Top 10 Lenders to Secure £700,000 Buy-to-Let Business Finance in 2026

Buy-to-let business finance at the £700,000 level is typically structured as a commercial mortgage taken out by a limited company or individual investor to purchase a residential property that will be rented out. The lender secures the loan against the property itself, and rental income is used to cover monthly repayments. Most lenders will assess the projected rental yield, requiring that rental income comfortably exceeds the mortgage payment, often by a margin of 125% to 145%. Interest can be charged on a fixed or variable rate basis, and terms commonly range between 5 and 25 years. Arrangement fees, valuation fees, and legal costs also apply and should be factored into your overall borrowing costs.

Eligibility depends on the lender, but most providers will expect you to have a good credit history and a proven track record in property investment. If borrowing through a limited company, the lender will assess the company's financials, the experience of its directors, and the viability of the investment property. Lenders typically look for a rental income projection that meets their interest coverage ratio requirements. A deposit is usually required, and for buy-to-let mortgages this often starts from 25% of the property value, meaning you may need at least £175,000 to put down on a £700,000 purchase. Some lenders may also consider your wider portfolio and personal income as additional security.

Interest rates vary considerably based on the lender, the strength of your application, your credit profile, and the loan-to-value ratio you require. Generally, the larger your deposit, the more competitive the rate. Buy-to-let mortgage rates are typically higher than residential mortgage rates due to the perceived additional risk. Terms can range from 5 to 25 years, with many investors opting for interest-only arrangements to maximise monthly cash flow, repaying the capital at the end of the term through a sale or remortgage. Arrangement fees, which can be a percentage of the loan amount or a flat fee, should also be considered when comparing total borrowing costs across different providers.

A buy-to-let commercial mortgage is designed for long-term property letting, offering lower interest rates and repayment terms of up to 25 years. Bridging finance, by contrast, is a short-term facility typically lasting 6 to 18 months, used to complete a purchase quickly or bridge a funding gap. Bridging loans carry higher interest rates but offer significantly faster completion and more flexible criteria. Development finance is entirely different: it funds ground-up construction or major refurbishment, with funds released in stages and repaid upon sale or refinance. For purchasing a lettable residential property with the intention of holding it long term, a buy-to-let mortgage is almost always the most cost-effective option. However, if the property requires substantial renovation before it can be let, a bridging loan or development finance may be more appropriate initially, with a refinance onto a buy-to-let mortgage once the work is complete.

Yes, and this is a common approach for property investors. Using a Special Purpose Vehicle (SPV) limited company for buy-to-let investment has become increasingly popular, particularly following changes to mortgage interest tax relief for individual landlords. Most specialist buy-to-let lenders are comfortable lending to SPVs and will assess the application based on the company's structure, the directors' experience, and the rental income forecast. Lenders typically require a personal guarantee from the directors, and some may also ask for a debenture over the company. Borrowing through a limited company can offer tax efficiency advantages, but you should consult a qualified tax adviser to understand the implications for your specific circumstances.

Start by comparing interest rates and arrangement fees across multiple lenders, but do not base your decision on cost alone. Look at the lender's track record in the buy-to-let market, their understanding of limited company borrowing if applicable, and the flexibility of their criteria around rental income calculations. Check whether they offer fixed or variable rate options and whether there are any early repayment charges. Speed of processing can be important if you are working to a purchase deadline, and some specialist lenders can move faster than high street banks. Finally, consider using an experienced commercial finance broker who can access a wider panel of lenders and negotiate terms on your behalf, potentially saving you both time and money.