A triple net lease, written NNN, is a commercial lease in which the tenant pays base rent and also carries the building's three main running costs: property taxes, insurance and maintenance. The landlord "nets" those costs out of the rent. According to Cornell's Legal Information Institute, the tenant pays rent, property taxes, insurance and common area maintenance (CAM) charges, and sometimes utilities or repairs as well. The term comes from the US. Slovenia has no regulated NNN category, so the label means only what your contract says it means.
This guide explains what NNN stands for, what a tenant really pays, how it compares with a gross lease, and what to check if you sign a lease for an office, shop, warehouse or restaurant in Slovenia.
TL;DR
- NNN means "net, net, net": the tenant pays base rent plus property taxes, insurance and operating or maintenance costs.
- A gross lease is the opposite: one all-inclusive rent, with the landlord covering operating expenses.
- Slovenia does not treat NNN as a legal category. Costs are set by the parties' contract under the general rules of the Code of Obligations.
- The real risk is in the definitions: what counts as a common-area cost, what is excluded, and whether controllable costs are capped.
- Compare offers by total occupancy cost per square meter, not by the headline rent alone.
Table of Contents
- What does NNN stand for?
- How a triple net lease works
- A worked example
- Triple net vs. gross lease
- Is NNN used in Slovenia?
- VAT on NNN charges
- What to check in an NNN-style contract
- Who benefits from a triple net structure
- How to compare offers
- Work with HOOF on your next commercial lease
- FAQ
- Sources
What does NNN stand for?
NNN is shorthand for "net, net, net". Each "net" stands for one category of landlord expense that moves to the tenant. Holland & Knight describes the three categories as operating expenses, taxes and insurance.
The name has a history. A single net lease passes on one cost, typically property tax. A double net lease passes on two, usually tax and insurance. Triple net passes on all three. In practice these labels are loose, and different markets and brokers use them differently. That is why you should never rely on the label alone. Two leases that both say "triple net" can allocate costs quite differently.
How a triple net lease works
Under an NNN lease the tenant pays a base rent and then the expenses of running the property. Investopedia sums up the structure: almost all responsibilities sit with the tenant, who pays rent, property taxes, building insurance and maintenance or repair costs.
The tenant's monthly payment therefore has two layers:
- Base rent. The fixed amount for the right to use the premises.
- Additional charges. The tenant's share of taxes, insurance and operating costs, billed on top of rent. These usually vary from year to year.
For a multi-tenant building, the share is normally proportional. If you lease 400 m² in a building of 4,000 m², your share is 10% of the shared costs. In a single-tenant building, the tenant may carry the whole cost, including roof and structure in some contracts.
The three cost groups
Property taxes. In the classic US model the tenant reimburses the landlord for property tax. In Slovenia the equivalent is the set of public charges tied to the property, such as the building land use compensation. Your contract should say who bears it and how it is invoiced.
Insurance. Building insurance, and often liability cover for common areas. The tenant pays a share of the premium. Note that in Slovenian practice, the landlord typically arranges insurance for the premises while the tenant bears the associated cost, which fits the NNN logic: the landlord buys the policy, the tenant reimburses.
Operating and maintenance costs. Cleaning of common areas, lifts, heating and cooling of shared spaces, security, landscaping, repairs and building management fees. This is the category where disputes happen most, because it is the broadest.
A worked example
Imagine a 300 m² office in a building of 3,000 m². The numbers below are invented to show the mechanics, not market data.
| Item | Monthly figure | Who pays under NNN |
|---|---|---|
| Base rent | 12 € per m² = 3.600 € | Tenant |
| Share of building insurance | 0,30 € per m² = 90 € | Tenant |
| Share of public property charges | 0,40 € per m² = 120 € | Tenant |
| Share of operating costs | 2,50 € per m² = 750 € | Tenant |
| Total before VAT | 4.560 € |
Under a gross lease for the same space, the landlord would quote one rent that already folds in the last three rows, and would carry any increase in them during the term. With NNN, the base rent looks lower but the tenant carries the variation. If insurance premiums or heating costs rise, the tenant's invoice rises. If the building becomes more efficient, it falls.
