Commercial property rent reviews: how they work and why they matter

A rent review is the mechanism in a commercial lease for resetting the rent partway through the term, so that a lease signed years ago does not leave the landlord stuck on yesterday's rent for the whole period. At each review the rent is recalculated on an agreed basis, the open market or an index, and usually steps up to the new level for the next stretch of the term. For an industrial investor, rent reviews are the moments at which the rental growth in the wider market is actually converted into the rent roll, which makes them central to both the return on an asset and its value.

This guide explains what a rent review is, why almost all UK commercial reviews are upward-only, the difference between open market and index-linked reviews, how the review process and its costs work, what to watch in a review clause, and why reviews matter so much to value and to lenders. We arrange finance for industrial investors and owner-occupiers as a broker and introducer, not a lender, and nothing here is legal or valuation advice; the wording of a specific lease is a question for a solicitor and a surveyor.

What is a commercial rent review?

A rent review is a contractual point in a commercial lease at which the rent payable is reassessed and, if the basis allows, changed for the remainder of the term or until the next review. The mechanism exists because commercial leases are long, often ten, fifteen or twenty years, and a fixed rent for the whole term would soon fall out of step with the market. Reviews bridge that gap by re-setting the rent at intervals, most commonly every five years, so the landlord shares in rising rents and the tenant pays a rent that bears some relation to current values.

The lease sets everything about the review: when it happens, the review pattern, on what basis the new rent is calculated, the assumptions and disregards the valuer must apply, and the procedure for agreeing or determining the figure. None of this is left to general law or goodwill; it is all in the rent review clause, which is one of the most heavily negotiated and litigated parts of any commercial lease precisely because so much money turns on its wording over the life of the term.

For the tenant, a review is a cost event to budget for: the rent may step up, sometimes sharply if the market has run, and the business needs to plan for it. For the landlord and any lender behind the loan, a review is an opportunity to capture rental growth that has built up in the market but not yet reached the rent roll, the reversion. The same reversion that buyers pay for when pricing a let estate is realised, lease by lease, at each review.

What is an upward-only rent review?

An upward-only rent review is one where, at the review, the rent can rise to the new market or indexed level or stay where it is, but cannot fall, even if rents in the market have dropped since the lease was signed. It is the dominant form in UK commercial leases and is the single feature that makes commercial property income so attractive to investors and lenders: the rent ratchets upward over the term and is protected against falling, which gives the income a one-way, growing quality that residential and many overseas commercial leases lack.

That protection is exactly why upward-only reviews are valued and, equally, why they are controversial. Tenants and their representatives have long argued that upward-only reviews are unfair in a falling market, leaving a business paying an above-market rent it cannot reduce, and the structure has periodically been the subject of reform debate. As things stand it remains standard practice in England and Wales, but the direction of policy is worth watching, and any investor should treat the durability of upward-only income as a feature of the current market rather than a permanent law of nature.

From the investor's seat, the practical consequence is that an upward-only review turns market rental growth into a durable uplift in the rent roll. From the tenant's seat, it is a reason to negotiate the basis and any cap carefully at the outset, because the rent agreed today sets a floor that will only ever rise. Both sides, in other words, have every incentive to get the review clause right when the lease is first granted.

Open market versus index-linked rent reviews

The two main bases for a review answer the same question, what should the rent be now, in very different ways. An open market rent review resets the rent to the figure the unit would command if let on the open market at the review date, assessed by reference to comparable lettings of similar industrial units in the area, with the lease's assumptions and disregards applied. It tracks the real letting market closely, which means it captures genuine rental growth, but it can also be contentious, because the parties may disagree on the comparable evidence and the right figure.

An index-linked review ties the rent to a published index, usually the Retail Prices Index or the Consumer Prices Index, so the rent moves by the change in that index since the last review rather than by reference to comparable lettings. Index reviews are mechanical and predictable, which both sides value, but they can drift away from actual rental values: in a period where market rents rise faster than inflation the landlord loses out, and where inflation outruns rents the tenant overpays. To contain that, index reviews are often capped and collared, with a maximum and minimum annual uplift agreed in the clause.

