Why Can Homeowners Legally Paint and Tile Their Own Homes?

Many homeowners are surprised to learn that they can legally paint their own house or install their own tiles in New Zealand. In fact, painting and tiling have never been classed as Restricted Building Work, which means there is currently no requirement for a Licensed Building Practitioner (LBP) to carry out these tasks.

The reason comes back to what the Building Act was designed to regulate. The licensing regime focuses primarily on work that affects a building's structure, weathertightness, and safety. Foundations, framing, roofing, cladding, and other critical building elements can cause serious hidden defects if installed incorrectly. These are the areas where licensing and supervision requirements apply.

Painting and tiling sit in a different category. They are generally considered finishing trades. While both play an important role in protecting a building, defects in the finishes themselves are often visible and can usually be identified and remedied before they create major structural issues.

That doesn't mean they are unimportant.

Paint is often the first line of defence for exterior timber. A quality paint system helps protect cladding from moisture, UV exposure, and weathering. It acts as a protective coating over the building envelope, helping extend the life of timber weatherboards, fascia boards, trim, and other exposed surfaces.

This is something we see regularly during leak investigations and maintenance work. Homeowners often think of paint as purely cosmetic, but in reality it plays an important role in protecting the timber underneath. We've inspected homes where the paint still looked reasonably sound from a distance, only to find the timber behind it had already started to deteriorate.

One of the most common issues we encounter is unsealed cuts, joins, and fixings. We've found that many areas of decay start at places homeowners rarely notice — cut ends of weatherboards, fascia joins, screw penetrations, light fittings, brackets, and service penetrations. These small openings may seem insignificant, but water doesn't need a large opening to cause damage. Given enough time, even a small area of exposed timber can absorb moisture and begin the deterioration process.

It's also worth noting that many factory-coated or pre-primed timber products still require preparation and painting in accordance with the manufacturer's recommendations. The coating applied at the factory is often intended to protect the timber during transport and storage, while the final paint system provides the long-term protection against weather exposure and moisture ingress. When paint coatings fail, timber can absorb moisture, leading to deterioration, decay, and costly repairs over time.

Likewise, tiles provide a durable, easy-to-clean surface that helps protect walls and floors from everyday wear and moisture. Whether you're installing a kitchen splashback, laundry floor, bathroom wall tiles, or an entranceway, the quality of the installation still matters. Poorly laid tiles can crack, debond, allow moisture penetration, or simply fail to perform as intended.

It is also important to understand where the finishing trades end and the regulated building work begins.

While homeowners can legally paint and tile their own homes, the building elements behind those finishes are often subject to much stricter requirements. Structural framing, load-bearing components, roofing, cladding systems, and many weathertightness elements fall within Restricted Building Work and generally must be carried out or supervised by a Licensed Building Practitioner (LBP) when building consent is required.

In wet areas such as bathrooms and showers, the waterproof membrane behind the tiles is arguably the most critical component of the entire system. It's worth noting that internal wet-area waterproofing is not currently classed as Restricted Building Work under the LBP scheme. However, membrane installations typically need to be installed in accordance with the manufacturer's specifications and commonly require approved applicators, producer statements (PS3s), warranties, and compliance documentation to satisfy councils, insurers, and future purchasers. While homeowners can legally install tiles themselves, many waterproof membrane systems require approved applicators to maintain warranties and provide the documentation often required for compliance and insurance purposes.

In our experience, the most expensive failures are rarely caused by the tiles themselves. More often, the problem lies behind the finished surface. We've investigated bathrooms where the tiles looked perfectly serviceable, but moisture testing revealed elevated readings within the wall structure or floor substrate. By the time the issue becomes visible, significant damage may already have occurred behind the scenes. In many cases, the cause can be traced back to poor waterproofing detailing, installation errors, movement within the building, or maintenance issues that have allowed moisture to bypass the system. The waterproofing membrane is the most important part of the system when it comes to protecting the structure and integrity of the property.

Put simply, the paint and tiles may be the visible finish, but the framing, structure, and waterproofing behind them are the parts that protect the building from long-term damage. These are the building elements that receive the greatest regulatory focus because failures are often hidden until significant damage has already occurred.

The Building Code itself is largely performance-based.

In simple terms, it is concerned with how a building element performs rather than prescribing every method that must be used to achieve that outcome. As long as the completed work meets the required performance standards for durability, moisture management, and intended use, there is often more than one acceptable way to achieve compliance.

This is where some debate exists within the tiling industry today.

Unlike structural building work, tiling is not currently a licensed trade in New Zealand. Industry organisations, training providers, and some manufacturers have advocated for greater regulation, training requirements, and licensing pathways for tilers and related trades.

As Jared Caldwell, Managing Director of Global Tile, has publicly noted, in New Zealand "anyone can pick up a trowel and call themselves a tiler." While industry standards and best-practice guides exist, the Building Code generally focuses on performance outcomes rather than prescribing a single installation method in every circumstance.

Across the Tasman, parts of Australia have been moving towards greater regulation of tiling and waterproofing-related work, with increasing emphasis on formal qualifications, competency standards, and documentation. Supporters of these changes argue that greater regulation can improve consistency, training, accountability, and workmanship across the industry.

For now, however, the position in New Zealand remains straightforward.

Homeowners are free to paint and tile their own homes, and tradespeople do not require an LBP licence to carry out this work.

From our perspective, the important question isn't whether a licence is required. It's whether the work is carried out properly and whether the completed system will continue protecting the building years down the track. Good workmanship, correct preparation, suitable products, and attention to detail will always matter more than simply ticking a box.

A well-painted exterior protects timber from the elements. A well-installed tile surface provides durability, hygiene, and moisture resistance. But behind both of those finishes sit the structural, weathertightness, and waterproofing systems that ultimately keep a building safe, dry, and compliant.

That's why New Zealand's licensing system focuses primarily on the critical building elements that can't easily be seen once construction is complete. While painting and tiling remain accessible trades for both professionals and DIY homeowners, the underlying structure and weatherproofing of the building continue to receive the greatest regulatory attention.