Property Maintenance Standards Under Review as Insurance Claims Rise 40%

What the Data Shows About Maintenance Failures

The Insurance Council’s latest report reveals a stark pattern: properties with documented maintenance records suffer 65% less weather damage than those without. The most common failures involve basic exterior maintenance — blocked gutters, failed roof flashings, and deteriorated sealants around windows and doors.

Canterbury leads damage claims with 2,847 weather-related incidents in 2025, followed by Wellington with 2,203 cases. Auckland, despite its larger housing stock, recorded 1,956 claims — suggesting better maintenance practices in the region’s newer housing stock.

For example: A Christchurch property suffered $47,000 in internal water damage after blocked gutters caused overflow during a three-day storm event. The insurer’s assessment found debris accumulation dating back 18 months, with no evidence of regular cleaning. The claim was partially declined, leaving the owner with a $23,500 shortfall.

Note: Properties built before 2000 show significantly higher claim rates, with monolithic cladding systems particularly vulnerable when maintenance is deferred.

Proposed Mandatory Maintenance Schedules

The Building Industry Federation’s submission to the Ministry of Business, Innovation and Employment outlines specific maintenance intervals for different building elements. The proposal requires property owners to maintain records and obtain compliance certificates every five years.

The suggested schedule includes:

• Annual gutter and downpipe cleaning and inspection
• Bi-annual roof and flashings inspection
• Three-year exterior paintwork and sealant assessment
• Five-year full building envelope inspection by qualified practitioners
• Annual drainage and stormwater system checks

Compliance certificates would require sign-off by Licensed Building Practitioners for structural elements and qualified tradespeople for specific systems. The cost for a full five-year inspection is estimated at $2,800-4,200 for an average three-bedroom home, depending on complexity and regional rates.

Note: The proposal excludes apartments and units under body corporate management, as these typically have established maintenance regimes under Unit Titles Act requirements.

Regional Variations and Climate Factors

The data shows clear regional patterns tied to local climate conditions. West Coast properties face unique challenges with high rainfall and salt exposure, while Central Otago deals with extreme temperature cycling that stresses building materials.

Wellington’s seismic activity adds another dimension — maintenance schedules must account for settlement and movement that can compromise seals and fixings. The proposed standards include specific provisions for properties in seismic zones requiring additional inspection of structural connections and weatherproofing systems.

For example: A Nelson property’s north-facing weatherboard cladding showed significant UV damage after five years without repainting. When storm-driven rain penetrated the degraded coating, internal framing moisture content reached 25% — well above the 18% threshold that triggers decay risk under NZS 3604.

Cost Implications for Property Owners

The proposed maintenance regime carries significant cost implications, particularly for older properties requiring catch-up work. Industry estimates suggest average annual maintenance costs would increase from the current $1,200-1,800 to $2,400-3,600 for properties over 20 years old.

However, proponents argue this investment prevents larger repair bills. The Insurance Council data shows properties with regular maintenance average $2,300 in weather damage costs over five years, compared to $8,900 for poorly maintained buildings.

Property developers are concerned about compliance costs affecting project viability. A 50-unit development would face ongoing maintenance obligations worth $120,000-180,000 annually once buildings reach the 15-year threshold.

Note: The proposal includes provisions for staged implementation over three years, allowing property owners to spread initial compliance costs.

Industry Response and Technical Concerns

The Master Builders Association supports the framework but questions enforcement mechanisms. They argue that without proper oversight, the system could become a paper exercise rather than genuine maintenance improvement.

Licensed Building Practitioners have raised concerns about liability exposure from compliance certificates. The current proposal requires practitioners to certify work they haven’t directly supervised, creating potential professional indemnity issues.

Technical challenges include defining acceptable maintenance standards for different building types. A 1970s brick veneer home requires different attention than a 2010s cavity construction system, yet the proposed framework treats them similarly.

For example: Cavity construction requires specific moisture management that wasn’t part of earlier building practices. Inspectors need different qualifications to assess these systems properly, yet the current LBP framework doesn’t distinguish between building eras.

What This Means for Current Practice

Even without mandatory requirements, insurance companies are already tightening policies around maintenance. Several major insurers now require evidence of recent gutter cleaning and roof inspections for claims involving water damage.

Property managers and body corporate committees should start documenting maintenance activities more thoroughly. Digital records with dated photos and contractor certificates provide the evidence insurers increasingly demand.

The trend toward performance-based insurance pricing means well-maintained properties will likely benefit from lower premiums, while poorly maintained buildings face higher costs or coverage restrictions.

Steps to Take Now

Start documenting your property’s maintenance history immediately, even before any mandatory scheme begins. Create a simple spreadsheet recording dates, work performed, and contractor details.

Establish relationships with qualified local tradespeople for regular maintenance tasks. Book annual gutter cleaning and arrange bi-annual roof inspections — these prevent most weather-related damage and cost far less than repairs.

Review your insurance policy’s maintenance requirements carefully. Many policies already contain clauses about reasonable care that could affect claims if maintenance is clearly lacking.

Consider a professional building inspection for properties over 15 years old to identify potential issues before they cause damage. The $800-1,200 cost often pays for itself through early problem detection.

Budget for increased maintenance costs regardless of whether mandatory schemes proceed — insurance companies and market forces are already driving this direction. For more information, visit Rgc.