Replacing seals in uPVC windows: 2026 prices for flats and houses

indekscen.pl editorial team · published 30 September 2026 · prices according to the 5 October 2026 index

Having a professional replace the seals in a uPVC window most often costs PLN 110 per window (typically PLN 100 ‑ 175), including materials in all-inclusive quotes. For a flat with five windows, the cost is around PLN 550, and for a house with twelve windows, around PLN 1,300. Large patio windows cost more, up to PLN 250.

A draughty window in a flat or house can usually be repaired much more cheaply than you might think. Before ordering new windows, check the seals: they may be responsible for draughts, whistling wind and moisture on the windowsill. Below, we calculate the cost of replacing seals in one uPVC window, a flat and a house, and compare it with window adjustment and glass replacement. The prices come from window service company price lists collected by indekscen.pl.

How much does it cost to replace seals in uPVC windows?

Replacing seals in uPVC windows most often costs PLN 110 per window, according to 5 price lists collected by indekscen.pl, while half of the quotes fall within the range of PLN 100 ‑ 175. In all-inclusive quotes, the price covers removing the old seal, supplying a new seal, usually EPDM, and fitting it.

The full range is wide, from PLN 50 to PLN 250. The lowest rates apply to small, single-sash windows, and the highest to large patio windows and non-standard designs. Some companies have a minimum job value, so replacing the seal in one window costs more per window than replacing seals in several.

How much does it cost to replace seals throughout a flat or house?

Replacing the seals in a flat with five windows costs around PLN 550, based on the median for seal replacement in uPVC windows. Here is an example for typical property sizes:

Example	Number of windows	Cost based on the median	Typical cost
Studio flat	3	PLN 330	PLN 300 ‑ 530
3‑room flat	5	PLN 550	PLN 500 ‑ 880
Detached house	12	PLN 1,300	PLN 1,200 ‑ 2,100

For a larger number of windows, it is worth negotiating the rate per window, as the professional only has to make one trip and can complete everything in one visit. A balcony door is usually priced like a large window because it requires more metres of seal.

Do companies charge for replacing seals per window or per linear metre?

Most companies quote a price for replacing seals per window, but some charge per linear metre of seal, which can be more advantageous for the company than the customer when the windows are large. A standard single-sash uPVC window has around 5 linear metres of compression seal, with double-sash windows and balcony doors requiring correspondingly more.

When you receive a quote ‘per linear metre’, ask for it to be calculated for your specific windows and compare it with the median of PLN 110 per window. Also ask whether the price includes materials, as some price lists quote labour only.

Compression seals or glazing seals: which need replacing?

A uPVC window has two types of seals: compression seals, located between the sash and the frame, and glazing seals, which hold the glass in the sash. Compression seals are replaced most often because they flex whenever the window is opened and closed and are responsible for preventing draughts.

Replacing glazing seals in uPVC windows requires more work because the glazing beads often need to be removed. This is done when the seal around the glass is cracked or coming away, or when water collects beneath the glass. The professional can also check whether the insulated glass unit has lost its seal.

Is replacing window seals worthwhile?

Replacing window seals is worthwhile when the frames and hardware are in good condition and the only problem is worn rubber. For around PLN 110 per window, you can restore its airtightness, while a new window with installation costs around PLN 2,350. Here is a comparison of window repairs:

Median and typical range from public price lists, as at 5 October 2026. Each price includes a source and quotation on the service page.

Replacing the seals will not help if the window is poorly adjusted, has worn hardware or a cracked frame. In that case, window adjustment is needed first. For old, warped windows, replacing the entire window may be more sensible, as described in our article replacing windows in a block of flats: price.

How much do seal replacement and window adjustment cost?

Window seal replacement and adjustment are usually carried out during one visit: adjusting the sash generally costs PLN 58 ‑ 125, while replacing the seals in a window costs PLN 100 ‑ 175. Window service price lists quote around PLN 85 per window for seal replacement alongside adjustment, as the professional is already on site.

The order matters. The seals are replaced first, followed by adjustment of the compression, because a new, thicker seal changes how the sash meets the frame. You can read more about adjustment, including switching windows between winter and summer settings, in our article adjusting uPVC windows: cost.

How often should window seals be replaced?

