← All guides

Guide

Lease escalation clauses that survive a dispute

Escalation is the clause nobody argues about at signature and everybody argues about in year three. It is also one of the few clauses a court will strike out entirely if it is drafted badly — not read down, not adjusted, struck out. Here is what the Rental Housing Act requires an escalation clause to say, the drafting failure that makes one unenforceable, and why the arithmetic matters more than the percentage.

What the Act requires you to write down

The Rental Housing Act 50 of 1999 does not require a lease to be in writing at all — section 5(1) says so, and section 5(2) adds that a landlord must reduce the lease to writing if the tenant asks. In practice every agency works from a written lease, and once a lease is written, section 5(6) prescribes what it must contain.

The relevant paragraph is section 5(6)(c): the lease must state the amount of rental of the dwelling and reasonable escalation, if any, to be paid in terms of the lease. Two phrases do the work. If any means escalation is not compulsory — a lease with no escalation is a perfectly lawful lease. Reasonable is the harder one: the Act does not define it, set a ceiling, or tie it to any published rate. Anyone who tells you there is a statutory maximum escalation percentage is inventing it.

What the paragraph does establish is that escalation must be written down in a form that can be checked. An escalation the tenant cannot calculate from the face of the lease is in trouble before anyone argues about whether it is reasonable.

The clause that fails is the one nobody can calculate

In Shepherd Real Estate Investments (Pty) Ltd v Roux Le Roux Motors CC 2020 (2) SA 419 (SCA), a lease gave the tenant renewal options at a rental that "shall be mutually agreed upon in writing". The parties deadlocked at the second renewal. The Supreme Court of Appeal held the renewal clause void for vagueness and granted ejectment, rejecting the argument that the lease's arbitration clause supplied a deadlock-breaker — it could not, because it fell away with the expired agreement.

That was a commercial lease, but the principle is ordinary contract law and applies to a residential lease with the same force. A term that requires the parties to agree again in future, with no mechanism that produces an answer if they do not, is not a term a court will complete for them.

The test is blunt: could a stranger holding the lease and a calculator produce next year's rent to the cent? If not, the clause is a liability. Wording that routinely fails: escalation "at market-related rates", "at the landlord's discretion", "in line with the landlord's increased costs", or "as agreed between the parties at each anniversary". Each requires a second conversation the clause cannot guarantee will end.

CPI-linked or a fixed percentage

A fixed percentage is certain. Both parties know every future rent at signature and there is nothing to dispute. Its weakness is that it is a bet on inflation made years in advance, by both sides.

A CPI-linked escalation tracks reality, but only if drafted with precision, and this is where most indexed clauses go wrong. Statistics South Africa publishes guidance on using its indices for escalation, and it makes three points worth heeding. There is more than one index, so the contract must name the one it means — "CPI" alone is usually read as the headline all-items CPI for all urban areas, but "usually read as" is not a drafting standard. The base period must be identified. And the indices are published in the month following the reference period, so the clause has to say which published figure it uses. Stats SA also states plainly that it does not advise on contracts or assist with disputes about interpreting them; if your clause is ambiguous, there is no referee to call.

One piece of context makes the default rate worth revisiting rather than inheriting. On 12 November 2025 National Treasury and the South African Reserve Bank announced a new inflation target of 3%, with a one percentage point tolerance band, replacing the previous 3% to 6% range, to be implemented over roughly two years. A fixed escalation chosen when the target midpoint was 4.5% is a materially different bargain against a 3% anchor. That is not an argument for indexing or against it — it is an argument for looking at the number in your lease template.

Compounding is where the argument actually starts

Escalation almost always compounds: each year's increase applies to the previous year's escalated rent, not to the original. Tenants who have only seen the percentage are often surprised by the total, and that surprise turns a renewal into a dispute.

The arithmetic is worth having in front of you. A rent of R10 000 escalating at 8% a year is about R13 605 in the fifth year and about R19 990 in the tenth — it roughly doubles inside a decade. The same rent at 5% is about R12 155 in the fifth year and about R15 513 in the tenth — three percentage points on paper, about R4 500 a month by year ten. None of it is hidden, but it is invisible unless somebody multiplies.

Two mechanical details cause more disputes than the rate does. The first is the anniversary: a clause that escalates "annually" without naming a date leaves open whether it runs from commencement, from occupation, or from a calendar date. The second is scope: whether escalation applies to rent only, or also to parking, levies and other recoveries. A clause silent on either is one each party will read in its own favour.

What the Consumer Protection Act does to a long schedule

The Consumer Protection Act 68 of 2008 applies to a lease where the landlord lets in the ordinary course of business and the tenant is a consumer — any natural person, and a juristic person below the R2 million asset or turnover threshold. Where it applies, section 14 caps a fixed term at 24 months unless a longer period is expressly agreed and the landlord can show a demonstrable financial benefit to the tenant, and it lets the tenant cancel on 20 business days' written notice, subject to a reasonable cancellation penalty.

The consequence is that a ten-year compounding schedule in a residential lease is largely theatre. In the consumer market, escalation is a renewal conversation held every year or two, and the clause's job is to be defensible over that horizon rather than to project a decade.

Above the threshold the position differs, and the courts have recently said so. In Dr Darren Levin Inc and Another v Promenade Centre (Pty) Ltd [2026] ZASCA 70, decided on 13 May 2026, a landlord required a prospective tenant to incorporate before signing a ten-year lease. The SCA held the tenant company, with assets or turnover above R2 million, was a large juristic person outside the Act's protection, and that parties may arrange their commercial affairs so that legislation does not apply to them. If you let commercial space, knowing which side of that threshold a tenant sits on tells you which escalation regime you are drafting under.

What a clause that holds up looks like

The clauses that survive share a few features. They state the escalation as a number or a named, published index. If indexed, they identify the exact index, the base period, and which published figure applies given the publication lag. They name the anniversary date. They say what the escalation applies to. They contain no step requiring the parties to agree again. They sit inside a lease term that is lawful for that category of tenant. And the figure is one you would be comfortable defending as reasonable, because section 5(6)(c) uses that word and nobody has told you in advance what it means.

Where a lease is long, where a tenant sits near the juristic-person threshold, or where you are departing from your standard template, that is work for an attorney. The cost of the opinion is trivial against a clause that turns out to be unenforceable at renewal.

To see what a given rate does across a full lease term before you commit to it, our free rental escalation calculator shows the schedule year by year.