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uPVC vs Aluminium Windows: Which Is Better?

uPVC windows are cheaper and insulate well, making them the most popular choice for Irish homes. Aluminium costs more but lasts longer, allows slimmer frames and larger glass, and suits modern homes and extensions.

  • Cost
  • Lifespan
  • Looks and frame size
  • Which homes suit each
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Side-by-side comparison

uPVCAluminium
Typical semi (about 10 windows)€6,000–€12,000€10,000–€18,000
Lifespan25–35 years40+ years
FramesThickerSlimmer, more glass
InsulationVery goodVery good with thermal breaks
MaintenanceLowVery low
Best forMost homes and budgetsModern homes, extensions, large openings

Choose uPVC if

  • Budget matters most
  • You want good insulation at a lower price
  • You're replacing windows throughout a typical house

Choose aluminium if

  • You want slim frames and large glass areas
  • You're building an extension with sliding or folding doors
  • You want the longest lifespan

Both can qualify for the SEAI windows grant.

Frequently asked questions

Are aluminium windows worth the extra cost?

For modern designs, large openings and longevity, often yes. For a typical full-house replacement, uPVC is usually better value.

Which insulates better?

Both insulate well when the aluminium frames have thermal breaks. The glass matters as much as the frame.

Can I get a grant for either?

Yes. The SEAI windows grant applies to complete upgrades that meet its standards, whatever the frame material.

Find vetted contractors for this work

By area:

  • Dublin North Coast: Raheny, Baldoyle, Donaghmede, Howth, Sutton, Portmarnock, Malahide
  • Dún Laoghaire & South Coast: Blackrock, Booterstown, Monkstown, Dún Laoghaire, Dalkey, Killiney
  • North Dublin City: Artane, Cabra, Clontarf, Coolock, Drumcondra, East Wall, Fairview, Glasnevin, Phibsborough, Stoneybatter
  • Dublin 15: Blanchardstown, Castleknock, Mulhuddart, Ongar, Hansfield, Ashtown
  • South West Dublin: Tallaght, Citywest, Firhouse, Knocklyon, Ballyboden, Templeogue, Walkinstown, Kimmage, Rathfarnham, Terenure
  • South Dublin City: Ballsbridge, Donnybrook, Sandymount, Ranelagh, Rathgar, Harold's Cross, Churchtown, Dundrum
  • North County Dublin: Swords, Lusk, Rush, Skerries
  • West Dublin & Leixlip: Chapelizod, Palmerstown, Lucan, Leixlip, Adamstown, Clondalkin
  • Stillorgan, Sandyford & Foxrock: Mount Merrion, Stillorgan, Goatstown, Sandyford, Cherrywood, Cabinteely, Foxrock, Deansgrange

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