The Real Cost of Maintaining a Property Over Ten Years

The Real Cost of Maintaining a Property Over Ten Years

Domira Team March 25, 2026 3 min read

Maintenance is treated as an occasional surprise. Planned across a decade, it becomes a predictable and much smaller number.

Owners budget for purchase and then meet maintenance as a series of unwelcome events. Most of those events are predictable, because building components have known service lives, and planning for them converts emergencies into scheduled expenditure.

What this number does and does not include

This covers maintaining a residential property in good condition over a decade of ownership. It excludes improvements that change the property and any costs covered by service charges in a shared building.

Air conditioning

Servicing, repairs and eventual replacement of cooling equipment, which works hard in this climate and is the most consequential system in the house.

  • Pushes it up: Deferred servicing, undersized units running continuously and poor installation.
  • Brings it down: Regular servicing, which extends life substantially and maintains efficiency.
  • How to control it: Budget for replacement of units on a rolling basis rather than facing them all at once, and service annually before the summer.

Waterproofing and roof

Maintaining the building envelope against water, including flat roofs, wet areas and external joints.

  • Pushes it up: Ageing membranes, ponding due to blocked drains and neglected penetrations.
  • Brings it down: Annual inspection and clearing of drains, which prevents the failure mode that causes the most damage.
  • How to control it: Inspect before the rainy season each year. Waterproofing failures discovered early are repairs; discovered late they are reconstruction.

Plumbing and water systems

Pipework, water heaters, pumps, tanks and the fittings that use them.

  • Pushes it up: Hard water, older galvanised pipework and heaters running past their service life.
  • Brings it down: Replacing heaters before they fail, since failure usually includes water damage.
  • How to control it: Track the age of water heaters and pumps and replace proactively, because the cost of failure exceeds the cost of replacement.

Electrical systems

Distribution boards, protective devices, fixtures and the safety of the installation over time.

  • Pushes it up: Older installations, added loads over time and informal alterations.
  • Brings it down: Periodic inspection and correcting problems as they are found.
  • How to control it: Have the installation inspected periodically, particularly in older properties or after alterations.

Finishes and decoration

Paint, sealants, flooring and surfaces that wear visibly and affect both living quality and resale.

  • Pushes it up: High occupancy, rental turnover and low quality original materials.
  • Brings it down: Repainting on a planned cycle rather than waiting until it is unavoidable.
  • How to control it: Plan redecoration on a cycle, since a property maintained continuously never requires a large restoration.

External works and landscaping

Boundary walls, gates, paving, drainage around the building and any planting.

  • Pushes it up: Irrigation leaks, settlement of paving and poorly drained areas against the building.
  • Brings it down: Keeping drainage clear and addressing settlement early.
  • How to control it: Watch where water goes during rain. Most external problems begin as drainage problems.

Costs that never appear on the first page

  • Emergency callout premiums when a failure occurs outside working hours.
  • Consequential damage when a failure, particularly water related, affects finishes.
  • Loss of rent during repairs in a rented property.
  • The compounding cost of deferring, since small repairs become large ones.

Keeping the budget honest

Build a ten year maintenance plan from component service lives rather than a percentage of value. List the major items, their age and expected replacement point, and spread the cost across the years. The total is usually lower than owners fear and the timing becomes controllable.

  • Annually before summer, for cooling systems.
  • Annually before the rainy season, for roofs and drainage.
  • When any component reaches the end of its expected life.
  • Before letting or selling, when condition directly affects income or price.

If you are buying, selling or investing, Domira can verify the documents, assess the property and build the numbers with you before you commit to a transaction.

Frequently Asked Questions

Is a percentage of property value a good maintenance budget?

It is a starting point but a poor guide, because maintenance depends on the age and condition of components rather than on what the property is worth. A schedule built from the actual systems in your property produces both a better number and a plan for when to spend it.

Which maintenance should never be deferred?

Anything involving water and anything involving electrical safety. Water damage compounds quickly and affects finishes and structure, while electrical faults carry safety consequences. Both are inexpensive to address early and expensive in every other sense later.

Should I use the same contractor for everything?

A reliable general contractor is useful for routine work and small repairs, but specialist systems such as air conditioning, lifts or waterproofing benefit from specialists. What matters most is keeping records of who did what, so the history of the building exists somewhere other than memory.

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