Securing the right workspace is a major consideration for any business. For many, subleasing office space offers a flexible and cost-effective solution, particularly for start-ups, companies scaling down, or those seeking temporary premises.
However, while subleasing may seem straightforward, it often comes with hidden legal and contractual complexities that can quickly turn into costly problems if not handled carefully.
Too often, businesses rush into agreements without fully understanding their obligations, leading to disputes, financial penalties, or even eviction. Recognising the subleasing office space mistakes most commonly made can help organisations avoid these pitfalls and protect their interests.
Subleasing is particularly attractive for start-ups seeking flexibility, growing businesses needing extra space, or established companies looking to downsize. Yet without careful planning, the arrangement can expose parties to risks relating to lease compliance, contractual obligations, and landlord approval.
A well-drafted sublease agreement, supported by legal guidance, ensures that the arrangement is not only beneficial but also enforceable and secure.
Overlooking the Head Lease Agreement
One of the most frequent mistakes is failing to review the original lease between the landlord and the tenant. The head lease often contains restrictions on subletting, conditions that must be met, or specific approval processes.
If the sublease conflicts with these terms, the landlord may have grounds to terminate both the tenant’s lease and the sublease, leaving the subtenant without legal recourse. Before signing any sublease, it is vital to ensure it aligns with the provisions of the head lease.
Neglecting Landlord Consent
In most cases, landlords must give written consent before any sublease is valid. Businesses that skip this step risk entering into an unenforceable agreement. Even if the tenant is willing to sublet, the landlord’s approval is usually a legal requirement. Obtaining this consent not only legitimises the arrangement but also helps establish a transparent relationship with the landlord from the outset.
Poorly Drafted Agreements
Some businesses rely on informal agreements or generic templates when subleasing, which often fail to address key issues such as maintenance obligations, repair responsibilities, and exit strategies.
A vague or incomplete contract increases the likelihood of disputes between the tenant and subtenant. A properly drafted sublease agreement should clearly define responsibilities, protect the tenant from liability for the subtenant’s actions, and set out procedures for resolving disputes.

Misjudging Financial Risks
Subleasing can appear to provide an immediate financial relief, but overlooking hidden costs can be a serious mistake. Tenants remain liable to the landlord under the original lease, meaning they must cover rent and other obligations if the subtenant defaults. Businesses should carefully vet subtenants, assess their financial stability, and consider requiring guarantees or deposits to mitigate this risk.
Failing to Consider Fit-Out and Maintenance Obligations
Disputes frequently arise over who is responsible for alterations, repairs, or ongoing maintenance. If these responsibilities are not clearly defined, tenants may find themselves covering unexpected costs. The sublease should specify obligations for property upkeep, compliance with building regulations, and the reinstatement of the premises at the end of the term.
Ignoring Exit Strategies
Another common oversight is failing to plan for what happens at the end of the sublease. If the subtenant wishes to stay longer, or the tenant wants to reclaim the space, unclear terms can create conflict. Clear provisions for renewal, termination, and handover are vital to ensure a smooth exit and avoid legal disputes.
Protect Your Business with LegaFit Solicitors
The risks of subleasing office space mistakes are significant, but they can be avoided with careful planning and expert legal advice. At LegaFit Solicitors, we specialise in helping businesses draft and review sublease agreements that comply with head leases, protect financial interests, and minimise the risk of disputes.
Whether you are a tenant considering subleasing unused space or a business looking to occupy a sublet office, our team provides tailored guidance to ensure your arrangement is secure and beneficial.
Safeguard your business interests today—speak to our commercial sublease agreement lawyers for expert advice on subleasing office space.