Treated · Factory finished · Built for UK weather
Weather-Resistant Timber Windows
Wind-driven rain, frost, UV and condensation are what really test a wooden window. Ours are made from engineered pine, engineered meranti or solid oak, vacuum treated, factory finished with microporous coatings and detailed to shed water — so they stay sound for decades. Part of our range of bespoke timber windows.
Vacuum treated timber
Microporous factory finish
Drip-grooved sloped sills
Pine, meranti or solid oak
Double glazed as standard
5-year warranty
Durability
How Durable Are Timber Windows?
A well-made, properly maintained timber window lasts for decades. How long depends on the timber, the treatment, the finish and how exposed the window is — south- and west-facing elevations and coastal sites work a window much harder than a sheltered one.
| Timber | Construction | Typical service life | Best for |
|---|---|---|---|
| Engineered pine | 3-layer engineered softwood | 25–35 years | Sheltered to moderate exposure, painted finishes |
| Engineered Dark Red meranti | 3-layer engineered hardwood | 35–45 years | Exposed, west-facing and coastal elevations |
| Solid European oak | Solid timber throughout | Around 50 years | Maximum durability, natural or stained finishes |
Every window carries a 5-year product warranty. The figures above assume regular care of the finish — the single biggest factor in how long any timber window lasts.
Treatment
How Our Timber Windows Are Treated for Weather Resistance
Engineered lamination. Wood moves: it swells when wet and shrinks when dry, mostly across the grain. In a single solid section that movement is cumulative — joints open, frames rack and sashes stick. Our pine and meranti windows use 3-layer engineered sections, so movement in one layer is restrained by its neighbours and the profile stays stable. Oak, which is naturally dense and stable, is used as solid timber.
Vacuum impregnation. Before machining, the blanks go into a vacuum chamber: air is extracted, then preservative — usually a copper-based formulation — is drawn deep into the grain. Every surface finish is eventually breached by a stone chip or a ladder scratch; with deep impregnation, the wood beneath that breach is already protected. If a supplier just says “pressure treated”, ask what chemical, what retention and what penetration depth.
Microporous factory finish. Conventional gloss paint forms a plastic-like skin: once water gets under a crack it is trapped, and the paint blisters and peels. Microporous coatings bond with the wood fibre and let water vapour escape while shedding liquid water, so the wood can breathe. We apply a four-stage system — preservative base, stain coat, intermediate and topcoat with UV stabilisers — in temperature-controlled, low-humidity spray booths, with proper drying time between coats. When it needs refreshing, you lightly sand and recoat. No stripping.
UK weather
Do Wooden Windows Rot? What UK Weather Does to Timber
Wooden windows rot when water gets in and cannot get out. Well-treated, well-finished frames with good detailing resist it for decades. These are the four things that do the damage:
| Threat | Where it hits | How we protect against it |
|---|---|---|
| UV radiation | South-facing frames — greying and chalking of wood and coating | UV stabilisers in the topcoat; pigmented finishes block UV far better than clear ones |
| Driving rain | Sill tops, bottom rails and sash meeting rails, where water sits | Sloped sills with a drip groove underneath to shed water |
| Frost and thaw | Hairline cracks in rigid paint that freeze and widen | Flexible microporous coatings that move with the wood |
| Condensation | North-facing bedrooms and bathrooms — water runs onto the frame | Sealed joints, intact finish and warm-edge, low-E double glazing |
Condensation is the one people forget: night after night all winter, moisture from breathing and showers runs down cold glass onto the frame. Our double glazed timber windows come with low-E glass and warm-edge spacers as standard, keeping the inner pane warmer and reducing condensation.
Timber choice
Best Timber for Exposed Windows: Pine, Meranti or Oak
Not every window on your house faces the same conditions, so you do not need the same timber everywhere.
Engineered pine is our biggest seller and handles sheltered to moderate exposure perfectly well — under eaves and on protected elevations. It takes paint beautifully, and painted pine looks identical to painted meranti or oak. See softwood windows.
