Double Glazing Guides
Plain-English advice on what double glazing costs, how the styles differ and how to get a fair price in 2026.
These guides are written to answer one question at a time and to tell you what to do, not to sell you windows. Start with the money questions if budget is your worry, the style questions if you are not sure what suits your home, or the technical questions if you want to understand the spec on a quote. When you are ready to put numbers to it, the calculators turn your choices into a price range, and the costs hub holds the full 2026 price tables.
Cost Per Window
What a single window costs fitted, plus supply-only versus fully fitted.
Is Double Glazing Worth It?
When the savings and comfort justify the spend, and when to wait.
Casement Windows Explained
The most common UK style: how it works, what it costs and who it suits.
Sash Windows Explained
Vertical sliding windows for period homes, in uPVC or timber.
Tilt and Turn Windows Explained
Dual-opening windows that tilt or swing inward, ideal for flats.
Bay Windows Explained
Projecting three-pane windows priced per bay, with a recess inside.
Bow Windows Explained
Curved multi-pane windows priced per bow by section count.
French Windows Explained
Postless double-opening pairs for a clear, full-width view.
Flush Casement Windows Explained
Sashes that close flush with the frame for a period look.
Picture Windows Explained
Fixed non-opening panes for light and a view, the cheapest style.
uPVC Windows: Complete Guide
The value frame material: cost, lifespan and when to choose it.
Aluminium Windows: Complete Guide
Slim, strong frames for big openings and a modern look.
Timber Windows: Complete Guide
Authentic wood for period and conservation homes, with upkeep.
U-Values Explained
What the U-value means and the 1.4 W/m²K limit under the building regulations.
FENSA Explained
Why the FENSA certificate matters and what it proves about your install.
How to Avoid Being Overcharged
The sales tactics to watch for and how to read a quote like an installer.
How Long Does It Last?
Realistic lifespans for frames and sealed units, and when misting starts.
Single vs Double vs Triple
How the three glazing types compare on heat loss, cost and savings.
Window Energy Ratings
What the A++ to G band means and why A-rated is the modern standard.
Low-E Glass Explained
The invisible coating that reflects heat indoors and cuts the U-value ~40%.
Warm-Edge Spacers
How the spacer bar at the edge of the unit cuts heat loss and condensation.
Condensation Explained
Inside, outside or between the panes: what each kind tells you and how to fix it.
Trickle Vents Explained
Why most replacement windows now need them under Building Regs Part F.
Conservation Area Rules
Permitted development, Article 4 directions and what planners will accept.
Cheapest Double Glazing
The honest ways to cut the cost without ending up with a worse window.
Getting Three Quotes
How to compare quotes like-for-like and spot the red flags before you sign.
Glazing or Insulation First?
Which measure gives the better return on a tight budget, and why.
The Installation Process
Survey to sign-off: what happens at each stage and how long it takes.
Installation Day
How to prepare your home, what the fitters do, and how long it takes.
Window Removal and Disposal
What happens to your old windows, and why uPVC need not go to landfill.
Aftercare and Maintenance
Cleaning, hinges, drainage and what your guarantee and IBG actually protect.
Before you buy
Two related topics sit just outside this hub. If you are weighing one frame or spec against another, the comparison guides put the options side by side, including double versus triple glazing. And if you are on a low income, check whether you qualify for help before you pay: our double glazing grants guide explains the 2026 schemes, though only around 15% of households are eligible.