Underlease vs Sublease: Commercial Leasing in New Zealand

If your business is growing, pivoting, or simply trying to keep overheads under control, your premises can quickly become a big part of the puzzle.

Maybe you’ve found a great space but don’t want to commit to a full commercial lease. Or you’ve already signed a lease, but now you don’t need all the area (or you’re relocating) and you’re wondering whether you can sublet it to someone else.

This is where people start comparing an underlease vs sublease. The terms are sometimes used loosely, but the legal arrangement behind them matters - because it affects who owes what, who has rights against whom, and what your landlord can (and can’t) require.

Below, we’ll break down the key differences, what to check in your lease, and the practical steps NZ businesses should take to protect themselves from day one.

What Does “Underlease vs Sublease” Mean In NZ Commercial Leasing?

In everyday conversation, business owners often say “sublease” to mean “I’m renting out the space I’m leasing to someone else.” In New Zealand, you’ll also hear the term “underlease” used - sometimes for the same idea, but not always in exactly the same way.

At a high level:

• Sublease: you are the tenant under a head lease, and you grant a new lease to another party (the subtenant) for some or all of the premises.
• Underlease: in NZ commercial practice, this is commonly used to describe a type of sublease that is carved out of the head lease (often with more formal drafting conventions around term and structure).
• Head lease: the main lease between the landlord and the original tenant (often called the head tenant).

So why do people ask “underlease vs sublease” if they sound so similar?

Because in commercial leasing, small differences in structure (and wording in the documents) can change:

• who is responsible for rent and outgoings
• who the landlord can pursue if something goes wrong
• what happens at the end of the lease term
• how much control you keep over the premises

In practice, “sublease” is often used as an umbrella term. “Underlease” is often used in more formal documentation and can carry technical implications (for example, around the term ending before the head lease and how the interest is granted). Rather than relying on labels, you want to focus on the legal effect of the arrangement you’re signing.

Sublease/Underlease vs Assignment: Don’t Mix These Up

When you’re working out the underlease vs sublease question, it’s also important not to confuse either with an assignment.

• Sublease/underlease: you remain the tenant to the landlord, and you become the landlord to the subtenant.
• Assignment: you transfer your lease interest to someone else, so they step into your shoes as tenant (usually with landlord consent).

If you’re assigning a lease, you may need a formal Deed of Assignment of Lease to properly document the transfer.

If you’re not sure which option you’re dealing with, it’s worth slowing down and getting advice early - because the wrong document can leave you “on the hook” for a site you thought you’d moved on from.

How Does A Sublease (Or Underlease) Actually Work?

In most sublease/underlease arrangements, there are three parties involved:

• Landlord (owner of the premises)
• Head tenant (you, if you’re subleasing out)
• Subtenant (the business renting from you)

The key concept is this: the head lease stays in place.

That means:

• You still owe the landlord the obligations in your lease (rent, outgoings, repairs, make-good, insurance obligations, and so on).
• The subtenant owes you the obligations in the sublease/underlease (rent to you, compliance with use rules, keeping the space in good condition, etc.).
• Unless the landlord has a direct agreement with the subtenant (for example, through a consent deed or other document), the landlord typically enforces the head lease against you, not the subtenant.

This is why the underlease vs sublease distinction isn’t just a terminology question - it’s about understanding risk allocation. If the subtenant stops paying, the landlord generally still expects you to pay the rent on time under the head lease.

Do You Need Landlord Consent To Sublease?

Often, yes - but it depends on the terms of your head lease and (in some situations) the legal framework that applies to your lease.

Many commercial leases include an “assignment and subletting/underletting” clause that either:

• prohibits subleasing/underleasing entirely, or
• allows it only with the landlord’s prior written consent (sometimes subject to conditions).

This is one of those areas where “we’ve agreed it verbally” isn’t enough. You’ll usually want landlord consent documented properly, and you’ll want the sublease to align with the head lease obligations - so you don’t accidentally breach your own lease by the way you’ve set up the arrangement.

If you’re negotiating terms with the landlord first, you might start with a non-binding deal outline, but you should be careful about when documents become binding and what conditions apply. In leasing and property deals, the concept of an unconditional contract can be especially important if you need finance, approvals, or landlord consent.

Key Differences That Matter In An Underlease vs Sublease Scenario

Although “underlease” and “sublease” are sometimes used to describe similar arrangements, the drafting and structure can differ - and those differences can matter in practice.

1) Term: Does It End Before The Head Lease?

A common rule in practice is that the sublease/underlease term must not exceed the head lease term, and it’s often structured to end slightly before the head lease ends.

If your head lease ends (or is terminated), your sublease can be affected too. That’s a big deal if your subtenant has invested in fitout, signage, stock, or a local customer base.

From a head tenant perspective, you also want the sublease to end in time for you to comply with end-of-lease obligations (like make-good) under your head lease.

2) Rent And Outgoings: Who Pays What?

Commercial rent isn’t always just “weekly rent”. Depending on the lease, you might have:

• operating expenses/outgoings
• insurance contributions
• utilities
• maintenance contributions
• rates (depending on the arrangement)

When you sublease, you need to decide whether the subtenant:

• pays a “gross” rent (one amount that includes outgoings), or
• pays base rent plus a share of outgoings, or
• pays rent and reimburses you for outgoings as charged by the landlord.

It’s also worth thinking about what happens if the landlord increases outgoings or changes the way they’re calculated. If your sublease doesn’t allow you to recover those costs, you can end up wearing them yourself.

3) Repairs, Maintenance, And Fitout: Who Is Responsible?

One common commercial leasing headache is the mismatch between:

• what the head lease requires you to do; and
• what the sublease requires the subtenant to do.

