Skip to main content
Local Bristol Glaziers
4.4/5 from 39 Google reviews

Door Glass Replacement

Stop losing heat and money. FENSA registered experts fix your windows fast - with a 10-year guarantee.

Get Free Quote Now

Why Bristol Chooses Us

Expert Glazing, Done Right

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

FENSA Registered

Member of FENSA — the government-authorised Competent Person Scheme for replacement glazing. Every install self-certified to Building Regs Approved Document L; no separate building-control notification needed.

BS EN 1279 Certified

Every sealed unit ships with a UKCA mark and a Declaration of Performance compliant with BS EN 1279 parts 1, 2, 3, 5, and 6 — the European insulating glass standards covering gas fill, durability, and structural integrity.

10-Year Warranty

10-year guarantee on every sealed unit, on our fitting work and on coatings (Low-E, self-cleaning, solar). It covers the original buyer and doesn't transfer to a new owner. We replace failed units without quibble within the guarantee period.

South-West Specialists

We fit and repair across Bristol, Bath, North Somerset and South Gloucestershire, plus Gloucester and towns in Wiltshire and Somerset. Emergency response within 24 hours. No national call-centre handoffs.

Honest Online Pricing

Configurator returns a real price for your exact spec — no "ring for quote" runaround. Trade accounts unlock tier pricing live, with discounts from 5 units.

Trade-Account Ready

Volume discounts of 5% at 5+ units, 10% at 20+ and 15% at 50+, bulk dispatch on schedule, trade enquiries Monday to Friday 9am–5pm. Apply at our trade page.

Warning Signs

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

Understanding Double Glazing Problems

Double glazing works by trapping a layer of air or gas between two panes of glass, creating an insulating barrier that keeps heat in and cold out. When this seal fails, moisture enters the gap and the insulating properties are compromised.

Why Do Sealed Units Fail?

The average lifespan of a sealed unit is 15-25 years, though this varies based on quality, installation, and exposure. The main causes of failure include:

  • Age and weathering - The seal naturally degrades over time, especially on south-facing windows exposed to more UV radiation
  • Poor original installation - If drainage channels are blocked or the unit was fitted incorrectly, water can pool and accelerate seal failure
  • Temperature fluctuations - Repeated expansion and contraction stresses the seal, particularly in conservatories
  • Physical damage - Even minor impacts can compromise the edge seal without cracking the glass

Repair vs Replace: Making the Right Choice

Many homeowners assume failed double glazing means replacing the whole window. This is rarely necessary. If your frames are structurally sound and not warped or damaged, replacing just the sealed unit is the sensible choice.

However, if your frames are over 20 years old, showing signs of rot (timber) or becoming brittle (early UPVC), full replacement may be more economical long-term. We will explain your options clearly so you can make an informed decision.

The good news: in most cases, only the glass unit needs replacing - not the entire frame. This typically saves 50-70% compared to full window replacement.

Simple Process

How Our Service Works

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

Tell us what you need

Call the helpline, fill the quote form on this page, or use the online configurator for instant pricing. We need: rough location, glazing problem or spec, and any photos you have of the issue or frame.

Free survey or remote spec

For most jobs we book a free no-obligation survey within 2 working days. For straightforward like-for-like replacements we can spec from photos + rebate measurements — no visit needed.

Fixed-price quote within 24 hours

You get a fixed price for the work — labour, materials, units, disposal, and FENSA certification — in writing. No surprise add-ons on the day. Trade accounts see tier pricing live in the configurator.

Manufacture to spec

Units are made to spec by our partner factory. Standard double-glazed units are made and dispatched in 5–7 working days; triple, toughened and laminated units in 10–14. Fitting is usually within 5 working days of the survey, scheduled around your build programme.

Install + sign-off

Single-visit install in most cases. We FENSA-certify the work to Building Regs Approved Document L and post your certificate within 30 days. 10-year warranty active from install date.

Our Services

What We Can Help With

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

Sealed Unit Replacement

Like-for-like swap of any failed (misted, blown, cracked) IGU. We measure, manufacture to spec, and refit — usually in a single visit. Frame stays, glass changes.

Full Window Replacement

When frames are rotten, twisted, or beyond viable repair, we install complete window units — PVCu, aluminium, or timber. FENSA-certificated; Document L compliant; A-rated glazing standard.

