Expert guide to broken window repairs. Learn about glass replacement, emergency boarding, costs, and professional window repair services.
Diagnose Your ProblemBroken windows create urgent security vulnerabilities, weather exposure, and safety hazards from sharp glass edges. Windows break from impacts (balls, rocks, attempted break-ins), severe weather, stress cracks, or accidents. Broken windows require immediate temporary boarding to secure properties, followed by professional glass replacement matching original specifications.
Professional window repair includes emergency boarding within hours, glass measurement and ordering (standard glass same-day, specialty glass 3-5 days), safe removal of broken glass, frame cleaning and preparation, new glass installation with proper sealing, and testing for secure fit and operation. Quality repairs restore security, insulation, and appearance.
Signs of broken or damaged window glass requiring professional attention:
Any broken window should be treated as urgent regardless of size. Even a small hole leaves a property exposed to rain, insects, and intruders - and sharp glass edges pose immediate injury risks to household members.
Windows break from a range of causes, each affecting how the repair is approached:
Impact damage: The most common cause - something hits the glass with sufficient force to break it. Sources include children's sporting activities (balls, sticks), garden debris blown by wind, stones thrown up by lawnmowers, accidental impacts from moving furniture, or deliberate vandalism and attempted break-ins. Safety glass (tempered or laminated) resists impacts better than standard annealed glass and breaks more safely when it does fail.
Thermal stress: Glass expands and contracts with temperature changes. When thermal movement is restricted by a tight frame or the glass is subjected to extreme temperature differences (direct sun on one side, air conditioning inside), stress builds. This is a slow process but eventually causes spontaneous cracking with no apparent impact - particularly common in large panes and south-facing windows in summer.
Frame settlement: As buildings settle, window frames can rack slightly out of square. Glass fitted tightly in a square frame that has become slightly out of square is put under stress. This causes stress cracks, typically running from a corner of the glass diagonally across the pane. More common in newer buildings still settling.
Manufacturing defects: Nickel sulphide inclusions in tempered glass can cause spontaneous shattering months or years after installation. This is uncommon but does occur with tempered glass, particularly in recent years as manufacturing quality has varied.
Failed glazing putty or tape: Over time, glazing putty dries out, cracks, and falls away. Old glazing tape loses its adhesive properties. Without adequate edge support and sealing, glass becomes loose in frames and prone to cracking from vibration and flexing. This is very common in homes over 20-30 years old that haven't had glazing maintenance.
Double-glazed seal failure: Double-glazed units seal two glass panes with a spacer bar and hermetic seal around the perimeter. This seal eventually fails due to age, UV exposure, or water ingress. Seal failure causes the telltale fogging between panes as moisture enters the insulating air gap. The thermal performance of the unit drops dramatically once sealed.
Urgency: HIGH to EMERGENCY - Broken windows should be addressed the same day
Broken windows are among the most urgent home repairs for several overlapping reasons:
Security exposure: Any opening in a window - even a small hole - is a potential entry point. A fully shattered window or large missing section is an open invitation to intruders. Opportunistic burglars are alert to obvious vulnerabilities and act quickly. Leaving a broken window overnight significantly increases burglary risk.
Weather exposure: Rain entering through a broken window can cause extensive damage rapidly. Timber floors, carpets, curtains, walls, and furniture can be damaged in a single rain event. Water damage from a few hours of rain through a broken window can cost R10,000-R40,000 to remediate - far exceeding the window repair cost.
Safety hazard from broken glass: Broken glass remaining in a frame is unstable and dangerous. Shards fall when the window is disturbed by wind, vibration, or accidental touch. Children and pets are at particular risk. Glass injuries from falling shards are serious and painful.
Insurance implications: Most home insurance policies require reasonable steps to prevent further damage after an incident. Leaving a broken window unboarded and documented as such when submitting a claim may reduce or void insurance payout for resulting water or theft damage.
Same-day priorities:
Temporary boarding with plywood or heavy plastic sheeting is always acceptable as a same-day measure while permanent glass replacement is arranged. Don't leave a broken window without some form of temporary protection.
The signs you notice at home can help determine how serious the issue is and how quickly a professional should attend.
This usually indicates:
Stress crack - not urgent but will spread
Urgency: Low
Recommended action:
Schedule replacement within 2-4 weeks before crack spreads
This usually indicates:
Significant damage needing prompt repair
Urgency: Medium
Recommended action:
Temporary covering and schedule repair within 2-3 days
This usually indicates:
Emergency requiring immediate boarding
Urgency: Emergency
Recommended action:
Call emergency glazier immediately for boarding and repair
DIY feasibility: LOW - Emergency boarding is DIY; glass replacement should be professional
Broken windows split clearly into two phases with very different DIY suitability:
Emergency boarding - suitable for DIY: Temporary boarding to secure a broken window until professional repair can happen is a reasonable DIY task. Use plywood cut to cover the window opening and secure it to the outside of the frame using screws or nails. Heavy duty plastic sheeting taped over the outside is a temporary measure. The goal is security and weather protection, not appearance. This DIY step prevents further damage and buys time for proper repair.
Glass replacement - strongly recommended as professional:
Cost comparison:
DIY boarding: R100-R300 for plywood and screws. Risk: Low as a temporary measure.
Professional glass replacement: R800-R3,500 for standard window glass including measurement, glass, and installation. Double-glazed units R2,500-R8,000 depending on size. Time: Same-day or next-day for standard glass. Risk: None with professional installation.
