With mortgage rates still high, should I push through a rent increase for my existing tenants, and if so, what's a 'fair' amount and how do I officially serve notice without upsetting them too much?

Quick Answer

Rising mortgage rates (currently 5.0-6.5%) and Section 24 costs often necessitate rent reviews. Any increase should align with local market rates, giving proper notice (e.g., Section 13 for statutory increases).

## Rent Review Strategies for Existing Tenancies When considering a rent increase for existing tenants, it is crucial to balance your increased costs with local market realities and tenant retention. With current Bank of England base rates at 4.75% as of December 2025, and typical BTL mortgage rates ranging from 5.0% to 6.5%, many landlords have seen their operational costs rise significantly. Additionally, Section 24 means mortgage interest is no longer deductible for individual landlords, further impacting net rental income. A considered approach, balancing the **investment viability** with tenant relations, is essential. * **Market Analysis**: Research comparable properties in your specific postcode to understand current rental values. Websites like Rightmove and Zoopla provide insights into what similar homes are letting for. This helps determine a 'fair' and justifiable increase, preventing overpricing in your **local rental market**. For instance, if similar properties are renting for £100 more, it provides a benchmark for your own increase. * **Cost Alignment**: Factor in your increased mortgage payments – at a 5.5% fixed rate, a £200,000 buy-to-let mortgage could see interest payments of approximately £917 per month. Consider other rising expenses such as maintenance and insurance when calculating a viable new rent. This cost alignment is a core part of **rental yield calculations**. * **Tenant History**: Long-term, reliable tenants often warrant a slightly more conservative approach to rent increases. The cost of voids, re-letting fees, and potential damage from new tenants can quickly outweigh a marginal rent gain. * **Added Value**: If you've made recent improvements to the property, such as a new boiler, fresh decor, or upgraded white goods, these can justify a higher increase. A new kitchen, costing £3,000-£8,000, for example, could justify an additional £50-100 per month in rent, paying back over several years. ## Avoiding Common Pitfalls with Rent Increases Unplanned or aggressive rent increases can lead to tenant turnover, which incurs significant costs and management time. Avoiding these pitfalls is crucial for maintaining **landlord profit margins**. * **Setting Unrealistic Rents**: Charging significantly above the local market rate will likely lead to tenants moving out. High tenant turnover is financially detrimental due to lost rent during voids, re-advertising costs, referencing fees, and potential redecoration expenses. * **Poor Communication**: Rushing the notice period or failing to explain the reasons for an increase can strain tenant relationships. Transparency, where appropriate, can help tenants understand the necessity of the increase. * **Ignoring Lease Terms**: Attempting to raise rent without adhering to the terms outlined in the Assured Shorthold Tenancy (AST) agreement can render the increase invalid and lead to disputes. Always review the contractual clauses governing rent reviews. * **Failure to Use Correct Procedures**: Informal notices are not legally binding. A landlord must use an official Section 13 notice for statutory increases or comply with the terms of a rent review clause in an existing contract. Failure to do so can result in costly delays if challenged. ## Investor Rule of Thumb Ensure any rent increase is justifiable by current market rates and your legitimate cost increases, always following correct legal notice procedures to maintain tenant relations and avoid voids. ## What This Means For You With BTL mortgage rates impacting your cash flow, reviewing rents is a necessary part of managing your portfolio. Understanding the correct legal framework for rent increases, combined with a practical assessment of market conditions, is key to successful portfolio management. Most landlords effectively manage rent reviews by balancing commercial viability with tenant retention. If you want to refine these strategies for your specific properties, this is exactly what we dissect within Property Legacy Education. ## Official Notice Procedures for Rent Increases There are two primary ways to legally increase rent for existing tenants, depending on your Assured Shorthold Tenancy (AST) agreement. Each has specific requirements to ensure the increase is valid. * **Contractual Rent Review Clause**: If your AST includes a rent review clause, you must follow its terms explicitly. This clause typically dictates when an increase can occur (e.g., after 12 months) and how much notice must be given (often at least one month). According to government guidance, this is only valid if the clause allows a review without tenants needing to agree, for instance, by linking it to a specific index or market rate. * **Section 13 Notice**: If there is no rent review clause, or if the current fixed term has ended and the tenancy is periodic (rolling monthly), you must use a 'Landlord's notice proposing a new rent' (Form 4 - S13). This notice requires a minimum of two months' written notice and can only be used once every 12 months. HMRC rules specify clear deadlines for serving this, ensuring tenants have adequate time to respond or find alternative accommodation. * **Mutual Agreement**: Landlords and tenants can mutually agree to a rent increase at any time. This agreement should always be in writing and signed by all parties to avoid future disputes. This is often the least confrontational method if the increase is reasonable. Understanding these legal and practical aspects is vital to a compliant and effective rent increase process without compromising **buy-to-let investment returns**.

Steven's Take

With BTL mortgage rates at 5.0-6.5% and Section 24 meaning no mortgage interest relief, many landlords like us are seeing their costs rise significantly. You absolutely need to review your rental income to ensure your property remains profitable. The key is to justify your increase with solid market comparables and your genuine cost increases, not just what you'd like to charge. Always follow the correct Section 13 or contractual notice procedures to protect yourself legally. Don't be afraid to have an open conversation with your tenants; responsible increases are a part of doing business.

What You Can Do Next

  1. Step 1: Research current local market rents for comparable properties in your area using portals like Rightmove and Zoopla to establish a fair market rate.
  2. Step 2: Review your existing Assured Shorthold Tenancy Agreement to check for a rent review clause and determine if it applies or if a Section 13 notice is required.
  3. Step 3: Calculate your increased property costs, including current mortgage interest payments (e.g., at a 5.5% rate) and other non-deductible expenses, to justify the proposed increase.
  4. Step 4: Serve the appropriate notice. Use Form 4 (Section 13 notice) if no contractual rent review clause exists or the fixed term has ended, ensuring you provide a minimum of two months' notice. Details are available on gov.uk/rent-increase-landlord.

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