Dark Red meranti is where we steer customers with exposed positions: west-facing elevations in the wetter half of the country, ground-floor frames near splashback, and coastal homes with salt spray. It is denser, naturally oilier and more resistant to moisture than pine, for about 20–30% more. See hardwood windows.
Solid oak is the premium option: dense, rich in naturally antifungal tannins and very stable, from £799+VAT. See oak windows. Many customers mix species — oak or meranti on exposed elevations, pine everywhere else — for the best balance of durability and budget.
Finishes
Which Finish Lasts Longest Outdoors?
| Finish | Typical recoat on sun-exposed elevations | Notes |
|---|---|---|
| Pigmented paint (RAL or Farrow & Ball) | Around 5–8 years | Pigment blocks UV — the most durable choice |
| Clear or transparent stain | Around 2–3 years | Shows the grain but lets more UV through |
| Natural oil (oak or meranti) | Re-oil as it weathers, typically every 3–4 years | Silvers over time — cosmetic, not structural |
Recoat intervals are shorter on south- and west-facing elevations and on the coast, and longer on sheltered ones.
Maintenance
Timber Window Maintenance: How Often and What’s Involved
Timber windows are not maintenance-free — and neither is uPVC, which chalks, discolours and cannot be repaired when a profile cracks. The difference is that timber can always be repaired and refreshed.
Inspect factory-finished frames every couple of years, looking for spots where the finish has worn thin, usually sill tops and bottom rails. A light sand with 240-grit and one coat of a compatible microporous finish (Sikkens, Osmo and Teknos all work well) takes about an hour per window. For the lowest maintenance, choose meranti or oak with a natural oil such as Osmo UV Protection Oil. More in our timber window maintenance guide.
How it works
Ordering Weather-Resistant Timber Windows
1
Measure
Send your sizes and photos, and tell us which way the windows face — our measuring guide shows what we need.
2
Quote in 48h
We recommend timber and finish for each elevation and send a quote within 48 hours. Prices from £449+VAT.
3
Made to order
Confirm with a 50% deposit. Windows are treated, finished and made in about 20 working days.
4
UK delivery
Pay the balance on delivery. Your joiner or builder fits them — we are supply only.
Full price list: timber windows prices. For heat loss and U-values, see energy efficient timber windows.
Our Best-Selling Timber Windows:
Weather-Resistant Timber Windows FAQ
Are timber windows weather resistant?
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Yes, when they are made well. Our windows use engineered pine or meranti, or solid oak, vacuum treated with preservative and factory finished with a four-stage microporous coating, with sloped, drip-grooved sills to shed water.
Do wooden windows rot?
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Only when water gets in and cannot escape. Deep preservative treatment, an intact microporous finish and good detailing protect the timber; most rot starts at sill tops and bottom rails, often from condensation, so keep those finishes in good repair.
How long do timber windows last?
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Typically 25–35 years for engineered pine, 35–45 years for engineered meranti and around 50 years for solid oak, with regular care of the finish.
What is the best timber for exposed or coastal windows?
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Dark Red meranti is our usual recommendation for exposed, west-facing and coastal elevations; solid oak is the premium option. Engineered pine suits sheltered and moderately exposed positions.
How often do timber windows need repainting?
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Pigmented paint finishes typically last around 5–8 years on sun-exposed elevations, clear stains around 2–3 years. Sheltered elevations last longer. Inspect every couple of years and touch up worn spots early.
Are your timber windows double glazed?
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Yes. All our windows are double glazed as standard with low-E glass, argon and warm-edge spacers, which also reduces condensation on the frame. Triple glazing is available.
Do you install the windows?
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No. We are supply only: we manufacture, treat, finish and deliver UK-wide, and your own joiner or builder fits the windows.
Get a Quote for Weather-Resistant Timber Windows
Send your sizes and tell us how exposed each window is — we’ll recommend the right timber and finish and quote within 48 hours.
