01
Maintenance capex
Replacements, overhauls and end-of-life renewals that keep existing capacity available. Largely non-discretionary, and usually the largest single block of the budget in asset-heavy industries.
Capex fundamentals
Capex, explained: what capital expenditure really means in practice
Overview
Everyone in an industrial business uses the word capex. Far fewer agree on where it starts, who owns it and what happens after the money is approved.
- Topic
- Capex fundamentals
- Written by
- Weissr Capex Experts
- Published
- 10 September 2026
- Reading time
- 7 min read
The short answer
What is capex?
Capex, short for capital expenditure, is money an organisation spends to acquire, build, upgrade or extend the life of a long-term asset, such as a plant, machine, building or major system. Because the asset delivers value over several years, the cost is capitalised on the balance sheet and depreciated over its useful life rather than expensed at once.
In an industrial group, capex is also the mechanism by which strategy becomes physical. The factories you can operate in five years, the products you can make and the emissions you produce are all consequences of capital decisions taken now. That is why capital allocation is treated as an executive responsibility rather than a budgeting exercise.
Categories
Four kinds of capex,competing for one envelope.
Treating all capital requests as one undifferentiated queue is the most common prioritisation error. These four categories follow different rules and should be reserved in a deliberate order.
02
Compliance capex
Investments required by safety, environmental or regulatory obligations. Companies still need to decide when to invest, what the work should cost and how to sequence it across sites.
03
Growth capex
Added capacity, new lines, debottlenecking and market expansion. Decisions depend heavily on return calculations, demand assumptions and sensitivity analysis.
04
Strategic capex
Investments that change the shape of the business: new technology, decarbonisation, footprint restructuring. Long payback, high uncertainty, and rarely comparable on NPV alone.
Capex vs opex
Where capex ends and opex begins
The test is whether the spend creates or extends an asset with a useful life beyond the current period. If it does, it is capitalised. If it simply keeps operations running, it is operating expenditure and hits profit immediately.
Consistent treatment matters most in boundary cases. Major overhauls, software implementations, spare-parts strategies and turnaround work all sit close to the line. A written capitalisation policy plus a monetary threshold keeps classification comparable across sites. That consistency is necessary for reliable portfolio reporting. We cover the split in detail in Capex vs Opex.
How it works
How capex moves through an organisation
Capital does not arrive as a single decision. It passes through a sequence of them, each owned by a different part of the business:
- Strategy sets the direction and the size of the envelope over a multi-year horizon, against the asset base and its replacement profile.
- Planning turns candidates into a ranked plan, scoring requests from every site on consistent criteria rather than submission order.
- Budgeting funds the plan with allocation pools, timing, contingency and authority limits.
- Approval authorises individual requests through the delegation-of-authority matrix, with an auditable record of each decision.
- Execution delivers against the baseline, with live cost, commitment and forecast-at-completion tracking.
- Review closes the loop, comparing outcome with case so the next round of estimating is better.
Each step is straightforward on its own. Problems arise when organisations run the steps in different tools and lose context between them. See the capex process for what that costs.
Glossary
The capex vocabulary, briefly
- Capital expenditure (capex)
- Spend that creates or extends a long-term asset, capitalised and depreciated.
- Operating expenditure (opex)
- Spend consumed in the current period and expensed immediately.
- Capital budget
- The approved funding envelope for capital investment in a period.
- Investment case
- The document justifying a specific investment: cost, benefit, alternatives, risk.
- Delegation of authority
- The matrix defining who may approve what, by value, type and risk.
- Forecast at completion
- The current best estimate of total cost when the investment is finished.
- Post-investment review
- Comparison of delivered cost and realised benefit against the approved case.
Weissr
How Weissr fits
Weissr is a capex platform for industrial groups. It connects the capital lifecycle in one system: Capex Strategy for long-term direction and the asset base, Capital Budgeting for the envelope, and Capex Management for approvals, execution and close-out, while reporting and dashboards keeping the portfolio position current.
It governs capital decisions rather than replacing your ERP fixed asset register or accounting system; approved capital, commitments and posted actuals stay reconciled between them.
If the question behind your capex is which investments deserve funding at all, see strategic capital allocation, or how Weissr is used by CFOs and finance leaders and FP&A and capital planning teams.
