Repair, replace, or wait — how to decide

Your boiler is 14 years old and needs a €400 repair. A new one costs €3,500. Someone tells you “just replace it — it’s old anyway.” Someone else says “repair it — why spend thousands?”

They’re both guessing. Here’s how to actually decide.

The annual cost method

Professional property managers don’t compare upfront costs. They compare annual costs — what each option costs you per year of use.

Option A: Repair

The component stays. You fix the specific defect.

Repair cost:               €400
Estimated remaining life:  6 years
Annual cost of repair:     €400 / 6 = €67/year

Option B: Replace

Remove and replace the entire component.

Replacement cost:          €3,500
New expected lifespan:     15 years
Annual cost of replacement: €3,500 / 15 = €233/year

Option C: Defer

Do nothing (or apply a minimal stopgap) and plan for replacement later.

Stopgap cost:              €0-100
Risk:                      Component may fail unexpectedly
Future replacement cost:   €3,500 × inflation over waiting period

In this example, repair wins decisively — €67/year vs. €233/year. The boiler has 6 more years in it. Replacing it now means paying for 6 years of life you’re throwing away.

When replacement makes sense

The numbers flip when:

• Repair cost exceeds 50% of replacement cost, and less than 30% of lifespan remains. At that point, you’re putting serious money into a component that’s nearly spent. The repair buys you little time for a lot of money.

• The defect is systemic, not isolated. If the repair fixes one joint but three others are degrading, you’ll be back in six months. Systemic failures mean the component is done, not just damaged.

• Non-financial factors override the math. Safety, energy performance regulations, insurance requirements, or building codes may force replacement regardless of the financial calculation. The math tells you what’s cheapest — it doesn’t tell you what’s legal or safe.

When deferral is smart

Deferral gets a bad reputation, but there are situations where doing nothing is the right call:

• Replacement is already scheduled within 1-2 years. If the roof is being replaced next year, spending €800 on a gutter repair today is paying twice. A €50 stopgap (temporary sealant) buys you the time.

• A contractor is already booked for other work. Bundling this repair with an existing visit saves you a second call-out fee and may get you a better rate.

• Conditions aren’t right. Exterior painting in November in Helsinki is a waste of money. Some work needs to wait for the right season.

The cost of doing nothing

Sometimes people defer not because it’s strategic, but because they don’t want to deal with it. That has a cost too.

Here’s the calculation for skipping maintenance on wooden window frames:

Frame replacement cost:           €750/m²
Remaining life WITH painting:     30 years
Remaining life WITHOUT painting:  15 years
Painting cost:                    €40/m²
Painting cycle:                   every 5 years

Annual cost without maintenance:  €750 / 15 = €50/m²/year
Annual cost with maintenance:     €750 / 30 = €25/m²/year
Cost of neglect per year:         €50 - €25 = €25/m²/year
Annual cost of painting:          €40 / 5 = €8/m²/year

Skipping the paint job costs you €25/m² per year in reduced frame life, but painting only costs €8/m² per year. Every year you skip it, you’re losing three times what it would have cost to do it.

Decision record

Whatever you decide — document it. Write down:

• Which option you chose and why
• The numbers at the time of decision
• A date to revisit (especially if you chose to defer)

Future you — or whoever takes over maintenance of this property — will thank you for the context.