TCO — The Total Cost of Ownership of an Office Building: What It Is, How to Calculate It, and Why It Matters

When an office-building owner checks how much their property "costs," they almost always look at two numbers: the purchase price and the ongoing monthly maintenance cost. Both are correct — and both are misleading. The true cost of a building is measured across its entire life cycle, from the day you move in until you replace the last system in it. This is called total cost of ownership, or TCO. Whoever does not calculate it makes blind decisions — and usually costly ones.

What TCO Is, and Why It Is Not "How Much It Costs Per Month"

Total cost of ownership is the sum of all the expenses involved in holding an asset over the period of ownership. It includes the acquisition, the ongoing operation, preventive maintenance, repairs, end-of-life equipment replacements, the costs of regulatory compliance, and the indirect losses — space that is not leased because the elevator is down, or a tenant who leaves because the air-conditioning system collapses every summer.

This distinction is critical because most building owners in Israel manage the asset by monthly cash flow. As long as the ongoing account closes, it seems everything is fine. But a building is an asset that ages — and a system that did not receive preventive maintenance today will require an early, costly and unplanned replacement in five years. TCO is the tool that forces you to look at the entire life cycle at once, and not only at the month in front of your eyes.

From my field experience: a building may end up with a cumulative cost that is double, or even higher than double, its original purchase price after 30 years of operation and unplanned maintenance. This is not an exception — it is the common reality.

The Seven TCO Components of an Office Building

To calculate total cost of ownership you need to break the building down into cost components that you can track. These are the seven components that every building owner must know:

• Acquisition / capital cost: the purchase or construction price, transaction costs and the cost of the capital invested in the asset over time. This is the starting point — but usually no more than half of the TCO over decades.
• Operating costs: electricity, water, cleaning, security, gardening, insurance, municipal tax and management fees. This expense runs every month and accumulates to an enormous sum over the life cycle.
• Planned preventive maintenance (PPM): periodic service that extends the life of the systems — elevator service, cleaning of air-conditioning filters, electrical and suppression-system inspections. The expense that looks "optional" but pays for itself many times over.
• Breakdown maintenance and repairs: everything that breaks when you didn't expect it. The weaker the preventive maintenance, the more this item swells — usually at emergency prices.
• End-of-life capital replacements (capex / lifecycle replacement): a chiller, a generator, a roof, an elevator, a BMS — each of these has an expected service life, and at the end of it will require a full replacement. This is the component that is easiest to forget and most painful when it arrives.
• Compliance and regulatory costs: licensed-inspector elevator inspections, business-license renewal under the Business Licensing Law, 1968, accessibility adaptations under the Equal Rights for Persons with Disabilities Law and the accessibility regulations derived from it, fire licensing under the guidelines of the Fire and Rescue Authority, and electrical inspections under the requirements of the Electricity Authority. These are recurring expenses that fall due on a fixed schedule — and non-compliance with them costs far more than compliance.
• Indirect costs and opportunity loss: lost rent due to downtime, a decline in the asset's value, tenant departures, and reputational damage. The hardest to quantify, and sometimes the largest.

Note that only the first component is one-time. All the rest run over decades — which is why whoever looks only at the purchase price sees perhaps a third of the true picture.

The Tip-of-the-Iceberg Rule: Why the Purchase Is Usually the Small Part

For operational assets it is accepted to split the cost across the life cycle roughly as follows: the purchase price is the starting point, but the cumulative operating and maintenance expenses exceed it by a wide margin over the years of ownership. In an office building held for 30–40 years, the total operating and maintenance costs can amount to several times the original purchase price.

The practical meaning: every percent you save on the annual operating cost is worth far more than a percent you saved on the purchase price, because it repeats itself every year across the entire life cycle. And this is exactly where preventive maintenance comes in — it is the central tool that lets you lower this large, ongoing component.

We have expanded on the structure of the ongoing expense in the cost of property management in Israel 2026.

How Preventive Maintenance Lowers TCO — The Mechanism in Practice

The link between preventive maintenance and TCO is not intuitive, which is why many give it up first when tightening the budget. But the mechanism is simple: every system wears out at a rate that depends on the operating conditions and the quality of care. Preventive maintenance slows the wear, and in doing so extends the service life, defers the expensive capital replacement, and prevents cascading failures.

1. Extending Service Life — Deferring Capex

A chiller that gets cooling-tower cleaning, pressure checks and filter replacements on time will last many years longer than a neglected chiller. Every year you defer the replacement is a saving of the most expensive capital component. The same principle applies to a generator, an elevator and a roof. See the operational depth in air-conditioning maintenance in office buildings.

2. Preventing a Cascading Failure

A small fault that is not addressed becomes a large fault. From my field experience: a tiny leak in a pipe that looked "fine for now" turned within a single season into wall dampness, corrosion in the metal frame and structural damage that required an expensive repair and the evacuation of a tenant for two weeks. A loose contact in an electrical panel becomes a short circuit, a small fire and a shutdown of an entire floor. Preventive maintenance catches the failure at its cheap stage — and reduces the "breakdown maintenance" component, which is always more expensive because it arrives as an emergency.

3. Energy Efficiency

A maintained system consumes less. A clogged air-conditioning filter, a pump working at 110% load, uncalibrated lighting — all of these raise the electricity bill, which is one of the largest components of the operating cost. Preventive maintenance is also efficiency maintenance.

Whoever wants the practical translation into actions will find it in how to cut maintenance costs by 20%, and the annual schedule in the annual preventive maintenance checklist.

