Aluminium vs Wooden Windows: Which Is Best?

Choosing aluminium vs wooden windows comes down to how much maintenance you want to do, the look you’re after and the total cost over the life of the window. Both are quality choices, but they behave very differently in the South African climate. This guide compares aluminium vs wooden windows fairly — maintenance, durability, insulation, appearance and cost — so you can pick the right frame for your home.

Aluminium vs wooden windows: at a glance

	Aluminium	Wooden (timber)
Maintenance	Wipe clean; no repainting	Sand, seal & repaint every few years
Rot, rust & warp	Won’t rot, rust or warp	Can rot, swell and warp in damp/heat
Lifespan	Very long with little upkeep	Long if well maintained
Frame profile	Slim, strong, large glass area	Chunkier frames, smaller glass area
Look	Modern; woodgrain finish available	Natural warmth, heritage character
Cost over time	Keen upfront, very low upkeep	Higher lifetime cost from maintenance
Best for	Low-maintenance, modern & coastal homes	Heritage & traditional homes

Maintenance: aluminium vs wooden windows

This is the biggest practical difference. Wooden windows need regular care — sanding, sealing and repainting or re-varnishing every few years — to stop them drying out, cracking or rotting. Aluminium windows need almost none: a wipe with soapy water keeps them looking new, and the powder-coated finish won’t peel or need repainting. For most homeowners, that ongoing upkeep is the deciding factor in the aluminium vs wooden windows question.

Durability in the South African climate: aluminium vs wooden windows

South Africa is demanding on window frames — strong sun, big temperature swings, summer storms and, near the coast, salt air. Aluminium won’t rot, rust, swell or warp, and it shrugs off coastal conditions with little more than a clean. Timber is a natural material: without diligent maintenance it can swell in humidity, dry and crack in the sun, and is vulnerable to rot and borer over time. Well-maintained wood lasts a long time, but it asks more of you to get there.

Insulation and sound: aluminium vs wooden windows

Wood is a natural insulator, so a wooden frame has a slight edge on raw thermal performance. Modern aluminium closes the gap with thermally-broken profiles, and either frame can take double glazing or laminated glass for warmth and noise control. In practice, the glass specification matters more than the frame material for insulation, so both can be made comfortable and quiet.

Appearance: aluminium vs wooden windows

This is where personal taste leads. Wooden windows bring natural warmth and suit heritage, cottage and traditional homes. Aluminium gives slim, strong frames that carry larger panes of glass for a light, modern look — and if you love the timber aesthetic without the upkeep, a woodgrain powder-coat finish gives an aluminium window the look of wood with none of the maintenance.

Cost over time: aluminium vs wooden windows

Wooden windows are usually more expensive upfront and carry an ongoing maintenance cost — paint, sealant and labour every few years. Aluminium is keenly priced, especially factory-direct, and its near-zero upkeep means a lower total cost over the life of the window. When you weigh aluminium vs wooden windows on lifetime cost rather than sticker price, aluminium usually comes out ahead.

So which should you choose?

Choose aluminium if you want a low-maintenance, durable, modern window that stands up to the South African climate — it suits most homes, and especially coastal and contemporary ones. Choose wood if the natural, heritage character is essential to your home and you’re happy to maintain it. For a like-for-like modern alternative, also see our aluminium vs uPVC windows comparison.

Security and strength

Strength is another point worth weighing in the aluminium vs wooden windows decision. Aluminium is a naturally rigid metal, so slim frames stay square and support large panes and robust locking without flexing. Timber is strong too, but it can swell, shrink and drop out of square over the seasons, which can leave gaps around the sash. Both materials make secure windows when fitted well and glazed with laminated safety glass, but aluminium holds its shape and hardware alignment with far less attention.

Environment and resale

On sustainability the two are close. Aluminium is fully recyclable and lasts for decades with minimal upkeep, while responsibly sourced timber is renewable but needs ongoing paint and sealant. For resale, buyers increasingly value low-maintenance, modern frames, which tips the aluminium vs wooden windows question toward aluminium in most newer and coastal homes. If your property is a heritage or character home, matching original timber joinery can protect its value instead. In short, the best window is the one that suits your home, your climate and how much upkeep you want to take on.

Aluminium windows from Coetz

Coetz™ supplies quality aluminium windows, including our top-hung range, in charcoal, bronze, white and woodgrain powder-coated finishes, glazed with 6.38mm laminated safety glass to South African glazing practice (see SAGGA). We’re supply-only and factory-direct, so you get keen pricing with nationwide delivery. Use the Shop by Size tool or send your sizes for a quote.

Frequently asked questions

Related: aluminium vs uPVC windows, top-hung aluminium windows, and how to measure for aluminium windows.

Care guide: how to clean aluminium windows — keep the frames looking new and the tracks sliding smoothly.

Misted-up glass? See aluminium window condensation — what causes it and how to reduce it.

Security: see are aluminium windows secure — how strong frames, laminated glass and good locks keep your home safe.