Cost of Replacing a Double Glazed Unit: 2026 UK Price Guide

This guide covers honest, up-to-date prices for made-to-measure replacement sealed units across the UK, so you know exactly what to expect before you pick up the phone.

Average Cost of Replacing a Double Glazed Unit

The cost of a replacement double glazed unit typically ranges from £60 to £300 for the supplied unit, depending on the size of the pane and a few other factors covered below. Here’s a rough price guide based on unit size:

These figures are for the supplied, made-to-measure unit itself in standard clear double glazing. Specialist glass — such as frosted, toughened, or triple glazed — will cost more. If you’re using your own glazier to fit it, their labour is separate; ask them for a fitting price before you order.

Factors That Affect the Price

Several things influence how much you’ll pay for a replacement double glazed unit:

Glass type. Standard float glass is the cheapest option. Toughened safety glass (required in doors, low-level windows, and certain bathroom applications) adds cost. Laminated, self-cleaning, or low-emissivity (Low-E) glass all carry a premium, though Low-E glass can reduce heat loss and save on energy bills over time.

Unit size. Larger panes require more glass and are heavier to handle. Bay windows, feature windows, and large fixed-light panels sit at the top end of the price range.

Glass thickness and spacer. The overall thickness of the unit and the spacer bar depth are made to match your existing frame’s rebate. Getting these right is what makes the replacement a like-for-like fit, so it helps to confirm them when you order.

Quantity. If you have several failed units, ordering them together is usually more economical than one at a time.

Collection or delivery. Units can be collected from our Bramley premises at no extra cost, or we can arrange delivery — ask for a delivery price when you order.

The Unit vs the Whole Window

A question worth asking honestly: do you need a new unit, or a whole new window?

A replacement sealed unit is usually all you need if:

• The frame is in good condition — no rot, no warping, no failed seals between frame sections
• The problem is isolated to the glass (misting, crack, or chip)
• The frame was installed within the last 15–20 years

You may need a whole new window if:

• The frame has visible rot, significant warping, or major seal failure
• Draughts are coming from the frame itself, not the glass
• You’re upgrading to a different style or energy rating and want a consistent finish
• Multiple windows in the property are failing — new frames and units together may work out more cost-effective

At PTF Glass we’ll always give you honest advice. If a new sealed unit will solve the problem, that’s what we’ll tell you — we make and supply the glass, so there’s no incentive to push you toward a full window you don’t need.

Signs Your Double Glazed Unit Needs Replacing

Not sure if it’s time to act? These are the clearest warning signs:

Misting or condensation between the panes. This is the most common indicator of a failed seal. Once the argon gas or air cavity is compromised, moisture gets in and you can’t clean it away from the inside. The unit needs replacing. For more on this, see our guide to condensation in double glazed windows.

Cracked or chipped glass. A crack — even a small one — reduces the structural integrity of the unit and breaks the insulating seal. It won’t improve on its own.

Draughts around the glass. If cold air is coming through the glazed area rather than the frame, the unit’s edge seal has broken down.

Noticeably cold panes. If one window feels significantly colder than others in the room, the unit’s insulating performance has dropped — often due to gas leakage or seal failure.

Visible damage or discolouration. Chips, scratches, or yellowing that can’t be removed from the surface may warrant replacement, particularly if they’re affecting visibility or appearance.

PTF Glass Pricing & What’s Included

When you order a replacement unit from PTF Glass, here’s what’s included as standard:

• Made to measure: Each unit is manufactured to the exact sizes you provide. We’re happy to explain how to measure accurately so the new unit fits first time.
• Like-for-like specification: Your new unit matches the original — same glass type, same spacer bar, same overall thickness — so it drops straight into your existing frame.
• Collection or delivery: Collect from our Bramley premises (LS13 4EN) at no extra cost, or ask about delivery.
• Guarantee: Every unit carries the Eurocell 10-year manufacturer guarantee plus PTF Glass’s own 5-year guarantee against sealed-unit failure.
• No hidden costs: The price you’re quoted for the unit is the price you pay.

We work across Leeds and the surrounding area and typically turn around made-to-measure units within a week or two.

Frequently Asked Questions

Get a Price for Your Replacement Unit

If your double glazed unit is showing any of the signs above, the next step is a price for a made-to-measure replacement. PTF Glass will give you a clear figure with no pressure and no hidden extras. We serve Leeds and West Yorkshire including Morley, Rothwell, Armley, Headingley, Roundhay, Horsforth, Pudsey and Bramley, plus Wetherby, Wakefield, Castleford and Pontefract.

Get a price for your replacement unit
Call 0113 236 1203

Also useful before you order:

• Condensation between double glazed windows — what’s causing it and how to fix it
• Double glazing wet inside — what it means and what to do
• Misted unit replacement near me — where PTF Glass supplies