A rubber seal loses elasticity over the years: it hardens, cracks and sags. Then the window starts letting air through. First we check whether the seal really is the cause, and only then replace it. One sash takes about half an hour.
Schlegel Q-Lon polyurethane seal, not ordinary rubber
Doesn't harden in the cold, works years later
Window stays in place, glass unit stays in
Seal replacement from €7/m including material and labour
One sash about half an hour
Warranty on the work done
What we do
Which seals and work
Q
Q-Lon polyurethane
Schlegel foam seal with a protective PE skin. We select the profile to suit the window.
◲
Frame seal
We replace the old frame seal evenly along the whole frame.
▢
Glazing bead
We check and if needed replace the glazing-bead seal.
↕
Closing pressure
After replacement we adjust the closing pressure so the window closes evenly.
✓
Check
We check that the draught is gone and the window closes in every corner.
Seal replacement costs €7/m, or €10/m for a seal recessed into the frame. Material and replacement labour are included. We count the actual length of every seal run being replaced. The call-out fee is separate.
Always included
On-site check of the window's condition
Removal of the old seal and cleaning the profile
Fitting the Schlegel Q-Lon seal
Adjusting the closing pressure
Check after the work
We work year-round, including winter
Warranty on the work done
Affects the price
Number of sashes
Window profile and type
Whether hardware also needs adjusting
Distance from Tallinn
Urgency of the work
How we work
Four simple steps
1
Describe the problem
One call or message. Describe in a couple of sentences what's wrong with the window and we'll agree on a time.
2
We check on site
We come and inspect the whole window: seal, closing pressure, hardware. We tell you honestly what the problem is and what will help.
3
We fix the window
We replace the seal, adjust or repair the hardware. The window stays in place, the glass unit stays in. One sash takes about half an hour.
4
We check the result
After the work we check that the window closes evenly and the draught is gone. We give a warranty on the work done.
A draughty window? First, locate the leak
Window seal replacement is our main service. We replace worn gasket runs on uPVC windows and balcony doors, select the profile and check closing pressure. The location of the leak helps distinguish a worn gasket from a different repair.
Cracked or hardened gasket
Air passes between the sash and frame, and the gasket is damaged or does not recover its shape. We check the profile and replace the worn seal run.
A leak between the wall and frame involves the installation joint. We inspect the joint and reveals; replacing the sash gasket alone will not repair it.
Moisture inside a sealed glass unit is different from condensation on the glass surface. We inspect the glass unit; surface condensation also requires checking ventilation and humidity.
Measure each seal run that needs replacement along the gasket line. Example: a run 0.8 m wide and 1.2 m high = 2 × (0.8 + 1.2) = 4 m. Two identical runs total 8 m. Actual runs may differ, so measure each one separately.
Calculation illustration, not an installation drawing. Do not stretch the old seal for measuring or use the outside dimensions of the entire window frame.
What makes up the replacement cost?
Seal replacement costs €7/m, or €10/m for a seal recessed into the frame. Material and replacement labour are included. We count the actual length of every seal run being replaced. The call-out fee is separate.
Example: two 4 m seal runs = 8 m. Replacement including material and labour: 8 × €7 = €56 or 8 × €10 = €80 for recessed seals. Including a first Tallinn call-out, the totals are €91 or €115 respectively.
The open sash and the area where the draught occurs.
2
Cross-section
The end of the old gasket next to a ruler, if visible without damage.
3
Groove and hardware
The gasket fixing and window markings. Do not cut a sample from an intact seal run.
Before the visit, clear the windowsill and provide access to the sash. Include your town and the number of windows and balcony doors in the enquiry. We agree the visit and scope in advance.
We check the groove fixing, corners and joint, even contact and handle operation without excessive force. Schlegel recommends wiping Q-Lon roughly every three months and not painting over it. Follow manufacturer guidance for cleaning products; advice for ordinary rubber does not automatically apply to Q-Lon.
Often yes, especially if the window is over 10 years old and the seal has never been replaced. But not always. First we check whether the cause is the seal, the closing pressure or something else. If the seal won't help, we say so before the work, not after.
Seal replacement costs €7/m, or €10/m for a seal recessed into the frame. Material and replacement labour are included. We count the actual length of every seal run being replaced. The call-out fee is separate.
No. The window stays in place, the glass unit stays in. The work is done on site, replacing one sash takes about half an hour.
Q-Lon is a Schlegel composite seal with a polyurethane foam core, polyethylene skin and stabilising carrier. The manufacturer publishes recovery and weathering test data. The right profile and installation are essential for a well-sealed window.
Schlegel states a 10-year manufacturer guarantee for Q-Lon. Service life depends on profile selection, installation, use and care. We confirm the applicable product guarantee terms when ordering.
Yes, we come out for a single window too. Describe the problem and we'll agree on a time.
In Tallinn and Harjumaa usually within a few days. Describe the problem and we'll tell you the earliest we can come.
We replace seals on uPVC windows and balcony doors. We inspect the cross-section, fixing and sealing circuits, then select a suitable Q-Lon profile.
Draughts, worn seals or a cold room
Cracks, stiffness and permanent flattening can indicate wear. We locate the leak first: replacing a seal cannot solve every cause of cold or condensation.
A clear price and a checked result
Material and labour are itemised in the quote. After installation, we check contact and closing. We adjust the window where needed and agree other repairs separately.
Buy the seal or book replacement?
We help with both material and replacement of worn seals. Q-Lon material alone is €4.50/m. Replacement including material and labour is €7/m or €10/m for recessed seals; the 50% material discount is already included in that total. Call-out is separate.
Replacement of a non-recessed sealmaterial and labour
€7 / m
Replacement of a seal recessed into the framematerial and labour
€10 / m
Typical guide per sash: non-recessed seals €45-70, recessed seals €70-90. These are not fixed package prices. Example: two 4 m runs = 8 m; 8 × €7 = €56 or 8 × €10 = €80, plus call-out.
The call-out fee is added to labour charges: first visit in Tallinn €35, repeat visit €10. Outside Tallinn, travel is €0.50/km for the total distance travelled; call-out terms are agreed before the visit. We confirm the total before work starts.
