Window and door prices per square metre: how it's calculated and how to compare

When you ask for a windows and doors quote, sooner or later a figure appears: the price per square metre, written as €/m². It’s the metric the industry works with and the one salespeople use to present offers. But it’s also one of the most misunderstood: the €/m² is a useful tool for comparison, not a price list to apply blindly.

This article isn’t a price list and it won’t tell you “your window costs X”. It’s a methodological guide: how the price of windows and doors per square metre is calculated, what indicative bands exist by type, why a small window costs more per m² than a large one, and — above all — how to use the €/m² to expose an inflated or suspiciously low quote without being misled. A premise that holds for the whole article: every figure you read is an order of magnitude, 2026 market range, never a certain price.

Why the price per square metre is used

Windows and doors come in all sorts of sizes. A bedroom window, a patio door and a roof light aren’t comparable “per unit”: surface area, glazing and workmanship all differ. A common denominator was needed to compare different offers and products, and that denominator is the square metre of window/door.

The €/m² works like this: you take the price of the unit and divide it by its surface area (width × height in metres). The result is a figure that, at least in theory, lets you say “this product costs so much per m², this other one so much, which is better value”. It’s the same reasoning you use with price per kilo at the supermarket: it helps you compare, not tells you what you’ll pay at the till.

The metric is particularly handy when you’re thinking about the whole house, because it gives you a single parameter to apply to the total window and door surface area. If you want to understand how you go from €/m² to a full quote for a home, we’ve covered that separately in how much it costs to replace all the windows and doors in a house.

How the €/m² is calculated (and what should be included)

The calculation itself is trivial:

€/m² = price of the window or door ÷ (width in metres × height in metres)

Worked example: a window measuring 120×140 cm has a surface area of 1.2 × 1.4 = 1.68 m². If that supplied window costs, as an order of magnitude, €740, its price per square metre is 740 ÷ 1.68 ≈ €440/m² (indicative).

Nothing complicated so far. The problem isn’t the division, it’s understanding what’s included in that price before you divide it. Two apparently identical €/m² figures can hide very different content. The typical configurations that change the scope of the calculation are:

Item	Included in the €/m²?	Why it matters
Profile + glazing + hardware + seals	Always (it’s the window itself)	It’s the minimum base of the product
Qualified UNI 11673 installation	Sometimes yes, sometimes no	”Supplied” and “fully installed” are different figures
Disposal of old windows and doors	Often excluded	A real cost that needs clarifying
Sub-frames, sills, shutter boxes	Almost always separate	Can weigh heavily on the total
VAT	Often shown separately	Changes the final figure

The golden rule: a €/m² figure only makes sense if you know what it refers to. The “supplied” value (window only) and the “fully installed” value (with installation, disposal and accessories) are two different numbers and shouldn’t be compared to each other. Comparing the supplied €/m² of one company with the installed €/m² of another is the most common mistake — and the one most exploited by anyone trying to look cheap.

Indicative €/m² bands by type

Below you’ll find 2026 market ranges, given as an example, for a standard residential window (tilt-and-turn, average dimensions), referring to the product fully installed where indicated. These are orders of magnitude, not quotes: they give you the “ruler” to read an offer with, not to calculate your own spend.

Material and band	Indicative €/m² (installed)	Typical configuration
PVC entry-standard	€350-450/m²	Basic profile, double glazing, low-E, argon-filled
PVC mid-range	€450-600/m²	Multi-chamber profile, double low-E warm edge
PVC premium	€600-800/m²	High-performance profile, triple glazing
PVC high-performance	€800-1,100/m²	Passive-house-grade profile, triple glazing
Aluminium thermal-break entry	€500-700/m²	Double glazing
Aluminium mid-range	€700-900/m²	Double or triple glazing
Aluminium premium	€900-1,200/m²	Triple glazing
Aluminium high-performance	€1,200-1,500/m²	Triple glazing, argon/krypton

All figures are 2026 market ranges, orders of magnitude, VAT excluded. The low end of the range corresponds to basic products made correctly; the high end to full configurations. PVC typically starts lower than aluminium for equivalent thermal performance, but the real comparison depends on many factors: we’ve developed that in PVC versus aluminium compared, and in the range pages for PVC windows and doors and aluminium windows and doors.

