Published on 7 August 2026
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To sand decking, start by cleaning the boards thoroughly and letting them dry completely, at least 48 hours. Fix any raised screws or protruding nails, then sand along the grain using an orbital sander with 60 – 80 grit paper, followed by a finer pass at 100 – 120 grit. Remove all dust before applying your chosen finish: oil, stain or decking paint. Plan for a dry window of at least two days.
Decking gets affected the most after a British winter. UV exposure, rain, foot traffic and temperature swings all leave their mark, greyness, surface cracking, raised grain, and the odd splinter. By late spring, a deck that looked smart twelve months ago can feel worn and tired.
Most timber decking responds well to sanding. A single day’s work with the right equipment and the right process can take boards back to a clean surface that holds a fresh finish properly and lasts for several more seasons.
Not every deck needs sanding every year. Before you hire a machine, a five-minute assessment saves you time and protects the boards. Timber decking can only be sanded so many times before it becomes too thin.
Poor preparation is the most common reason a deck sanding job fails to last. Sanding dirty, damp or structurally loose timber produces a finish that lifts or stains within weeks. Work through this sequence before a sander touches the surface.
This is where most DIY guides give the same vague advice: ‘use a power sander.’ The choice of machine actually matters quite a lot for decking, because decking boards are long, fairly soft, and intolerant of aggressive sanding.
An orbital sander is the recommended tool for the majority of domestic decking projects. It removes material evenly without leaving directional scratches, is straightforward to control, and handles the softwood and hardwood timbers most commonly used for garden decking. It’s also gentle enough not to cut through thinner boards if you maintain a steady pass.
Our orbital sander hire is well-suited to this kind of work; the same machine used for interior floor sanding handles exterior decking effectively, provided the boards are flat and in reasonable condition. See our guide to choosing the best floor sander for a home DIY project if you’d like a fuller comparison of machine types before you book.
A belt sander removes material faster and is useful when the surface is badly degraded or carries a thick, old finish that resists lighter sanding. The trade-off is that it’s more aggressive and demands more control; running with the grain at all times is essential, and pausing in one spot risks creating a hollow.
The main machine can’t reach into the last few centimetres along the edge of the deck, against walls or posts, or around any fixed features. An edging sander handles those areas. If your deck borders a wall on multiple sides, it’s worth hiring one alongside the main orbital. We cover the edging sander’s uses in more depth in our floor sanding accessories and guides.
A good orbital sander costs upwards of £100 – £200 to buy, and a professional-grade machine significantly more. For a single decking project, hiring gives you the right tool for the job at a fraction of the cost, with no storage to worry about afterwards.
See our hire range and pricing
Fit your orbital sander with 60 – 80 grit abrasive paper. This is coarse enough to cut through weathered timber, lift old finish and remove surface greyness in a reasonable number of passes, without being so aggressive it tears into sound wood.
Work in the direction of the grain, along the length of each board, never across it. Move the sander at a steady walking pace, keeping it moving at all times.
Pausing creates a low spot. Overlap each pass slightly so you don’t leave unsanded lines between runs.
Once the main sanding pass has removed the weathered surface and old finish, switch to a finer 100 – 120 grit paper and go over the boards again. This second pass removes the scratches left by the coarser paper and leaves a smooth surface that takes oil or stain evenly.
Use the edging sander to work the perimeter of the deck and anywhere the orbital couldn’t reach. Match the grit sequence, coarse first, then fine, to keep the surface consistent.
Sanding produces a significant amount of fine dust that will ruin any finish applied over it. Vacuum the entire deck and the gaps between boards, then wipe down with a slightly damp cloth. Allow the surface to dry fully before opening any finish.
Sanded timber is bare and absorbent. Left unprotected, it will grey again within weeks. Apply your chosen finish the same day, or within 24 hours at the latest.
Apply in dry conditions between 10°C and 25°C, not in direct strong sunlight, it dries too fast and leaves brush marks. Allow 24 to 48 hours before foot traffic for oil; longer for paint.
For a typical domestic deck of around 15–25 square metres, a single day is realistic for the full process, prep in the morning, sanding through the day, finishing in the late afternoon. Larger or more complex decks with multiple levels or tight borders may need two days. Allow additional drying time before the space is back in use.
The full process, assessing, prepping, sanding and finishing, is well within reach for a DIYer with the right equipment and a clear day. The most important thing is to work in the right sequence and not rush the drying stages.
We hire orbital sanders, edging sanders and the abrasives you’ll need for a decking project, with delivery across London. Browse our sander hire range or take a look at our hire pricing page to plan your weekend project. Not sure which machine is right for your deck? Get in touch, and we’ll help you choose.
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