Remortgaging a Buy-to-Let Property: A Step-by-Step Guide

Remortgaging your buy-to-let property can save you thousands of pounds in interest payments, unlock equity for further investments, or simply move you to a more suitable lender. Yet many landlords stick with their existing deal long after their initial fixed rate has ended, often paying their lender’s standard variable rate (SVR) without realising how much this costs them.

Whether you’re approaching the end of your fixed-term mortgage, looking to consolidate debt, or want to access equity to expand your portfolio, understanding the remortgaging process is essential. This guide walks you through each step, from assessing your current position to completing your new mortgage arrangement.

Why Consider Remortgaging Your Buy-to-Let?

Before diving into the process, it’s worth understanding the main reasons landlords remortgage:

Securing a better interest rate is the most common motivation. If you’re on your lender’s SVR—which can be 2-3% higher than competitive fixed rates—you could be overpaying significantly each month.

Releasing equity allows you to access the increased value in your property. Many landlords use this capital as deposits for additional properties, funding refurbishments, or diversifying their investments.

Switching mortgage types might better suit your circumstances. You might move from interest-only to repayment, or vice versa, depending on your financial strategy and retirement plans.

Consolidating debt can simplify your finances, though this approach requires careful consideration of the total cost over the mortgage term.

When Should You Remortgage?

Most buy-to-let mortgages come with an initial fixed or tracker rate period, typically lasting two, three, or five years. The optimal time to remortgage is usually three to six months before this period ends.

Starting early gives you time to compare deals, complete valuations, and switch before reverting to the SVR. Many lenders allow you to apply up to six months in advance and will honour the rate you secure, even if rates rise before completion.

If you’re currently within a fixed-rate period, check your early repayment charges (ERCs). These penalties—often 2-5% of the outstanding loan—can make remortgaging uneconomical until they expire or reduce.

Step 1: Review Your Current Mortgage

Begin by gathering your existing mortgage documentation. You need to know:

  • Your current interest rate and monthly payment
  • Your outstanding balance
  • When your current deal ends
  • Any ERCs that apply
  • Whether you’re on interest-only or repayment terms

Request a redemption statement from your current lender. This confirms exactly how much you owe and any charges for leaving early.

Calculate your loan-to-value (LTV) ratio by dividing your mortgage balance by your property’s current value, then multiplying by 100. If you borrowed £150,000 and your property is now worth £250,000, your LTV is 60%. Lower LTVs typically unlock better interest rates.

Step 2: Assess Your Property’s Current Value

Lenders will require a formal valuation, but getting a realistic estimate beforehand helps you understand which deals you might qualify for.

Check recent sale prices of comparable properties in your area using Rightmove or Zoopla. Estate agents often provide free valuations, though remember they may overestimate to win your business.

Your property’s value directly affects your remortgaging options. If values have risen since you purchased, you’ll have a lower LTV and access to better rates. Conversely, if values have fallen, you might find yourself with limited options or even in negative equity.

Step 3: Check Your Rental Income Coverage

Buy-to-let mortgage lenders apply strict rental coverage calculations. Most require your monthly rent to be at least 125-145% of your monthly mortgage payment, calculated at a notional stress rate (typically 5.5-6%).

For example, if you’re borrowing £200,000 on an interest-only basis and the lender stress-tests at 5.5%, they’ll calculate: £200,000 × 5.5% ÷ 12 = £916.67 per month. At 145% coverage, you’d need monthly rent of £1,329.

Higher-rate taxpayers often face tougher rental coverage requirements—sometimes 145% or more—due to the restriction on mortgage interest tax relief.

If your rental income has increased since your original mortgage, this works in your favour. If it hasn’t kept pace with interest rate rises, you may need to demonstrate additional income or accept a higher LTV product.

Step 4: Review Your Personal Financial Position

Unlike residential mortgages, buy-to-let lending focuses primarily on rental income rather than your personal earnings. However, lenders still assess your overall financial health.

Most require a minimum personal income (typically £25,000-£30,000 annually), though this varies between lenders. They’ll also conduct credit checks, so review your credit report beforehand through Experian, Equifax, or TransUnion.

Address any issues on your credit file before applying. Even small problems—missed mobile phone payments or high credit utilisation—can affect your application or the rates offered.

Portfolio landlords (those with four or more mortgaged properties) face additional scrutiny. Since 2017, lenders must assess your entire portfolio’s financial viability, not just the individual property you’re remortgaging.

