What Do I Treat My Wooden Garden Furniture With?

If you're standing in the garden with a tin of something in one hand and a brush in the other, asking what do I treat my wooden garden furniture with, the short answer is this: it depends on the timber, the finish you want, and how much upkeep you're willing to do.

Quick answer: For untreated softwood, start with an exterior wood preservative. For furniture where you want to retain a natural timber appearance, a compatible exterior oil is often appropriate. For more colour and UV protection, use an exterior wood stain. If the furniture is already pressure treated, follow the manufacturer's care guidance before adding another finish.

Important for Detailed Outdoor Living furniture: treatment requirements vary by range. Classic Redwood furniture should be maintained with the recommended furniture oil in line with the product care guidance, while Heritage Tanalised products use pressure-treated timber and have different maintenance requirements. Always follow the care information supplied for your specific product.

Oil, stain or preservative: which should you choose?

Choose preservative when untreated exterior timber needs protection against biological decay. Choose oil when you want a natural-looking finish that is straightforward to refresh. Choose stain when colour retention and additional UV protection matter. Do not assume that adding more products means more protection: incompatible coatings can reduce adhesion and create a patchy finish.

What do I treat my wooden garden furniture with first?

Start by checking whether the furniture is already treated. That matters more than the product label on the shelf.

If your furniture is pressure treated, it has already been protected against rot and decay during manufacture. In that case, the first job is usually not heavy treatment but maintenance. You may want to add a water-repellent top-up, a stain for colour, or a furniture oil if the manufacturer recommends it. If it is untreated timber, you will normally need a proper exterior wood preservative before thinking about appearance.

The main treatments for wooden garden furniture

Wood preservative

A preservative is about protection first. It helps guard against fungal decay, moisture and insect attack. This is the best starting point for untreated softwood furniture that will live outdoors all year.

Exterior wood oil

Oil is often used when you want to keep a natural timber appearance rather than create a painted or heavily stained look. It can help repel water, reduce surface drying and bring out the grain.

Exterior wood stain

A stain adds colour, helps with weather resistance and can provide better UV protection than a clear treatment.

How to apply treatment properly

Clean the furniture first and allow it to dry fully. If an old finish is flaking, prepare the surface before recoating. Apply thin, even coats in the direction of the grain and follow the drying times and recoat instructions on the product. Pay particular attention to end grain and exposed horizontal surfaces.

How often should you retreat wooden garden furniture?

There is no fixed timetable for every product. Inspect the furniture in spring and autumn. If water no longer beads, the finish looks dry or the timber has become noticeably more absorbent, check the manufacturer's maintenance guidance. Exposure, finish and usage all affect the interval.

Common mistakes to avoid

Do not use indoor-only wood finishes outside. Do not coat damp timber. Do not mix incompatible oil, stain, wax or sealed finishes without proper preparation. And do not treat pressure-treated timber simply because a generic guide says all garden furniture needs annual coating: the product-specific instructions should take priority.

Related care guides and products

For broader maintenance advice, read our Treatment and Maintenance Advice and How to Protect Wooden Garden Furniture guides. You can also browse our wood treatment products and compare wooden garden benches and chairs.