Most clients who ask me for wood windows already have a species in their head, and it usually comes from somewhere other than windows - an oak floor, a walnut kitchen, a mahogany front door on the last house. Then they see the finish samples and the question changes from "which wood is best?" to "which wood will look right in this room in ten years?"
That is the right question. On a modern European wood window the species decides the look, the weight and how the frame takes a stain. It decides much less about how long the window lasts than most people expect, because the construction does that work. The species, depths and finishes I actually quote are on the European wood windows page; this post is about choosing between them.
Why the species matters less than it used to
A traditional wood window was cut from solid boards. Knots, grain direction and the natural movement of one piece of timber decided whether a sash stayed straight. That is where the old reputation of "soft pine rots, hardwood lasts" comes from.
European wood windows are made differently. The frame and sash are machined from laminated scantlings - three or four layers of kiln-dried timber, glued with the grain of each layer set against the next, and finger-jointed to remove knots and defects. A laminated pine section is far more stable than a solid pine board of the same size. The timber is then impregnated and finished in the factory with a water-based lacquer system before the glass goes in.
I walk through that construction, profile depth by profile depth, in wood window frames explained. The full sequence from timber to crate is in how European wood windows are made. So the engineering is largely solved before the species enters the picture. What is left is appearance, weight, hardness and how well the wood takes a transparent stain. If the species question comes up because the old windows have failed, the decision on those comes first, in replacing old wood windows.
Pine, meranti, oak, mahogany, larch and spruce compared
Pine is what the European plants build most of, and it is the standard on the window systems I quote. Oak and mahogany are built when a client asks for them, meranti is available but rarely ordered, and larch and spruce come on request. On cost the order is simple: pine is the most affordable, then meranti, then oak, with mahogany at the top. The numbers below are typical published values for each species, not guarantees for a given lot of timber.
| Species | Typical density | Janka hardness | Natural decay resistance (heartwood, EN 350 class, 1 = best) | Look | Best finish | Availability |
|---|---|---|---|---|---|---|
| Pine (Scots) | ~550 kg/m3 (~34 lb/ft3) | ~540 lbf | 3-4 | Pale, warm, visible growth rings | Opaque or transparent | Standard |
| Meranti (dark red) | ~675 kg/m3 (~42 lb/ft3) | ~780 lbf | 2-4, varies by source | Even, fine grain, reddish-brown | Transparent stain | Available, rarely specified |
| Oak (European) | ~710 kg/m3 (~44 lb/ft3) | ~1,120 lbf | 2 | Open, pronounced grain, golden to brown | Transparent stain to show the grain | On client request |
| Mahogany | ~500-650 kg/m3 (~31-41 lb/ft3), varies by species | ~800-1,100 lbf | 2-3, varies by species | Fine, interlocked grain, deep reddish-brown | Transparent stain | Quoted per project |
| Larch (European) | ~590 kg/m3 (~37 lb/ft3) | ~1,100 lbf | 3-4 | Warm reddish tone, distinct grain, resinous | Transparent or opaque | On request |
| Spruce (Norway) | ~450 kg/m3 (~28 lb/ft3) | ~380 lbf | 4 | Pale, quiet grain | Opaque | On request |
Two things jump out of that table. Oak is roughly 30% heavier than pine for the same section, which matters on a tall tilt-and-turn sash or a lift-and-slide panel. And the decay classes are closer than the "softwood vs hardwood" labels suggest - which is why factory impregnation and a sound coating, not the species, carry most of the weather protection. I go through that failure chain in detail in how long do wood windows last.
How each species behaves on a real house
Pine is the default, and not because it is the cheap option. Laminated pine is stable, light, easy on the hinges, and takes both opaque colors and transparent stains well. It is what most of the larger European producers build as their standard, painted or stained, and it is what I would specify almost every time. The grade of pine follows the finish, which is the next section.
Meranti is a tropical hardwood with an even, quiet grain and very low movement once laminated. It is available, but in practice it is ordered rarely - pine covers most of what meranti was used for, so I treat it as a choice for a client who wants that specific reddish, even tone rather than a default. In the US trade you may see it sold as "Philippine mahogany" - it is a different genus from true mahogany, but the reddish tone is similar.
Oak is the statement choice. It is hard, heavy and has the most visible grain of these species, so it is almost always finished with a transparent stain - painting oak hides the reason you paid for it. It suits heavy sashes, lift-and-slide doors and interiors where the windows sit next to oak floors or joinery.
Mahogany is the premium choice: a fine, even grain with a deep reddish-brown tone that darkens with age, at the top of the cost range. It belongs on interiors built around mahogany doors or joinery, under a transparent finish. Mahogany is a trade name for several related hardwoods, so I confirm the exact timber, its weight and its availability in the quote.