Key takeaways
- Capex is spend that creates or extends a long-term asset; it is capitalised and depreciated over the asset's useful life.
- Four categories compete for one envelope: maintenance, compliance, growth and strategic capex.
- Maintenance and compliance capex are largely non-discretionary and should be reserved before discretionary competition.
- Capex moves through six steps: strategy, planning, budgeting, approval, execution and post-investment review.
- A written capitalisation policy keeps the capex/opex boundary consistent across sites and makes portfolio reporting reliable.
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Keep reading
All Capex Blog posts
Capex maturity
How Mature Is Your Capex Process? Find Out in 3 Minutes
Signs your Capex process has not kept pace with the business, and a three-minute assessment to see where you stand.
4 min read
Buyer's guide
Best capital planning software: a buyer's guide for finance leaders
How to tell capex, capital planning and project software apart, and ten criteria to check before you compare vendors.
13 min read
CEO perspective
Capital Allocation is Your Strategy
Why the companies that outperform on capex will not be those that invest most, but those that allocate best and reallocate fastest.
9 min read
CEO perspective
The Tail Wags the Dog: Your Capex Process Is Quietly Writing Your Strategy
Every approved project can have a positive NPV while the portfolio still takes the company somewhere leadership never chose.
8 min read
Capex fundamentals
Capex vs Opex: the line that decides who gets to say yes
Capital expenditure and operating expenditure explained in plain language, with examples, a comparison table and the practical effect on financial governance.
8 min read
Capex process
Inside the capex process: six decisions between a strategy and a built asset
How strategy, planning, budgeting, approval, execution and review connect, and why weak handovers undermine capital decisions.
9 min read
Capex governance
Why capex approvals take months and what actually shortens them
A practical look at the capex approval process, where delays arise and how each stage should work.
9 min read
Capex forecasting
Why capex forecasts are inaccurate, and why the miss goes unmeasured
Why replacing each quarterly forecast makes accuracy difficult to measure, and what companies lose when the history disappears.
8 min read
Our story
The Weissr story: from capex advisory work to a Capex Platform
Where Weissr comes from: the founders, the methodology behind the book and how it became a platform for the whole Capex cycle.
7 min read
Capex Maturity Assessment
What's yourCapex maturity level?
Answer a short set of questions on process, data, visibility and cash flow, and get a report showing your level in each area.
Take the assessmentCapex basics
Common questions,answered directly.
What is capex?
Capex, short for capital expenditure, is money an organisation spends to acquire, build, upgrade or extend the life of a long-term asset such as a plant, machine, building or major system. Because the asset delivers value over several years, the cost is capitalised on the balance sheet and depreciated over its useful life.
What are the main types of capex?
Most industrial groups classify capital investment into four categories: maintenance capex to keep existing assets running, compliance capex required by safety or environmental regulation, growth capex to add capacity or enter new markets, and strategic capex that changes the shape of the business. The categories matter because they compete for the same envelope under different rules.
How is capex calculated?
Capex for a period is commonly derived as the change in net property, plant and equipment plus depreciation and amortisation for that period, or read directly from purchases of property, plant and equipment in the investing section of the cash flow statement.
What is maintenance capex?
Maintenance capex is capital spend required to keep existing assets operating at their current capability. It includes replacements, major overhauls and end-of-life renewals. It is largely non-discretionary, and in asset-heavy industries it typically consumes the majority of the capital budget before any growth investment is considered.
Who owns capex in an organisation?
Ownership is shared. Sites and business units originate requests, finance validates the case and the budget, the CFO and executive team allocate the envelope, delegated approvers authorise individual investments, and project owners deliver them. Capex governance exists to keep those handovers connected.
What is a capex plan?
A capex plan is the prioritised, multi-year set of capital investments an organisation intends to make, with cost profiles, timing and the strategic objective each investment serves. It sits between long-term capital strategy and the annual approved capital budget.
How is capex tracked after approval?
Approved capital is tracked as committed cost, actual spend and forecast at completion against the approved baseline, usually reconciled with the ERP. Deviations are escalated, scope changes are re-approved at the correct authority level, and a post-investment review compares the delivered outcome with the case.
See capex governedin one platform.
Plan, approve, track and report capital investment without spreadsheets in between.
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