If your lease makes you responsible for certain repairs, you’ll want to make sure your sublease either:

• requires the subtenant to carry out those responsibilities (where appropriate), or
• allows you to enforce compliance and recover costs.

Fitout is another big one. Your subtenant might want to install signage, partitions, plumbing, or specialised equipment. Your head lease may restrict alterations without consent - so your sublease should line up with those rules to avoid putting you in breach.

4) Control And Risk: Who Takes The Hit If Something Goes Wrong?

This is where comparing an underlease vs sublease becomes a real-world issue: the structure determines who has the legal relationship with the landlord.

In most sublease situations, the landlord’s primary leverage is against the head tenant. That means you want strong protections in the sublease to manage risks like:

• non-payment of rent
• damage to the premises
• illegal or non-compliant use
• nuisance complaints
• health and safety issues on site

If you’re bringing contractors on site for fitout or ongoing services, it can also be important to document responsibilities clearly.

What Should You Check Before You Agree To Sublease Or Underlease?

Whether you’re the head tenant looking to sublease, or the incoming subtenant taking a space, there are a few key checks that can save you a lot of stress later.

Check 1: Does Your Head Lease Allow Subleasing (And On What Conditions)?

Start with the head lease. Look for clauses about:

• assignment and subletting/underletting
• landlord consent requirements
• conditions the landlord can impose (for example, financial checks, deed requirements, or guarantees)
• permitted use (what the premises can be used for)
• alterations and signage rules

If your lease is unclear, getting a proper Commercial Lease Review can help you understand what you can do without accidentally breaching the lease.

Check 2: Are You Actually Subleasing Or Are You Licensing Space?

Sometimes, what looks like a sublease is actually a licence arrangement (for example, sharing space, hot-desking, short-term pop-ups, or “renting a room” style arrangements).

A licence can be more flexible, but it’s not the same as a lease, and the rights are different. If you’re granting someone permission to occupy without granting exclusive possession, you may be looking at a Property Licence Agreement rather than a sublease.

This is worth getting right because the wrong structure can create disputes about whether someone is a tenant (with stronger rights) or a licensee (with more limited rights).

Check 3: Does The Premises Use Match The Subtenant’s Business?

“Permitted use” clauses can be strict in commercial leases, especially in retail, hospitality, and mixed-use buildings.

Even if you’re happy for the subtenant to run a particular business, your landlord may not be - or the building rules may restrict it. If the subtenant operates outside the permitted use, you (as head tenant) could be in breach.

Check 4: Are There Compliance Issues You Need To Think About?

Leasing isn’t only about paying rent. Depending on the premises and business type, you may need to think about:

• health and safety obligations under the Health and Safety at Work Act 2015 (especially where multiple businesses operate in the same space)
• building compliance and accessibility requirements
• fire safety rules

What Legal Documents Do You Typically Need For A Sublease Or Underlease?

The exact documents you need will depend on your head lease, the landlord’s requirements, and whether you’re subleasing all or part of the premises. But for most NZ businesses, these are the key documents to think about.

1) The Sublease/Underlease Document Itself

This is the contract between the head tenant and the subtenant. It should clearly set out:

• the premises (and a plan, if needed)
• the term (including renewal rights, if any)
• rent, outgoings, bond, and how/when payments are made
• use of premises and restrictions
• repair/maintenance obligations
• insurance requirements
• who is responsible for compliance matters (including any building rules)
• termination rights and default processes

2) Landlord Consent (Usually In Writing If Required Under The Head Lease)

Where the head lease requires consent, you’ll generally need the landlord’s written consent before any sublease is valid. This may be:

• a simple consent letter, or
• a formal deed or consent document with extra conditions.

Landlords sometimes require you to provide details of the subtenant and the sublease terms. They may also require the subtenant to sign additional documents (for example, acknowledging key lease terms).

3) A Deed Of Assignment (If You’re Not Subleasing)

It’s not uncommon for business owners to say “I’m subleasing” when they actually mean “I’m exiting the lease and transferring it to someone else.” If you’re transferring your lease to a new tenant, it’s usually an assignment, documented via a Deed of Assignment of Lease.

This can have very different risk implications than subleasing, so it’s worth confirming which structure you’re using before you negotiate commercial terms.

4) A Commercial Sublease Agreement (If You Want Something Purpose-Built)

Because the risk profile of underleasing/subleasing is unique (you’re balancing obligations to the landlord and the subtenant), many businesses prefer a purpose-built agreement rather than a generic template. A tailored Commercial Sublease Agreement can help ensure your sublease properly mirrors and supports your head lease obligations.

This is especially important if:

• you’re subleasing only part of the space
• there are shared areas or shared services
• your business will still operate on site
• the landlord has strict fitout, signage, or use restrictions

Key Takeaways

• The underlease vs sublease question is partly about terminology, but the bigger issue is the legal structure and what obligations flow between landlord, head tenant, and subtenant.
• In a typical sublease/underlease, you stay responsible to your landlord under the head lease, even if your subtenant fails to pay rent or damages the premises.
• Before you sublease, check your head lease for any consent requirements, permitted use rules, and restrictions on alterations, signage, and dealing with the premises.
• Don’t confuse a sublease with an assignment - an assignment transfers your lease to a new tenant and usually requires a formal Deed of Assignment.
• Make sure the sublease/underlease term, rent structure, outgoings, and repair obligations align with the head lease so you don’t end up out-of-pocket or in breach.
• If the arrangement is more like sharing space without exclusive possession, a licence (rather than a sublease) might be a better fit - but the document needs to match the reality.
• Because subleasing can create layered legal risk, it’s usually worth getting the documents reviewed or drafted properly instead of relying on a one-size-fits-all template.

If you’d like help working out whether you need an underlease, sublease, licence, or assignment - or you want your documents reviewed before you sign - you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.