Windows

M

macmonnie

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As future self-builders we are currently working our way through detailed design following the grant of planning for the renovation of our existing cottage and new extension.

One issue we are struggling with is our windows - and I'm hoping somebody might be able to offer us some advice.

We will have large areas of glazing throughout the house (125sqm including 9sqm of rooflights). As the floor area of the house will be 252 sqm - in order to comply with Part L the windows would have to achieve a total u value of 1.14.

Our dilema is this - we have two options as far as we can see...

Get our windows from a supplier who can certify the u-value (can anyone recommend a supplier for triple glazed, outward opening timber windows??)

or

Reduce the amount of glazing by 20sqm so that we can demonstrate compliance with Part L (using DEAP.... which calculates the lowest u-value for an 'uncertified' triple glazed timber window at 1.3)

In going for the second option this would allow us to source our windows from a family member who is in the industry saving us a fortune but would have a major impact on the design of the house. Is there anyway we can get around this?? We'd appreciate your help on this.
 
Surely your family member can source these through their company at trade rates, saving you half a fortune and giving you a local firm to install and warranty the installation.
 
Thanks Sconhome - in our situation we would be engaging the company our family member works for to make the windows. Unfortunately it has become prohibitive for a small firm to get certification for their windows - it's really only the bigger firms that can afford this. Our issue is the penalty incurred in the ber / deap calculations for not having a window certified by the company. I wonder is there any other way around this?
 
Hi
Be carefull with triple glazed - many glazing companies do it, but its just "triple" glazed. Only Carey Glass produce a triple glaze of Uvalue .7
You can get excellent 1.1 uvalue double glazed from them as well
Also, high proformance triple glazed has a high price, reduced light levels into house and has weight issues
Most window companies will use the glass you specifiy so look at Pilkington and CareyGlass web sites
 
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