Window systems
Compare PVC-U Window Systems
Most UK PVC-U windows are built from a small handful of profile systems. Understanding which one sits behind a quotation — and what actually determines quality — puts you in control of the comparison.
Why the profile brand isn't the whole story
A system name tells you less than you'd think
Ask five installers for a quotation and you will likely hear two or three of the same profile names come back. That's normal: a small number of systems companies supply the vast majority of British fabricators. The brand on the profile is only the starting point.
The fabricator
The company that welds and finishes the profile into a window has more influence over quality than the systems house whose name is on the extrusion.
The glass
The glazed unit — its build, spacer bar and coatings — usually does more to determine comfort and performance than the frame profile around it.
The installation
Even the best system, fabricated well, can under-perform if it is fitted, sealed or finished poorly on site.
The systems
PVC-U profile systems, compared
VEKA
Mainstream to upper-mainstream. One of the most widely fabricated PVC-U systems in Britain.
One of the best-known PVC-U systems in the UK. Widely fabricated, well supported, and available in chamfered, sculptured and flush styles.
Read the profileREHAU
Mainstream to upper-mainstream, with a strong engineering reputation.
A well-engineered German PVC-U system with a long UK history, widely used on both retrofit and new-build work.
Read the profileLiniar
Mainstream, marketed heavily on thermal design and British manufacture.
A British-designed PVC-U system built around a multi-chambered thermal design, widely offered by UK installers.
Read the profilealuplast
Mainstream, with bonded-glazing and slim-sightline options in the wider portfolio.
A German PVC-U system less often named in homeowner conversations, but well established with UK fabricators.
Read the profileProfile 22
Mainstream, strong presence in both retrofit and social housing programmes.
A long-established UK PVC-U system, widely used in domestic replacement and larger housing programmes.
Read the profileThe Residence Collection
Premium. Aimed squarely at timber-replacement and heritage-sensitive work.
A premium PVC-U collection designed to imitate traditional timber joinery, usually specified where appearance matters most.
Read the profileHow to compare
How to compare quotations that name different systems
You do not need to memorise every profile system on the market. You need to ask the same handful of questions of every quotation you receive.
- 01
Ask which exact range is quoted — chamfered, sculptured or flush — not just the brand name.
- 02
Ask who fabricates the profile and how long the installer has worked with them.
- 03
Ask what glass unit, spacer bar and hardware are included — these usually vary more than the frame.
- 04
Use our comparison pages to see two systems set out side by side on the points that actually matter.