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BS METALBS METALAluminium • Steel
Windows & doors

Replacing windows: what to check before you ask for a quotation

A meaningful comparison is not made on the profile series and the final price alone.

A quotation is worth something when it describes clearly what is actually being fabricated and installed. We compare like with like: configurations, glazing units, hardware, roller shutters, insect screens, colour and the method of installation.

A quotation becomes comparable when it is broken down per opening: system series and typology, clear dimensions and opening direction, glazing composition with thicknesses, cavity, Low-E, fill gas and spacer type, a declared Uw per typology rather than one figure for the whole order, paint or anodising with its class, hardware with its manufacturer, and screens, rollers and shutters listed separately. Two quotations that do not agree usually differ not in price but in what they describe.

What should be visible

  • system series and configuration,
  • dimensions and opening type,
  • glazing build-up,
  • powder coating or anodising,
  • hardware and components,
  • removal of the old unit, fixing, sealing and final adjustment.

A window performs as a whole. A good profile on its own is not enough.

What has to be shown per opening

  • system series and type (hinged, tilt-and-turn, sliding, lift-and-slide),
  • clear dimensions and the direction of opening,
  • glazing build-up with thicknesses, cavity, Low-E, fill gas and spacer type,
  • declared Uw per type — not one value for the whole order,
  • coating or anodising, with its class,
  • hardware and fittings, with the maker,
  • insect screens, rollers and shutters listed separately,
  • installation, joint sealing, removal and disposal of the old units.

Why two quotations do not compare

Usually not because one is “more expensive”, but because they do not describe the same thing: a different series, different glass, a different coating class, a different scope of work. Once both are broken down per opening with the items above, the comparison makes itself.

Have a specific project? Get in touch.