Knowledge Centre
What is permitted development, what is not, and how the National Park, conservation areas and listed status change a specification. Plus the regulations that always apply.
Flagship guide · 10 min read
From the first conversation about draughty windows to the day the fitting team leaves, a glazing project has a natural sequence. This guide sets it out in full, so you know what to expect and when.
Flagship guide · 3 min read
A fire rating is decided by where the door sits, not by what it is made of. Here is how to work out which of your openings need one, and who signs it off.
Planning & Regulations · 3 min read
Most window and door replacements do not need planning permission, but several common situations change that answer.
Planning & Regulations · 3 min read
Conservation area status does not ban new windows, but it does change what needs permission and what a planning officer will expect to see.
Planning & Regulations · 3 min read
Listed status makes consent a legal requirement for almost any change, but it also opens the door to some excellent heritage-specification alternatives.
Planning & Regulations · 3 min read
Building regulations apply to nearly every window and door replacement, regardless of planning permission, and cover far more than just thermal performance.
Planning & Regulations · 3 min read
Fire safety touches glazing in two distinct ways: providing an escape route, and in some cases resisting fire itself. It pays to know which applies to your project.
Planning & Regulations · 3 min read
A bedroom above ground floor usually needs a window that can double as an emergency exit. The dimensions are specific, and worth checking before you order.
Planning & Regulations · 3 min read
Energy regulations for glazing have tightened steadily, and most homeowners now choose a specification well above the legal minimum rather than to it.
Planning & Regulations · 3 min read
Part L is the specific regulation that sets the minimum energy performance for replacement windows and doors. Here is what it actually requires.
Planning & Regulations · 3 min read
FENSA is the scheme that lets a window installer self-certify building regulations compliance without a separate building control application.
Planning & Regulations · 3 min read
What the regulations ask for, what certification proves, and the paperwork worth keeping.
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