Subletting in the hybrid era: What tenants and landlords need to know 

The post-pandemic shift towards hybrid working has reshaped the commercial office landscape in recent years. For tenants, the result has often been surplus space – desks that sit empty most days, unused meeting rooms, and entire wings of an office that feel more like a relic of 2019 than a necessity in 2025. In this context, subletting part of an office may seem like a practical solution. It’s a way to cut costs, make better use of space, or offer flexible arrangements to other businesses.

For landlords subletting can raise major concerns about who is occupying the space, how that affects the building’s value, and what might go wrong down the line. At the centre of the issue is the lease, and what it allows.

Understanding the landlord’s concerns

From a landlord’s point of view, renting out commercial space is about more than collecting rent. The type of tenant, the way the space is used, the rent level, and how long the tenant stays all contribute to the value of the building. Allowing a third party to move in, even indirectly, changes that dynamic.

Landlords worry that a subtenant may not be a good fit for the building. They may pay lower rent, which could drag down the building’s rental value. While the original tenant remains legally responsible, it’s harder for landlords to manage issues when someone else is in occupation.

There’s also the issue of flexibility. If space is split up and sublet to different occupiers, it becomes harder for the landlord to re-let the space in future or to adapt the building for other uses. These are some of the reasons why leases tend to include tight restrictions on subletting.

What the lease allows (and what it doesn’t)

The starting point is always the lease. It sets out whether the tenant is allowed to sublet, and if so, on what terms. In some cases, subletting is banned altogether. More often, however, it is allowed, but only with the landlord’s written consent and hopefully that consent cannot be unreasonable withheld or delayed.

Even when subletting is permitted, there will usually be strict conditions attached. The lease might say that the rent under the sublease cannot be lower than the current rent. It might require the subtenant to take on the same responsibilities as the main tenant, such as keeping the space in good repair, or only using it for certain purposes. Some leases insist that subtenants must be financially sound or that the sublease must include rent reviews.

Unfortunately, some clauses are easy to overlook but could have big consequences. For example, if the lease says the tenant must stay in “actual occupation,” that could rule out subletting altogether. Similarly, informal deals, like sharing desks or letting someone use part of the office, can breach the lease if they amount to giving up control of the space.

Subletting vs. Transferring the lease

It’s helpful to understand the difference between subletting and assigning a lease. Assignment means transferring the whole lease to someone else, ending the tenant’s involvement. Subletting means the tenant stays responsible but lets someone else use the space – essentially becoming their landlord.

Sometimes tenants try to avoid lease restrictions by calling the arrangement something else, like a licence or a desk-share. But the courts will look at what the arrangement actually is, not what it’s called. If the other party has a clear right to occupy part of the premises on their own, for a set period, it will probably be treated as a sublease. And that means the tenant needs to follow the same rules, starting with landlord consent.

What happens if you get it wrong?

Subletting without consent (when it’s required) is a breach of the lease. In serious cases, the landlord could take steps to end the lease altogether. Even if they don’t, the tenant might have to pay compensation or undo the arrangement at their own expense.

These kinds of breaches can also cause problems later. If the tenant wants to sell their lease, refinance, or renew it, an unauthorised subletting could block that happening.

Informal arrangements can also be caught. If a business friend is using some of the space and paying towards the bills, that might still count as subletting and may still need landlord approval.

Getting consent

If you’re thinking about subletting, the first step is to check your lease and take advice. If landlord consent is needed, prepare a clear application with details about who the subtenant is, and all the main terms agreed for the subletting.

Landlords must not be unreasonable in refusing consent, if the lease says they must act fairly. Landlords are entitled to consider things like the subtenant’s reputation, finances, or how the deal affects the building, and then give their decision on the application within a reasonable time frame. The form of sublease will usually form part of the application for landlord’s consent so get a good application prepared. This is something we at Newmanor Law would put together for you in conjunction with information obtained on the subtenant by you or your agent.

Practical considerations

Legal points aside, tenants need to think about the practicalities. Will the subtenant be using shared spaces like kitchens or meeting rooms? How will utilities and maintenance bills be divided? Could there be tension between businesses sharing the space?

Most importantly, tenants need to remember they still have primary responsibility for the premises. If the subtenant doesn’t pay or causes problems, the landlord will expect the tenant to sort it out. That’s why it’s important to check references, document the deal properly, and keep open lines of communication.

The rules apply

With so many businesses adjusting to hybrid working, subletting has become a common way to adapt. But it’s not risk-free. Lease terms can be complex, and stepping outside them, however innocently, can lead to costly mistakes.

Handled carefully, though, subletting can benefit both tenants and landlords. It can help tenants manage costs and space, while keeping the building in active, professional use. The key is to go in with eyes open, understand the lease, and get the paperwork right from the start.

In the modern workplace, flexibility may be essential – but clarity and compliance still matter just as much.