"How much per window?" is every client's first question — and the most misleading one, because two quotes with the same bottom line can hide completely different products. This guide transparently explains the 6 factors that determine cost, and how to read a quotation like a professional.
The 6 factors that determine price
1. Profile series
The biggest differentiator. A cold series (no thermal break) costs less but is ineligible for subsidies and leaks energy. Thermal-break series scale with polyamide width, sealing levels and certifications — from the mid-range SMARTIA to the flagship SUPREME systems.
2. Glazing
Double low-e glazing with argon is today's standard. Triple glazing, laminated acoustic interlayers or security glass add 15–35% per unit — but for specific cases (noise, ground floors) they're worth every euro.
3. Opening typology
Lift-and-slide overlapping units are the most economical; tilt-and-turn carries a pricier mechanism; pocket (concealed) sliders and oversized minimal-frame units are premium builds. Special shapes and oversizes are costed separately.
4. Colour & coating
Standard RAL colours carry the base price. Special finishes, wood-effect coatings and — essential near the coast — Seaside Class treatment add a small but critical percentage.
5. Hardware & accessories
Multi-point locking, concealed hinges, key-lockable handles: small price differences, large differences in security and lifespan.
6. Removal & installation
Correct installation (levelling, low-expansion foam, sealing tapes, silicone finishing) is 50% of the final result. "Cheap" quotes usually cut corners here — and you pay for it in draughts and damp for 20 years.
Key Takeaway
A quote that is 30% cheaper than the average is not a "bargain", but usually hides compromises in glazing quality, coating, or sealing.
Indicative cost range
Nationally, full window replacement on a typical home ranges indicatively between €4,000–7,500, depending on opening area, series and glazing. Under Exoikonomo 2026, expected with subsidies of up to 80%, the net cost can fall to a fraction of that.
How to compare two quotes properly — checklist
A serious quotation explicitly states:
- Profile series and system manufacturer (e.g. Alumil SMARTIA M11500)
- Thermal-break polyamide width
- Full glazing description (panes, low-e, argon)
- Uw value per window
- Hardware type and number of locking points
- Coating category (and Seaside Class if you're near the sea)
- Works included: removal, installation, sealing, debris disposal
- Warranty on both product AND workmanship
If any of these are missing, you're not comparing prices — you're comparing unknowns.
