Cambridge’s rental market is supported by several long-term demand drivers, including the University, the Biomedical Campus, and the local technology and life sciences cluster. ONS data shows average private rents in Cambridge reached £1,797 per month in January 2026, with annual growth of 2.2%. This is higher than the East of England average of £1,268 over the same period (source: ONS Price Index of Private Rents, Cambridge local authority, January 2026).
For landlords considering a buy-to-let purchase or remortgage in Cambridge, 2026 brings a number of factors to weigh up: the first phase of the Renters’ Rights Act reforms from 1 May 2026, higher entry prices compared to other regional markets, evolving mortgage affordability criteria, and the question of whether to hold property personally or through a limited company.
This guide covers what you need to know from a mortgage perspective. It is not tax or investment advice — you should take professional advice on your specific circumstances before making any financial decisions.
How Buy-to-Let Mortgages Differ from Residential Mortgages
Buy-to-let mortgages are assessed differently from residential mortgages. The key differences are:
Deposit. Most lenders require a minimum deposit of 25% of the purchase price, giving a maximum loan-to-value (LTV) of 75%. Some lenders will accept 20%, though the range of products is more limited. In Cambridge, where entry prices are higher than in many regional markets, this means deposit requirements can be substantial. A 25% deposit on a £400,000 property is £100,000.
Affordability. Rather than basing affordability on your salary, lenders assess buy-to-let mortgages primarily on the expected rental income from the property. They apply a “stress test” to check whether the rent would cover the mortgage payments at a higher notional interest rate, not just the rate you would actually pay.
Interest only. Most buy-to-let mortgages are taken on an interest-only basis, meaning your monthly payments cover only the interest. The loan balance remains unchanged and is repaid when the property is sold or from other means. Capital repayment options are available but less common.
Rates. Buy-to-let mortgage rates are typically higher than residential rates for the same LTV and term. The exact rates available to you will depend on your deposit, the property, your tax status, and whether you are buying personally or through a company.
The Stress Test: How Lenders Assess Affordability
This is often the part that catches landlords out. Lenders do not simply check whether the rent covers the mortgage payment. Instead, they calculate whether the rent would cover the payment at a higher “stressed” interest rate, and then apply a buffer on top of that.
The calculation has two components:
Stressed interest rate. Lenders test affordability using a notional rate that is higher than your actual mortgage rate. The exact stressed rate varies by lender and product type, but five-year fixed products are generally tested at a lower stressed rate than two-year fixes. This can mean five-year fixes sometimes produce a different borrowing outcome to a shorter fix, depending on lender approach.
Interest coverage ratio (ICR). The ICR is the percentage by which the rental income must exceed the stressed mortgage interest. It varies by your tax status:
| Tax Status | Typical ICR | What It Means |
| Basic rate taxpayer (personal) | 125% | Rent must be 25% above stressed interest |
| Higher rate taxpayer (personal) | 145% | Rent must be 45% above stressed interest |
| Limited company (SPV) | 125% | Company structure often assessed at lower ratio |
ICR requirements vary by lender. The figures above are typical but not universal. A broker can identify which lenders’ criteria best fit your circumstances.
If the rental income falls short of the stress test, some lenders offer “top slicing” — where your personal income is used alongside the rental income to support the application. This is more commonly available to higher-earning applicants and varies by lender.
Personal Name vs Limited Company: What to Consider
One of the most significant decisions for buy-to-let investors is whether to hold property in their personal name or through a special purpose vehicle (SPV) limited company. This is primarily a tax question, not a mortgage question, but the structure you choose affects the mortgage products available to you.
Personal ownership. Rental income is added to your other income and taxed at your marginal rate. Since April 2020, mortgage interest can no longer be deducted from rental income for individual landlords. Instead, you receive a 20% tax credit on interest payments. For higher and additional rate taxpayers, this means a larger effective tax bill than under the old rules.
Limited company (SPV). The company pays corporation tax on profits, and mortgage interest remains fully deductible as a business expense. This can be more tax-efficient for higher rate taxpayers, though there are additional costs including company accounts, annual returns, and potentially higher mortgage rates.
This is a complex area with significant tax implications. The right structure depends on your income, portfolio size, and long-term plans. You should take advice from a qualified tax adviser or accountant before deciding. A mortgage broker can then advise on the products available for your chosen structure.
The Cambridge Rental Market
Cambridge’s rental market benefits from several sustained demand drivers: the University of Cambridge (around 24,900 students in 2024–25, source: University of Cambridge), the Cambridge Biomedical Campus (one of the largest biomedical research campuses in Europe, with a workforce of around 23,000, source: Cambridge Biomedical Campus), and a technology and life sciences cluster that attracts professionals from across the UK and internationally.
ONS data shows average private rents in Cambridge reached £1,797 per month in January 2026, up 2.2% year on year. This was lower than the East of England average growth of 4.9% over the same period, though Cambridge’s rents started from a higher base.
When assessing whether a property works as a buy-to-let investment, the gross rental yield is a useful starting point. This is calculated as annual rent divided by the purchase price, expressed as a percentage. For example, a property purchased for £350,000 with monthly rent of £1,400 would have a gross yield of 4.8%. However, gross yield does not account for mortgage payments, maintenance, void periods, insurance, letting agent fees, or tax — all of which reduce the actual return.
Cambridge’s yield profile differs from lower-priced markets. Higher entry prices mean gross yields can be lower than in some regional cities, but rental demand is strong and void periods can be shorter in areas with sustained employment and student demand. For a broader view of Cambridge’s residential areas and the demand drivers in each, see our best areas Cambridge guide.