Which basis suits depends on the lease and the parties. Open market reviews dominate conventional industrial lettings; index-linked reviews are common on long institutional leases and on the leases created by a sale and leaseback, where the investor wants predictable, contractual growth rather than the uncertainty of market valuation. The choice feeds directly into how the asset is valued and financed, because lenders read predictable indexed income differently from market-reviewed income.

How does the rent review process work, and what does it cost?

The process is driven by the lease and, increasingly, runs to a defined timetable. Typically one party, usually the landlord, serves a notice proposing the new rent; the other party responds; and the two sides, normally through surveyors, negotiate towards an agreed figure using comparable evidence for an open market review or the index movement for an indexed one. Most reviews settle by agreement. Time limits in the clause matter, and whether time is of the essence can decide whether a missed deadline costs a party its position, which is one reason professional advice is sensible even on an apparently routine review.

Where the parties cannot agree an open market review, the lease provides for an independent third party to determine the figure, either an arbitrator or an independent expert, appointed by agreement or, failing that, by the president of the RICS on application. An arbitrator decides on the evidence and submissions the parties put forward; an independent expert can use their own knowledge and investigation. Either route reaches a binding figure, but both take time and cost money, which is why most parties prefer to settle.

1. Notice

   A party, usually the landlord, serves a rent review notice proposing the new rent under the lease's procedure and timetable.

2. Negotiation

   Surveyors for each side exchange and debate comparable evidence (open market) or apply the index movement (indexed) to reach a figure.

3. Agreement or referral

   Most reviews settle by agreement; if not, the lease refers the dispute to an arbitrator or independent expert.

4. Determination and back-rent

   The agreed or determined rent applies from the review date, so any uplift is usually backdated, with interest where the lease provides.

On cost, a straightforward agreed review mainly costs the surveyors' fees for advising and negotiating, modest relative to the sums at stake. A referral to arbitration or expert determination adds the third party's fees and each side's professional costs, which can be significant, so the economics of pushing a marginal point to determination need weighing. The other cost to plan for is the backdated rent: because the new rent usually applies from the review date even if agreed months later, a tenant can face a lump sum of back-rent, sometimes with interest, when a review finally settles.

Why do rent reviews matter to value and to lenders?

Rent reviews are where the rental growth that drives the whole sector becomes real money. The market has been growing: UK all-industrial rental growth ran at 4.65 percent in the twelve months to February 2026 on the Knight Frank MSCI-basis series, with JLL putting prime headline growth at 4.7 percent over the year to Q4 2025, and Savills forecasting a further 2.7 percent for 2026 in its Big Shed Prospects 2026 (Knight Frank, UK Logistics Market Update March 2026; Savills, 2026). None of that reaches a landlord's income automatically; it reaches it at reviews, when leases signed at lower rents are reset upward. The review is the conversion point from market growth to collected rent.

Because value is rent capitalised at a yield, a review that lifts the rent lifts the value, all else equal, and an estate with imminent reviews on under-rented leases carries reversion that a buyer will pay for. The pattern and timing of reviews therefore feeds straight into how an asset is priced, the equivalent and reversionary yields explained in our guide to industrial property yields. A unit let well below market with a review due next year is worth more than the same unit with seven years to run before its rent can move.

Lenders read reviews the same way, from the debt side. Income that is contracted to grow, whether through evidenced reversion at open market review or through index-linked uplifts, strengthens the interest cover position over the life of the loan and can support more debt or finer terms, particularly on a refinance after reviews have lifted the rent roll. This is also why captured reviews are often the trigger to release equity: once a review has banked the uplift, the higher rent supports a larger facility against the now more valuable asset, a play we set out in our guide to refinancing to release equity. We model that review-driven income across our panel through our portfolio finance. Lending figures are indicative until terms are issued, and most such lending is unregulated unless a home is taken as security.