie
15 May 2026
Brad was quick with getting me the right mortgage insurance prior to a move abroad. Polite and professional. Also liked that he would call to remind me take any actions if I hadn't responded to emails
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Ade Kunle
1 May 2026
I will always recommend Kerr & Watson to friend and family.
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Minzel 33
23 April 2026
This is my second product with Matthew, securing a BTL for my LTD with the best rate on the market. Once again great support, guidance and smooth process. Highly recommended, knowledgeable team. Reliable service.
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Freya B
14 April 2026
The team at Kerr & Watson were brilliant end to end. Daniel explained everything clearly, was always available to answer questions and helped us secure a great mortgage rate. The mortgage broking service they offer is worth every penny and I'd not hesitate to use them again. Thank you!
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Dean Langton
7 April 2026
Excellent service and very nice people.
Would highly recommend using them.
Awards & Recognition
Contact Us
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Frequently Asked Questions About Keystone Finance
▸ ▾Is Keystone Property Finance a good buy-to-let lender?
Keystone Property Finance can be a good buy-to-let lender for the right landlord, especially where the case needs a specialist approach. They may be considered for standard buy-to-let properties, limited company landlords, portfolio landlords, HMOs, multi-unit properties and more complex rental cases.
That does not mean Keystone will be the best lender for every landlord. The right option depends on the property, rental income, deposit, ownership structure, landlord experience and wider circumstances. Kerr & Watson can compare Keystone with other buy-to-let lenders and explain which route is most suitable.
▸ ▾Do I need a mortgage broker to apply to Keystone Property Finance?
Keystone Property Finance works with mortgage brokers, so landlords will usually apply through an intermediary rather than directly with the lender.
Using a broker can be helpful because buy-to-let lending is criteria-led. Kerr & Watson can check whether your case fits Keystone’s requirements, review the rental calculation and compare other lenders before an application is submitted.
▸ ▾Can Kerr & Watson help me apply to Keystone Property Finance?
Yes, Kerr & Watson can help with Keystone Property Finance buy-to-let applications. We can review your property, rental income, deposit, landlord experience, ownership structure, personal income and wider portfolio before deciding whether Keystone is the right lender to approach.
If Keystone is suitable, we can help prepare and submit the application. If another buy-to-let lender is a better fit, we will explain why and guide you through your options.
▸ ▾Does Keystone Property Finance offer limited company buy-to-let mortgages?
Yes, Keystone Property Finance may consider limited company buy-to-let mortgages, subject to their lending criteria and product availability. This can be useful for landlords buying or remortgaging through a special purpose vehicle or limited company structure.
Limited company buy-to-let applications can be more detailed than personal buy-to-let cases. The lender may review the company structure, directors, shareholders, rental income, deposit source and overall affordability.
▸ ▾Can portfolio landlords use Keystone Property Finance?
Keystone Property Finance may be suitable for portfolio landlords, depending on the size and strength of the portfolio, property types, rental income and wider borrowing position.
Portfolio landlord applications often need careful preparation because lenders may assess both the new property and the wider background portfolio. Kerr & Watson can help organise the information needed and compare Keystone with other portfolio landlord lenders.
Keystone Property Finance may consider HMO mortgages, subject to the property, licensing position, landlord experience and the lender’s criteria.
HMO mortgages are usually more specialist than standard buy-to-let mortgages. The lender may look at the number of occupants, tenancy type, property layout, valuation, rental income and your experience as a landlord.
Keystone Property Finance may consider multi-unit property mortgages, depending on the property and the lender’s criteria. A multi-unit property is usually a building split into separate self-contained units under one title.
These cases can be more complex than a standard buy-to-let application. Kerr & Watson can review the property structure, rental income and landlord position before advising whether Keystone or another specialist lender is more suitable.
▸ ▾Can first-time landlords use Keystone Property Finance?
Keystone Property Finance may consider first-time landlords in some circumstances, depending on the property, rental income, deposit and the lender’s criteria at the time of application.
First-time landlord cases can need extra care, especially where the property is an HMO, multi-unit property or being purchased through a limited company. Kerr & Watson can check whether Keystone is suitable or whether another buy-to-let lender may be a better option.
▸ ▾How much can I borrow with Keystone Property Finance?
How much you can borrow with Keystone Property Finance will usually depend on the property value, rental income, deposit, loan-to-value, interest coverage calculation and your wider circumstances.