Triple net vs. gross lease
The cleanest way to understand NNN is to put it beside its opposite. Under a gross lease the landlord pays operating expenses and the tenant pays one all-inclusive rent. Many leases sit between the two. A modified gross lease, for example, fixes some costs in the rent and passes on others.
| Criterion | Triple net (NNN) | Gross lease |
|---|---|---|
| Headline rent | Lower base rent | Higher, all-inclusive rent |
| Taxes, insurance, upkeep | Paid by tenant on top | Paid by landlord from the rent |
| Cost predictability for tenant | Lower, costs vary | Higher, one figure |
| Cost transparency | High, itemized costs | Low, costs are hidden in rent |
| Landlord's risk of cost increases | Low | Higher |
| Typical fit | Single-tenant buildings, long leases, investors | Offices in multi-tenant buildings, shorter leases |
Neither is better in the abstract. A tenant with a stable budget who values predictability may prefer gross. A tenant who wants control over costs, or is leasing a whole building and will manage it anyway, may prefer net. A landlord who wants stable income without operating risk often prefers net.
Is NNN used in Slovenia?
Not as a named legal type. Slovenian commercial leases are contracts between the parties, and Slovenian law gives them broad freedom to decide how taxes, maintenance and insurance costs are shared. So a Slovenian lease can be economically "triple net" without ever using the term, and a lease that uses the term can still leave some costs with the landlord.
What you will see in Slovenian practice is a split between a fixed and a variable part. A sample commercial lease published by a public institution in 2025 defines rent as a fixed payment for the premises plus a variable payment for the tenant's proportionate share of operating costs, insurance and related public charges. That is the same architecture as NNN, written in local terms: najemnina, obratovalni stroški, zavarovanje and nadomestilo za uporabo stavbnega zemljišča.
When you read a Slovenian offer, look for these phrases and ask what sits behind each:
- Najemnina (rent) and whether it is fixed or indexed.
- Obratovalni stroški (operating costs) and what is listed in them.
- Stroški upravljanja (management costs) and who the manager is.
- Zavarovanje (insurance) and who holds the policy.
- Javne dajatve (public charges) and who pays them.
VAT on NNN charges
Additional charges are not VAT-free by default. Commercial leases in Slovenia are generally VAT exempt unless the parties opt to charge VAT, which requires both sides to be VAT registered. In practice, most landlords and tenants choose the 22% rate. The same source notes that the VAT treatment of service and utility charges depends on whether they are billed separately or included in the rent.
That matters for NNN. If you pay operating costs as a separate line, the VAT treatment of that line should be spelled out. For a VAT-registered business tenant the VAT is usually recoverable, but confirm that with your accountant. We cover the details in our guide to VAT on commercial leases in Slovenia.
What to check in an NNN-style contract
The label matters less than the clauses. Holland & Knight advises checking the definition of common-area costs, the exclusions, and any cap on controllable operating expenses. In a Slovenian setting, translate that into a short checklist.
1. The definition of operating costs
Is there a closed list or an open phrase such as "all costs related to the building"? An open phrase can sweep in costs you never expected. Ask for an annex that lists each cost item.
2. Exclusions
A fair lease excludes costs that belong to the owner: financing, the landlord's own management overhead beyond an agreed fee, and capital repairs to structure or roof, unless clearly agreed otherwise. Write down what the landlord keeps.
3. Caps and increases
Controllable costs, such as cleaning, security and management fees, can be capped at a percentage of increase per year. Costs the landlord cannot control, such as public charges or insurance premiums, are normally passed through at actual cost.
4. Advance payments and reconciliation
Most tenants pay monthly advances and receive an annual statement. Agree on a deadline for that statement, your right to see supporting invoices, and how overpayments are returned.
5. Allocation key
Share by floor area, by usage or by number of units? In a mixed building with retail on the ground floor and offices above, the key can change your bill a lot.
6. Repairs and condition at handover
Who fixes the heating system if it fails in year three? NNN pushes maintenance toward the tenant, so document the condition of the premises at handover. If the landlord is to contribute to your fit-out, see how a tenant improvement allowance works in Slovenia.
7. Security and exit
Long NNN leases often come with a deposit or a bank guarantee, and the tenant's exit rights decide how risky the commitment is. Read the options in our guides to lease termination and the break clause.
