Aller au contenu
The energy one stop shop — active across Belgium
067 21 04 02 · Lun–Ven 8h–18h
Wendows Building & Energy Solutions
067 21 04 02 Free quote
Windows · Aluminium

Aluminium windows: slim lines on an everyday opening

You don’t need an oversized bay to enjoy aluminium. On a standard window — tilt-and-turn, side-hung or fixed — it delivers the slimmest frames, so more light, in every RAL shade. With a thermal break, it insulates to the level of a high-performance renovation.

My aluminium window quote → Voir les prix indicatifs
Uf 1.4–1.8
with a thermal break
3 opening types
tilt-turn, side-hung, fixed
50 years +
service life
Aluminium windows: slim lines on an everyday opening
Narrow framesmore daylight
Any RALmatt, satin, two-tone
Technical specifications

What an aluminium window is worth in a standard size

The figures that matter when choosing aluminium for an everyday-sized window, not a large bay. Concrete benchmarks, set by our teams.

  • Thermal insulation
    Uf 1.4–1.8 W/m²K

    On a small frame, the thermal break matters even more: the frame-to-glass ratio works against you. A quality insulating strip, paired with double or triple glazing, brings the window up to the level of a high-performance renovation.

  • Profile slimness
    The slimmest

    On a standard window, narrow frames show instantly: the room gains light and daylight. Aluminium offers the slimmest sections, where PVC has to bulk up to stay rigid.

  • Opening types
    3 formats

    Tilt-and-turn to ventilate safely, side-hung to open wide, or fixed for a simple source of light. All come in aluminium, even in small dimensions.

  • Durability
    50 years +

    Aluminium does not rust, warp or fear UV. Powder coating protects the colour for decades — a window that ages without budging.

  • Aesthetics
    Unlimited RAL

    The full RAL range in matt, satin or textured finish, and even two-tone: one shade street-side, another inside. A contemporary look on the smallest window.

  • Maintenance
    Next to none

    No paint or treatment to redo. A wash with soapy water once or twice a year keeps the original look, year after year.

* Indicative values for a standard-range thermally broken window. Exact performance depends on the model, glazing and dimensions — confirmed at the survey.

In full transparency

Pros & limits of an aluminium window

On an everyday-sized opening, aluminium isn’t always the obvious pick. Here, honestly, is where it earns its premium and where PVC stays the smarter call.

Where it excels

  • The slimmest framesMore daylight and light, even on a small window.
  • Contemporary lookClean lines and RAL shades that lift a renovated facade.
  • Exceptional durabilityImmune to rust, UV and warping, over several decades.
  • Every colour possibleFull RAL range, matt or textured finishes, and two-tone.

What to keep in mind

  • Clear premium over PVCOften 30 to 40% pricier than a PVC window at comparable performance.
  • Less payback in small sizesThe large-bay advantage doesn’t apply here: the extra cost is mainly justified by looks.
  • Insulation hinges on the thermal breakWithout a quality insulating strip, aluminium insulates poorly on a small frame: the range matters.
  • Dark shades sensitive to sunAnthracite and black heat up: we adapt the coating on full-south exposures.
For which project

Is an aluminium window right for you?

It comes into its own whenever you want slimness and a bold style on classic openings. A few cases where it makes full sense:

  • Contemporary facade

    Contemporary facade

    For crisp-styled windows and RAL shades that modernise a facade, aluminium gives the most refined look, standard sizes included.

  • Maximise the light

    Maximise the light

    On a tall or wide window, aluminium’s slim frames claw back daylight that PVC loses as it thickens. Extra light, guaranteed.

  • Consistency with an aluminium bay

    Consistency with an aluminium bay

    If you’re also fitting an aluminium slider, putting your windows in the same material and shade keeps the facade uniform.

Set budget, or the warmth of wood?

For the best insulation/price ratio on a standard opening, the PVC window stays unbeatable. And for a warm feel inside, take a look at the wood window.

AFTER photo — anthracite aluminium windows, slim frames
BEFORE photo — old yellowed white PVC windows
Avant Après
Glissez la poignée pour comparer
Real case · facade renovation, Wavre

Six standard windows switched to anthracite aluminium

The client wanted to modernise the facade without touching the bay dimensions. We replaced six tilt-and-turn windows with thermally broken anthracite aluminium and double glazing: noticeably slimmer frames, more light and a Uw value meeting the grant requirements.