What moves the €/m² within the same type, in indicative order of impact:

• Double vs triple glazing: triple raises the €/m² by roughly +15-30% (indicative) and also affects the hardware more.
• Profile: moving from a basic profile to a high-performance one can add +30-50% (indicative) to the window alone.
• Colour / wood effect: an indicative premium of +8-25% over white.
• Hardware and security: from standard tilt-and-turn to anti-intrusion levels, variable but real impact.

Why small windows cost more per m²

This is the point that confuses the most people, and it’s the most important methodological limitation of the €/m². A small window costs more per square metre than a large one. It’s not a sales error: it’s maths.

The reason is that part of the cost of a window or door is fixed, meaning it doesn’t depend on the surface area. The hardware (hinges, espagnolette, locking points), the labour hours to assemble the frame, cutting the corners, the marking: these items cost roughly the same whether the window is small or large. When you divide a fixed cost by a few square metres, the €/m² shoots up; when you divide it by many, it’s diluted.

A numerical example makes this clear (figures given as an example, orders of magnitude):

Window	Surface area	Indicative price (supplied)	Resulting €/m²
60×80 cm (1 sash)	0.48 m²	~€260	~€540/m²
100×120 cm (2 sashes)	1.20 m²	~€450	~€375/m²
140×210 cm (patio door)	2.94 m²	~€880	~€300/m²

Look at the right-hand column: same type of product, but the €/m² falls as the window gets bigger. The small window isn’t “more expensive” in absolute terms — it costs less in euros — but its square metre is more expensive because the fixed costs are spread over less surface area.

Practical consequence: you can’t apply an average €/m² to every window in the house. If you have many small windows (bathrooms, box rooms, small fanlights), the real average €/m² will be higher than for a house with few, large windows. A serious quote takes this into account; a single €/m² applied blindly overstates the large ones and understates the small ones.

How to use the €/m² to compare quotes without being misled

The €/m² is an excellent comparison tool provided you use it properly. Here’s the honest method, in a few steps.

1. Check that the scope is the same. Before comparing two €/m² figures, make sure both include the same items: supplied vs installed, installation included or not, disposal, accessories. If one offer is “supplied” and the other “fully installed”, the numbers aren’t comparable. Bring them to the same scope before looking at them.

2. Ask for the €/m² by type, not a single figure. Given how much fixed costs weigh on small windows, a good quote distinguishes between bands. If you’re given a single number “valid for everything”, ask how it was calculated.

3. Use the €/m² as a warning sign, not a verdict. If an offer is well below the market minimums for its category, something has been cut: non-low-E glass, basic hardware, a profile with no clear marking, minimal installation. If it’s well above with no reason (triple glazing, security, premium aluminium), there’s an inflated margin. The €/m² tells you where to look, then it’s up to you to ask for the detail.

4. Always look at the content, not just the number. The lowest €/m² doesn’t automatically win. What matters is what’s inside: brand and model of the profile, glazing composition, hardware brand, declared Uw value, installation to standard. We have a dedicated guide on which items to insist on in writing: what to check in a windows and doors quote.

The regulatory references that separate a serious product from an impulse purchase are always the same: CE marking under EN 14351-1 (mandatory for windows and doors), qualified installation to UNI 11673, and the framework of CPR 305/2011 on construction products. A low €/m² obtained by skipping these requirements isn’t a bargain, it’s a risk.