Who benefits from a triple net structure
Landlords and investors. Income is more stable, because cost swings pass to the tenant, and management is lighter. This is why NNN is popular in investment deals with single tenants on long leases. The quality of the tenant matters most, since the income depends on that tenant's ability to pay.
Tenants. A lower base rent, full visibility of costs and often more control over how the space is maintained. The price is exposure to cost increases and responsibility for work a gross lease would leave with the landlord.
Owners who prefer a hands-off model. A professional manager can handle cost allocation, invoicing and reconciliation on the owner's behalf. See what that involves in our overview of commercial property management in Slovenia.
How to compare offers
The simplest method is to convert every offer into a total occupancy cost per m² per month, then compare.
- Ask for each landlord's estimate of additional costs per m², with last year's actual figures.
- Add base rent and additional costs, then add VAT if applicable.
- Add your own one-off costs: fit-out, deposit financing, and any guarantee fee.
- Compare over the full term, including indexation of rent.
A rent of 10 € per m² on a net basis and 13 € per m² on a gross basis can end up being the same money. Only the itemized comparison shows it. Before you sign, agree the main points in writing in a letter of intent, and use our lease negotiation guide to decide which clauses to push on.
Our perspective
In our experience of the Slovenian market, the word "net" is an invitation to read more closely, not a standard. Because Slovenian law leaves cost allocation to the contract, every lease is its own small system, and the people who do well are those who read the cost schedule before they discuss the rent.
We approach this from both sides of the table. When we represent a landlord, we aim to build a cost schedule that is clear enough that a tenant's advisor has little to argue about, because disputes over service charges damage long relationships. When we represent a tenant, we aim to turn a headline rent into a full occupancy cost and to negotiate the definitions, caps and reconciliation rights that protect the budget.
We are a boutique agency, so the same people who analyze the market also take part in the negotiation and stay with the client through the transaction. For owners, that means a lease designed with its management in mind. For tenants, it means a lease you can budget for.
Maruša
Work with HOOF on your next commercial lease
Whether you are a landlord who wants a clear cost structure or a company looking for premises, we support the process from market analysis to signature. Our services include landlord representation and leasing of commercial space, tenant representation, valuation and ongoing property management.
If you are searching for premises, browse commercial spaces for rent in Slovenia, or look at our retail space listings. To discuss a lease, a cost schedule or an investment, contact us through hoof.si.
FAQ
What is an NNN lease in simple terms?
It is a commercial lease where the tenant pays base rent and also pays the building's property taxes, insurance and maintenance costs. The landlord receives rent "net" of those expenses. The exact list of costs is always defined in the contract.
Is a triple net lease good for tenants?
It can be, if the base rent is clearly lower than a comparable gross rent and the cost schedule is itemized and capped where possible. It suits tenants who want transparency and control. It is less comfortable for tenants who need one fixed monthly figure, and for them a gross or modified gross lease may fit better.
Does Slovenia have triple net leases?
Slovenia does not regulate NNN as a category, but the parties may allocate taxes, maintenance and insurance by contract. Many leases already split a fixed rent from a variable share of operating costs, insurance and public charges. That is economically similar to NNN even if the term is not used.
What is the difference between triple net and gross?
In a triple net lease the tenant pays rent plus taxes, insurance and operating costs separately. In a gross lease the landlord pays the operating expenses and the tenant pays one all-inclusive rent, as Cornell's Legal Information Institute explains. Modified gross leases fall in between.
Is VAT charged on triple net costs in Slovenia?
Leases are generally VAT exempt unless both parties are VAT registered and opt to charge it, and in practice most choose the 22% rate. Whether separately billed service and utility charges carry VAT depends on how they are invoiced, so confirm the treatment with your accountant before signing.
Sources
- net lease, Wex, Legal Information Institute (Cornell Law School)
- Who Pays for What? Understanding Key Differences in Triple Net Leases, Holland & Knight
- Triple Net Lease (NNN): A Guide to Investing in NNN, Investopedia
- Real Estate Laws and Regulations Report 2026 Slovenia, ICLG
- Overview of retail lease agreements in Slovenia, CMS
- Sample commercial lease agreement, ZZZS (2025)
