Staining

Staining near you

Staining is what you buy when you want the timber to still look like timber. Instead of an opaque film sitting on top of the wood, a stain colours it and, in most cases, leaves the grain visible. In British homes the usual candidates are garden decking, fences and gates, garden buildings, exterior joinery, front doors, cladding, staircases and handrails, and interior floors and furniture.

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The choice that matters is not the colour, it is whether the product forms a film or soaks in. A film-forming woodstain or varnish builds a coating that eventually fails at the edges and needs sanding back before recoating. A penetrating stain or oil sits in the timber, wears away rather than peeling, and is recoated by cleaning and applying more. On a British deck, which spends months wet and then bakes for a fortnight, that difference decides how the next five years go.

There is a genuinely checkable legal dimension too, and it is more interesting here than on ordinary paint. Woodstains have their own sub-categories in the VOC regulations, with the highest solvent allowance in the whole of the paints schedule sitting on one of them. And oil-based finishes carry a fire risk that surprises people every year: the rag, not the tin, is the dangerous object.

Stains, oils and varnishes, and which timber wants which

Penetrating stains soak into the timber, colour it without building a film, and weather by fading rather than by flaking, which makes recoating simple.
Opaque woodstains are pigmented heavily enough to hide the grain while still being classed as woodstains, and they suit fences, sheds and previously stained joinery.
Decking oils condition the boards and slow water movement in and out, which is what reduces the cupping and splitting that ruins a British deck.
Exterior varnishes build a clear, glossy film that looks superb on a front door and is the least forgiving finish there is once sunlight starts to break it down.
Interior floor stains are followed by a separate hardwearing sealer, since the stain itself provides colour and no protection at all.
Hardwax oils on interior timber give a low-sheen, repairable surface that is patched rather than resanded when it wears in a doorway.
Preservative treatments are a different product with a different job: they target rot and insect attack rather than appearance, and are often applied under a decorative finish.

Reading a woodstain tin: the sub-categories with the loosest limits

Schedule 1 to the Volatile Organic Compounds in Paints, Varnishes and Vehicle Refinishing Products Regulations 2012 gives woodstains two separate homes. Interior and exterior trim varnishes and woodstains are defined as coatings for application to trim which produce a transparent or semi-transparent film, and the definition expressly takes in opaque woodstains. Minimal build woodstains are defined separately as woodstains with a mean thickness of less than 5 micrometres when tested according to EN 927-1:1996 - a dimension, not a marketing claim, and a useful thing to know exists.

Schedule 2 then sets what each may contain, and the split is startling. Interior and exterior trim varnishes and woodstains are limited to 130 grams of VOC per litre water-borne and 400 solvent-borne. Minimal build woodstains are limited to 130 water-borne but 700 solvent-borne, one of the two highest allowances in the whole paints and varnishes table, beaten only by binding primers at 750 and far above the 30 grams per litre permitted for matt interior wall coatings. The thin, deeply penetrating product that seems gentle because it barely coats the wood is, chemically, among the most solvent-heavy things on the shelf.

None of that makes solvent-borne stains wrong outdoors, where they often perform better and where the solvent evaporates into the open air. It does make the sub-category worth reading before anyone brings the same product indoors onto a staircase, a floor or a run of internal joinery in a house that cannot be aired properly. The label must state the sub-category and the figures, so the comparison takes seconds in the shop.

Preparation, and why stain is less forgiving than paint

The timber has to be genuinely dry, because stain applied onto damp wood will not penetrate evenly and traps moisture behind whatever film does form.
Old failing film has to come off rather than be recoated, since a new coat over a peeling varnish peels on the same schedule as the old one.
Greying, weathered surface fibres on exterior timber need removing with a cleaner or brightener, or the new colour keys into a layer that is already letting go.
Sanding has to be even and consistent in grit, because stain shows sanding marks and differences in absorbency that paint would hide entirely.
End grain drinks far more than face grain, so cut ends of decking boards, fence rails and joinery need extra attention and often a second application.
Test on an offcut or a hidden area first, since the same tin gives very different results on oak, redwood, pressure-treated softwood and old weathered board.
Fixings, hinges, glass and masonry below the work should be masked, because a penetrating stain that reaches brick or stone does not wash off.

