Aluminium Window Installer

This is the question we get asked most often. Aluminium outperforms uPVC in almost every way except for the initial price. It does not warp or expand like uPVC and usually lasts over 40 years, while plastic frames last about 20 to 25 years. Aluminium frames are slimmer, come in more colours, and can hold larger glass panes without needing bulky supports. However, aluminium is about 30-50% more expensive than uPVC, depending on the specifics. If you are thinking about long-term value rather than just the upfront cost, aluminium is often more cost-effective over time because it is durable, energy-efficient, and resistant to warping and discolouration. Our window suppliers use prime billet aluminium, which gives a smoother finish and stronger structure than recycled or lower-grade aluminium, which can have defects and weaker joints.

Modern aluminium windows are very energy-efficient when they have the right thermal break technology. Older aluminium frames did not have this and were not good at retaining heat. Today’s systems use a reinforced polyamide thermal break, which is a strong plastic barrier between the inside and outside of the frame. This greatly reduces heat loss. When combined with double or triple glazing and warm-edge spacers, these windows can reach U-values as low as 1.2 W/m²K, which is as good as or better than many timber and uPVC windows. Thermally broken aluminium frames do cost more, and the quality of the thermal break can vary between manufacturers. We suggest checking the width and material of the thermal break strip, because a narrow or poorly fitted break can reduce performance.

Thermal break technology is the main reason aluminium is now used for modern windows. Pure aluminium conducts heat easily, so without a break, heat escapes in winter and enters in summer. A thermal break solves this by adding a barrier, usually a glass-fibre reinforced polyamide strip, between the inside and outside parts of the frame during manufacturing. This barrier reduces heat transfer by more than 500 times compared to solid aluminium, so the inside of the frame stays close to room temperature, with less condensation and fewer draughts. This process makes manufacturing more complex and expensive, and some lower-quality imports may use poor thermal breaks that do not work well.

When people ask about narrow frames, we explain that slimline aluminium windows are great for this. Aluminium is strong yet lightweight, so the frames can be very slim without sacrificing strength. This means you get more glass, more natural light, and better views. We often install slimline casement and tilt-and-turn windows with frames as narrow as 45mm, which is not possible with uPVC or timber unless you give up on durability. These are premium products because keeping good thermal and weather performance in a slim frame needs careful engineering and top-quality hardware. If you care about looks and natural light, especially in modern renovations, we highly recommend slimline systems, as they can significantly change the feel of a room.

Yes, you can install aluminium windows in conservation areas. We have used heritage-style aluminium systems with steel-look glazing bars that meet strict planning rules. The important thing is to match the original look and respect the building’s style. Modern aluminium can closely copy the slim frames and grid patterns of old steel Crittall windows, so they look almost the same from the street. Many systems offer astragal bars for a real industrial or Art Deco look, but without the problems of real steel. These steel-look systems cost more than standard aluminium windows, and you might need to send detailed drawings to your local conservation officer. It’s best to talk to planning authorities early. For listed buildings, you usually need formal consent. Aluminium delivers modern performance while maintaining the classic look required for heritage properties.

From our experience over the last 20 years, a good weather-resistant powder coating is one of the toughest finishes for aluminium. The process uses a dry powder that is baked onto the aluminium at high heat, making a strong bond that lasts longer than regular paint. Unlike timber, which needs regular care, or uPVC, which can fade and become brittle, powder-coated aluminium withstands sun, salt, and acid rain with very little maintenance. Most manufacturers guarantee these finishes for 25 years, and they often look great even after that. Dual-colour frames are a good choice if you want more design options without losing durability. However, dual-colour and custom RAL finishes usually add 10-15% to the price. Over time, the higher upfront cost is balanced out by lower maintenance costs.

Modern aluminium windows are very secure. Aluminium is stronger than timber or uPVC, so it is harder to break in, but the locks and hardware matter just as much. We fit multi-point locking systems as standard, which lock at three or more points around the window to spread out any force. Many of our systems meet PAS 24 security standards and can be upgraded to Secured by Design. We also use glazing that is beaded from the inside, so the glass cannot be removed from outside. Top-quality locks from brands like Yale, Roto, or Winkhaus cost more than basic ones, but investing in security is important for insurance and your family’s safety.

From our experience fixing poor installations by unaccredited workers, we know that how your windows are installed matters just as much as the windows themselves. When we conduct a survey, we check the openings, choose the right cavity closers, and ensure the frames are properly packed and sealed to prevent leaks and heat loss. It’s important to check exactly what’s included in your quote. The final price should cover essentials like locks, handles, and other hardware. Be aware that lead times may vary by manufacturer, particularly for bespoke sizes or finishes, with industry-standard delivery typically ranging from four to eight weeks. Just as crucial is choosing an installer properly approved to fit your new aluminium window. We are FENSA-accredited, so we comply with building regulations and offer an insurance-backed guarantee. In the end, a well-installed budget window can work better than a badly installed expensive one, so skilled installation is very important.