Sample Rent Increase Letter In The UK: Templates And Legal Steps

If you manage a small property portfolio or lease out part of your business premises, there will come a time when you need to increase the rent. A clear, compliant rent increase letter can make that process smoother, help you avoid disputes, and protect your cash flow.

In the UK, the correct approach depends on whether the property is a residential assured shorthold tenancy (AST) or a commercial lease. The law also treats fixed-term agreements differently from periodic ones. In short, the letter itself is only part of the story - the notice type, timing and the clause in the lease all matter.

Below, we walk you through the rules, share a sample rent increase letter you can adapt, and flag the most common pitfalls to avoid. By the end, you’ll know when a simple letter works, when you must use a prescribed notice, and how to secure a signed rent increase agreement that stands up if challenged.

What Is A Rent Increase Letter (And When Is It Valid)?

A rent increase letter is a written notice from the landlord proposing (or confirming) a new rent from a future date. It can be used to:

• Ask a tenant to agree to a higher rent by consent (you both sign to confirm).
• Accompany a formal notice where the law or lease requires a set procedure (for example, to explain the basis for the increase).
• Record the outcome after a rent review under a commercial lease.

However, a letter is not always enough by itself. In England for residential ASTs on a periodic tenancy, the Housing Act 1988 requires you to use the prescribed Section 13 notice (Form 4) to unilaterally increase rent. A free-form letter won’t replace that notice if the tenant doesn’t consent.

For commercial leases, the mechanism is usually in the lease itself (for example, an “upward-only rent review” clause). A cover letter can start the process, but you still need to follow the exact steps and timelines set out in the lease.

When And How Can You Raise Rent In The UK?

Residential (England)

The route depends on the stage and type of tenancy:

• During a fixed term: You can only increase rent if the tenancy agreement includes a rent review clause that allows it, or the tenant agrees to a variation in writing. Otherwise, you wait until the fixed term ends.
• On a periodic tenancy (rolling month-to-month or weekly): You can propose a rent increase by agreement, or serve a Section 13 notice (Form 4). The notice period is generally at least one month for monthly tenancies, and the increase must be fair and realistic.

There are localised restrictions (for example, licensing or selective licensing conditions in some councils), and proposed changes to private rental rules continue to evolve. Always confirm current guidance before issuing notices.

Residential (Wales)

Different rules apply under the Renting Homes (Wales) Act 2016. Landlords use a notice under that regime (often six months’ notice and no more than once per year). If you rent in Wales, make sure you use the correct Welsh notice rather than a Section 13 form.

Commercial Leases (England & Wales)

Commercial rent increases are typically governed by the lease. Common mechanisms include:

• Scheduled rent reviews: Often every 3–5 years, with a defined method (market rent, index-linked) and a procedure for serving notices, negotiating, and referring to a third-party surveyor if needed.
• Turnover rent: Some retail and hospitality leases tie part of the rent to turnover, with regular adjustment calculations.
• Renewal negotiations: At lease expiry, the parties may agree a new rent as part of a renewal. Where the Landlord and Tenant Act 1954 applies (and isn’t contracted out), renewal processes and timelines are set by statute.

If your business lets commercial space (even a small unit or a room within your premises), a rent increase letter is most useful as a compliant cover letter that triggers a review under the lease and sets a constructive tone. If you’re unsure how the clause works, a quick Commercial Lease Review can help you map the steps and avoid missteps.

Sample Rent Increase Letter Templates You Can Adapt

Below are two adaptable, plain-English templates - one for residential (by agreement or to accompany a Section 13 notice) and one for commercial rent review. Use them as a starting point and tailor the details to your arrangement.

Residential: Rent Increase Agreement Template (By Consent)

Use this when you and your tenant agree to a new rent (during a fixed term with a valid review clause, or on a periodic tenancy). Both parties should sign and keep a copy.

Date: 

To: 
Property: 

Subject: Rent Increase Agreement

Dear ,

We write to confirm our agreement to vary the rent for the above property.

1. Current rent: £ per , payable on .
2. New rent: £ per .
3. Start date: The new rent takes effect from  (the "Effective Date").
4. Payment details: Rent will continue to be paid to .
5. No other changes: All other terms of your tenancy remain the same.

