From practical uPVC windows to slender aluminium windows, whether you require one window replacement or a full house makeover,
you’re sure to find the answers to your questions below.

If you still have unanswered questions, don’t hesitate to contact us and we’ll be in touch soon.

Aluminium Windows

What is the average cost to replace windows?

Each DesignHaus window replacement project is completely bespoke to the homeowner or company. There are a number of aspects to consider when calculating window prices, which is why you won't find any fixed prices displayed on the website.

Please request a free no obligation quote and we'll tailor a competitive price to accommodate your needs.

What is the best material for a window replacement?

Again, there is no definitive answer here because it depends on several factors - most prominently, property type and individual budget. Generally, uPVC windows are known for their durable, ultra-efficient, low maintenance and relatively budget-friendly features. Aluminium windows are a common sight in commercial buildings but are fast becoming the material of choice for sleek, modern residential window replacements, including restrictive conservation projects.

Here’s a helpful comparison table for quick reference:

uPVC windows Aluminium windows
Typically last 25-30 years, exceptionally low maintenance Can last up to 45 years with minimal maintenance
Budget-friendly Can add considerable value
Thicker uPVC frames offer slightly better soundproofing qualities than other materials Slimmer frames than any other window material
Thermally sound A+ rated frames, thanks to innovative 5 - 8 chambered profiles Thermally sound A rated frames that include innovative 'thermal break' technology.
Durable weather-protection; Fade, rot, and salt corrosion resistant Outstanding weather-protection and natural corrosion resistance; Unaffected by temperature changes; actively resists twisting and warping
Environmentally responsible One of the world's most eco-friendly building materials
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upvc windows vs aluminium windows

Is planning permission required for new windows?

Planning permission doesn't tend to apply for window repairs or minor improvements. Unless any of the following points apply, it's unlikely you'll need to apply for planning permission to replace your windows:

  • It is a listed building
  • It’s in a designated area, e.g. a conservation area or an Area of Outstanding Natural Beauty (AONB)
  • The area is covered by an additional Article 4 direction
  • They don't have a similar appearance to the building
  • Replacing a standard window with a new bay window
  • Replacing an upper-floor side elevation window without obscure glazing that can open (unless the opening is 1.7 m from the floor)

What are the building regulations for Windows?

Since 1 April 2002, building regulations have applied to all replacement glazing. Setting the standards for quality and safely installed replacement windows, the regulations apply to:

  • Thermal performance

Currently, replacement windows must have a minimum WER rating of band C or a U-value no higher than 1.6 W/m2k.

  • Safety glazing

Generally, safety glazing is required in unobstructed openable areas; at least 0.33 square metres and at least 450mm high and 450mm wide.

  • Ventilation

Rooms where steam will be produced require higher levels of ventilation, e.g. larger windows or trickle vents.

  • Fire Safety

External windows may need to be fixed shut to limit the risk of fire spread.

  • Means of escape

Replacement windows can only be reduced to a size a person can safely escape through. It's also good practice to replace first floor windows with escape windows.

As FENSA approved installers, you have complete peace of mind that our window installations fully comply with the latest building regulations.

Window Styles
Aluminium Windows
Angled view of white sliding sash windows

What makes a good window?

When choosing new window replacements, it’s important to look out for the following features:

  • Modern multi point locking
  • Minimum WER rating of band C or U-value no higher than 1.6 W/m2k
  • Bespoke designs & endless customisation options, including dual colour
  • Range of quality glazing and glass options
  • Low maintenance features

What type of window is the most energy efficient?

Casement windows are the most energy efficient openable window style, thanks to strong seals on all four sides of the frame. That said, all our window styles can achieve A ratings and low U-values with ease.

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green casement

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Excellent process from the start. Work carried out was of an excellent standard with professional and polite company operatives. slight delay on two finishers for the front door however, Designhaus persevered to obtain the correct colour finishing strips and looks great. Very pleased

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My wife and I are extremely pleased with the with the tiled roof conversion to our conservatory.

The whole project was executed very efficiently by a team of well organised, friendly, and competent professionals.

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