Buy-to-let borrowing is often driven by rental income rather than personal income alone. Kerr & Watson can check the rental calculation and compare Keystone with other buy-to-let lenders to see what may be possible.
▸ ▾Can I remortgage to Keystone Property Finance?
Yes, Keystone Property Finance may be an option if you want to remortgage a buy-to-let property. This could be to secure a new rate, raise capital, move from another lender or restructure your property finance.
Before remortgaging, it is worth reviewing the interest rate, product fees, rental stress testing, property value, early repayment charges and your longer-term plans. Kerr & Watson can help compare Keystone with other buy-to-let lenders and recommend the most suitable route.
Common Mortgage Lender Questions
▸ ▾How do I know which mortgage lender is right for me?
The right mortgage lender will depend on your income, deposit, credit history, property type, borrowing amount and long-term plans. Some lenders are better suited to straightforward residential mortgages, while others specialise in buy-to-let, complex income, adverse credit, commercial property or larger loans. A mortgage adviser can compare lenders and help identify which option may be most suitable for your circumstances.
▸ ▾Do all mortgage lenders use the same criteria?
No. Every mortgage lender has its own lending criteria, affordability model, credit scoring system, property requirements and risk appetite. This means one lender may decline an application that another lender is comfortable considering. Lender selection is an important part of the mortgage process.
▸ ▾Why use a mortgage broker instead of applying directly to a lender?
A mortgage broker can help compare lenders, check criteria before you apply and explain which options may be suitable for your circumstances. This can be especially useful if you are self-employed, have complex income, need a buy-to-let mortgage, have previous credit issues or are unsure which lender is likely to accept your application.
▸ ▾Can a whole-of-market mortgage broker access more lenders?
A whole-of-market mortgage broker can review a wide range of lenders and products, including high street banks, building societies, specialist lenders and intermediary-only lenders. This can give you a broader view of your options than approaching one lender directly.
▸ ▾What is an intermediary-only mortgage lender?
An intermediary-only lender is a lender that usually accepts applications through mortgage brokers rather than directly from customers. These lenders may offer products or criteria that are not available by applying directly online or through a branch. A mortgage broker can check whether an intermediary-only lender may be suitable for your case.
▸ ▾Does the lowest mortgage rate always mean the best lender?
Not always. The lowest rate may look attractive, but it is not automatically the best option. You also need to consider lender fees, affordability, criteria, product terms, early repayment charges, valuation requirements, service levels and whether the lender is likely to approve your application.
Yes. Mortgage lenders use different affordability calculators and assumptions. They may treat income, bonuses, commission, overtime, self-employed income, pension income, benefits, debts and childcare costs differently. This means the amount you can borrow may vary significantly from one lender to another.
▸ ▾Can a mortgage lender decline me even if I can afford the mortgage?
Yes. Mortgage lenders do not assess affordability alone. They may also review your credit history, employment type, income structure, deposit source, property type, loan-to-value, age, commitments and overall risk profile. Even if the monthly payment seems affordable, a lender may still decline the case if it does not meet their criteria.
▸ ▾If one lender declines me, can another lender still approve me?
Yes. A decline from one lender does not necessarily mean you cannot get a mortgage. Lenders assess applications differently, so another lender may take a more suitable view of your income, credit history, property or deposit. It is important to understand why the application was declined before approaching another lender.
▸ ▾Do lenders treat self-employed income differently?
Yes. Some lenders use the latest year’s income, while others average the last two years or assess salary and dividends for limited company directors. Some lenders may also consider retained profit, contractor income or more complex trading structures. Choosing the right lender can make a significant difference for self-employed applicants.
▸ ▾Do mortgage lenders accept bad credit?
Some lenders may consider applicants with bad credit, depending on the type, age and severity of the credit issue. Missed payments, defaults, CCJs, debt management plans, IVAs and previous arrears are all assessed differently by different lenders. A specialist lender may be more suitable if you have historic credit problems.
▸ ▾Can Kerr & Watson help me choose between mortgage lenders?
Yes. Kerr & Watson can review your circumstances, compare suitable lenders and explain which options may be available. We can help with residential mortgages, buy-to-let mortgages, specialist lending, complex income, adverse credit, bridging, commercial finance and later life lending, depending on your needs.