Step 5: Compare Remortgage Deals

This is where many landlords benefit from professional help. The buy-to-let mortgage market is complex, with significant variation between lenders on rates, fees, and criteria.

Key factors to compare include:

Interest rates: Fixed rates offer certainty for two to five years, whilst tracker rates follow the Bank of England base rate. Consider your risk tolerance and market outlook.

Arrangement fees: These typically range from £995 to £2,000, sometimes more. Some lenders offer fee-free deals with slightly higher rates. Calculate the total cost over your intended fixed period.

Valuation and legal fees: Some lenders cover these costs, others don’t. Factor these into your comparison.

Early repayment charges: If you might sell or remortgage again soon, check the ERC structure.

Portability: Can you transfer the mortgage to a different property if you sell? This flexibility matters if your portfolio strategy might change.

Using a specialist buy-to-let mortgage broker can save considerable time and potentially money. They understand which lenders accept different property types, have relationships that might secure better rates, and can navigate complex scenarios like limited companies or HMOs.

Step 6: Submit Your Application

Once you’ve chosen a deal, submit your application with all required documentation:

  • Proof of identity and address
  • Evidence of rental income (tenancy agreements, bank statements showing rent received)
  • Property details and insurance information
  • Your existing mortgage statement
  • Details of any other properties and mortgages you own

Be thorough and accurate. Incomplete applications delay the process, and any discrepancies can lead to declined applications or withdrawn offers.

The lender will instruct a valuation of your property. This isn’t a survey—it’s simply to confirm the property’s worth for lending purposes. You’ll typically pay for this upfront (£250-£500 depending on property value).

Simultaneously, conveyancing solicitors will handle the legal transfer. Even though you’re not moving property, legal work is required to register the new charge against the property.

The entire process typically takes 4-8 weeks from application to completion, though this varies depending on the lender, the property, and how quickly you provide information.

Step 8: Completion and Ongoing Management

On completion day, your new lender pays off your old mortgage, and your new arrangement begins. Your first payment is usually due one month later.

Set up your direct debit immediately and diarise when your new fixed rate ends. Many landlords set a reminder for 6-9 months before expiry to begin the process again.

Keep thorough records of all mortgage interest paid. Whilst you can no longer deduct this directly from rental income for tax purposes, you can claim a 20% tax credit on mortgage interest payments. Your accountant will need accurate figures for your Self Assessment tax return.

Special Considerations

Limited company remortgaging: If you’ve incorporated your property business, remortgaging works similarly but often with different lenders and criteria. Some lenders specialise in SPV (Special Purpose Vehicle) buy-to-let mortgages.

HMOs and multi-unit properties: These require specialist lenders familiar with this property type. Rental coverage calculations differ, and you’ll need appropriate licensing documentation.

Properties with sitting tenants: Some lenders won’t remortgage tenanted properties, whilst others require specific tenancy types (Assured Shorthold Tenancies). Check this before applying.

Adverse credit: Past financial difficulties don’t automatically disqualify you, but they limit your options and increase costs. Specialist adverse credit lenders exist, though rates are higher.

Costs to Factor In

Remortgaging isn’t free. Typical costs include:

  • Arrangement fee: £995-£2,000+
  • Valuation fee: £250-£500
  • Legal fees: £500-£1,000 (sometimes covered by the lender)
  • Broker fee: Free to £500+ (many brokers are paid by lenders)
  • Early repayment charge on existing mortgage: Variable, potentially thousands

Calculate whether the interest savings outweigh these costs over your intended fixed period. A simple spreadsheet comparing your current and proposed monthly payments makes this clear.

Key Takeaways

Remortgaging your buy-to-let property can deliver significant savings and strategic advantages, but it requires careful planning and timing:

  • Start the process 3-6 months before your current deal ends to avoid reverting to expensive SVR rates
  • Understand your LTV ratio and rental coverage, as these determine which deals you can access
  • Compare the total cost of deals over the fixed period, not just the headline interest rate
  • Consider using a specialist buy-to-let mortgage broker who understands the market and lender criteria
  • Factor in all costs—arrangement fees, valuation, legal work, and any ERCs
  • Keep thorough records of mortgage interest for your tax return, as you can claim 20% tax relief
  • Portfolio landlords should be prepared for more detailed financial scrutiny across all properties

Remember, every landlord’s situation differs. Whilst this guide provides a comprehensive overview, always consult a qualified accountant regarding your specific tax position, and consider professional mortgage advice to ensure you secure the most suitable deal for your circumstances.