Deck Sanding in London
Outdoor Timber Restored, Treated and Sealed
Replacing a timber deck can cost thousands, but in many cases, professional restoration achieves the same visual result for a fraction of the price. Our hardwood deck sanding in London removes weathered fibres, grey UV damage, algae staining, splinters and surface deterioration, preparing the timber for long-lasting protection.
We restore softwood and hardwood decking, including pine, larch, ipe, teak and bangkirai, using specialist outdoor sanding and treatment systems. Every project includes moisture testing before finishing to ensure proper product performance. With 30+ years of experience, we help extend the life of your decking without replacement. Contact us today to get a free survey.
Free survey includes timber species identification, moisture assessment, and confirmation of which areas can be sanded. For indoor floor sanding, see our hardwood floor sanding service →
Softwood vs Hardwood Decking
Why the Treatment Approach Is Completely Different
Not all decking responds to sanding and finishing in the same way. Timber species affect everything from grit selection and sanding pressure to oil absorption rates and long-term maintenance requirements. Using the wrong treatment system can shorten the lifespan of the deck and lead to premature coating failure. We identify the timber species before work begins and tailor the restoration process accordingly.
Softwood Decking
Pine, Larch and Pressure-Treated Timber
Softwood decking is the most common decking type found in London gardens and terraces. Pine, larch and cedar boards absorb oils and preservatives readily, making preparation particularly important. Heavily weathered surfaces typically require 40–60 grit sanding to remove oxidised fibres and grey discolouration, while lighter weathering can often be treated with 80–100 grit abrasives.
Before any oil is applied, algae, mould and biological growth must be completely removed. We regularly use products such as Osmo Wood Protector, Ronseal Ultimate Decking Oil and Barrettine Premier Wood Preservative. Most softwood decks require two or three coats for full protection.
For pressure-treated softwood decking: allow 12 months after installation before oiling. The preservative treatment interferes with oil penetration until it has fully cured and dried from the timber, oiling too early produces a non-penetrating, sticky surface. This is the most common source of oiling failure on newly installed softwood decks and is not covered by any competitor softwood decking section.
Hardwood Decking
Ipe, Teak, Bangkirai and Balau
Dense hardwood decking requires a completely different restoration approach. Species such as teak, ipe and bangkirai contain natural oils that can interfere with the adhesion of applied finishes. After sanding to 80–100 grit, the surface is cleaned using a hardwood preparation treatment to remove surface oils before finishing begins.
Without this step, oils often remain on the surface and become sticky rather than penetrating the timber. Specialist products, including Osmo UV Protection Oil, Owatrol Textrol and Deks Olje D2, are commonly specified. Teak deck sanding in London requires less effort, because hardwoods are less porous, one or two coats are usually sufficient.
Composite and Mixed Decking
When Sanding Is and Isn’t Appropriate
Composite decking cannot be sanded in the same way as timber decking. Abrasive sanding damages the factory-manufactured surface layer and often leaves permanent marks. Where composite boards are combined with timber framing, fascias or handrails, only the timber elements can be restored through sanding.
Composite sections are professionally cleaned instead. During the survey, we identify exactly which areas can be sanded safely and which require alternative treatment methods. It prevents unnecessary damage while ensuring every part of the deck receives the correct restoration approach.
For timber decks that only need re-oiling without ull sanding, the same outdoor oil systems are used, see our wood floor oiling service → for the full product comparison including Osmo and Bona hardwax systems (noting that outdoor deck oils are distinct products from indoor floor oils).
The Moisture Content Rule
Why Timing Matters for Deck Oiling
Applying oil to wet timber is one of the main reasons decking finishes fail prematurely. When moisture levels are too high, the oil cannot penetrate properly and instead remains on the surface, where it becomes sticky, patchy and vulnerable to rapid weathering.
For outdoor decking, timber should generally be at 15–18% moisture content or below before any oil or preservative is applied. Freshly sanded decking often requires 24–48 hours of dry weather before finishing can begin, while recently rained-on decks may require 48–72 hours or longer, depending on conditions.
Every project includes a moisture assessment using a calibrated pin-type meter. We never apply finishing products to timber above acceptable moisture levels because doing so compromises performance and durability. Scheduling work around suitable weather conditions helps ensure the treatment penetrates correctly and provides long-term protection rather than failing after the first few weeks of exposure.
Anti-Slip Treatment
Safety on Wet London Decking
Decking becomes significantly more slippery when exposed to rain, algae growth and seasonal moisture. Where safety is a concern, anti-slip deck treatments in London can be incorporated into the restoration process. Anti-slip deck oils contain microscopic aggregate particles that improve grip without noticeably changing the appearance of the timber.
Osmo Anti-Slip Oil is one of the most commonly specified professional systems. For steps, ramps, and heavily used access routes, we also recommend anti-slip strips.
For commercial properties where public liability is a consideration: the HSE’s Slips and Trips guidance references pendulum test values (PTV) of 36 or above for low-risk areas. Anti-slip deck oil with aggregate additive typically achieves PTV 36–45 depending on deck texture and weathering, suitable for residential terraces and commercial low-risk areas. We confirm the appropriate anti-slip specification at the survey for commercial clients with specific compliance requirements. For commercial clients managing multiple properties, see our commercial floor sanding service →
Deck Sanding Cost in London
Deck restoration costs depend on timber species, weathering severity, accessibility and the finish system selected. Hardwood decks require additional pre-treatment and different products, placing them at a higher rate than softwood.