The rag is the hazard: oily cloths and spontaneous combustion

This is the part of staining that causes real fires in British houses and sheds, and it has nothing to do with the tin being flammable. Northamptonshire Fire and Rescue Service explains it plainly: when linseed oil is exposed to air and comes into contact with oxygen, a chemical reaction can be caused which creates heat, an exothermic reaction. A cloth soaked in the oil holds that reaction in a small insulated bundle. If the heat cannot escape as fast as it is being produced, the temperature climbs until the cloth ignites on its own, with no flame, spark or cigarette anywhere near it.

The fire service's advice is specific and easy to follow. Do not store oil-soaked cloths inside a building. Hang them on a clothesline where air movement can carry the heat away, or soak the cloth in water and seal it in a plastic bag before putting it in the bin, or keep it in an airtight and preferably metal container. The same warning applies to other oils and is worse anywhere near a radiator or a heated surface. A pile of applicators left in a corner of the garage at the end of a decking job is exactly the situation the advice is written for, so ask any contractor what they intend to do with theirs before they leave.

Keeping a stained surface alive between full recoats

Inspect exterior timber at the end of winter rather than in high summer, because that is when the damage from months of wet is visible.
Wash decking and cladding before assuming they need recoating; a great deal of what looks like a tired finish is algae and dirt.
Recoat penetrating stains and oils before the surface starts to grey, since once the fibres have weathered the preparation gets much longer.
Treat cut ends, joints and the undersides of rails as the early-warning areas, because water sits in them longest.
Keep planters, mats and stored furniture off decking for long stretches, as a covered patch stays wet and weathers differently from the rest.
Watch south and west-facing joinery, where British sunlight does most of the work of breaking down a clear film.
Note the product name, the colour and the date somewhere you will find them again, because matching a stain later without that information is guesswork.

What goes wrong with stained timber

Blotchy, uneven colour, which usually means the timber was sanded inconsistently or was not equally dry across the surface.
A clear varnish flaking off a sunny door or window while the sheltered side still looks fine, which is ultraviolet breakdown rather than a bad product.
Black spotting and staining on oak and cedar where iron fixings or fittings have reacted with the tannin in the wood.
Mould and algae growing on a stained north-facing fence or deck, which is a shade and moisture problem rather than a failure of the stain.
A stain refusing to take at all on new pressure-treated timber that is still too wet from treatment to absorb anything.
Cupping and splitting of decking boards, which is moisture moving in and out of the timber and is slowed rather than stopped by any finish.
A previously varnished surface that has been oiled over, or an oiled surface varnished over, neither of which bonds and both of which have to come off.

British weather windows for exterior staining

Timber needs a genuinely dry run of days before staining, not just a dry morning, because surface dryness hides moisture a few millimetres down.
Most products specify a minimum application temperature that an early spring or late autumn day in Britain will not reach, particularly in shade.
Late spring and early summer generally give the best combination of dry timber, mild temperatures and long daylight for two coats.
Direct hot sun is its own problem, since a stain that dries before it penetrates gives patchy colour and poor performance.
Autumn work risks overnight dew landing on a finish that has not cured, which leaves a dull bloom that has to be sanded off.
Winter is for planning and preparation rather than application, other than interior work in a heated and ventilated room.
Fences and sheds can often be done earlier in the year than decking, because they shed water and dry out far faster than a horizontal surface.

What drives a staining quote, and how LokalMatch fits in

Preparation and the state of the existing finish are what move the figure. Bare or previously oiled timber that only needs cleaning is a different job from a deck or a door carrying a failed film that has to be stripped or sanded back first. After that it is the surface area including all the awkward faces - spindles, balusters, fence rails, the undersides of decking boards - the number of coats the product and the timber need, whether the work is at height or over a conservatory or a flower bed, whether furniture and planters have to be moved and stored, how much masking is needed to protect masonry and glass below, and whether any boards, rails or sections of joinery are rotten enough to want replacing before anything is applied.

