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Lease renewals: A building surveyor’s guide to avoiding costly dilapidations disputes

Lease renewals are often viewed as a legal and commercial exercise. Heads of terms are agreed, rents are negotiated and both parties focus on securing the right commercial outcome.
July 16, 2026
Builder inspection consultancy. Inspector checking material and structure in construction.
Lease renewals are often viewed as a legal and commercial exercise. Heads of terms are agreed, rents are negotiated and both parties focus on securing the right commercial outcome.

Yet some of the biggest financial risks rarely appear in those commercial discussions.

From a building surveyor’s perspective, it is often the technical detail hidden within leases, licences and historic property records that determines whether a lease renewal runs smoothly or ends in an expensive dispute.

As Holly Vos, Partner in Vail Williams’ Building Consultancy team, explains, seemingly minor omissions can create significant liabilities years later.

Thankfully, the good news is that many of these issues are entirely avoidable.

Having worked on lease renewals and dilapidations matters across a wide range of commercial properties, there are several recurring issues that can complicate matters – from alterations to buildings that have never been properly documented, to poor schedules of condition that leave you open to future liabilities.

Here are some of the most common technical issues that can create unnecessary cost and complexity during lease renewals.

Alterations that have never been properly documented

Over the life of a lease, tenants frequently adapt their premises to suit changing business needs. Internal layouts evolve, mechanical and electrical systems are upgraded and new fit-outs are installed.

Years later, however, nobody can be certain exactly what was altered, when it happened or whether reinstatement is required because the supporting paperwork is incomplete or missing.

Without clear licences for alterations, both landlords and tenants can find themselves arguing over who is responsible for reinstatement or repairs at lease expiry.

Poor schedules of condition

A schedule of condition should provide an accurate benchmark showing the commercial property’s condition when the lease began.

Unfortunately, many schedules are little more than a handful of poor-quality photographs with limited written commentary.

When a dispute arises years later, that lack of detail can make it far more difficult to establish whether any deterioration in a building’s condition has occurred during the tenancy or not.

A comprehensive schedule of condition should be carried out by a building surveyor and should include detailed written descriptions supported by high-resolution colour photographs and, where appropriate, evidence confirming the operational condition of building services.

Historic liabilities that disappear from view

One of the biggest mistakes made during lease renewals from a technical building surveying perspective, is failing to carry forward historic obligations.

If earlier leases or licences required alterations to be reinstated, those obligations should be clearly referenced within the new lease documentation.

If they are overlooked, landlords and occupiers can have very different expectations about what should be handed back at lease expiry, often leading to costly negotiations or formal dilapidations disputes.

Unclear repairing responsibilities

Another issue we see is ambiguity over who is responsible for repairing different elements of a building.

This is particularly common where responsibilities overlap between tenant repairing obligations, landlord responsibilities and service charge provisions.

Mechanical and electrical (M&E) services, windows and external elements can all become areas of dispute if the lease does not clearly define responsibility.

Ultimately, if a landlord wishes to pursue a dilapidations claim at lease expiry, they must be able to demonstrate their loss. So, clear documentation makes that process considerably easier.

Equally, poorly documented obligations can weaken a landlord’s position where issues of supersession arise, making it harder to recover the full cost of reinstatement works.

What does good lease documentation look like?

Good lease management begins long before lease expiry.

From a building consultancy perspective, robust documentation should include:

  1. Clearly defined commercial property demises within both the lease wording and lease plans, leaving no ambiguity over what is included.
  2. Comprehensive licences for alterations that include detailed descriptions of the works, existing and proposed layouts, mechanical and electrical changes, and supporting specifications.
  3. References to previous leases and historic licences within any new lease documentation, ensuring ongoing obligations remain clear.
  4. Detailed schedules of condition combining written descriptions with high-quality photographs and, where appropriate, testing or validation of building services.

The documents should accurately reflect what both parties intended. It sounds straightforward, but in practice these details are often overlooked until a dispute arises.

Why investors should look beyond the headline figures

These issues are equally important for investors acquiring commercial property.

When purchasing an investment, it is essential to understand exactly what obligations are being inherited.

  • Are tenant alterations properly documented?
  • Could reinstatement obligations affect future negotiations?
  • Do the lease documents support future dilapidations claims?
  • Is there sufficient evidence to demonstrate the property’s condition?

During a commercial property acquisition, technical due diligence should extend beyond the physical condition of the building.

Buyers should also review licences for alterations, repairing obligations, schedules of condition and historic reinstatement liabilities, all of which can affect future dilapidations claims and asset value.

Dilapidations and lease renewals go hand in hand

Overlooking these issues during acquisition can expose investors to unforeseen liabilities, reduce recoverable dilapidations claims and ultimately affect asset value and future income.

Every commercial property tells a different story

Whether it’s a 9,000 sq ft office with multiple fit-outs over a ten-year lease, a warehouse where alterations have accumulated over successive occupiers, or a large mixed-use leisure property that has been sublet and reconfigured several times, every building develops its own history.

The longer a lease has been in place, the more important it becomes to understand and document that history before entering renewal negotiations or preparing for lease expiry.

In our experience, many lease-end disputes can be avoided through proactive planning rather than reactive problem-solving.

At Vail Williams, our Building Consultancy team supports landlords, occupiers and investors throughout the lifecycle of commercial property, helping to reduce risk and protect value.

Our services include:

  • Pre-acquisition technical due diligence, helping purchasers understand the obligations and risks they are acquiring.
  • Reviewing and compiling licences for alterations, ensuring documentation is complete and readily accessible.
  • Preparing detailed schedules of condition, providing clear evidence that can help avoid disputes later in the lease term.

When it comes to lease renewals and dilapidations, success rarely hinges on a single clause or document. More often, it is the accumulation of small details that determines whether negotiations proceed smoothly or become costly disputes.

As building surveyors, our role is to ensure those details are identified, understood and properly documented before they become a problem. Because when it comes to protecting commercial property value, the detail really does matter.

Whether you are a landlord preparing for lease expiry, a tenant negotiating a lease renewal or an investor acquiring commercial property, early technical advice can significantly reduce future liabilities.

Our Building Consultancy team works with clients across the UK to provide practical advice on lease renewals, dilapidations, schedules of condition, licences for alterations and technical due diligence.