Treated Timber vs Untreated Timber

07 11 2025

Treated Timber vs Untreated Timber: What’s the Difference and Which Should You Choose?

When planning a garden or home improvement project, the type of timber you choose can make all the difference. At Snowdon Timber Products Ltd, we supply a wide range of both treated and untreated timber across North Wales and the UK, helping homeowners, landscapers and tradespeople find the right materials for their projects.

If you’re unsure whether you really need treated wood or if untreated timber will do, this short guide will help you decide.

What Is Treated Timber?

Treated timber, often called pressure-treated wood, is natural wood that has been infused with preservatives under high pressure. This process protects it from rot, decay, insect damage and moisture, making it much more durable and ideal for outdoor use.

At Snowdon Timber, our pressure-treated green timber is one of the most popular options for decking, fencing, garden sleepers and outdoor structures. It’s designed to last for years, even in tough British weather.

Built to Last: Resistant to rot, decay and damp conditions.
Low Maintenance: Needs fewer coatings and treatments over time.
Good Long-Term Value: Slightly higher initial cost but a much longer lifespan.
Versatile: Suitable for everything from garden borders and raised beds to full decks and fences.

Typical uses: decking boards, sleepers, fencing, sheds, pergolas and landscaping projects.

What Is Untreated Timber?

Untreated timber is wood in its natural state. It hasn’t been pressure-treated or chemically protected, so it’s best suited for indoor use where it won’t be exposed to damp or harsh weather.

Because it retains its natural appearance and grain, untreated timber is a great choice for furniture, shelving and panelling where a warm, authentic wood look is part of the design.

Why Choose Untreated Timber

Natural look and feel that highlights the wood’s grain.
Easy to work with, cut and sand.
Can be stained, oiled or painted to suit any style.

Typical uses: interior cladding, shelving, furniture making, skirting boards and craft projects.

In general, treated timber is best for outdoor durability, while untreated timber works well indoors for decorative and practical uses.

For decking or fencing, treated timber is the best choice because it’s designed to resist rain, moisture, and rot.

For indoor shelving or wall panelling, untreated timber works better — it provides a smooth, natural finish ideal for interior spaces.

For garden sleepers or raised beds, treated timber is recommended as it can handle soil contact and outdoor exposure.

For DIY crafts or furniture, untreated timber is ideal since it’s easier to cut, shape, and customise.

Where to Buy Treated and Untreated Timber

We stock a wide range of treated and untreated timber at both our Bangor and Mochdre sites, with delivery available across most of the UK.

Whether you’re building a garden deck, a raised bed or bespoke shelving, our team can help you choose the right wood for your project.

Both treated and untreated timber have their advantages. The right choice simply depends on how and where you plan to use it. If you’re unsure which option is best, speak to our team at Snowdon Timber. We’ll be happy to help you select the most suitable material and ensure your project lasts for years to come.

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