Please sign below to confirm your agreement. We will each keep a signed copy.

Signed by Landlord: ________________________  Date: ______________
Name: 
For and on behalf of: 

Signed by Tenant:   ________________________  Date: ______________
Name: 

Signed by Tenant:   ________________________  Date: ______________
Name: 

Notes:
- This agreement varies the rent by consent. If you have any questions, please contact .

Yours sincerely,

 | 

Important: If the tenant does not sign, and you are on a periodic tenancy in England, you should serve the prescribed Section 13 notice (Form 4). You can still include a cover letter like the one below to explain the context and reduce friction.

Residential: Cover Letter To Accompany A Section 13 Notice (Form 4)

Remember, the legally effective notice is the Section 13 Form 4 - the letter below is optional and for clarity only.

Date: 

To: 
Property: 

Subject: Proposed Rent Increase – Section 13 Notice Enclosed

Dear ,

We have enclosed a Section 13 notice proposing a new rent of £ per , effective from , for the above property. The notice complies with the required notice period for your periodic tenancy.

The proposed rent reflects . If you would like to discuss this, please contact us within  days. If we can reach agreement by consent, we can both sign a simple variation instead of relying on the statutory notice.

This letter is for information only; the enclosed Section 13 notice is the formal notice.

Kind regards,

 | 

Commercial: Rent Review Cover Letter (Under The Lease)

This template assumes your lease sets out a rent review date and a process for proposing a new rent. Always check the precise notice requirements (method of service, timing and content) in the lease.

Date: 

To: 
For the attention of: 
Premises: 
Lease date: 
Rent review date: 

Subject: Rent Review – Proposal For Revised Annual Rent

Dear ,

We refer to clause  of the lease regarding the rent review on . In accordance with that clause, we propose a revised annual rent of £ with effect from .

Basis: The proposed rent reflects , including . We enclose/exhibit .

Next steps: Please let us know your response within  days. If we are unable to agree, the lease provides for referral to  as set out in clause .

For the avoidance of doubt, this letter is served in accordance with clause  and section  of the lease.

Yours sincerely,

 | 
For and on behalf of 

Commercial rent reviews can be technical, especially where there are complex formulas or turnover elements. If you operate in hospitality and your tenant runs a venue, your rent provisions may tie into your restaurant lease fit-out, trading hours and use clauses, so take the time to cross-check what the lease actually permits.

Best Practice Steps Before You Send A Rent Increase

The right letter is only one piece - process and evidence are just as important. Here’s a practical checklist to follow before you hit “print”.

1) Check The Contract First

• Residential AST: Is there a rent review clause? Are you in a fixed term or periodic? Do you need to use a Section 13 Form 4? Is there any landlord licensing condition limiting increases?
• Commercial lease: What does the rent review clause say about timing, valuation method, notices, and dispute resolution? Are there assumptions/ignore clauses (e.g. disregarding tenant’s improvements)?

If anything is unclear, consider a short Commercial Lease Review to avoid serving a non-compliant notice. Small errors in service or timing can invalidate a review or delay your cash flow.

2) Prepare Fair, Evidence-Based Rationale

• Market comparables: Collect recent listings and agreed rents for similar properties nearby.
• Indexation: If your lease uses RPI/CPI, calculate the increase precisely and show your working.
• Cost basis (residential): Keep records of increased maintenance, insurance, and compliance costs.

Including a short summary in your letter can build goodwill and reduce pushback.

3) Give Adequate Notice (And Use The Right Method)

• Residential periodic (England): At least one month’s notice, using Section 13 Form 4.
• Commercial: Follow the lease: a specific months-before date, plus service rules (recorded delivery/hand delivery to the registered office, etc.).

Get proof of service. If the lease requires service at a registered office, double check the tenant’s Companies House record.

4) Offer A Constructive Path

Tenants are more likely to accept a fair increase when they feel heard. Consider offering:

• A short call to discuss comparables or indexation.
• A phased increase (for example, stepped rent over 6–12 months) recorded in a side letter.
• Flexibility on other terms (for instance, permission for limited subletting or minor alterations) if that helps the business manage the increase.

Where a tenant wants to transfer or exit instead of accepting an increase, you may instead negotiate terms for assigning a lease or a surrender.

