Replacement double-glazed and triple-glazed units, made to measure for UK retrofit. Configure your unit below: choose glass type, cavity width, gas fill (argon or krypton), performance options (low-E, acoustic, safety), and frame compatibility. Get an instant price, save your configuration, and order online. Standard double-glazed units are made and dispatched in 5–7 working days.
Every unit is manufactured to BS EN 1279 and made for us by a partner factory. If you're not sure of the spec, our glass calculator recommends one based on your window's current performance and the room it sits in.
Build Your Replacement Double-Glazed Unit
Replacement double-glazed and triple-glazed units, made to measure for UK retrofit. Configure your unit by glass type, cavity width, gas fill (argon or krypton), and performance options. Manufactured to BS EN 1279, supplied through our FENSA-registered network, dispatched within 5 working days.
Step 1 of 5
RAL Colour
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1200 mm1400 mm
1.2W/m²K
U-value measures how much heat passes through the glass. Lower is better — a value below 1.4 meets UK Building Regulations. Your selection’s estimated thermal performance is shown here.
Drag edges to resize · Hover glass for info
Cross-Section
Getting Started
What are you replacing and how big is it?
Which part of the conservatory?
Safety glass requiredBuilding Regulations require toughened glass for this installation type. This will be automatically applied.
Non-mainland UK delivery (NI, Channel Islands, Isle of Man, Highlands & Islands)
available via manual quote — pricing shown is mainland-only.
Glass Selection
Choose your glass type and configuration
Performance & upgrades
We've pre-selected the most popular spec — change only what you need.
Core specification
Optional upgrades
Up to 5× stronger — required for doors, skylights & low-level glazing.
Warmer rooms and less condensation — most customers add this.
Design Options
Add cutouts, Georgian bars and other design extras
Design extras+£0
Georgian bars are only available with clear glass
Decorative lead was removed — cannot combine with Georgian bars
Bar Colour
Bar Width
Grid Layout
Bar Spacing
Measure from the edge of the glass to the centre of each bar, not the edge of the bar.
Vertical bars (left to right)
Horizontal bars (top to bottom)
The bar spacing looks uneven. This is fine if you're matching an existing pattern, but double-check your measurements.
Total bars: 2 × £50.0 = £100.0
Georgian bars were removed — cannot combine with decorative lead
Lead Pattern
Drawing Required
Please provide a drawing or measurements showing your desired lead pattern layout.
You can describe it in Special Requests below, or email it after placing your order.
We'll confirm pricing and layout before manufacturing.
Add a reference photo (optional)
Upload a photo of your existing window so we can match the bar pattern exactly
Click to upload or drag and drop
Up to 3 photos, max 10MB each
Photos help us get your order right first time
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Review & Order
Check your configuration summary before ordering
Show price breakdown
Energy Savings Estimate
Energy Savings Estimate
Standard Double Glazing
2.80W/m²K
C
Your Configuration
1.40W/m²K
A
50%Heat loss reduction
£0Est. annual saving
—Payback period
Based on average UK heating costs (4.2p/kWh gas) and 2,000 heating hours/year.
Actual savings depend on property insulation and heating habits.
Technical Specifications
What happens next?
Continue to Checkout opens a secure Shopify-hosted invoice with your exact specification. Pay by card or bank transfer; manufacturing begins on cleared payment. Standard double-glazed units are dispatched within 5–7 working days; toughened, laminated and triple-glazed units within 10–14 working days.
£108.00inc. VAT
Step 1 of 5
Frominc. VAT5–7 working daysMinimum order applies for small panes
FENSA Registered10-Year Warranty
Qty
Request a Quote
We'll prepare a detailed quote for your custom glass unit and get back to you within 24 hours.
Quote Request Submitted!
We've received your request and will email you a detailed quote within 24 hours.
Reference:
How to Measure Your Glass
Accurate measurements ensure your glass unit fits perfectly. Follow these simple steps.
1
Measure the Width
Measure the glass only from left edge to right edge, not including the frame or beading. Take measurements at the top, middle, and bottom — use the smallest measurement.
2
Measure the Height
Measure the glass only from top edge to bottom edge, not including the frame or beading. Take measurements at the left, centre, and right — use the smallest measurement.
3
Add 25mm to Each
Add 25mm to the width and 25mm to the height. This allows for the part of the unit that sits hidden in the frame. The result is the sealed-unit size to enter in the configurator.
4
Check the Unit Thickness
Measure the depth of the rebate (the channel the glass sits in). This determines which unit thickness will fit. Common thicknesses: 24mm, 28mm, 32mm, 36mm.
Top Tips
Always use a metal tape measure for accuracy — fabric tapes can stretch.
Measure in millimetres (mm) for precision.
For shaped or curved glass, please contact us for a bespoke quote.
If in doubt, measure the old glass unit you're replacing.
New build? Your window manufacturer can provide the exact glass size needed.
Enter your dimensions. Measure the visible glass, then add 25 mm to the width and 25 mm to the height. Our measuring guide walks you through the four numbers you need.
Pick your glass and performance. Choose double or triple glazing, glass thickness, low-E coating, gas fill (argon vs krypton), and any acoustic, safety, or privacy options.
Review your spec and price. The configurator shows the U-value, acoustic rating, and total weight, plus a delivery estimate to your postcode.
Order or save for later. Add to cart for instant order, or request a free quote if you'd like our team to confirm the spec before you pay.
What you'll need before you start
Order width and height (mm) — measure the visible glass edge to edge (not the frame opening), then add 25 mm to each.
Frame depth — affects whether 28 mm standard or slim cavities will fit.
Frame material — uPVC, aluminium, or timber. Determines compatible spacer types.
Glass type of the existing unit (if known) — clear, low-E, acoustic, or toughened. Helps the configurator default to a sensible like-for-like spec.
How we calculate your price
The price is built from four inputs: unit area (m²), glass and coating spec, performance options (gas fill, spacer, low-E grade), and delivery zone. There are no hidden surcharges — VAT is included, delivery is shown at checkout (free to Bristol BS postcodes, £150 + VAT elsewhere on the UK mainland), and trade discounts are 5% at 5+ units, 10% at 20+ and 15% at 50+.
Lead times
Specification
Made and dispatched in
Standard double-glazed
5–7 working days
Triple-glazed
10–14 working days
Toughened or laminated (including acoustic laminated)
10–14 working days
We email you your delivery day the day before.
Frequently asked questions
Can I configure a unit if I'm not sure of the exact size?
Pick "Quote rather than buy" at the end. We'll review the spec and ask for clarification on any measurement we'd want re-checked before manufacture.
How accurate do my measurements need to be?
Measure the visible glass, then add 25 mm to the width and 25 mm to the height. Units are made to the sizes you give us; if a size is wrong, we remake the unit and you pay the same price again. Our measuring guide covers how to take a reliable measurement.
What's the difference between a quote and an order?
An order is paid for and goes into manufacture. A quote is free, holds the price for 30 days, and lets you confirm the spec by phone or email before paying.
Do you supply trade and self-build customers?
Yes. Trade accounts get volume discounts of 5% at 5+ units, 10% at 20+ and 15% at 50+. We don't offer 30-day credit terms. Apply for a trade account.
What if my window has an unusual shape (arched, triangular, shaped)?
Use the configurator for rectangular units. For shaped glass, send dimensions and a sketch via the contact form — we make it to your template.
How long does the gas fill last?
Per BS EN 1279-3, leak rate is capped at 1% per year. A well-built unit typically retains 80–85% of its argon or krypton fill at the 20-year mark. Misted units (where the perimeter seal has failed) lose fill rapidly and need replacing.
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