A Guide to Common Fireplace Challenges (and How to Solve Them)
Even small mistakes in fireplace installation can lead to costly repairs or safety issues. In this guide you'll discover the most common problems seen in New Zealand homes - and how expert review and planning can prevent them.
Fireplaces are one of the most desirable features in Kiwi homes - offering warmth, comfort and timeless design appeal. Whether you’re adding a sleek inbuilt fireplace to a modern build or replacing a fireplace in an older home, a well-planned installation makes all the difference.
However, fireplace installations in New Zealand often come with challenges. Between council consents, installation compliance and incorrect material selection, small mistakes can turn into big problems.
Compliance and Consent Complications
One of the most frequent mistakes homeowners make is skipping or misunderstanding building consent. Each New Zealand council has unique rules, and failing to follow them can cause costly delays or even require removal of the appliance.
Common issues:
Missing building consent approvals
Using non-compliant flue systems or incorrect clearances
Installing fireplaces that don’t meet clean air standards in restricted zones
Overlooking cavity ventilation
Pro tip: Work with a certified installer who understands the NZ Building Code (Clause C/AS1 and AS/NZS 2918). This ensures your fireplace meets safety, emissions, and performance standards right from the start. www.nzhha.co.nz
Incorrect Flue Installation or Poor Draft
A fireplace’s performance depends heavily on its flue design and installation. Poor airflow, wrong flue height, or excessive bends can cause smoke spillage, reduced efficiency, and safety hazards.
Common flue problems:
Flue not high enough above the roofline
Too many directional changes
Clearances from combustibles not maintained
Leaks where the flue penetrates ceilings or roofs
Installing designer shrouds around cowls and blocking dishcharging emissions
Pro tip: Always use manufacturer-approved flue kits and have them installed by a qualified fireplace technician. In New Zealand’s windy regions, flue terminal placement and cowl selection are crucial for reliable performance.
Structural and Clearance Challenges
Modern architectural homes often present clearance and structural challenges. With feature walls, open plans, slab ducting and unique finishes, installation may require additional planning.
Common issues:
Timber framing too close to the firebox
Inadequate hearth or load support
Poor ventilation in cavity installations
Non-combustible zones not clearly defined
Not providing for air replacement ducting at the time the slab is poured
Incorrect mantel height
Pro tip: Involve your fireplace consultant or installer during the design stage. Early input helps builders and architects meet all clearance, framing, and ventilation requirements - saving time and costly modifications later.
Selecting the Wrong Finishing Materials
Even if the fire is installed perfectly, incorrect finishing materials can ruin the result — or create safety risks.
Common finishing mistakes:
Using standard plasterboard or fire resistant board instead of heat-resistant board
Applying non-heat-resistant paint, veneer, or timber too close to the unit
Installing decorative panels that crack or warp
Skipping thermal expansion gaps around the appliance
Pro tip: Choose heat-resistant materials (heat resistant board, non-combustible stone or tile, high-temp adhesives). Always follow the manufacturer’s clearance guidelines to maintain safety and warranty protection.
Poor Coordination Between Trades
Fireplace installations often involve multiple trades — builders, electricians, gasfitters, stonemasons, cabinet makers and plasterers. When coordination breaks down, mistakes follow.
Typical coordination problems:
No pre-slab ducting for air
Wall linings installed too early
Access panels covered over
Plasterboard dust entering the fire
Fireplace convection vents blocked by bespoke frames or hearth placement
Pro tip: Appoint one lead installer or project manager (ideally your fireplace specialist) to coordinate trades. Clear communication and scheduling prevent rework and ensure the fireplace integrates seamlessly into your build.
Choosing the Wrong Fireplace for the Space
Not all fireplaces suit every room or home. Undersized units won’t provide adequate heat, while oversized ones can overheat or waste energy. Airtight new builds may also require specific ventilation systems and dedicated air supply.
Pro tip: Have a professional calculate your home’s heating needs and recommend a model suited to your insulation, room volume, and layout. This ensures efficiency, comfort, and compliance with NZ air quality regulations.
Weather and Environmental Factors
New Zealand’s unique climate zones — coastal, alpine, and urban — each affect fireplace performance differently.
Common environmental challenges:
Wind exposure causing smoke downdrafts
Moisture and exposed tall flues affecting chimney draw
Corrosion in coastal environments
Pro tip: Use insulated flue systems in cold climates, quality flashings and well-designed cowls. Position your flue according to prevailing winds and local terrain for reliable, long-term performance.
How to Avoid Fireplace Installation Problems
Most fireplace installation issues can be avoided with early planning and professional input.
Before starting your project:
Engage a fireplace specialist early in your design process
Use certified installers who understand NZ building and emission codes
Choose heat-resistant finishing materials for surrounds and walls
Ensure trade coordination during construction
Match the fireplace type and size to your home and heating needs
A properly planned fireplace installation won’t just meet compliance - it’ll perform beautifully and safely for years to come.
Whether you’re building new or renovating, a well-installed fireplace adds comfort, efficiency, and value to your home. By understanding these challenges and working with professionals familiar with New Zealand’s codes and climate, you’ll ensure your investment delivers long-term warmth and peace of mind.
If you're experiencing issues with your fireplace installation, from smoke spillage to cracked walls or compliance concerns, Designs for Fires can review your installation, identify the cause and provide expert solutions with a detailed report.