It is one of the first questions every homeowner asks, and a fair one. Working out how much to double glaze a house depends mostly on the size of your home and the number of windows, but the material, style and state of your openings all play a part. This guide gives realistic 2026 ranges by property size, with worked examples, so you can budget sensibly before you get a quote.
The short answer
For a whole house, most people spend somewhere between around 3,000 and 15,000 pounds, supplied and fitted, depending on size and specification. A small terrace sits at the lower end, a large detached home at the upper end. Below we break that down so the figure makes more sense for your home.
What drives the price
Before the numbers, it helps to know what actually moves them. The main factors are:
- Number of windows. The single biggest driver. More openings, more cost.
- Size and style. Large or feature windows (bays, bows) cost more than small standard ones.
- Frame material. uPVC is the most affordable, aluminium costs more, timber more again.
- Glass specification. Standard double glazing, upgraded low-emissivity glass, acoustic or triple glazing all change the price.
- Condition of the openings. Rotten timber, awkward access or structural work adds cost.
- Doors. If you are replacing doors at the same time, they add to the total.
Keep these in mind as you read the ranges, because they explain why two similar houses can get different quotes.
Cost by property size in 2026
Here are rough 2026 guide ranges, supplied and fitted in uPVC, which is the most common choice. Aluminium and timber will cost more.
Terraced house
A typical terrace has fewer windows, often around five to eight. As a rough guide, expect somewhere around 3,000 to 6,500 pounds for the whole house in uPVC. York has plenty of period terraces, and if yours needs heritage-style frames or has bay windows, budget towards the higher end.
Semi-detached house
A semi usually has more windows, often eight to eleven. A realistic range is around 5,000 to 9,000 pounds in uPVC. Add a bay window or two, or upgrade the glass, and you move up within or beyond that band.
Detached house
A detached home has the most windows and often larger ones, so it sits highest. Expect roughly 8,000 to 15,000 pounds or more in uPVC, with larger or higher-spec homes climbing further. Aluminium framing on a big detached house can push the total up noticeably.
These are ballpark ranges to help you plan, not a quote. The only way to know your own figure is a measured survey. You can request a free quote and we will price your actual windows.
Worked examples
To make it concrete, here are three simple illustrations. These are examples for guidance, not fixed prices.
- Mid-terrace, six uPVC casement windows, standard glass: likely around 3,500 to 5,500 pounds.
- Three-bed semi, nine uPVC windows including one bay, upgraded glass: likely around 6,000 to 8,500 pounds.
- Four-bed detached, twelve windows, some large, uPVC: likely around 9,000 to 13,000 pounds, more with aluminium.
Your home will differ, but these show how size and spec shift the total.
uPVC, aluminium or timber?
Material makes a real difference to the bill. uPVC gives the best value and low maintenance, which is why most whole-house jobs use it, and you can see the styles in our uPVC window range. Aluminium costs more but offers slim, strong frames and a modern look. Timber costs most and needs upkeep, but suits period and conservation homes where character matters. Mixing materials, say uPVC at the back and heritage frames at the front, is common and can balance cost against looks.
Ways to manage the cost
You do not always have to do everything at once. A few honest pointers:
- Phase the work room by room or floor by floor if a whole-house job is too much in one go.
- Prioritise the worst windows first, the single-glazed, draughty or misted ones.
- Consider repairs where a window is fairly new and only has a failed seal or broken lock. A repair is often far cheaper than replacement.
- Get more than one quote so you can compare like for like.
Is it worth it?
Double glazing a whole house is a real investment, but it pays back in comfort, quieter rooms, less condensation and lower heat loss over the years. On a period property it can also help the home sell. The Energy Saving Trust publishes independent guidance on the savings if you want to dig into the numbers. For most homes with old or single glazing, the sums add up over time.
FAQs
How much does it cost to double glaze a whole house in 2026?
As a rough 2026 guide in uPVC, expect around 3,000 to 6,500 pounds for a terrace, 5,000 to 9,000 pounds for a semi, and 8,000 to 15,000 pounds or more for a detached home. Aluminium and timber cost more. Get a measured quote for a firm figure.
What is the biggest factor in the cost of double glazing?
The number of windows is the biggest driver, followed by their size and style, the frame material and the glass specification. The condition of your existing openings and whether you include doors also affect the total.
Is uPVC or aluminium double glazing cheaper?
uPVC is cheaper and is the most common choice for whole-house jobs. Aluminium costs more but offers slimmer, stronger frames and a modern look. Timber costs the most and needs regular maintenance, though it suits period and conservation homes.
Can I double glaze my house in stages to spread the cost?
Yes. Many homeowners phase the work room by room or floor by floor, starting with the worst windows first. It costs a little more overall than doing everything at once but makes a large project more manageable.
Does double glazing save money on energy bills?
Modern double glazing reduces heat loss compared with old or single glazing, so it typically helps lower heating bills over time. The exact saving depends on your current windows, home and heating, so treat it as a long-term benefit rather than an instant one.
Want to see the styles and finishes behind these figures? Download our latest brochure, or request a free quote and we will give you an honest price for your home.