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Glass Repair

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Glass repair in the sense people mean it is not repair at all. A cracked or shattered pane is taken out and a new one goes in; there is no filling a crack in architectural glass. What varies is how much comes out with it — a single pane from a timber sash, one leaf of a sealed unit, or the whole unit — and who is responsible for paying.

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The responsibility question is the one that causes the most argument, and it depends on how you occupy the property. An owner-occupier deals with their insurer or their own pocket. A tenant on a short lease sits inside a statutory repairing regime that covers the structure and exterior of the dwelling. A leaseholder in a block is governed by the lease. These give genuinely different answers to the same broken window.

The technical question is narrower but easier to get wrong. Replacing glass in an existing frame is exempt from the energy efficiency requirements, which leads some people to conclude that nothing applies at all. The safety glazing rules do apply, and a critical location needs a classified pane whatever the reason the old one broke. Misted or failed sealed units are a different job, covered in our window glass replacement guide.

The first hour: making the opening safe

  • Keep people and pets out of the room until the loose glass is down, since fragments hanging in a frame fall without warning as the frame flexes.
  • Photograph the damage before anything is touched, because an insurer and a landlord will both want to see the original state.
  • Do not pull shards out of a frame by hand — a broken pane still held in its beading is under stress and releases unpredictably.
  • Board or sheet the opening rather than taping the crack, as tape holds fragments briefly and gives a false sense that the pane is stable.
  • If the break is at height or over a pavement or shared access, clear the area below first, because falling glass is the greater hazard.
  • Call the police if the breakage looks like attempted entry and get a crime reference number, which most insurers will ask for.
  • Tell your insurer or landlord the same day, even if you intend to arrange the work yourself, since late notification is a common reason for a claim to be reduced.

Who is liable: owner, tenant or leaseholder

For renters, the starting point is section 11 of the Landlord and Tenant Act 1985, which requires the landlord to keep in repair the structure and exterior of the dwelling-house, including drains, gutters and external pipes. Section 13 limits this regime to short leases, meaning leases granted for a term of less than seven years. Note what the provision says and does not say: it lists drains, gutters and external pipes expressly, and does not name windows.

That omission is why tenancy disputes about glass are so common, and why the tenancy agreement matters as much as the statute. In practice the distinction most agreements and most landlords draw is between deterioration and damage: a rotten frame or a failed unit falls to the landlord as part of keeping the property in repair, while a pane broken by the tenant or their visitors is treated as damage the tenant caused. Where the break was caused by a third party — vandalism or an attempted break-in — check the agreement and report it to the landlord promptly rather than arranging work unilaterally.

Leaseholders in a block are governed by the lease rather than by the statute, and leases vary. Some treat windows as part of the demised premises, making them the leaseholder's responsibility; others treat them as part of the structure maintained by the freeholder and recovered through the service charge. Read the demise and the repairing covenants before instructing anyone, because paying for work that the freeholder was obliged to do is rarely recoverable afterwards.

What has to go back in: the energy rules do not apply, the safety rules do

Approved Document L defines a controlled fitting as the entire unit of a window, roof window, rooflight or door including the frame, and it states that replacing glazing, or a window or door in its existing frame, is not providing a controlled fitting and does not need to meet the energy efficiency requirements. Our window glass replacement guide deals with what that distinction means for sealed units and certificates.

Safety glazing is a separate requirement and is not switched off by that exemption. If the broken pane is in a critical location under Approved Document K, the replacement has to be dealt with under requirement K4, which is satisfied by glazing that breaks safely, is robust, is in small panes, or is permanently protected by a screen. Where the safe-breakage route is used, the glazing must satisfy Class 3 of BS EN 12600 or Class C of BS 6206, or Class 2 of BS EN 12600 or Class B of BS 6206 where it is in a door or a door side panel with a pane width exceeding 900mm.

The practical risk is the temporary pane that becomes permanent. Plain annealed glass is cheaper and quicker to source, and an emergency glazier under pressure on a Saturday evening may fit it into a door or a low-level panel with every intention of coming back. If it stays, a critical location has been left with glass that would not satisfy K4. Ask on the day what is being fitted, get the class on the invoice, and diarise the return visit if the first pane is a stopgap.

What kind of break you have, and what it implies

  • Impact break from outside, with a clear point of impact and radiating cracks, which is the classic vandalism or stray-ball case and usually an insurance matter.
  • Impact break from inside, which changes the conversation with a landlord or insurer considerably.
  • Attempted forced entry, where the frame, beading and locking points need checking as well as the glass.
  • Edge or corner crack with no impact point, often thermal or caused by the pane being pinched in a frame that has moved.
  • Shattered toughened glass that has gone entirely to small fragments, which tells you the pane was toughened and that something disturbed an edge or an inclusion.
  • A crack across a leaded or stained-glass panel, which is a specialist repair rather than a reglazing job and often genuinely repairable.
  • Cracked glass in a fire door or a flat entrance door, which is not a general glazing job and needs the door's fire performance considered.
  • Moisture between two panes with no crack at all, which is a failed sealed unit rather than broken glass.

How a pane is replaced, and what a good glazier confirms first

The glazier measures the sight size and the rebate, records the frame type and the glazing method, and establishes whether the pane is single glass or a sealed unit before ordering. On a modern uPVC or aluminium frame the beads come off, the failed pane lifts out on its packers and the new one goes back on new packers with the beads reinstated. On a timber sash, old putty is raked out, the sprigs removed, and the pane bedded and re-puttied, which then needs to cure before it can be painted — a detail worth knowing because the job is not finished when the glazier leaves.