Step 1: Emergency Boarding if Required (15-30 minutes)
If the window is immediately exposed and the glass cannot be replaced same day (awaiting specific glass, access issues, or timing), professionals board up the opening using exterior-grade plywood cut to cover the opening and secured to the frame. Boarding prevents weather and intruder access while permanent repair is arranged. This is often the first service call for after-hours emergencies.
Step 2: Safe Broken Glass Removal (15-30 minutes)
Professionals wear appropriate personal protective equipment (cut-resistant gloves, safety glasses) and systematically remove all broken glass from the frame. They tap unstable glass to bring it down safely rather than leaving dangerous hanging shards. They collect all glass in heavy-duty waste bags for safe disposal. They remove all old glazing putty or tape from the frame rebate down to bare frame material.
Step 3: Measurement and Glass Specification (10-15 minutes)
Professionals measure the opening precisely (length and width at multiple points as frames can be slightly out of square) and deduct standard tolerances to ensure the new glass fits without being too tight. They confirm the correct glass type for the location - tempered for safety-critical locations, standard for non-critical, double-glazed unit for insulated windows. They check whether existing frame can accept a new pane or whether the frame or glazing bar needs repair first.
Step 4: Glass Procurement (Variable)
Standard single-glazed glass is typically cut and available from glaziers within hours. Professionals contact their supplier and collect or arrange delivery. Specialty glass - double-glazed units, specific tints, patterned obscure glass, or extra-large panes - may require 1-5 days for manufacture and delivery.
Step 5: Frame Preparation and Glass Installation (30-60 minutes)
Professionals clean and prime timber frames, treating any areas of rot or moisture damage before glazing. They bed the new glass using appropriate glazing compound or glazing tape, ensuring uniform bed thickness around all edges. They install glass carefully using suction cups, positioning accurately in the frame with correct edge clearance. For putty glazing, they apply fresh glazing putty and form a neat bevel. For dry glazing systems (beads and tape), they fit glazing beads and secure the glass. They ensure glass is held securely and cannot rattle in the frame.
Step 6: Sealing and Finishing (15-20 minutes)
Professionals apply appropriate silicone sealant at the internal perimeter where the frame meets the glass, preventing moisture ingress. They clean excess putty or silicone from the glass. They advise on paint touch-up if putty has been applied (putty needs to cure for at least 2 weeks before painting). They remove all debris and broken glass waste from the site.
Timeline: Emergency boarding 30-60 minutes. Glass replacement for standard windows 60-90 minutes if glass is available. Double-glazed unit replacement 90-120 minutes. Lead time for specialty glass orders 1-5 working days.
Cost expectations: Emergency boarding R400-R800. Single-glazed window replacement R800-R2,500 depending on pane size and glass type. Safety glass (tempered) R1,200-R4,000 for larger panes. Double-glazed unit replacement R2,500-R8,000+ depending on dimensions and specification. Frames in poor condition requiring repair before reglazing add R500-R2,000 depending on extent.
Broken windows left unrepaired cause damage that multiplies quickly:
Water damage from weather exposure: A single night of rain through a broken window can saturate carpets, damage timber floors, soak soft furnishings, wet walls causing plaster damage and mould, and damage electrical fittings. Water damage restoration including drying, carpet replacement, floor repair, and mould treatment costs R10,000-R50,000 for a significant water event - compared to a R1,500 window repair or R500 temporary boarding.
Burglary through the exposed opening: Any window opening at ground or reachable height is a potential entry point. Burglary losses including electronics, jewellery, and other valuables typically total R20,000-R150,000 in a residential burglary. Beyond financial loss, the trauma and security anxiety following a burglary significantly impacts quality of life. Insurance policies may not cover theft where obvious security deficiencies existed.
Injury from unstable glass: Broken glass remaining in a frame can fall at any time - disturbed by wind, vibration from passing traffic, or accidental touch. Children reaching for the frame are at severe risk. Glass cuts are painful and potentially require hospital treatment. Medical costs and potential liability for glass injuries on your property are significant.
Frame deterioration from exposure: Timber frames exposed to rain through a broken window absorb moisture rapidly, beginning to rot at the rebate and sill. Rotted frame sections need replacement before reglazing can occur - adding R500-R2,000 to the repair cost depending on extent. Aluminium frames can also be damaged when their protective coating is compromised by weather exposure.
Pest entry: Even a small window opening allows insects, birds, and rodents to enter the property. Pest infestations resulting from ongoing access are expensive to remediate and can cause secondary damage to insulation, wiring, and stored items.
Insurance and liability: Failing to take reasonable steps to prevent further damage after a window breakage (such as at least boarding it up) can result in insurance claims being reduced or denied for consequential damage. Insurance documents typically require "reasonable care" of the insured property.
Cost comparison scenarios:
No home repair more clearly rewards immediate action than a broken window. The cost of delay escalates from hundreds to tens of thousands of rand within days.
In most cases we replace just the broken glass pane, saving you the expense of a complete window replacement. Only severely damaged frames need full window replacement.
Single pane replacement typically takes 1-2 hours once we have the glass. Measuring and glass ordering may take 1-2 days for standard sizes, longer for specialty glass.
Yes, we provide emergency boarding with plywood or clear polycarbonate to secure your home while waiting for glass. This prevents weather damage and deters break-ins.
Laminated glass holds together when broken preventing injuries, provides better security, reduces noise, and blocks UV rays. It costs more but is recommended for ground floor windows and near doors.
Most home insurance covers accidental breakage and storm damage. We provide detailed invoices and reports to assist with your insurance claim.
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