Softwood deck sanding + 2 coats deck oil
Sanding, algae removal preparation, 2 coats Osmo Wood Protector or equivalent
Softwood deck sanding + 3 coats deck oil
Full preparation, 3 coats for heavily weathered or high-exposure decks
Hardwood deck sanding + pre-treatment + 2 coats hardwood oil
Sanding, acetone pre-clean, 2 coats Osmo UV Protection Oil, Deks Olje D2 or Owatrol Textrol
Anti-slip oil additive treatment
Osmo Anti-Slip Oil in place of standard deck oil; additional aggregate for grip
Deck cleaning before sanding (algae-heavy decks)
Professional biocide wash and rinse before sanding begins
Step sanding and treatment
Individual step sanding and anti-slip oil treatment
A typical 20m² London garden deck – softwood pine, sanding and 2 coats of Osmo Wood Protector: £240–£320. The same deck in new softwood decking (materials and labour): £1,200–£2,500. Restoration at 10–25% of replacement cost. Compare with hardwood decking replacement, new ipe or teak decking is significantly more expensive than softwood replacement, making professional restoration an even stronger financial argument for hardwood deck owners.
Actual costs confirmed after a site survey covering timber species, moisture condition, weathering extent and access. For the indoor floor sanding rate schedule, see our full wood floor price guide →
Our Recent Work
Our Other Services
Wood Floor Sand & Seal
Varnish Treatment
Floor Finishes and Seal
Stair Stripping and Sanding
Commercial Floor Sanding
Hardwood Floor Sanding
Maintenance and Care
Parquet Floor Sanding
See What Our Happy Clients Have to Say!
Sarah
Maidstone, Kent
★★★★★
"I recently hired Sanding Wood Floors to restore the original floorboards in my Maidstone home, and I couldn't be happier with the results! I highly recommend their services!"
James
Tunbridge Wells, Kent
★★★★★
"As a homeowner in Tunbridge Wells,kent I was amazed by the skill and efficiency of the Sanding Wood Floors team. They brought my worn-out wooden floors back to life, leaving them looking brand new."
Olivia
Ramsgate, Kent
★★★★★
"I'm extremely satisfied with the results. The finished parquet floors are absolutely beautiful and have added so much value to my home. I highly recommend them to anyone in need of wood floor restoration."
Frequently Asked Questions
How often should a wooden deck be sanded and oiled?
Softwood decking (pine, larch): sand every 3–5 years when significant greying or surface damage appears; re-oil every 1–2 years. Hardwood decking (ipe, teak, bangkirai): sand every 5–8 years depending on weathering; re-oil every 1–3 years. Practical test for re-oiling frequency: apply a few drops of water to the deck surface. If the water beads, the oil is still protecting. If it soaks in within 30 seconds, re-oiling is overdue. South-facing and rooftop terraces may need more frequent attention because UV exposure and rainfall accelerate surface weathering. Regular treatment prevents splintering, moisture ingress and premature timber deterioration.
Can you sand a wet deck?
No. Sanding wet timber is ineffective because moisture causes fibres to tear rather than cut cleanly. Wet decking also clogs abrasives quickly and prevents accurate surface preparation. The deck should dry sufficiently before sanding begins and reach acceptable moisture levels before finishing products are applied.
Can you sand a composite deck?
No, composite boards cannot be sanded. Their manufactured surface layer is designed to remain intact, and sanding causes permanent surface damage. Timber elements surrounding composite decking like handrails, fascias, posts, steps, can often be sanded and restored separately. We confirm exactly which elements can be sanded and which require alternative cleaning at the free survey before any work begins.
What is the best oil for a garden deck in London?
For softwood decking (pine, larch, cedar): Osmo Wood Protector (UV-resistant, available tinted) or Barrettine Premier Wood Preservative for cost-effective protection. For hardwood decking (teak, ipe, bangkirai): Osmo UV Protection Oil Extra or Deks Olje D2, specifically formulated for dense hardwoods that resist standard deck oils and require acetone-based pre-cleaning before oiling. The key principle: always match the oil to the timber species. Applying a softwood deck oil to dense hardwood produces a sticky, non-penetrating result. We confirm the correct product and the need for pre-treatment at the survey.
How much does deck sanding cost in London?
Softwood deck sanding and 2 coats of deck oil: from £12/m². Hardwood deck sanding, pre-treatment and 2 coats of hardwood oil: from £18/m². A typical 20m² London garden deck: £240–£360 for softwood; £360–£480 for hardwood. Anti-slip oil additive: +£2–£4/m². For reference, new softwood decking (materials and labour) for the same 20m² area typically costs £1,200–£2,500 — restoration at 10–25% of replacement cost. Free survey confirms exact cost after assessing timber species, weathering, and access.
For customers who need information about indoor floor sealing systems like lacquer, hardwax oil, oil and wax options for indoor floors, see our wood floor sealing service → Outdoor deck treatment products are distinct from indoor floor sealers and must not be interchanged.
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