Seals in uPVC windows are usually replaced every 10 to 15 years, but they may need replacing after just a few years if they are not maintained or are exposed to strong sunlight. There is no need to wait for a specific date. It is better to look for these signs:

1. A draught with the window closed or the sound of wind whistling.
2. A hard, cracked or flattened seal, which does not return to its original shape when pressed.
3. Moisture, frost or mould around the edge of the sash.
4. A sheet of paper trapped by the sash slides out without resistance.

How are seals replaced in uPVC windows?

Seals in uPVC windows are replaced by pulling the old seal out of the profile groove and pressing in a new one, cut to length and joined at the corners. A professional can do this in around a dozen minutes per window. You can replace the seals yourself, but you need to buy a seal that matches the profile system, which requires identifying the window manufacturer. The wrong seal will be either too thin or too thick, and the window will still let air through or become difficult to close.

Which seals should you choose for uPVC windows?

EPDM rubber seals are most commonly used for uPVC windows, with thermoplastic elastomer (TPE) or silicone seals used less often. EPDM is resistant to frost, UV radiation and temperature changes, so professionals choose it most often, and many companies include it in the replacement price. Silicone seals are highly flexible but more expensive and are mainly found in high-performance windows.

The seal profile is more important than the material. It must fit the groove in the frame and sash of the specific window system, otherwise it will not provide the correct compression. A good service company will identify the profile manufacturer from the markings on the frame and select a seal supplied by the manufacturer or a compatible equivalent.

How can you avoid overpaying for seal replacement?

• Combine the work. Replacing the seals in all windows at once costs less per window than calling out a professional for just one.
• Combine it with adjustment. One visit instead of two saves the cost of an additional call-out.
• Ask what the price includes. Materials, travel and disposal of the old seals.
• Ask for the hardware to be inspected. If it is worn, replacing the seals alone will not be enough, while replacing the hardware costs around PLN 325 per sash.
• Maintain the new seals so that they will not need replacing again for as long as possible.

You can find more prices for minor home repairs in the repairs and tradespeople category. We show the median from several price lists and the typical range, making it easy to check whether a professional’s quote is reasonable.

„Cena : Średni koszt wymiany uszczelek w standardowym oknie wynosi od 50 do 150 zł w zależności od rozmiaru i typu uszczelek.”

OknoSerwis.com, source

„Koszt wymiany uszczelek w jednym oknie to około 50 do 120 złotych, w zależności od rozmiaru i typu okna.”

Dobroplast, 2025-11, source

„koszt wymiany uszczelki w jednym oknie wynosi zazwyczaj od 100 do 250 zł, choć przy dużych oknach tarasowych lub nietypowych konstrukcjach cena może przekroczyć 300 zł.”

Muratordom.pl, 2026, source

„Standardowe okno PCV (1 skrzydło, ~5 mb) | 100-120 zł”

ProfOkno, 2026, source

The prices in this article come from public price lists published by window service companies and from trade articles. Each entry on the how much does it cost to replace window seals page includes the source, date and a verbatim quotation.

Frequently asked questions

How much does it cost to replace a seal in a uPVC window?

Wymiana uszczelek w jednym oknie PCV kosztuje zwykle PLN 100 ‑ 175, od PLN 50 za małe okno do PLN 250 za duże albo nietypowe.

Does replacing window seals make a difference?

Tak, jeśli stare uszczelki są twarde, popękane albo spłaszczone. Nowa uszczelka likwiduje przeciągi i gwizd wiatru, a za cenę około PLN 110 za okno poprawia szczelność bez wymiany całego okna.

Can you replace window seals yourself?

Tak, uszczelki przylgowe w oknach PCV wciska się w rowek profilu bez specjalnych narzędzi. Trudność polega na dobraniu uszczelki pasującej do systemu profili, dlatego wiele osób zleca to fachowcowi za PLN 100 ‑ 175 za okno.

How much does it cost to replace seals in wooden windows?

Okna drewniane często wymagają frezowania rowka pod nową uszczelkę, więc wymiana bywa droższa niż w PCV i częściej bliżej górnej granicy, czyli PLN 250 za okno. Osobnej mediany dla okien drewnianych w indeksie nie mamy.

How should you care for seals so that they last longer?

Raz lub dwa razy w roku przetrzyj uszczelki wilgotną ściereczką i posmaruj preparatem silikonowym albo wazeliną techniczną. Taka konserwacja kosztuje niewiele, a przedłuża życie uszczelek o lata.

Translation of the original Polish article dated 30 September 2026. Quotations from price lists are in Polish, as published by the companies. Read the original in Polish.

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