LokalMatch exists to make that conversation happen once rather than five times. Describe the timber, its condition and roughly how much of it there is, give your postcode, and decorators and timber-care specialists working in your area will contact you. It is free for the person asking; the trades pay for the enquiries that reach them. LokalMatch does not apply any finish, does not set prices and does not vet, rank or recommend the people who get in touch, so checking what preparation each quote includes is the part that pays you back.

Staining: frequently asked questions

What is the difference between a stain and a paint?

Paint builds an opaque film that hides the timber; a stain colours the wood and usually leaves the grain visible. The more useful distinction is whether the product forms a film or penetrates. Film-forming woodstains and varnishes eventually fail at the edges and need sanding back before recoating, while penetrating stains and oils wear away gradually and are recoated after cleaning. On horizontal British timber such as decking, the penetrating route is generally much less work over a decade.

Why does the thin, watery-looking woodstain smell so strong?

Because it is allowed to be one of the most solvent-heavy products in the paints schedule. Schedule 1 to the 2012 VOC regulations defines minimal build woodstains as those with a mean thickness under 5 micrometres tested to EN 927-1:1996, and Schedule 2 allows them 130 grams of VOC per litre water-borne but 700 solvent-borne - beaten in that table only by binding primers at 750. By comparison, trim varnishes and woodstains are capped at 400 solvent-borne and interior matt wall coatings at 30. The label has to state the sub-category and the figures, so you can check before buying.

Can I stain new pressure-treated decking straight away?

Usually not. Freshly treated timber often arrives still wet from the treatment process, and a stain applied to it cannot penetrate properly and will look patchy. Let the boards dry out and weather for a period first, test a small hidden area to see whether the surface accepts the product, and only then do the whole deck. Trapping treatment moisture under a film-forming finish is one of the more common ways to ruin a new deck in its first year.

Is it true that oily rags can catch fire on their own?

Yes, and a UK fire service says so directly. Northamptonshire Fire and Rescue Service explains that when linseed oil is exposed to air and meets oxygen, a chemical reaction creates heat - an exothermic reaction - and if that heat cannot escape from a bundled cloth the temperature can rise until it ignites. Their advice is not to store oil-soaked cloths inside a building, to hang them where air can carry the heat away, or to soak them in water and seal them in a bag before disposal, or keep them in an airtight metal container.

How often will my deck need doing again?

It depends on the finish type and the exposure rather than on a calendar. Penetrating oils and stains on a deck that gets full weather generally want attention more often than a sheltered fence, and the honest signal is the surface starting to grey or water no longer beading. Recoating a penetrating finish before it has weathered away is a wash and a coat; leaving it until the fibres have greyed turns the next job into cleaning, brightening and sanding first. Film-forming products last longer between coats but fail harder when they do.

Can I put a new stain over an old varnish?

Not successfully. A stain works by soaking into timber, and an existing varnish film stops it reaching the wood at all, so you get a coloured smear on top of a finish that is already on its way out. The old film has to be removed or sanded back to bare timber first. The same is true in reverse: varnishing over an oiled surface generally fails to bond. Ask any contractor what they intend to do with the existing finish, because that answer is most of the price.

Sources

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

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What affects the cost of staining

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

Size of the area and ceiling height
Condition of the walls, trim or siding
Amount of prep and repairs
Number of colours and coats
Paint quality
Access, including stairwells and upper floors

How to compare painters before you hire

Ask how the painter will prepare the surfaces, since patching, sanding and priming matter as much as the paint.
Get a written quote that lists which rooms or surfaces are included, the number of coats and who supplies the paint.
Ask how they'll protect floors, furniture, landscaping and anything they can't move.
In older homes, ask how they handle old paint that may contain lead.
Look at recent work, paying attention to clean lines at ceilings and trim.

Questions to ask painters before you hire

What prep work is included, such as patching, sanding, caulking and priming?
How many coats are included, and what paint will you use?
Are ceilings, trim, doors and closets part of the price?
How will you protect my floors, furniture and plants?
Can you show me proof of liability insurance?
What happens if I notice touch-ups needed after you finish?

Staining permits and local rules

Some staining work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

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