  • 6standard windows
  • Uw 1.1with double glazing
  • −20%frame width
Customer reviews

They chose Wendows

5.0/5 · 7verified reviews

« Nous avons fait appel à la société Wendows pour le remplacement de nos châssis. La différence par rapport aux autres sociétés c'est qu'ils ont pris le temps de faire une étude complète et de nous proposer les châssis qui correspondaient à notre maison et notre besoin. Leur but n'était pas de mettre un châssis et de clôturer un chantier pour en faire un autre. Nous avons été accompagnés dans tout le processus. Du devis, en passant par la prise de mesure et l'attente de livraison. Délais respectés. Je ne peux que recommander cette société. Rapport qualité prix professionnalisme +5⭐️ »
Pierre Jérôme
« Nous avons fait appel à la société Wendows pour le renouvellement de nos châssis et nous sommes vraiment ravis du résultat ! Les travaux ont été réalisés dans les délais annoncés et la finition est impeccable. De plus, M. Aprile qui s'est occupé du devis, s'est toujours montré disponible pour répondre à toutes nos questions. Nous vous recommandons donc de faire appel à eux pour vos travaux ! »
Annick Hauteceur
« Excellente expérience avec Wendows ! Les nouveaux châssis ont transformé notre immeuble et réduit nos factures d'énergie. L'équipe est professionnelle, rapide et à l'écoute. Je recommande vivement leurs services pour toute optimisation énergétique. »
Miguel Cruz
See all reviews
Compare the options

Aluminium, PVC or wood window?

On an everyday-sized opening, aluminium wins on slimness and style, PVC on price, wood on warmth. Compare point by point, then open the material that speaks to you.

Critère Aluminium windowVous êtes ici PVC windowVoir la gamme → Wood windowVoir la gamme →
Indicative price €€€ — higher The gentlest €€€ — premium
Profile slimness The slimmest Standard, thicker Intermediate
Thermal insulation Very good (thermal break) Excellent, natural Excellent
Aesthetics / look Contemporary, clean Understated, 40+ shades Natural warmth
Maintenance Next to none Next to none Stain to be redone
Durability 50 years + 30 to 40 years Good if maintained
Best for Design style, crisp facade Renovation, set budget Charm, old buildings
Indicative benchmarks for standard-range windows. The right choice depends on each opening — we fine-tune it together at the survey.
Indicative price 2026

How much does an aluminium window cost?

The price depends on dimensions, opening type, glazing and finish. In a standard size, aluminium is paid for mainly for its looks. Here are benchmarks for a fitted aluminium window.

See the detailed aluminium price grid →

* Indicative ranges per fitted aluminium window, excluding specific configurations. Itemised estimate provided with your free quote.

  • Tilt-and-turn window
    from €650
    standard size, double glazing
  • Side-hung window
    from €720
    two sashes, fitted
  • Renovation grant
    up to 35%
    of the amount, based on your income
  • Reduced VAT
    6%
    in renovation (home > 10 years)
Aluminium window FAQ

Your questions about aluminium windows

Is aluminium worth it on a standard window? +

It depends on your priorities. On an everyday-sized opening, aluminium’s “large bay” advantage doesn’t apply: the extra cost over PVC is mainly justified by slimmer frames and a contemporary look. If looks matter as much as performance, then yes; if budget comes first, PVC stays the smarter call.

Does a small aluminium window insulate well? +

Provided it has a quality thermal break. On a small frame the frame-to-glass ratio works against you, so the insulating strip matters even more. A serious aluminium range paired with good glazing reaches excellent results, in line with grant requirements.

How much slimmer is it than PVC? +

Aluminium is far more rigid: its frames can stay narrow where PVC has to thicken to hold up. On a standard window, that means slimmer edges, more daylight and more light in the room.

Which opening types are possible? +

All the classic formats: tilt-and-turn to ventilate safely, side-hung to open wide, and fixed for a simple source of light. Each comes in aluminium, even in small dimensions.

Which colours for my aluminium window? +

The full RAL range, in matt, satin or textured finish, and even two-tone (one shade street-side, another inside). Anthracite and black are the most requested for their contemporary look on a facade.

Which grants for an aluminium window? +

Grants depend on the performance achieved (Uw value), not the material. A high-performance aluminium window qualifies, depending on your region and income, for a renovation grant and 6% VAT for homes over ten years old. We guide you step by step through the grant application.

Get your free aluminium window quote within 48h

Free on-site survey, grants calculated, a single point of contact. Describe your project in under a minute.

  • Free and no obligation
  • Grants & 6% VAT explained for you
  • Fitting by our certified installers
Request my aluminium quote → 067 21 04 02