Window Seal Replacement Cost in 2026: Hampshire Prices

By Restoration Glazing, Chandler's Ford, Eastleigh · Last updated 27 September 2026

At Restoration Glazing in Chandler's Ford, replacing the rubber seals on a uPVC window costs from £40 per window, or roughly £5 to £15 per metre of gasket. Every visit has a £180 minimum charge, so the per-window price applies when we do several windows (or other repairs) in one visit, and a single window on its own comes to £180.

Which window seal needs replacing?

"Window seal" can mean three different things, and only one of them is fixed with new rubber.

Rubber gaskets. The rubber strips around the opening part of the window (the sash) and around the glass. When they shrink back from the corners or go hard, you get draughts, whistling and water on the inside sill. This guide prices these.
The seal inside the glass unit. If the glass has misted up between the panes, the unit's edge seal has failed and it can't be resealed. We replace the sealed unit in your existing frame, from £120 per unit. See our misted glass repair page.
Silicone round the outside of the frame. The bead of mastic between the frame and the brickwork. If yours has cracked or come away, mention it when you get in touch.

How much does it cost to replace window seals in 2026?

Restoration Glazing charges from £40 per window to replace uPVC window seals in Southampton, Eastleigh and across Hampshire, with a £180 minimum charge per visit.

Job	Typical price (fitted)	Typical time on site
Rubber gasket, priced by length	£5–£15 per metre	Depends on length
Window seals, standard casement	From £40 per window	About 15–20 minutes per window
uPVC door seals	£40–£90	Ask us
Sliding patio door bottom seal	£60–£90	Ask us
Misted glass unit (not a rubber seal)	From £120 per unit	Under an hour per window
Minimum charge per visit	£180

In practice, five windows at from £40 each comes to from £200, so the minimum doesn't come into it. One window on its own is £180, so it's worth adding anything else that's been bugging you, like a stiff handle (individual repairs start from £30). Other repair prices are in our double glazing repair cost guide.

Want an exact price? Call 023 8001 2328 or get a free quote online. You can upload a photo on the form.

What changes the price of new window seals?

The price mostly depends on which gasket your frame uses and how it was fitted at the factory.

The gasket profile. Each uPVC system (Veka, Rehau, Liniar, Eurocell, Kömmerling and plenty more) has its own gasket shapes. Common ones are quick to match. Discontinued systems take longer to source.
Push-in or co-extruded. Most gaskets sit in a groove and pull straight out. Co-extruded ones were bonded to the uPVC when the frame was made, so they have to be cut out first.
Which seal has gone. Sash seals usually fail first. Replacing the wedge gaskets that hold the glass means taking the glazing beads out, which is more work.
Access. Awkward or upper-floor windows can add a small surcharge.

What happens when we replace your window seals?

We check the seal really is the problem, then match, fit and test the new gasket, normally in one visit.

We close the window on a sheet of paper. If it pulls out easily, the sash isn't pressing on the gasket, and sometimes that's an adjustment rather than new rubber.
We identify your frame system and match the gasket.
The old gasket comes out and the channel gets cleaned.
The new gasket goes in, pushed tight into the corners, where old rubber tends to shrink back.
We check compression with the handle shut, adjust the locking cams if needed and repeat the paper test.

How long does window seal replacement take?

A standard window takes about 15 to 20 minutes to re-seal, and a house with 10 to 15 windows is usually done in around half a day. Co-extruded gaskets, glazing gaskets and doors take longer.

When is replacing window seals not worth it?

New rubber won't help if the draught or leak is coming from somewhere else, and sometimes the fix is free.

The window has dropped. A sash that has sagged on its hinges (friction stays) won't close evenly onto any gasket. New hinges fix that: see our window hinge replacement cost guide.
The cams need tightening. Most espagnolette windows have small round cams along the opening edge of the sash. Turning them pulls the sash tighter against the seal. Try it before paying anyone.
There's water on the inside sill. Check the drainage slots along the bottom of the outer frame. If they're blocked, water backs up. A bit of wire usually clears them.
There's mist between the panes. That's the glass unit, and new gaskets won't clear it.
The frame is warped or worn out. On an old window with several faults at once, new gaskets are money wasted. Our uPVC repair vs replacement guide explains where that line sits.

Not sure which it is? Upload a photo on the quote form or call 023 8001 2328 and tell us what's happening.

What should you send us for a fast quote?

A photo, a line about the problem and your postcode are enough to start pricing a seal job.

A photo of the whole window or door, plus a close-up of the seal where the draught or leak is
What's happening: draught, whistling, water on the sill, or mist between the panes
How many windows, rough sizes if you know them, and your postcode

Our rubber seal quote form has a photo upload. It asks for metres of seal; if you're not sure, an average opening sash has roughly 3 to 5 metres around it. You can also email photos to enquiries@restorationglazing.com.

Which areas do you cover for window seal replacement?

Restoration Glazing replaces window and door seals across Southampton, Eastleigh, Chandler's Ford, Winchester, Romsey and the rest of Hampshire, plus Salisbury, Basingstoke and Guildford, from our base at Unit 28 Monks Brook Industrial Park, School Close, Chandler's Ford, Eastleigh SO53 4RA.

We've been trading since 2020 (Restoration Services & Glazing Ltd, company 14354307, incorporated 2022), and we're FENSA registered (44665). More on the service itself is on our rubber seal repair page.

What else do people ask about window seals?

How much does it cost to replace window seals?

At Restoration Glazing, uPVC window seals cost from £40 per window, or about £5–£15 per metre of gasket. There's a £180 minimum charge per visit, so it's best value when several windows are done together.

Can I replace uPVC window seals myself?

You can if you match the profile exactly, and push-in sash gaskets are the easiest to do. The hard part is finding the right gasket for your frame system. The wrong one won't seat or won't compress, and the draught stays.

How long do rubber window seals last?

Usually 10 to 15 years. Windows that get full sun tend to go first, because UV hardens and shrinks the rubber faster.

Will new seals fix condensation between the panes?

No. Mist between the panes means the sealed glass unit has failed, and new rubber won't clear it. The fix is a new sealed unit in your existing frame, from £120 per unit, with the same £180 minimum charge per visit.

Do I need to replace every seal at once?

No. We only replace the seals that have failed. Because of the £180 minimum, though, it usually makes sense to do the worst few windows in the same visit.

How do I book window seal replacement?

Call Restoration Glazing on 023 8001 2328, Monday to Friday, 8:30am to 5pm, or get a free quote online and upload a photo of the window. You can also email enquiries@restorationglazing.com.