Stamp Duty on Buy-to-Let Purchases
If you already own a residential property, any additional purchase attracts a 5% stamp duty surcharge on top of the standard rates. This surcharge increased from 3% to 5% with effect from 31 October 2024 (source: GOV.UK) and applies from the first pound of the purchase price.
For a buy-to-let purchase at £350,000, the total SDLT would be £25,000 (standard SDLT of £7,500 plus £17,500 surcharge). At £450,000, it would be £35,000. Non-UK residents may face an additional 2% surcharge on top of these figures. These are substantial upfront costs that should be factored into your overall purchase costs.
For full worked examples, see our stamp duty guide.
The Renters’ Rights Act 2025: What Landlords Need to Know
The Renters’ Rights Act 2025 received Royal Assent on 27 October 2025. The government’s implementation roadmap (source: GOV.UK), published in November 2025, confirms that Phase 1 of the reforms takes effect from 1 May 2026. This is a substantial change to the private rented sector in England.
The key changes from 1 May 2026 include:
End of Section 21 “no-fault” evictions. Landlords will no longer be able to evict tenants without a valid reason. All possession proceedings will need to use Section 8, which requires a specific ground.
All tenancies become periodic. Fixed-term assured shorthold tenancies will be replaced by open-ended periodic tenancies. Existing ASTs will automatically convert. Tenants can leave with two months’ notice.
Rent increase restrictions. Rent can only be increased once per year using the Section 13 process. Tenants can challenge increases at the First-tier Tribunal.
No rental bidding. Landlords must advertise a specific rent and cannot invite or accept offers above the advertised price.
Right to request pets. Tenants will have a legal right to request permission to keep a pet. Blanket bans on pets will no longer be permitted.
Later phases are expected to introduce a mandatory Private Rented Sector Database, a PRS Landlord Ombudsman, and eventually the Decent Homes Standard. The government’s implementation roadmap sets out the direction and sequencing of these later reforms.
These changes do not directly affect your mortgage, but they change the risk profile and management requirements of buy-to-let ownership. Landlords should take legal advice on how the Act affects their existing tenancies and future letting arrangements.
Portfolio Landlords
If you own four or more mortgaged buy-to-let properties, most lenders will classify you as a portfolio landlord. This triggers additional underwriting requirements under the Prudential Regulation Authority (PRA) rules introduced in 2017.
Portfolio landlord applications typically require a full schedule of your existing properties including rental income, mortgage balances, outstanding terms, and property values. Lenders will assess the overall health of your portfolio, not just the individual property you are applying for.
This does not mean portfolio landlords cannot get mortgages — but the process is more involved and the choice of lender is more limited. A broker with experience in portfolio cases can identify which lenders are most suitable for your situation.
Frequently Asked Questions
Is buy-to-let worth it in Cambridge in 2026?
This depends entirely on your financial circumstances, the property, and your investment goals. Entry prices are higher in Cambridge than in many regional markets, which can reduce gross yields. Against that, rental demand is strong, void periods can be shorter, and rents have been rising. The Renters’ Rights Act introduces new obligations from 1 May 2026, and the stamp duty surcharge has increased. Whether a specific property works as an investment requires careful analysis of the numbers, including stress test affordability, and professional tax advice.
Is Cambridge a good place for buy-to-let?
Cambridge has several characteristics that support rental demand: the University, the Biomedical Campus, good transport links to London, and a technology sector that attracts professionals. However, “good for buy-to-let” is always property-specific. A property in the right location at the right price with strong rental demand can work well; the same type of property in a different location may not. A mortgage broker can help you assess whether the numbers work for a specific property.
What deposit do I need for a buy-to-let mortgage?
Most lenders require a minimum of 25% of the purchase price. Some lenders will consider 20%, though the product range is more limited and rates may be higher. A larger deposit — 30% or more — typically gives access to more competitive rates and makes the stress test easier to pass. In Cambridge, a 25% deposit on a £400,000 property is £100,000.
What is the 4.5 rule for mortgages?
The 4.5 income multiple is a residential mortgage concept, not a buy-to-let one. Residential lenders typically offer up to 4.5 times your annual income. Buy-to-let mortgages are assessed differently — primarily on the rental income the property generates, tested against a stressed interest rate and ICR, rather than on your salary.
Should I buy through a limited company or in my personal name?
This is primarily a tax question. Limited company structures can be more tax-efficient for higher rate taxpayers because mortgage interest remains fully deductible. However, they come with additional costs and complexity. You should take advice from a qualified tax adviser before deciding, and then speak to a broker about the mortgage products available for your chosen structure.
Which Cambridge areas have the strongest rental demand?
For rental properties targeting professionals and commuters, areas near Cambridge station (Petersfield, Romsey) and Cambridge North (Chesterton) tend to see strong demand. Trumpington and Cherry Hinton benefit from proximity to the Biomedical Campus. Student accommodation demand is concentrated around the city centre and areas with good cycling access to the University. For a detailed breakdown of each area, see our best area guide Cambridge.
Can I get a buy-to-let mortgage as a first-time buyer?
Some lenders will consider first-time buyer landlords, though the choice of products is more limited. Some lenders require you to already own a residential property. A broker can identify which lenders will accept first-time buyer applications and what additional criteria may apply.
Next Steps
Buy-to-let mortgages involve a wider range of variables than residential purchases: the stress test, your tax position, the rental market, stamp duty surcharges, and the changing regulatory environment. Getting the structure and the product right from the outset can make a meaningful difference to your returns.
Visit our Cambridge office to book a consultation with our Cambridge team, or call 01223 655 579.