How to Calculate TCO in Practice — Eight Steps

You do not need expensive consulting software. A building owner can build a reasonable TCO model on their own, provided they are systematic:

• 1. Define the time horizon: choose the period you plan to hold the asset — 10, 20 or 30 years. TCO is always measured against a defined time horizon.
• 2. Map all the physical assets: create a full inventory of all the systems — elevators, chillers, generator, electrical panels, suppression system, water reservoirs, roof. Without an inventory there is no TCO.
• 3. Assign each asset an expected service life: based on manufacturer instructions, professional standards and field experience. This determines when a replacement event will fall.
• 4. Price the annual operation: electricity, water, cleaning, security, insurance, municipal tax — as an annual sum that rolls forward across the entire horizon.
• 5. Price the annual preventive maintenance: service contracts, periodic inspections, consumables.
• 6. Add a reserve for breakdown maintenance: a certain percentage of the value, which varies according to the age of the building and the quality of the preventive maintenance. An old building with weak PPM — the reserve is larger.
• 7. Schedule the capex events: place the major replacements on the timeline, and plan a sinking fund so they do not surprise you in terms of cash flow.
• 8. Add an estimate of indirect costs: a scenario of downtime, lost rent and a decline in value — even if only as a cautious and minimal estimate.

When you sum all these streams across the time horizon and divide by the number of years, you get the true average annual cost of ownership — a number entirely different from the monthly account you knew.

The Common Mistake: Cutting Maintenance to "Save"

This is the culture I fight against as a building manager. When the budget is tight, the first thing suggested for cutting is the preventive maintenance contract, because "nothing happens if we skip a quarterly service." But this is a classic accounting mistake: you save a small, certain sum today, and increase a large, probabilistic sum tomorrow. In TCO this is always a bad deal.

I have seen buildings that skipped roof maintenance for a few years and got a waterproofing and renewal bill that cost several times the total service that was saved — plus dampness damage to the floors below. I have seen air-conditioning systems that collapsed in the middle of summer because no one cleaned a cooling tower, and a two-day shutdown at the peak of the season cost the developer more than two years of preventive service. The imagined saving is a deferred expense — with interest.

The other side of the coin is proper vendor management. Preventive maintenance performed by an unprofessional or unsupervised vendor is a double waste. We have collected the pitfalls in vendor management mistakes.

Regulation as a TCO Component — Not "If" but "When"

Many building owners treat regulatory requirements as surprises. In practice they are entirely predictable expenses that should enter the TCO model in advance. A few examples from the Israeli field:

• Israeli Standard (SI) 1525 — defines a framework for documented preventive maintenance of buildings; complying with it also provides insurance protection.
• Fire licensing under the guidelines of the Fire and Rescue Authority — periodic inspections and approvals for fire-detection systems, sprinklers and suppression means.
• The Equal Rights for Persons with Disabilities Law and the accessibility regulations — require physical adaptations within defined transition periods; non-compliance exposes you to legal liability.
• Business-license renewal under the Business Licensing Law — a recurring process that requires meeting cross-regulatory requirements; proper management prevents delays and fine payments.
• Electrical inspections under the Electricity Authority standards — periodic and event-driven; documentation is mandatory.

Building according to Israeli Standard (SI) 5281 for green building, for instance, raises the construction cost but lowers the operating cost over the years — and this is exactly the case where looking at the purchase price alone leads to the opposite of the right decision. Whoever places the regulatory requirements into the TCO in advance is never surprised. We have expanded on the framework in the SI 1525 building maintenance guide.

The Building's Age Point — Where You Are in the Life Cycle Changes Everything

TCO does not look the same in a 5-year-old building and in a 25-year-old building. The difference is critical for planning:

• A new building (0–10 years): operating costs dominate; capex events barely exist; preventive maintenance is a cheap investment that lays the foundations for the rest of the life cycle. This is the time to build an inventory, schedules and documentation habits.
• A mid-age building (10–20 years): the first capex events arrive — an elevator that needs an upgrade, electrical panels that are aging, a roof that starts to worry. A planned renewal fund is the difference between managed cash flow and an emergency loan.
• An older building (20+ years): all the systems approach replacement age simultaneously. Without consistent preventive maintenance in the past years, TCO at this stage soars dramatically — and whoever did not prepare a renewal fund will find themselves in a critical cash-flow situation.

One of the most common mistakes I see: owners who buy a 15–18-year-old asset without performing a TCO check for a 10–15-year horizon ahead — and discover in the fourth year after the purchase that they must simultaneously replace a chiller, a generator and water reservoirs.

Why You Need a System and Not an Excel Sheet

A serious TCO calculation requires data — and data accumulates only if you document systematically. You need to know when each system was installed, when it received service, which faults it had, and how much each event cost. Without this history, the expected service life is a guess, and the breakdown reserve is a gamble.

This is where a building management system that documents every inspection, every fault and every replacement comes in — accumulating exactly the database on which the TCO model feeds. When the inventory, the maintenance log and the financial history sit in one place, TCO stops being a theoretical estimate and becomes a real number that updates itself. This is how we work at building management with Domera, and it is also the logic behind building management systems (BMS) that supply the consumption and failure data in real time.

The bottom line: total cost of ownership is not an academic exercise. It is the tool that shows, in black and white, that every unit invested in documented preventive maintenance comes back multiplied — in deferring capital expenses, in preventing failures and in preserving the asset's value. Whoever manages a building by the monthly account alone pays the TCO in any case, just without planning it — and therefore at a high price.