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Safety Glass Standard
4.4/5 from 39 Google reviews

Composite Doors

Replacement sealed units for composite door glazing. Composite doors use toughened or laminated safety glass in a wide range of panel configurations — full-length, half-panel, quarter-light, sidelights, and fanlights. We supply exact-size replacement units for every composite door style, with safety glass compliance as standard.
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FENSA Registered
BS EN 1279 Certified
UK Mainland Delivery
5–7 Day Dispatch
Rated on Google
Trade Pricing Available

Rockdoor, Solidor, Endurance, Doorco, Composite Door Group, Apeer — we supply replacement glass for all major composite door manufacturers.

Expert Glazing, Done Right

We're not a national call centre. We're local glaziers who take pride in every job.

Safety Glass Standard

Every composite door unit is manufactured with toughened or laminated safety glass to BS EN 12600. It's not an optional extra — it's built into every quote. Class 1 impact rated as standard.

Decorative Options

Composite doors often feature decorative glass — bevels, fused glass clusters, leaded designs, and coloured panels. We can match most popular patterns or supply clear/obscure as a simpler alternative.

Cassette vs Direct Glazed

Most composite doors use a cassette system — the glass is mounted in a removable frame that clips into the door. Measure the cassette, not the door. Direct-glazed doors require edge-to-edge unit measurement.

10–14 Working Days

Composite door glass is toughened, so units are made and dispatched in 10–14 working days.

10-Year Warranty

Full warranty on seal integrity and safety compliance. Every unit kitemarked.

Composite doors have specific glazing requirements that differ from window glass. Check these before ordering.

Signs Your Double Glazing Needs Attention

Catching problems early saves money and prevents bigger issues. Here are the telltale signs your windows need professional attention.

Misting Between Panes

Visible fogging or condensation inside the sealed cavity (not on the room-side surface) means the edge seal has failed and moisture has entered. The argon gas is also gone — the unit's U-value has dropped from 1.4 to ~2.8 W/m²K. Replace, don't repair.

Cold Drafts Near Windows

Cold zones near a closed window usually mean a failed perimeter seal between glass and frame, or a degraded gasket. Easy to fix on most frames without replacing the glass — but worth a survey to confirm it's not also an IGU failure.

Sudden Spike in Heating Bills

If your bill jumped without weather or tariff changes, check whether sealed units have failed. A single misted unit on a 4-bed home typically adds £100-200/year to heating cost via lost insulation.

Visible Cracks or Chips

Even hairline edge cracks let moisture in and trigger seal failure within months. Cracks in safety-glazing locations (low-level, doors, bathrooms) are a Building Regs Document N compliance issue — replace promptly with BS EN 12150 toughened equivalent.

Heavy Room-Side Condensation

Streams of water on the inside of the glass on cold mornings usually mean the room-side glass surface is too cold (poor U-value glazing) combined with high indoor humidity. A-rated low-E units (U=1.1) typically eliminate this; the condensation calculator identifies the cause.

Sticky or Misaligned Sashes

Sashes that catch, jam, or won't lock are usually hinges, friction stays, or sash weights that have worn — often fixable without replacing the glass. But check the frame for rot or PVCu reinforcement failure while diagnosing; bad frames need replacement before glass.

⚠️ Noticed any of these issues? Do not wait - small problems become expensive repairs. Get a free assessment today.

Expert Knowledge

Composite Door Glazing: Specification Guide

Composite Door Construction

Modern composite doors have a solid timber core or foam core with GRP (glass-reinforced plastic) skins. The glass panels sit in cassettes — removable frames that clip or screw into apertures in the door slab. This makes glass replacement relatively straightforward: remove the cassette, swap the glass, refit the cassette.

Safety Glass Requirements

BS EN 12600 defines three impact classes. For domestic doors:

Class 1 (toughened) — Shatters into small granular pieces on impact. The most common choice for composite doors.
Class 2 (laminated) — Cracks but holds together on the interlayer. Better security (intruder can't easily reach through). Better acoustic performance. Premium option.
Class 1+2 (toughened-laminated) — Maximum security. Both toughened and laminated properties. Used in high-security doors and commercial applications.

Decorative Glass Options

Composite doors are a style statement — the glass is often the centrepiece. Common decorative options include:

Bevelled clusters — Geometric patterns of bevelled glass pieces fused onto a clear or obscure base. The most popular decorative style. Available in hundreds of designs.
Leaded glass — Lead came strips in traditional patterns. Available as genuine leaded or applied lead strip (cheaper, lighter, similar visual).
Coloured glass — Coloured film or fused glass elements for accent panels. Popular in contemporary door designs.
Etched / sandblasted — Patterns etched or sandblasted onto the glass surface for a frosted decorative effect.

Sidelight and Fanlight Panels

Many composite door installations include matching sidelights (vertical panels beside the door) and fanlights (horizontal panels above). These use the same cassette system and can be replaced independently. If replacing a broken sidelight, match the glass type and pattern to the door panel for visual consistency.