Before ordering, three things should be confirmed with you. Whether the position is a critical location under Approved Document K, and therefore what class the pane must satisfy. Whether the original was toughened or laminated, since toughened cannot be cut to size on site and has to be ordered, while laminated can sometimes be worked. And whether any coating, tint or obscure pattern on the original needs matching, which affects both lead time and appearance.

Expect a temporary board for anything non-stock. Toughened and laminated panes, anything oversized, and anything with a coating or an obscure pattern are made to order, and a same-day permanent fix is usually only possible with plain stock glass. A glazier who promises an immediate permanent replacement for a critical location pane is either carrying a very unusual van stock or intending to fit something that does not meet the standard.

Handling broken glass, and why boarding is a job in itself

The injuries from broken glazing happen during clear-up far more often than during the break. Fragments travel further than people expect, work into carpet and into the gaps between floorboards, and stay there until someone kneels on them weeks later. Heavy gloves, closed footwear, a dustpan kept for the purpose and a vacuum with a disposable bag are the minimum, and soft furnishings near the break usually need lifting and shaking outdoors rather than vacuuming in place.

Boarding an opening is not simply nailing a sheet over it. It has to hold in wind, it has to not damage the frame that will be reglazed, and on a ground-floor opening it is the only security the property has until the pane arrives. On an upper floor it also has to be installed by someone working at height safely — the Health and Safety Executive's position is that where an employer or a person controlling work at height is involved, the Work at Height Regulations 2005 apply, and the work must be properly planned, supervised and carried out by competent people after the risks have been assessed.

Two situations warrant stopping and getting advice rather than proceeding. Glass in a fire door or in a flat entrance door is part of the building's fire strategy and should not be reglazed on a like-for-like guess. And on a period property, old glass — crown, cylinder or early drawn glass with its characteristic distortion — is frequently irreplaceable and sometimes salvageable in part, so a specialist is worth a phone call before the remains go in a skip.

Glass Repair: frequently asked questions

Can cracked window glass be repaired rather than replaced?

In architectural glazing, no. A cracked pane is removed and a new one fitted; there is no filling or bonding that restores it. The exceptions are decorative — leaded lights and stained glass can genuinely be repaired panel by panel by a specialist, and period glass is sometimes partly salvageable.

Is my landlord responsible for a broken window?

It depends on the cause and on the agreement. Section 11 of the Landlord and Tenant Act 1985 requires landlords to keep in repair the structure and exterior of the dwelling-house, including drains, gutters and external pipes, for leases granted for a term of less than seven years — but it does not name windows. In practice deterioration falls to the landlord and damage caused by the tenant does not, so check the tenancy agreement and report it promptly.

Do I need building regulations approval to replace broken glass?

Not for the energy rules. Approved Document L states that replacing glazing, or a window or door in its existing frame, is not providing a controlled fitting and does not need to meet the energy efficiency requirements. The safety glazing rules in Approved Document K still apply to the replacement pane if it is in a critical location.

The emergency glazier fitted plain glass in my back door. Is that a problem?

It can be. Glazing in a door is a critical location, where Approved Document K expects Class 3 of BS EN 12600 or Class C of BS 6206, or Class 2 or Class B for a pane wider than 900mm in a door or side panel. Plain annealed glass is a legitimate stopgap while a classified pane is made, but it should not be left in place.

How quickly can a broken pane be permanently replaced?

Plain stock glass can often be done the same day. Toughened glass cannot be cut on site and has to be ordered, and anything laminated, coated, tinted, patterned or oversized is made to order. Expect a board over the opening in the meantime for most critical-location panes.

There is condensation between the panes but no crack. Is that glass repair?

No, that is a failed sealed unit rather than broken glass, and the usual answer is to replace the unit while keeping the frame. Our window glass replacement guide covers how units fail, how they are measured and swapped, and what guarantees to expect.

Sources

  1. Landlord and Tenant Act 1985, section 11
  2. Approved Document K: Protection from falling, collision and impact
  3. Approved Document L, Conservation of fuel and power, Volume 1: Dwellings
  4. HSE: Work at height — the law

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

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What affects the cost of glass repair

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Number, size and style of windows or doors
  • Frame material and glass options
  • Full-frame replacement or insert
  • Repairs to rotted framing or sills
  • Interior and exterior trim and capping
  • Access, including upper floors

How to compare glaziers before you hire

  • Look for an installer who measures on site and explains how the new window or door will be sealed and flashed.
  • Ask whether the quote is for a full-frame replacement or an insert, and why they recommend it.
  • Compare quotes on the same product type, glass options, installation method and interior and exterior trim.
  • Ask who handles warranty issues: the installer, the manufacturer or both.
  • For garage doors, choose a technician trained on springs and openers, since that work can be dangerous.

Questions to ask glaziers before you hire

  • Will you replace the full frame or install an insert, and what's the difference for my home?
  • How will you insulate and seal around the new units?
  • Is interior and exterior trim included in the price?
  • What does the manufacturer's warranty cover, and what does your installation warranty cover?
  • How long will it take for the products to arrive once I order?
  • Will your own crew do the installation?

When to call a pro for glass repair

  • Drafts, condensation or fog between the panes
  • Windows or doors that stick, won't lock or let water in
  • A garage door that's off track or has a broken spring: don't try to force it, and call a garage door technician.

Glass repair permits and local rules

Some glass repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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