Larch has a warm, slightly orange-red tone and a resinous heartwood that is naturally more resistant to decay than pine. I treat it as an on-request species: good when a client asks for it by name, not something I push.
Spruce is pale and very light. It is best under an opaque finish and comes on request for projects with a fully painted color scheme.
Painted or stained: the pine grade changes with the finish
Within pine there is a second choice that matters more for the look than the species debate. Producers typically split it by finish:
- Opaque (painted) colors go on finger-jointed pine. The finger joints and small growth variations disappear under the paint, so there is no reason to pay for a cleaner board. This is where the large majority of the volume sits.
- Transparent stains and glazes go on select pine. The grain stays visible, so the lamellas are chosen for appearance and the blank is built from longer, cleaner pieces. More timber is rejected in selection, and that waste is part of the price. The other cost drivers are laid out in what determines the price of wood windows.
So "pine" on a quote can mean two different things. If the windows will be painted, ask for the finger-jointed build and do not pay for selection you will cover with color. If you want to see the grain, say so up front, because that is a different, more expensive blank.
Mahogany windows: real timber or a stain?
This is the one I get asked about most after oak, and there are two answers. Genuine mahogany timber is something I can quote - it is the most expensive of the species here, so I price it side by side with meranti when a client asks. The finish chart also carries a mahogany stain - a transparent color applied over the timber, usually pine or meranti, that gives the mahogany tone while the grain shows through. The same chart has walnut, golden oak and ebony tones.
If the goal is a mahogany look on a budget, meranti with a mahogany-tone stain gets closest, because its grain is fine and even. If the goal is genuine mahogany, I quote the real timber. US lines list mahogany too - I set one against the European systems in Marvin wood windows vs European wood windows.
Does the species change energy performance?
A little, not enough to drive the decision. Denser timber conducts slightly more heat than lighter timber, so an oak frame is marginally less insulating than a pine frame of the same depth. In practice the frame depth, the number of seals and the glass package matter far more. The systems I quote run from 68 mm (2.68 in) to 92 mm (3.62 in) deep in solid timber, with published whole-window values around Uw 0.77-0.83 W/m2K - roughly U-factor 0.14-0.15 - for the configurations the manufacturer tested. I confirm the value for the actual species and glass on your project in the quote rather than assuming the published figure carries over.
If exterior maintenance is the real worry, the answer is not a different species - it is aluminum on the outside. The aluminum-clad wood windows keep any of these species inside the room and put a powder-coated shell on the weather side.
What I would specify
If the choice is still open between timber, aluminum-clad timber and aluminum, the aluclad vs aluminum vs wood decision table settles that first; the species question below comes after it.
For a painted interior, finger-jointed pine with an opaque factory finish. For a stained interior on a typical custom home, select pine with a transparent stain; I bring meranti in only if the client wants its even reddish tone. For a room built around oak floors or oak joinery, oak with a transparent stain, and I check the weight of the largest sashes before we commit. Mahogany when the interior is designed around it and the budget allows the top of the range. Larch when the client asks for it. On any elevation facing south or west with no overhang, I would put the same species inside an aluminum-clad system rather than rely on the exterior coating. Once the species is settled, the best wood windows buyer's checklist covers what else to hold a quote against.
FAQ
What is the best wood species for windows? There is no single best. Laminated pine is the most versatile and the standard at most producers, oak gives the strongest grain and the most weight, and meranti is a niche choice for an even reddish tone. The construction and the factory finish decide durability more than the species does.
Are hardwood windows better than pine windows? Not automatically. Oak and meranti are harder and denser, which helps with dents and gives a richer stained look. Laminated, impregnated and factory-finished pine performs very well on a house, is lighter on hinges and takes paint better.
Can I get mahogany windows from Europe? Yes. I can quote genuine mahogany timber; it sits at the top of the cost range, above oak. If you only need the look, a mahogany-tone transparent stain over meranti is the closest and more affordable match.
Which wood species is the cheapest for windows? Pine. The order from most affordable upward is pine, meranti, oak and mahogany. Larch and spruce are quoted per project.
Can the inside and outside be different colors? On aluminum-clad wood, yes - the exterior is a separate powder-coated shell, so the two sides are fully independent. On solid wood it depends on the system and the finish, so I confirm it per project in the quote.
Is solid wood the same as laminated wood? Both are real wood all the way through. Laminated means the section is glued from several layers of timber, which makes it straighter and more stable than one solid board. It is not a veneer over a core.
Next step
If you have drawings, send them through request a quote and tell me which rooms matter most and what the floors and trim are made of. I will come back with a species and finish for each part of the house. If you are still collecting ideas, the Studio lets you browse reference options first.