A Practical Guide to the Rent Review Process

A rent review can materially affect the cost of occupying a business premises or the income produced by an investment. Yet the outcome is rarely decided by a single asking rent or a quick look at online listings. This guide to the rent review process explains how commercial rent reviews work, what both landlords and tenants should check, and where informed professional advice can make a practical difference.

What is a commercial rent review?

A rent review is the mechanism in a commercial lease that adjusts the rent during the term. It is distinct from a lease renewal: the existing lease continues, but the rent changes in accordance with the review clause.

Reviews are commonly scheduled every three or five years. The wording of the lease controls the process, including the review date, the valuation assumptions, the disregards and the method used to resolve a disagreement. It is therefore never safe to assume that two apparently similar leases will produce the same result.

For a landlord, a review is an opportunity to maintain rental income in line with the market or an agreed index. For a tenant, it is a point at which occupation costs should be tested against comparable evidence and the actual terms of the lease. Good preparation allows both parties to negotiate from a clear, evidenced position rather than from expectation alone.

Start with the rent review clause

The lease should be read in full before either party proposes a figure. The rent review clause may look technical, but small details can have a significant financial impact over the remainder of the term.

First, establish the review date and any notice requirements. Some leases set a clear timetable for notices, counter-notices and supporting information. Others allow a review to be triggered after the stated date. Missing a deadline may not always prevent a review, but it can affect procedure, leverage and cash flow. The specific wording needs careful consideration.

Next, identify the review basis. The most common approaches are open market rent, index-linked review, fixed or stepped increases, and occasionally turnover-based arrangements. An open market review assesses the rent that the property could reasonably command at the review date on the lease assumptions. An index-linked review applies a stated measure, often with caps, collars or compounding provisions. A stepped review is more predictable, but its commercial effect still depends on the agreed figures.

Many traditional commercial leases contain an upward-only provision. In that case, even if market evidence has softened, the reviewed rent may not fall below the existing rent. That can be commercially challenging for a tenant and is one reason why the clause should be understood before terms are agreed at the start of a lease.

Assumptions and disregards change the valuation

For open market reviews, the clause commonly requires the valuer to make assumptions. These may include that the property is available to let in the open market, that the tenant has complied with lease covenants, or that specified consents have been obtained.

The clause may also require certain matters to be disregarded. A tenant’s improvements, goodwill or occupation may be ignored in whole or in part. Equally, an onerous tenant obligation or unusual restriction in the lease may need to be reflected. The purpose is to create a defined hypothetical letting, but the detail determines the valuation exercise.

This is where generic rental evidence can be misleading. A comparable transaction is only genuinely comparable if its lease length, break options, repair obligations, incentives, specification, location and timing are properly analysed.

Build evidence before putting forward a figure

The strength of an open market rent argument lies in its evidence. Landlords and tenants should gather relevant transactions well in advance of the review date where possible, particularly in smaller local markets where evidence may be limited.

A useful assessment considers completed lettings rather than simply advertised rents. Quoting rents can provide market context, but they do not reveal agreed incentives, rent-free periods, fitting-out contributions, side agreements or changes made before completion. Those details may substantially alter the effective rent.

The property itself must then be compared fairly. A modern unit with parking, loading access and a strong roadside profile may not be comparable with an older building nearby. For offices, factors such as floorplate, natural light, air conditioning, energy performance, parking allocation and accessibility can all influence demand. Retail and leisure premises require close attention to footfall, frontage, catchment and trading potential.

In Colchester and the surrounding Essex market, local knowledge can be especially valuable because demand can vary between town-centre, business park, industrial estate and edge-of-town locations. The most persuasive evidence is not necessarily the closest transaction. It is the evidence that best reflects the hypothetical letting required by the lease.

Follow the notice and timetable requirements

Once the clause and evidence have been reviewed, the formal process begins. A landlord may serve a rent review notice stating the proposed rent and the basis for it. A tenant may respond by accepting the proposal, making a counter-proposal or requesting further supporting evidence, depending on the lease procedure.

The notice should be checked for the correct parties, property description, service method and timing. Formal notices should not be treated as routine correspondence. A notice sent to the wrong address or served in a method not permitted by the lease can create avoidable disputes.

It is also sensible to distinguish between the review date and the date when the figure is agreed. Negotiations and expert determinations can continue beyond the review date, particularly where the market evidence is contested. The lease may provide for backdated payment once the reviewed rent is settled, often with interest. Both parties should plan for that potential liability or receipt rather than allowing it to become a surprise.

Negotiate the rent, not just the headline figure

A well-managed negotiation is not a contest of unsupported opinions. Each party should set out a reasoned valuation case, explain the treatment of comparable evidence and address the assumptions in the lease.

For landlords, that means being realistic about incentives and the condition in which a new occupier would take the premises. For tenants, it means recognising valuable lease features, such as a long unexpired term or limited landlord obligations, where they are relevant to rental value. A low comparable rent may carry little weight if it involved a superior incentive package or a short, flexible lease.

Where the parties are close, commercial agreement is often preferable to a protracted formal dispute. It provides certainty and avoids additional professional costs. However, settling too quickly can be costly where the evidence has not been properly tested. The appropriate approach depends on the difference in value, the clarity of the clause, the quality of evidence and the importance of the premises to the occupier or investment strategy.

What happens if no agreement is reached?

Most commercial leases include a dispute-resolution route, commonly referral to an independent expert or an arbitrator. The distinction matters.

An independent expert generally uses their own expertise and may take account of information beyond the parties’ submissions, subject to the lease and appointment terms. An arbitrator acts more like a tribunal, deciding between the cases presented under a formal process. The clause will usually specify the appointing body or the procedure for selecting an individual if the parties cannot agree.

Formal determination can provide a clear result, but it carries cost, delay and risk. The eventual figure may be different from either party’s preferred position. Before referral, it is worth reviewing whether a without-prejudice settlement discussion, an agreed timetable for evidence, or a jointly appointed surveyor could bring the matter to a proportionate conclusion.

When to seek professional advice

Early advice is particularly valuable where the lease wording is unusual, the rent is material to the business or investment, comparable evidence is sparse, or a notice deadline is approaching. A chartered surveyor can interpret the valuation issues, assess market evidence and negotiate a reasoned position. A solicitor should advise on lease construction, notice validity and legal procedure where needed.

For landlords with several properties, a consistent review strategy can help protect income while preserving constructive occupier relationships. For tenants, obtaining advice before responding to a proposed increase can prevent an unsupported figure becoming the starting point for the entire negotiation.

The most helpful next step is usually straightforward: take out the lease, identify the review date and clause, and assess the evidence early. A rent review is easier to manage when neither party is working against the clock.