October 19, 2026

PACT arbitration in commercial lease renewals

What does PACT stand for?

PACT stands for Professional Arbitration on Court Terms.

What is it?

PACT is a form of alternative dispute resolution that can be used to resolve disputes between landlords and tenants in a commercial lease renewal under the Landlord and Tenant Act 1954 (“LTA 1954”).

It was established by the Law Society and the Royal Institute of Chartered Surveyors (RICS) to help the parties to a lease renewal to obtain a determination on the terms of the renewal lease upon which they can’t agree by a third party professional, rather than having to go to a contested trial at court. It is a flexible, reliable, and cost-effective way of resolving disputes of this nature.

What issues can be resolved by PACT?

PACT can be used to resolve almost any type of dispute that arises in a commercial lease renewal under the LTA 1954.
It is typically used to determine key terms of the renewal lease, such as the period that it should be granted for and the rent that is to be paid under it.
The following is a non-exhaustive list of issues that could be determined via PACT where the parties can’t reach agreement upon them:

  • The duration of the new lease
  • The annual rent to be paid
  • The level of any interim rent that is to be paid
  • Repairing obligations
  • Service charge obligations and payment
  • Alienation provisions
  • The inclusion of any break clauses
  • Any other terms of the new lease
  • The wording that is to be used for a clause of the new lease

It is difficult to think of a dispute in a commercial lease renewal that could not be resolved via PACT.

What about when a landlord opposes renewal?

Under the LTA 1954 a landlord can oppose the grant of a new lease to its tenant in certain circumstances – see our article on that HERE. PACT can also be used to determine whether the landlord has any grounds to oppose, which can save the parties a lot of time and cost.

At what stage can PACT be used?

PACT can be used to resolve a disputes either:

  • Pre-Action – before lease renewal proceedings have been issued; or
  • Post-Action – during the course of a lease renewal claim.

PACT is voluntary

PACT is a voluntary regime.

Neither party can force the other to take part in it, and the courts can’t order the parties to do that either. The courts encourage parties to try to settle their differences without the need to go to trial. A party that has refused to agree to a proposal to use PACT may potentially find the court taking a dim view against it when it comes to costs liability.

How does PACT work?

In broad terms, PACT works as follows:

  • The process begins by one party proposing to the other that the points that they can’t agree upon be referred for determination via PACT rather than by the court.
  • If that is agreed by the other party, they will then try to agree upon an appropriate third-party professional to make the determination required.
  • That person will be instructed to act as either an arbitrator or an independent expert, which we’ll discuss further below.
  • If they can’t agree upon an appropriate third party the parties may apply to the president of the RICS to identify one for them.
  • The third party’s fee will be agreed, and usually shared.
  • The parties will then prepare instructions to the third party.
  • If the referral to PACT is being made pre-action, the parties will enter into a written agreement setting out instructions to the third party on what they require a determination upon.
  • If the referral to PACT is being made post-action, the parties will enter into and file at court a consent order to stay the proceedings to accommodate the referral, usually with a schedule attached to it setting out instructions to the third party on what they require a determination upon.
  • The third party will then issue a direction timetable to the parties setting out the steps that they require each party to take to put the third party in a position to make a determination.
  • That could include the parties providing written statements or expert evidence.
  • The third party will then consider the information provided before making a determination on the issue(s) in dispute.
  • The determination is likely to deal with costs liability as well – i.e. whether one party should pay the others costs of the process, or a proportion of them.
  • The determination is binding, so once received the parties will complete the new lease on the terms set out by the third party (unless the tenant no longer wants to take a new lease), or refer determination of any other issues that the third party was not instructed to deal with to court.
  • If one party won’t complete the new lease on the terms determined, the other can apply to court for an order for it to be granted.

Property disputes team awards

Who is the third party?

The third party appointed to make a determination under PACT will usually be an experienced RICS chartered surveyor with detailed knowledge of the commercial lease renewal process and the property market where the premises subject to the dispute are located.

The parties could also choose to appoint a lawyer, although that is far less common. The third party can be appointed as either an arbitrator or independent expert.

Draft lease

In most cases it is likely that the parties will provide the third party with a draft lease that is already in agreed form, save for the issues that they have sought determination on. That is because they have probably followed the lease renewal process as far as they can – which involves the production and negotiation of the draft lease – and have now reached an impasse over a few key terms.

Determination is binding

As the phrase “on court terms” suggests, the determination of the third party on the issues referred to them is legally binding. The parties will therefore have to abide by the third party’s decision, and there is only a very limited right of appeal.