Composite door glass replacement has more variables than window glass — decorative patterns, cassette types, obscure levels, letterbox positions. Take detailed photos of the cassette (both sides), the decorative pattern, and any identifying labels on the door. This saves phone calls, prevents ordering errors, and speeds up the quote. One clear photo is worth ten minutes of description.

Measure the cassette, identify the glass type, order with confidence. We handle the safety compliance automatically.

How Our Service Works

From first contact to finished job, we make the whole process straightforward and stress-free.

Remove and Measure the Cassette

Pop the cassette out of the door. Measure the glass rebate inside the cassette. Note the gasket type and any decorative elements. Photograph both sides.

Identify the Glass Type

Clear, obscure, or decorative? If decorative, photograph the pattern and note any manufacturer markings. Tell us the door brand if known — it helps us match the pattern.

Order

Send us the cassette measurements and photos. We confirm specification, safety glass type, and pricing. Trade discounts from 5 units.

Refit the Cassette

New unit arrives in 10–14 working days. Remove old glass from cassette, fit new unit with correct gaskets, clip cassette back into door. Job done — typically 20-30 minutes.
From simple toughened replacements to decorative feature panels — every composite door glass configuration available to order.

What We Can Help With

From quick repairs to complete replacements, we handle all residential and commercial glazing needs.

Toughened Safety Glass

Clear or obscure toughened glass to BS EN 12600 Class 1. The standard safety option for most composite door replacements. All sizes manufactured to order.

Laminated Security Glass

PVB laminated safety glass for enhanced security. Holds together on impact — intruder can't reach through. Better acoustic performance than toughened.

Decorative Feature Glass

Bevelled clusters, leaded designs, etched patterns, and coloured glass. We match most popular composite door patterns or create custom designs.

Triple Glazed Door Panels

Premium triple glazed door units for maximum security and thermal performance. 36-44mm configurations for Solidor, Endurance, and similar premium doors.

Sidelights & Fanlights

Matching glass panels for door sidelights and fanlights. Same decorative pattern, same glass specification — visual consistency across the whole door set.

Letterbox Aperture Units

Sealed units with precision letterbox cutouts. Provide the cutout dimensions and position — we supply the unit with the aperture built in.

Not sure what you need? No problem - we will assess and advise. No obligation, no pressure.

Trusted by Tradespeople & Homeowners

What Our Customers Say

4.4 ★ from 39 Google reviews

  • 25+

    Years in Business

  • 10,000+

    Sealed Units Supplied

  • 39

    Google reviews

  • ★★★★★
    I initially contact Pane Relief to quote for replacing my doors & windows and a conservatory conversion. The quote Ollie gave was comprehensive and honest (I’d had several far higher quotes with “70’s” tactics of stating an exorbitant fee, making a fake call to ‘head office’, then offering a 70% reduction ‘just for me’ - it was a relief not to have to sit through t...

    Sarah Langmead

  • ★★★★★
    I found Ollie online having seen his vans around town. He and his young team have been to the house a few times to remedy issues with old double glazing units and also installed a velux style roof window in our bathroom................ I gotta say, they are very busy and one should try and book in advance, but well worth the wait imo. Great work ethic, a can do att...

    Jolyon Maud

  • ★★★★★
    Ollie and his team have done a lovely job on our home. Totally transformed the place and helped our vision come true! Would totally recommend. Thanks again

    Ashley

Common questions about replacing glass in composite doors.

Frequently Asked Questions

Answers to the questions we're asked most.

  • Yes. Building Regulations (Approved Document K) require all glazing in doors and within 300mm of a door to be safety glass to BS EN 12600. We only supply safety-rated glass for composite doors — toughened (Class 1), laminated (Class 2), or toughened-laminated (Class 1+2).

  • In most cases, yes. Send us a photo of the existing pattern and we'll identify it. We stock tooling for hundreds of popular bevelled, leaded, and etched designs. If the exact pattern is discontinued, we'll recommend the closest match and send you a preview before manufacturing.

  • Most cassettes are held in by clips or a small number of screws accessible from the inside face of the door. Release the clips or remove the screws, and the cassette pops out as a complete unit. If it's sealed with mastic, carefully cut the mastic line with a sharp knife first.

  • If the cassette and door aperture are deep enough (typically 36mm+), yes. Many premium composite doors (Solidor, Endurance, Apeer) are designed for triple glazed panels. Check the cassette depth before ordering — we'll confirm compatibility.

  • We supply sealed units with precision letterbox apertures. Provide the cutout width, height, and position (distance from each edge). The aperture is cut during manufacture and the edges are sealed — no site cutting needed.

  • 5-7 working days for decorative and pattern-matched glass. Clear and obscure toughened panels can be faster. Emergency replacements available for broken door glass — call our trade team to discuss.

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Order Composite Door Glass

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