Interior vs. Exterior Painting: What You Need to Know

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Whether you're giving your home a fresh look or preparing it for sale, painting is one of the most cost-effective ways to transform a space. But when it comes to painting, there's a big difference between interior and exterior jobs.

If you're planning to tackle this project in Australia, it's important to know the distinctions between these two types of painting, not just in terms of aesthetics, but also with regard to regulations, preparation, and materials. Here's everything you need to know.

1. Interior Painting: Focus on Finish and Durability

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Materials Matter

When it comes to painting interiors, the choice of paint is critical for ensuring longevity and aesthetic appeal. Interior paints are designed to withstand frequent cleaning and are usually less toxic, emitting fewer volatile organic compounds (VOCs). This is crucial for indoor air quality, especially in homes with children, pets, or elderly residents.

For interior painting in Australia, it’s advisable to opt for water-based paints for most rooms, as they dry quickly, emit less odour, and are easier to clean. High-traffic areas like hallways and kitchens may benefit from semi-gloss or satin finishes, which are more durable and easier to wipe down. For bedrooms and living rooms, a matte or eggshell finish is often preferred for its smooth appearance.

Legal Considerations

While interior painting may seem straightforward, certain safety standards must be followed. For instance, if your home was built before 1970, there’s a chance that lead-based paint could have been used. Lead paint removal is strictly regulated in Australia, and if you suspect its presence, you’ll need to hire a professional painter trained in lead removal. Lead paint exposure is a serious health hazard, so always err on the side of caution.

Preparation Is Key

Preparing your walls is just as important as choosing the right paint. Before starting an interior painting project, clean the walls to remove dust, grease, and stains. Patch up any holes or cracks and sand the surface to ensure a smooth finish. If your walls have been previously painted in a dark or vibrant colour, applying a primer will help the new paint adhere properly and ensure an even finish.

2. Exterior Painting: Weather Resistance and Protection

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Tougher Paint for Tougher Conditions

Exterior paint is designed to withstand the harsh Australian elements—whether it's the intense summer sun, heavy rains, or coastal salt spray. For this reason, exterior paints contain more additives that protect against UV rays, mould, and moisture damage. These paints are also typically oil-based or high-performance latex to ensure a long-lasting finish.

If you live in coastal regions, you may need paints that offer additional protection against salt air corrosion. For homes in bushfire-prone areas, check local council regulations, as some regions may have specific guidelines on fire-retardant coatings.

Adhering to Australian Standards

Just like with interior painting, there are legal requirements when painting the exterior of your home. Most local councils have guidelines about the type of paints that can be used, especially if you live in a heritage-listed home. Always check with your council for any restrictions before starting your exterior painting project.

Additionally, you may need scaffolding if your home has multiple levels, which requires proper setup by a licensed professional to ensure safety. Safety measures like this are non-negotiable under Australian law, so don’t cut corners by opting for makeshift solutions.

Weather and Timing

When painting exteriors, timing is everything. Australian weather can be unpredictable, and exterior paint jobs need dry conditions to cure properly. Avoid painting during wet or humid weather, as this can cause bubbling or peeling. The best time to paint is in the mild temperatures of autumn or spring, when the weather is cooler and more stable. Avoid painting in extreme heat as well, since it can cause the paint to dry too quickly, leading to cracks or an uneven finish.

3. Cost Considerations and Time Investment

Interior Costs

The cost of an interior painting project in Australia varies depending on the size of the space, the complexity of the job, and the type of paint used. On average, you can expect to pay between $15 to $30 per square metre for interior painting, with higher rates for premium finishes or detailed work like cornices and skirting boards. If you're hiring a professional painter, be sure to get a written quote and ask if it includes preparation work, as this can significantly affect the final price.

Exterior Costs

Exterior painting is generally more expensive due to the added difficulty of working at heights, the durability of materials required, and the need for weather-resistant paint. Expect to pay between $20 to $50 per square metre. If your home has complex architectural features or you need scaffolding, costs will be higher.

4. Hiring a Professional Painter

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Whether you’re painting the interior or exterior of your home, hiring a professional is often the best option. Not only will a professional have the necessary skills and experience to deliver a high-quality finish, but they'll also be up to date on the latest regulations and safety requirements.

Platforms like ServiceSeeking.com.au make it easy to find reliable, qualified painters who can provide quotes and reviews from past clients. Hiring a professional ensures that the job is done efficiently, safely, and in compliance with local laws—giving you peace of mind and a beautifully painted home.

Conclusion

Interior and exterior painting are two very different beasts, each requiring specific materials, preparation, and attention to detail. By understanding the key differences and following Australian regulations, you’ll ensure a successful, long-lasting paint job that enhances your home’s appearance and protects it from the elements.

And remember, when in doubt, consult a professional painter to get the job done right the first time!