How much does it cost to install a PVC window in 2026?
The cost of installing a PVC window ranges from €50 to €300 per window, depending on the type of work required. A basic installation without masonry ranges from €50 to €90, while an installation requiring brickwork can reach €300.
Here are the indicative installation prices by complexity:
| Installation type | Indicative cost |
|---|---|
| Basic installation (no masonry) | €50 – €90 / window |
| Installation with subframe | €80 – €130 / window |
| Installation with masonry work | €150 – €300 / window |
| Full flat (8-10 windows) | €500 – €1,200 |
These prices do not include the window itself, only labour. To calculate the window price, use our window price calculator. Professional installation represents between 15% and 30% of the total budget for a window replacement.
Types of window installation
There are three main types of installation, each with a different level of complexity and price:
Installation without masonry (direct renovation)
The old window is removed and the new one is placed directly in the existing opening, using mechanical anchors and neutral silicone. It is the fastest (1-2 hours per window) and most economical option. Ideal when the existing frame is in good condition and the new window has the same dimensions.
Installation with subframe
A aluminium or PVC subframe is first fixed to the masonry, and the window is then fitted onto it. This is the most professional method and allows better levelling and plumbing. The subframe also facilitates perimeter sealing with foam or tape, improving insulation. Time: 2-3 hours per window.
Installation with masonry work
Required when changing the opening size, removing the old frame embedded in the wall or repairing the sill. Includes plastering and finishing work. Time: 3-5 hours per window plus 1-2 days drying time.
Installation with polyurethane foam
Polyurethane foam is the most commonly used sealing material in window installation. It is applied around the perimeter between the window and the wall to fill the gap and provide thermal and acoustic insulation.
There are two main types of polyurethane foam for windows:
- Conventional foam (1 component): Expands on contact with air moisture. Affordable and easy to apply. Suitable for standard installations with gaps of 10-30mm.
- Low-expansion foam: Designed for windows, it expands less than conventional foam and does not deform the frame. Essential for PVC windows.
- Adhesive foam (Mega or Flex type): Combines sealing and fixing, eliminating the need for mechanical anchors in some cases. Provides greater elasticity and absorbs thermal expansion.
Conventional foam is sufficient for most residential installations, but for projects seeking energy certification or Passive House standard, it is recommended to combine it with self-expanding tape.
Self-expanding tape for Passive House certification
Self-expanding tape (also called compressed sealing tape or PSUL) is the most advanced sealing system for window installation. It is mandatory for Passive House certification and the preferred choice for high energy efficiency installations.
How does it work? The tape is compressed during installation and then slowly expands to completely fill the gap between the window and the wall. Its advantages:
- Airtightness: Classified as Class 1 according to DIN 18542, preventing cold air infiltration.
- Vapour permeability: Allows interior moisture to escape outward, preventing condensation and mould in the joint.
- Rain impermeability: Protects against wind-driven rain penetration.
- Durability: Maintains its properties throughout the window's lifespan (30+ years), unlike silicone which degrades over time.
Leading brands such as Veka and Kömmerling recommend installation with self-expanding tape to ensure their premium profiles perform to their full potential.
High-density foam certified Passive House
There is a third option for the most demanding projects: high-density polyurethane foam certified by the Passive House Institute (PHI). Brands such as Illbruck, Tremco or Hanno manufacture specific foams that meet Passive House standard requirements.
These foams have a thermal conductivity below 0.035 W/mK (compared to 0.040 W/mK for conventional foam), and maintain their insulation properties even in wide joints (up to 40mm). They are also compatible with self-expanding tape, allowing a triple sealing system: interior tape + foam core + exterior tape.
The additional cost of using Passive House certified materials is approximately €3-5 per linear metre of joint, an insignificant cost compared to the energy savings over the 30+ year lifespan of the window. Request a personalised quote.
Thermal camera verification: the ultimate test
Infrared thermography is the most reliable way to verify that a window installation has been carried out correctly. A thermal camera shows temperature differences on the wall and window surface, instantly revealing any thermal bridge, air infiltration or sealing defect.
At Instal Tancaments we carry out thermal camera verification on all installations that require it. The test is performed with an interior-exterior temperature difference of at least 10°C (ideal in winter).
If you're replacing windows and want the peace of mind of knowing the installation is perfect, ask your installer for a post-installation thermographic test. For more information, see our guide to the best PVC window manufacturers.
How long does installation take?
A standard window installation takes between 1 and 3 hours, depending on the type of installation. A full flat with 8-10 windows can be installed in one day without masonry work.
The manufacturing and delivery time for a custom window is 3 to 5 weeks from order confirmation. Contact us to confirm availability and lead times.
Professional installation vs. DIY: is it worth it?
Installing a window seems straightforward, but incorrect installation can negate all the benefits of a quality window. The most common window installation mistakes include thermal bridges, poor sealing and misaligned frames.
Professional installation guarantees perfect plumbing of the frame, certified sealing of the perimeter joint and hardware adjustment for optimal closing.
If you're looking for professional installation with top-quality materials, request a no-obligation quote or calculate your window price with our online calculator.
Frequently asked questions about window installation
How much does it cost to install a PVC window?
Installing a PVC window costs between €50 and €300 per window. A basic installation without masonry ranges from €50 to €90. With subframe, €80 to €130. If masonry work is needed, the cost can reach €150-€300 per window.
Do I need a builder to replace windows?
Not always. If the existing frame is in good condition and the new window has the same dimensions, it can be installed without masonry using direct anchors and silicone.
Can a window be installed without masonry work?
Yes. Most window replacements are done without masonry thanks to subframes or direct anchors. The old joinery is removed, the new window is fitted with mechanical anchors and finished with neutral silicone and cover strips.
Which is better, polyurethane foam or self-expanding tape?
Self-expanding tape is superior in airtightness and durability, but more expensive. For a standard home, low-expansion foam is sufficient. For Passive House certification, self-expanding tape or a combination of both is recommended.
What is the delivery time for a custom window?
The manufacturing and delivery time for a custom window is 3 to 5 weeks from order confirmation.
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