Solicitors for rent review services – expert representation in commercial rent reviews, from open market valuations and indexed adjustments to turnover-based calculations and contested determinations across England and Wales

An expert determination is typically quicker, cheaper, and less formal than an arbitration. The expert — usually a chartered surveyor — investigates the matter and reaches a decision that is final and binding in the absence of manifest error or fraud. There is no right of appeal, and the expert is not obliged to give reasons unless the lease requires it. An arbitration is governed by the Arbitration Act 1996: the process is more formal, the arbitrator must give reasons, and the award can be challenged on grounds of serious irregularity or on a point of law. An expert determination is generally better for straightforward valuation disputes where speed and cost are priorities. An arbitration may be preferable where the dispute involves complex legal issues — such as the interpretation of the rent review clause — that would benefit from a reasoned decision and the possibility of challenge. Our solicitors for rent review services advise on the most appropriate forum for each specific dispute, taking into account the sums at stake, the complexity of the issues, and the client's appetite for finality.

Generally, no. A rent review that has been agreed between the parties or determined by an expert or arbitrator is final. An agreed review recorded in a memorandum of rent review is a contract, and it will bind the parties unless it can be set aside on contractual grounds such as mistake or misrepresentation — which is rare and difficult to establish. An expert's determination can only be challenged on the grounds of manifest error, which is a very high threshold: the error must be obvious on the face of the determination, not merely arguable. An arbitrator's award can be challenged under sections 67 to 69 of the Arbitration Act 1996 — on grounds of lack of jurisdiction, serious irregularity, or on a point of law — but only with the court's permission and within strict time limits. The best protection against an unfavourable determination is to be well represented at the time. Our solicitors for rent review services ensure that no argument is left unmade and no evidence is omitted.

It depends on the drafting of the rent review clause. If the lease states that the review must be triggered within a specified period and that time is of the essence, the landlord's right to review the rent may be lost permanently — meaning the rent remains at the existing level until the next review date, or even for the remainder of the term. If the lease is silent on whether time is of the essence, the courts have held that the presumption is that it is not — and the landlord can trigger the review late, though the backdated arrears will only accrue from the date of the notice rather than the review date. The case law on this point is nuanced, and the outcome depends on the precise wording of the clause. Our lease due diligence service identifies time-limit risks before they become problems, and our lease legal audits ensure that rent review dates are diarised across the portfolio.

Most well-drafted rent review clauses contain a disregard for improvements carried out by the tenant — meaning that the hypothetical letting assumes the premises are in their unimproved state, and the rent is assessed accordingly. The rationale is that the tenant should not be required to pay rent on the value it has itself created. However, the scope of the disregard varies significantly between leases. Some clauses disregard all improvements, whenever carried out. Others disregard only improvements carried out during the term — not those carried out by a previous tenant or by the current tenant before the lease was granted. Some disregard improvements that the tenant was obliged to carry out under the lease. And some clauses have time limits: improvements carried out more than, say, 21 years before the review date are taken into account. Our solicitors for rent review services analyse the precise wording of the disregard and deploy the relevant case law to argue for the interpretation that most favours the client — whether landlord or tenant. For tenants facing a review, our commercial tenant advice service provides a comprehensive assessment of the review position.

Only if the lease permits it. The majority of commercial leases — particularly those granted before the late 1990s — contain upward-only rent review provisions, meaning the reviewed rent cannot fall below the passing rent. If the open market rent at the review date is lower than the passing rent, the rent stays where it is. This can create a significant problem for tenants in a falling market: they are locked into a rent above market levels, which can make assignment or subletting difficult and may affect the viability of the business. Modern leases — particularly those granted since the RICS Code for Leasing Business Premises was introduced — are more likely to permit downward reviews, but they remain the exception rather than the rule. Our lease exit options service advises tenants on strategies for managing an above-market rent, and our lease negotiation for tenants service ensures that downward review provisions are considered at the grant stage.

The cost of a negotiated rent review — solicitor's fees and surveyor's valuation advice — is typically modest relative to the sums at stake, usually a few thousand pounds. If the review goes to expert determination or arbitration, costs increase: the expert or arbitrator charges a fee (usually apportioned between the parties as the expert or arbitrator directs, or equally in the absence of direction), and the parties bear their own costs of representation. The total cost of a contested third-party determination can range from £5,000 to £25,000 or more, depending on the complexity. As a general rule, each party bears its own costs of the review process unless the lease specifies otherwise — unlike litigation, where the court can award costs against the unsuccessful party. This means that the cost-risk calculus of a rent review is different from that of litigation: there is less deterrent to the weaker party running a marginal argument. Our solicitors for rent review services provide transparent costs estimates from the outset and advise on proportionality. Our lease risk assessment service helps clients evaluate the commercial sense of pursuing or resisting a review before costs are incurred.