uPVC vs Aluminium Windows
Three good materials, three different jobs. Here is how we choose between them on real surveys.
There is no single best window material. There is a best material for a particular building, budget and exposure, and the honest comparison is the one that admits where each option loses.
We fit all three, so we have no reason to push you toward one. The notes below are the same ones we talk through at survey.
uPVC: the value and low maintenance choice
Modern multi chamber uPVC is thermally excellent for the money and needs nothing but washing. Flush casement profiles have closed much of the aesthetic gap with timber, and foiled heritage colours hold up well in the South West climate.
Where it loses: sightlines are chunkier than aluminium.
Engineered timber: the heritage and premium choice
Engineered laminated hardwood is far more stable than solid softwood, holds factory microporous paint for years and accepts slim double glazed units without ruining period proportions.
Where it loses: it is the most expensive option and it needs recoating in time, typically every eight to ten years on exposed elevations.
Aluminium: the slim and structural choice
Aluminium carries big glass on small frames, which is why it dominates contemporary extensions and large openings. Powder coated finishes are extremely durable and it is dimensionally rock solid.
Where it loses: cost sits between uPVC and timber, and on a small cottage window the crisp modern look can be wrong for the building.
Choosing by property type
- Period cottage: timber or uPVC flush casement
- Nineteen sixties to nineteen nineties estate housing: uPVC casement
- Contemporary extension or large picture window: aluminium
- Coastal exposure: uPVC or marine grade powder coated aluminium
- Rental property: uPVC for the maintenance profile
Timber or aluminium: the two way decision
When uPVC is ruled out, the choice narrows to timber or aluminium. Timber suits period and rural homes and can be repaired and repainted indefinitely. Aluminium gives the slimmest sightlines, suits contemporary builds and barn conversions, and its factory powder coat needs little more than a rinse.
On cost, slim aluminium casements typically run around £950 to £1,600 per opening fitted and engineered hardwood around £1,200 to £2,000. Near the sea, both work with marine grade hardware; timber needs its paint kept intact, aluminium needs an occasional fresh water wash.
uPVC vs aluminium windows: compare the complete opening
For a homeowner choosing between uPVC and aluminium, compare the visible frame, opening arrangement and glazing as one specification. uPVC offers standard and flush casement options; aluminium is relevant where slimmer sightlines matter. Neither material should be chosen solely from a close-up photograph that leaves out the rest of the elevation.
Ask for both options against the same opening sizes and the same intended use. A wide fixed pane and a set of smaller opening sashes are different designs, even if the material is identical. The written quote should make those distinctions visible so you compare like with like.
Casement vs flush casement is a separate choice
A casement describes an opening style, while flush describes how its sash sits when closed. A standard casement has a stepped outer face; a flush casement closes level with the surrounding frame. Asking whether casement windows are better does not identify which of those profiles is being compared.
Look at the whole frontage and the window pattern that will remain. A flush profile may suit the appearance you want, but the specification, fitting and sealing still matter. Decide material, profile and colour together rather than using one label as a shortcut for the whole window.
Before the survey, list what matters most in each room: a clear view, easy operation, a consistent frontage or a particular finish. Include windows that will remain so the new specification can be considered alongside them. That is a more useful starting point than asking which material is best in every situation. Keep the opening arrangement, glazing and installation work consistent when comparing the written options.
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Covering the South West (Devon, Cornwall, Dorset and Somerset).
Questions people ask
Which lasts longest?
Engineered hardwood frames can pass sixty years with maintenance. Good uPVC runs twenty five to thirty five years, aluminium similar or longer. Sealed units are the shorter lived part of any window.
Can I mix materials on one house?
Yes, and it is common. Timber on the road facing elevation and uPVC at the rear is a normal, sensible compromise.
Which is warmest?
With equivalent glazing the differences are small. Frame material matters less than the sealed unit, the spacer bar and the quality of the fit.
What about timber effect uPVC?
Grained foils are convincing at a distance and fine for most homes.
Are flush windows different from casement windows?
Flush describes the sash sitting level with the frame. A flush window can be a casement; a standard casement has a stepped face.
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