Arbitrator v Independent Expert

As set out above, under PACT, the third party can be appointed to act as either an Arbitrator or as an Independent Expert
We’ve summarised the key differences between the two below:

  • Arbitrators can only base their determination upon the evidence and arguments submitted to them by the parties. Independent Experts in the other hand are instead required to carry out their own investigations to find the information and evidence required to make their determination.
  • Disclosure of key documents can be forced in arbitration, whereas an Independent Expert does not have similar powers.
  • There is a very limited ability to appeal the decision of an Arbitrator whereas there is no right to appeal the decision of an Independent Expert.

Which to choose will depend upon the parties’ preference and negotiations.
In practice the third party is usually appointed as an Arbitrator however as in that scenario the parties can control the arguments and evidence that the third party considers in support of their position.

PACT in practice

In practice, PACT is often proposed after the schedule of unagreed terms has been filed at court – for more information on that see our article on the post issue stages of a lease renewal HERE.

At that point there is usually an agreed form lease apart from a few outstanding points that the parties can’t agree on. These are usually the annual rent and the length of the term. The third party will consider the evidence submitted by the parties and their valuation experts in support of their positions before making a determination on these points. The valuation experts will have prepared reports on what they believe the annual rent should be having regard to comparable evidence in the local area, just as they would in a court based lease renewal.

The third party will determine the length of term first, which will give them with a lease in which everything is agreed apart from the rent. They will then be in a position to make a determination on that also. They will then deal with any interim rent that they’ve been asked to determine – see our article on interim rent HERE for more details – before making a determination on costs if their instruction provides for that.

The benefits of PACT

PACT is paper based

PACT is a paper based procedure, meaning that the entire process is dealt with via written submissions.

There is no need for the parties to attend hearings or a trial, no need to go through the laborious process of trying to find dates where everyone involved can be available, and no need to instruct advocates to make verbal submissions on one’s behalf.

PACT is Flexible

The structure of the process and the timetable that the parties must adhere too is completely up to them.

They can agree it between themselves rather than have what are sometimes quite onerous obligations imposed upon them by the courts.

PACT is Quick

Where the parties and their professional advisors are proactive, and if the third party has good availability, PACT can be a very quick way to achieve determination on a point or points that they parties can’t agree upon.

In some cases that can be as little as a few months, as opposed to up to say two years for a determination at trial in a court based lease renewal.

PACT is Cheap

The cumulative effect of the preceding points results in a process that is considerably more cost effective than pursuing a determination through the courts.

With PACT, many of the interim procedural requirements of the court process are stripped away, leaving a much more streamlined process that inevitably costs less to comply with.

PACT is Reliable

A further benefit of the PACT regime is that the parties have the reassurance that the person making the determination is a highly experienced professional with deep expert knowledge in their field.

Consequently, they can be confident in the third party’s ability to understand the key issues and in the decision they reach in relation to them.

How we help

As there are so many benefits to using the PACT procedure, we recommend to all of our clients that they consider using it where there is a genuine dispute about a key provision of a renewal lease and a resolution without court intervention looks unlikely.

We often suggest including the obligation to consider it within the court directions when lease renewal proceedings have been issued.

If PACT is agreed we take care of all of the paperwork. We help our clients to identify an appropriate professional to handle the determination, and we work with them, their valuers and lease advisory professionals to ensure that the arguments and evidence put to the third party are as strong as possible to give them the best chance of achieving what they want.

Further resources

For an in-depth look at some of the other key issues that arise in commercial lease renewals, please see our detailed guides below on:

  • An overview of the commercial lease renewal process

    where we summarise in one handy guide everything that commercial landlords and tenants need to know about this process.

  • The initial stages of the commercial lease renewal process

    where we look at everything from initial strategies to service of notices and issuing an application at court for a new lease.

  • The post issue stages of the commercial lease renewal process

    where we look at every stage of the court process from service of the claim to witness statements, experts reports and trial.

  • The court’s approach to unopposed lease renewals

    on how the courts determine the terms of a new tenancy where the parties are unable to agree them.

  • Interim rent applications

    where we look at what interim rent is, how it is calculated and when to apply for it to be determined.

  • Opposing the grant of a new tenancy

    where we look at the seven grounds upon which a landlord can reply to oppose the grant a new lease to a tenant.

Learn more about the team:

Read more about Ian McEwan

Paula Green

Partner | Hospitality & Leisure sector lead/ Retail sector
Read more about Paula Green
Read more about David Benjamin
Read more about Scarlett Doyle
Read more about Leanne Bowler
Read more about Annabel Riekie

Stephanie Garnett

Chartered Legal Executive Litigator
Read more about Stephanie Garnett

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