A timber deck takes far more punishment than any floor inside the house. Sun, rain, salt air near the coast, pot plants and barbecue spills all break down the finish, and once the coating goes, the timber turns grey, splits and starts to cup. The good news is that most decks can be brought back with the right preparation and a fresh finish, without replacing boards.
Geelong Floor Sanders is an enquiry service. With your consent, we pass your enquiry to an independent local contractor, once one is appointed, who can look at your deck and quote the work. This page explains what deck sanding and oiling involves, how to tell what your deck needs and what it typically costs, so you can compare quotes with confidence.
Clean and re-oil, or a full sand?
Not every tired deck needs sanding. The right approach depends on what's on the timber now and how far it has weathered.
A clean and re-oil usually suits a deck that was oiled within the last year or two, still has some colour and isn't peeling. The deck is scrubbed with a timber cleaner, rinsed, left to dry and given fresh coats of the same type of finish. It's the cheaper option and a good way to keep a deck in shape.
A full sand and oil is usually needed when:
- The timber has gone silver-grey all over
- An old water-based coating or stain is peeling, flaking or blotchy
- Boards are rough, splintering or have raised grain
- You want to change from a water-based finish to an oil, or the other way around
- You want a noticeably different colour
The grey look isn't just faded oil. Sunlight breaks down the surface fibres of the timber, and mould grows on what's left. Oil applied straight over that layer often turns the deck very dark, almost black, which is why a weathered deck is usually sanded back to fresh timber first.
What deck sanding involves
The steps vary between contractors and decks, but a full job usually looks like this:
- Inspection. Checking for loose, split or rotten boards, rusty or raised fixings, and soft spots in the frame underneath. Sanding won't fix a structural problem.
- Fixings punched down. Nails and screws are set below the surface so they don't tear the sanding belts or leave bright marks.
- Sanding. A drum or belt sander for the main area, then edgers and hand sanding around posts, steps, balustrades and the house wall. Decks are usually sanded to a coarser finish than indoor floors so the oil can soak in.
- Cleaning. A timber cleaner removes dust, mould and tannins and helps the finish penetrate. The deck then needs to dry properly.
- Finishing. Usually two coats of decking oil or a water-based deck finish, with drying time between coats. A third coat is often recommended for decks in full sun or around pools.
Steps, balustrades, handrails, privacy screens and built-in seating are slow, detailed work and are often priced separately from the main deck area.
Oil or water-based finish?
There are two broad families of deck finish, and the choice affects how the deck looks and how you'll maintain it.
| Penetrating oil (solvent-based) | Water-based deck finish | |
|---|---|---|
| How it works | Soaks into the timber | Mostly forms a coating on the surface |
| Look | Rich, natural grain | More even colour, can hide the grain over many coats |
| Drying | Slower, stronger smell | Fast drying, low odour, cleans up with water |
| Wear | Fades gradually, doesn't peel | Lasts longer between coats, but can peel or flake if neglected |
| Maintenance | Clean and recoat, usually without sanding | Needs recoating before it breaks down, or a sand to fix peeling |
Neither is right for every deck. If you're happy to re-oil regularly and like a natural look, a penetrating oil is forgiving. If you'd rather recoat less often and keep up with maintenance, a water-based finish can suit.
One rule matters: don't mix the two. Water-based and oil-based products shouldn't be applied over each other. To switch from one to the other, the deck needs to be stripped back to bare timber first.
Stains and colour
Many decking oils come in tinted versions such as natural, merbau, jarrah or spotted gum tones. A tint adds colour and gives the timber a little more protection from UV light, and darker tones generally hold up better in full sun. Pigmented stains give a stronger, more even colour but hide more of the grain.
Colour always looks different on your own timber than on a sample card. Ask for a test patch on an out-of-the-way board before the whole deck is coated.
New decks and tannins
New hardwood decking, especially merbau, spotted gum and jarrah, contains natural tannins that bleed out when the timber gets wet. Tannin stains can mark paving and render below the deck, and coatings won't take evenly until the tannins are removed. A new deck is usually cleaned with a tannin remover, or left to weather for a few months, before its first coats. Ask your contractor which approach suits your timber.
Geelong decks
Geelong's mix of older homes, newer estates and coastal towns means decks come in all ages and timbers.
- Coastal decks in Ocean Grove, Barwon Heads, Torquay, Jan Juc and Portarlington cop salt air, sand and strong sun, which can wear finishes faster.
- North and west-facing decks anywhere in the region get the most UV and usually need recoating more often than shaded ones.
- Older decks may have soft or rotten boards, rusted nails or a tired frame. These are worth checking before sanding.
- Pool surrounds need a finish suited to wet, barefoot areas, so mention a pool in your enquiry.
Typical deck sanding costs
Published 2026 price guides give these typical ranges. They're mostly Melbourne and national figures, not Geelong-specific, and they aren't a quote.
| Job | Typical range | Source |
|---|---|---|
| Clean and re-oil, no sanding | $25 to $45 per m² | Modernize Solutions |
| Full restoration: wash, sand and oil | $45 to $80 per m² | Modernize Solutions |
| Sanding and oiling | $35 to $75+ per m² | Deck Rejuvenation (Melbourne) |
| Clean, sand and two coats, whole deck | about $600 (under 15 m²) to $3,000 (over 35 m²) | hipages |
Expect extra for steps, balustrades and screens, replacement boards, heavy weathering and difficult access. See our prices page for all typical ranges.
Frequently asked questions
Does my deck need sanding, or just a clean and re-oil?
If the deck still has some colour, isn't peeling and was coated in the last year or two, a clean and re-oil is often enough. If it has gone grey all over, the old coating is peeling or flaking, or the boards are rough, it usually needs a full sand back to fresh timber. A contractor can tell you after a quick look, and photos in your enquiry help.
Should I use an oil or a water-based deck finish?
Penetrating oils soak in, give a natural look and fade rather than peel, but need recoating more often. Water-based finishes dry quickly and last longer between coats, but can peel if neglected. Stick with the type already on the deck unless it's being sanded back to bare timber.
How often does a deck need re-oiling?
It depends on the product and exposure. Oil-based finishes often need a fresh coat every 6 to 12 months, and sometimes sooner in full sun. Water-based finishes typically last around 12 to 24 months. If water soaks in and darkens the timber instead of beading, it's time to recoat.
Can a new deck be oiled straight away?
New hardwood decking usually needs its tannins removed first, either with a tannin remover and cleaner or by letting it weather for a few months. Coating straight over fresh tannins can give a patchy finish. Check the timber and product instructions with your contractor.
How much does deck sanding and oiling cost in Geelong?
Published 2026 guides put a clean and re-oil at about $25 to $45 per square metre, and a full sand and oil at about $35 to $80 per square metre, depending on condition. Steps, balustrades and repairs are extra. These are typical ranges, not a quote.
Get a quote for your deck
Send us your suburb, the rough deck size, the timber if you know it, what's on it now and a few photos. With your consent, we'll pass your enquiry to an independent local contractor once one is appointed. They'll contact you to inspect and quote, and there's no obligation to go ahead. You can also ask about floor sanding or stair sanding inside at the same time.