Trade guides
Practical guides on measuring, building regulations and product choices for installers, builders and specifiers.
- How to measure for replacement windowsA trade method for measuring brick openings and working out frame sizes for made-to-measure windows.
- Window Energy Ratings and U-values explainedWhat U-values and Window Energy Ratings mean, and which figure the regulations use.
- Approved Document L: replacement windows and doors in EnglandThe thermal requirements for replacement windows, doors and rooflights in England, and who is responsible.
- Safety glazing in critical locationsWhere the building regulations treat glazing as a critical location, and how toughened and laminated glass differ.
- Escape windows: sizes and rulesWhen an escape window is needed and the clear opening guidance in England.
- Trickle vents and ventilation when replacing windowsWhy trickle vents are fitted to replacement windows and what Approved Document F expects.
- uPVC or aluminium windows?A practical comparison of uPVC and aluminium windows for trade customers.
- Casement, flush sash or sliding sash?How the three main window styles differ and where each suits.
- Bifold or sliding doors?How bifold and sliding doors compare on opening width, glass and cost.
- Sealed unit build-ups explainedHow double and triple glazed units are made up: glass, spacer, gas and coatings.
- Toughened or laminated glass?The difference between toughened and laminated safety glass and where each is used.
- Composite or uPVC doors?How composite and uPVC doors compare for trade customers.
- Roof lanterns: sizing, upstands and regulationsHow to size a roof lantern and build the upstand it sits on.
- Replacing a conservatory roof with a solid roofWhy a solid conservatory roof usually needs building regulations approval.
- PAS 24 and Part Q explainedWhat PAS 24 is and when security standards apply to doors and windows.
- Trade ordering checklistWhat to include on a trade order so it is made right first time.
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