Sash Window Replacement, Renovation and Upgrade FAQs
Listed below are questions we are often asked. Please take some time to look over these before submitting a general enquiry. We have answered here as concisely as we can to cover more topics without too much reading, with many of the questions covered in greater detail in the relevant areas of our website. There is also a customer service section at the bottom of the site with more detailed information.
Questions About Services
A complete replacement comprises new sashes AND case (window surround). Replacing your whole window is usually only required when the existing case (surround) is beyond repair or if none is currently in situ.
Questions On Glazing
As a general rule, they do not. Slimline units are typically either 14mm 4/6/4 or 12mm 4/4/4 and allow for installation to historic windows. They are seen as a compromise for local authorities so that double glazing does not affect the character of the building. Most councils will allow the installation of slimline units in conservation areas and listed buildings.
Our argon filled, warm edge spacer units have a u value of:
14mm (4/6/4) Units – U Value 2.0
16mm (4/8/4) Units – U Value 1.6
18mm (4/10/4) Units – U Value 1.4
Low E or low emissivity glass has a film on one side of the glass that improves thermal retention when used in a double glazed unit.
- Low E glass helps reduce Energy Costs
- Low E glass blocks infrared light from penetrating the glass from the outside
- Low E Windows Reduce Destructive UV Rays. These coatings help reduce ultraviolet (UV) light
- Low E glass has a slight blue/green tint to it
- Low E Windows Do Not Block All Natural Light
Fineo is a new type of vacuum-sealed unit manufactured in Belgium, which offers a better U Value than standard units while retaining a thin profile. It has a better lifespan than conventional units and also improves accoustic dampening. These units are ideal for Georgian style multi-pane windows.
Fineo 8 (7.7mm thick) has a U Value of 0.7
Any units which are less than 800mm from floor to glass are required to be toughened glass. Toughened Fineo is available however this comes with a visible vaccuum port on the corner of each individual unit. As this can be unsightly particularly in multi-paned windows, we can apply a clear safety film if requested.
Please see the Energlaze website here: https://www.energlaze.co.uk/
Not necessarily. Several factors cause condensation, and while double glazing will help, it may not eliminate it entirely. The ambient moisture levels in the property and outside temperature extremes are governing factors here. When possible, rooms should be well ventilated to allow air circulation.
Yes, although it depends on the dimensions of the existing sashes, primarily the astragals on multi-pane windows. The process can be quite destructive to the existing timbers and, the overall finish is usually not as neat as with new sashes.
Toughened, also known as safety glass, has been heat-treated in a furnace to give it extra strength against impact. If any portion of a pane of glass is below 800mm from floor level, toughened glass is a requirement.
Double glazed units are deemed to be failed if there is water or condensation visible inside the unit. A slight haze can sometimes appear on the glass in certain temperatures however this does not mean the unit has failed.
Questions On Works
Yes! Our fitters and painters will do their best to keep disruption to a minimum during works and allow access as needed.
If our fitters finish up at the end of the day and with a window incomplete, they will temporarily secure either the old windows or the replacements in position before leaving.
As a rule of thumb, windows take a little more than one day per fitter, and we usually have two fitters per job, depending on staffing levels. Painting usually takes slightly less time than fitting but can be impacted by inclement weather.