Safety & Security Glazing

Toughened (BS EN 12150) or laminated (BS EN 14449) units for critical locations — French doors, low-level windows, bathrooms, balustrades. Anti-bandit P-rated (BS EN 356) available for security-priority installs.

A-Rated Energy Upgrade

Replace 1990s air-filled units with 28mm Low-E argon (U=1.1 W/m²K, WER A). Typical EPC uplift 5-12 points; lower heat-pump flow-temp requirements; immediate winter comfort win.

Trade & Bulk Supply

Supply-only sealed units (any spec, any size) for builders, glaziers, and installers. Volume discounts from 5 units, scheduled site delivery. Apply for a trade account.

Emergency Glass Repair

Broken or fall-out-risk glazing made safe within 24 hours across our Bristol fitting area, typically £150–£400 with no call-out fee. Toughened or laminated replacement to original spec; insurance-claim documentation provided.

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
  • ★★★★★
    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

  • ★★★★★
    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

  • ★★★★★
    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

Common Questions

Frequently Asked Questions

Answers to the questions we're asked most.

  • No — not in any reliable, durable way. "Defogging" services that drill the glass and inject desiccant void manufacturer warranties, never restore the argon fill, and the U-value stays degraded. The cost-effective fix is replacement of the IGU; the frame stays in place.

  • UK industry average is 15-25 years before edge-seal failure causes misting. Modern warm-edge spacers with butyl + polysulphide secondary seal commonly last 20-30 years. Our guarantee covers sealed units for 10 years.

  • Replacement glazing in an existing frame is FENSA-self-certifiable — no separate Building Control notification required when fitted by a FENSA-registered installer (us). New windows in significant extensions or new builds need building control sign-off on Part L (energy) and Part N (safety glazing) compliance.

  • Standard double-glazed units: 5–7 working days to make and dispatch. Triple-glazed, toughened or laminated: 10–14 working days. Fitting is usually within 5 working days of the survey. For broken glass or a break-in, we respond within 24 hours.

  • Toughened (BS EN 12150) is the default safety spec in walls and doors at critical locations under Approved Document N — granular break, low laceration risk. Laminated (BS EN 14449) is required for overhead glazing (BS 5516), balustrades, and security applications — the PVB interlayer holds fragments in place. Most residential critical locations are toughened; conservatory roofs are laminated.

  • Yes — typical savings on UK 3-bed homes upgrading from first-generation DG to 28mm Low-E argon (U=1.1 W/m²K) are £80-180/year depending on heating fuel and exposure. Larger savings on cold-climate orientations (north-facing, exposed). The energy calculator gives a per-home estimate.

  • Yes. Builders, glaziers, FENSA fitters, and developers can apply for a trade account at our trade page. Trade discounts are 5% at 5+ units, 10% at 20+ and 15% at 50+, with scheduled bulk delivery. We don't offer 30-day credit terms. Apply via sales@panerelief.co.uk.

  • Photograph the unit, edge-stamp, and any visible defect; email info@panerelief.co.uk with your order reference. Failures within the 10-year guarantee (original buyer only) get priority replacement. We don't charge for in-warranty replacement units; site re-fit is a separate quote.

Explore More

Related Services

We offer a complete range of glazing services across Bristol. See how else we can help.

Misty Windows

Sealed units fogging or condensating between the panes? See the misty-windows service page for diagnosis, replacement options, and warranty cover.

Learn more

Failed Seals

Edge-seal failure is the most common reason a sealed unit needs replacing. Read the failed-seals guide for what to look for and how it gets fixed.

Learn more

Safety & Security Glass

Toughened, laminated, and anti-bandit P-rated glass — what each is for, what Building Regs require where, and how to pick the right spec.

Learn more

Energy-Rated Glass Units

A-rated low-E units, U-value math, BFRC ratings, and how to upgrade from 1990s air-filled glazing to a Building Regs Part L-compliant spec.

Learn more

Acoustic Glass Solutions

Live near a road, railway, or flight path? Asymmetric panes + laminated PVB interlayer can drop external noise by up to 44 dB Rw. Spec guide and decision tree.

Learn more

Conservatory Reglazing

Conservatory roof and side-panel replacement — solar-control, self-cleaning, and laminated overhead options. Standard units dispatched in 5–7 working days.

Learn more

Ready to Get Started?

Get your free, no-obligation quote today. Most quotes delivered within 24 hours.

Request Free Quote Call 0117 330 3057

Prefer to talk? Call us on 0117 330 3057