The limits of the €/m²: what it doesn’t tell you

In fairness, it’s worth saying where the €/m² doesn’t help:

• It doesn’t measure quality. A high €/m² doesn’t guarantee a good product, and a low one doesn’t rule it out either. It measures price, not value.
• It doesn’t account for poor installation. An excellent window installed badly loses performance: the product’s €/m² stays high, but the result is poor.
• It distorts at extreme sizes. Very small windows or special units (lift-and-slide doors, bay windows, unusual shapes) have an unrepresentative €/m², dominated by specific workmanship and accessories.
• It doesn’t replace a survey. Opening size, existing sub-frame, sills, accessibility: variables a catalogue €/m² doesn’t see and that change the real price.

In other words, the €/m² is a compass, not a map. It gives you your bearings, but the real quote is built on your window. For a single window, where “per-unit” reasoning is more natural than €/m², we have a dedicated deep dive in how much a PVC window costs.

When it’s NOT worth thinking in terms of price per square metre

The €/m² is useful, but in some cases it’s the wrong tool and risks leading you astray.

• When you have few windows, all small. With small-surface-area windows the €/m² spikes because of fixed costs and makes the offer look “expensive” when in absolute euros it isn’t. In these cases think per unit, not per m².
• When you’re comparing different types. Comparing the €/m² of a standard window with that of a lift-and-slide door or a bespoke unit makes no sense: they’re products with incomparable workmanship and accessories.
• When the lowest €/m² offer is hiding cuts. If you cling to the lowest €/m² without looking at the content, you risk choosing a product with compromised glazing or hardware. The low number attracts you, but you pay dearly for it over the product’s lifetime.
• When the quote is “all-inclusive” with no detail. A single €/m² figure that bundles installation, accessories and special items together with no breakdown is impossible to verify. Insist on the detail: only then does the €/m² become genuinely comparable.

In all these situations, the advice is the same: use the €/m² to get your bearings, but decide on content and the detailed quote, not on the single number.

FAQ

What exactly is the price of windows and doors per square metre? It’s the price of the window or door divided by its surface area in square metres (width × height). It works as a common denominator for comparing products and offers of different sizes. It’s a comparison metric, not a price list: the real price depends on the configuration and is worked out on the individual unit.

How much do windows and doors cost per square metre in 2026? As an indicative order of magnitude, for fully installed PVC you’re looking at roughly €350-450/m² for entry-standard up to €800-1,100/m² for high-performance; for thermal-break aluminium from roughly €500-700/m² to €1,200-1,500/m². These are 2026 market ranges, given as an example, VAT excluded, not guaranteed prices.

Why does a small window cost more per m² than a large one? Because part of the cost (hardware, workmanship, marking) is fixed and doesn’t depend on the surface area. Dividing a fixed cost by a few square metres pushes the €/m² up; dividing it by many brings it down. That’s why you can’t apply a single average €/m² to every window in the house.

Does the price per m² include installation? It depends. There’s a “supplied” €/m² (window only) and a “fully installed” €/m² (with UNI 11673 installation, disposal, accessories). These are two different numbers and shouldn’t be compared to each other. Before comparing two offers, always check that the scope is the same.

Can I compare two quotes just by looking at the €/m²? No, that’s not enough. The €/m² tells you where to look, but the decision is made on content: profile, glazing, hardware, Uw value, installation to standard. A low €/m² achieved by cutting these elements isn’t a bargain. Check for CE marking under EN 14351-1 and UNI 11673 installation.

Is it worth choosing the offer with the lowest €/m²? Not automatically. The lowest €/m² can hide non-low-E glass, basic hardware or minimal installation. Use the €/m² as a warning sign: below the category’s market minimums, something has been sacrificed. Decide on content, not on the number alone.

In summary

The price of windows and doors per square metre is a valuable comparison tool, but only if you use it methodically: the same scope across offers, attention to the fixed costs that push the €/m² up on small windows, and always an eye on the product’s content, not just the number. It’s a compass, not a price list — and it certainly doesn’t replace a quote built on your own windows.

Want a real number instead of a range? Send us the measurements and configuration of your windows and we’ll build you a detailed, itemised quote, with certified CE German Salamander profiles and fully Italian-run management: request a quote.