What is total cost of ownership?
Everything it costs the owner to have and run an asset — direct and indirect costs and risk, totalled over the period and used to decide.
Total cost of ownership is everything it costs the owner to have and run an asset or system over the period it is owned. It starts with direct costs such as purchase, installation, energy, maintenance and spares, then adds indirect costs such as training, records, compliance effort and disruption.
The likely cost of failure is valued and added, the total is worked out over the period on the same basis for every option, and the result is used to choose and to set budgets. Poor ownership costing means hidden overheads, unpriced risk and bad choices.
- Boundary. Decide whose costs count, the study period and which assets are in scope.
- Direct. Add the costs that can be measured directly: buy, install and commission, energy, maintenance, spares and repairs, and eventual disposal.
- Indirect. Add training, tools, records, administration, compliance effort and disruption, with stated assumptions.
- Risk. Value the likely cost of failure from its likelihood, operational impact and safety exposure.
- Total. Sum over the period, per year and overall, on the same basis for each option, discounting future costs to present value where the organisation’s method requires.
- Decide. Choose the option or supplier, set the budget and monitor actual cost afterwards.
The owner’s whole cost: direct and indirect costs and risk over the period of ownership.
The cost that follows the asset itself from acquisition to disposal. The two overlap, and definitions vary by organisation.
Frequently Asked Questions
Q1What is total cost of ownership in airfield ground lighting?
Everything it costs the owner to acquire, run and keep an AGL asset or system over the period it is owned, including direct costs such as purchase, installation, energy, maintenance and spares, and indirect costs such as training, administration, disruption and compliance. It is used to make decisions on the full picture rather than the price.
Q2How is total cost of ownership different from lifecycle cost?
The two overlap and organisations define them differently. Lifecycle cost usually follows the asset itself from acquisition to disposal. Total cost of ownership takes the owner's view and brings in indirect and wider costs, such as training, support arrangements, operational disruption and compliance effort, as well.
Q3Which direct costs are included?
Purchase price, design and installation, commissioning, energy, routine maintenance, repairs, spares, warranty arrangements and eventual disposal. These come from contracts, work records and asset data, and are the part of the cost that is easiest to measure.
Q4Which indirect costs are often missed?
Training for technicians, tools and test equipment, record keeping and software, supplier management, compliance and audit effort, and the cost of outages or restrictions when equipment fails. They are harder to measure, so assumptions should be stated clearly so that they can be reviewed.
Q5How is risk reflected in total cost of ownership?
By estimating the likely cost of failures and their consequences, such as repair effort, operational impact and safety exposure, and adding it to the figure, often as a range rather than a single number. Evidence comes from failure history, condition data and manufacturer information.
Q6How is total cost of ownership used?
To compare suppliers and options on the same basis, to set and justify budgets, to decide between repair, refurbishment, upgrade and replacement, and to time renewals. Actual ownership costs are tracked afterwards and fed back so that the next estimate improves.
Q7Why does the study period and discounting matter when comparing options?
Options are only comparable over the same period and on the same basis. Costs that fall in different years are often discounted to present value, so an option with a higher purchase price but lower energy and maintenance cost, such as LED fittings against halogen, is judged on the whole period and not on the price. The period, discount rate and assumptions come from the aerodrome’s financial procedures and should be stated.
See It. Understand It. Then Learn How to Engineer It.
Recognising an AGL system visually is the first step. The next step is knowing how to design, install, test, commission and maintain them correctly.
Build Practical AGL Engineering Skills
Go deeper with structured training from Precision AGL Academy, covering:
Learn how each light, sign and circuit works as part of a complete airport lighting system, not just as an isolated diagram.