5) Record The Outcome Properly

Once agreed, document the result in a short variation or side letter signed by both parties. For commercial leases with more complex changes, draft a deed of variation in line with the lease’s formalities. Good documentation now means fewer disputes later - just like you would with a landlord reference letter, clarity and accuracy matter.

Common Legal Traps To Avoid

Increasing rent is routine, but these mistakes can cost time and money.

Residential: Using The Wrong Notice Or Timing

• Wrong form: For periodic ASTs in England, a free-form letter isn’t a valid Section 13 notice. Use the prescribed Form 4 or secure a signed agreement by consent.
• Too soon: You generally can’t increase the rent more than once in a 12-month period via Section 13, and you must give at least a month’s notice (longer for yearly tenancies).
• Unfair or excessive increases: Tenants can challenge a Section 13 increase at the First-tier Tribunal if they believe it’s above market rent.

Commercial: Ignoring The Lease’s Review Mechanism

• Service missteps: Missing a review window or serving on the wrong address can derail the process.
• Wrong basis: If the lease says index-linked, you can’t switch to market comparables unless both parties agree.
• No evidence trail: A bare assertion invites dispute. Keep a file of comparables and calculations.

Rolling, Holding Over Or No Written Lease

If a commercial tenant is holding over after expiry, or you’re on rolling contracts, the dynamics change. You may be able to agree a new rent as a condition of continuing occupation or a short-term extension. Where there’s no written lease at all, your options are narrower and you’ll rely on implied terms and conduct - a risky place to be. In that scenario, clarifying terms in writing now will reduce the chance of a messy exit, just as you would before sending any formal termination letter.

Forgetting The Bigger Picture

Sometimes a rent increase discussion opens the door to wider changes that support the relationship and the property’s value. For example, you might agree on minor fit-out works and signage in parallel with the rent review, especially if the premises is a hospitality venue under a restaurant lease. Thinking holistically can help you secure a fair rent and a more valuable tenancy.

FAQs About Rent Increase Letters (For Small Landlords)

Do I Always Need The Tenant’s Signature?

No. On a periodic AST in England, you can serve a Section 13 notice (Form 4) to impose a new rent without a signature, subject to the tenant’s right to refer to the First-tier Tribunal. But getting a signed variation is often faster and friendlier.

Can I Increase Rent During A Fixed Term?

Only if your agreement permits it (a valid rent review clause) or the tenant agrees in writing. Otherwise, wait until the fixed term ends and agree a renewal at a higher rent or move to a periodic tenancy and serve the correct notice.

How Much Can I Increase The Rent?

There’s no hard statutory cap for private residential rents in England, but increases must be fair and realistic. For commercial leases, the lease wording and valuation mechanism apply. Excessive or poorly evidenced increases tend to lead to disputes - a constructive approach and clear evidence are your best tools.

What If The Tenant Won’t Agree?

For residential periodic ASTs in England, consider serving the Section 13 notice. For commercial leases, follow the review process in the lease - it typically includes negotiation and third-party determination if you can’t agree.

Should I Use Email Or Post?

Follow the service method in the tenancy/lease. Many commercial leases require service to a registered office by recorded delivery. If email is permitted, still consider sending hard copy and retaining proof of service.

Key Takeaways

• A “sample rent increase letter” is only part of the legal process - check whether you need a prescribed Section 13 notice (residential) or must follow a lease-based rent review procedure (commercial).
• For residential ASTs in England, use the Section 13 Form 4 for periodic tenancies unless you have a signed variation; during a fixed term, rely on a valid rent review clause or tenant consent.
• For commercial leases, the lease is king: serve notices exactly as it requires, evidence your valuation (market or index-linked), and keep to the timelines.
• Adopt a constructive approach: explain the basis for the increase, offer to discuss, and consider phased increases or complementary concessions where appropriate.
• Record the outcome in a signed variation or deed of variation - good documentation avoids disputes later and protects your income stream.
• If you’re dealing with holding over, rolling periods or complex review clauses, get tailored support - a short Commercial Lease Review can save a lot of back-and-forth and help you serve a compliant notice first time.

If you’d like help preparing a tailored rent increase agreement or reviewing your lease before you start a rent review, our team is here to help. You can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.