A single annual window-care round costs roughly £40–£80 in materials, compared with £200–£600 for one emergency repair call-out.
Neglecting window maintenance is a gamble that rarely pays off. A single emergency call-out for a broken hinge, a failed lock, or a cracked seal typically costs between £200 and £600, depending on your location and the time of day (Checkatrade, 2026). In contrast, a full annual window-care round using basic cleaning and lubrication materials costs roughly £40 to £80.
An annual window care checklist costs £40–£80 in materials and takes under two hours. This prevents emergency repairs that typically cost £200–£600. The Glass and Glazing Federation recommends doing the six tasks once per year in spring or autumn.
- Annual window maintenance costs £40–£80, preventing £200–£600 emergency repairs.
- Complete the six-task checklist in under two hours each year.
- Lubricate hinges and locks with silicone spray, not oil-based products.
- Inspect seals and weatherstripping annually for gaps or cracks.
- Clean tracks and frames with a soft brush and mild detergent.
- A single annual window-care round costs roughly £40–£80 in materials, compared with £200–£600 for one emergency repair call-out.
- Your annual window-care checklist six tasks in under two hours
- Quick numbers time, cost, and failure rates for each task
- How to verify your window installer is MCS-certified (and why it matters for warranty)
- The three seal checks that prevent 70% of draught-related heat loss
- The one lubrication rule that extends hinge and lock life by three years
- When to call a professional (and the one test you can do yourself first)
- Eligibility for VAT relief on window repairs (if you're over 60 or disabled)
The financial case for proactive maintenance is clear: spending under £100 once a year can prevent a £200–£600 reactive repair bill. This article gives you a plain-English checklist that takes under two hours and covers the six tasks most likely to prevent that emergency call.
Your annual window-care checklist six tasks in under two hours
The following six tasks, recommended by the Glass and Glazing Federation (GGF, 2026), take a total of 90–120 minutes. Each task takes 10–20 minutes. Do them once per year, ideally in spring or early autumn when weather is mild.
- Visual inspection (15 minutes): Walk around every window, inside and out. Look for cracked glass, gaps in the frame, or signs of rot in timber frames. Note any issues for later action.
- Clean tracks and frames (20 minutes): Use a soft brush or vacuum attachment to remove dirt, grit, and cobwebs from the bottom track of sliding or sash windows. Wipe frames with a damp cloth and mild detergent.
- Lubricate moving parts (15 minutes): Apply silicone-based spray to hinges, locks, and friction stays. Avoid oil-based lubricants as they attract dirt and gum up mechanisms over time.
- Check seals and weatherstripping (20 minutes): Run a finger along the perimeter seal of each window. Look for gaps, cracks, or compression marks. Replace any weatherstripping that is brittle or missing.
- Test locks and hinges (15 minutes): Open and close each window fully. Ensure the lock engages smoothly and the hinge does not sag or bind. Tighten any loose screws.
- Clear drainage weeps (5 minutes): Locate the small slots at the bottom of the outer frame (weep holes). Use a thin wire or compressed air to clear any blockage. Blocked weeps cause water to pool inside the frame, leading to rot or mould.
Quick numbers time, cost, and failure rates for each task
The table below shows the average time, material cost, and percentage of annual window failures linked to neglect of each task, based on GGF claims data (GGF, 2026).
| Task | Time (mins) | Material cost (£) | % of annual failures linked to neglect |
|---|---|---|---|
| Visual inspection | 15 | 0 | 5% |
| Clean tracks and frames | 20 | 2–5 | 12% |
| Lubricate moving parts | 15 | 5–10 | 22% |
| Check seals and weatherstripping | 20 | 10–30 | 28% |
| Test locks and hinges | 15 | 0 | 15% |
| Clear drainage weeps | 5 | 0 | 18% (water ingress cases) |
Neglect of seals and weatherstripping accounts for the largest share of failures. Clearing drainage weeps, despite taking only five minutes, prevents nearly one in five water ingress cases.
How to verify your window installer is MCS-certified (and why it matters for warranty)
MCS (Microgeneration Certification Scheme) certification is the relevant standard for window installation, covering design, installation, and aftercare (MCS, 2026). Without MCS certification, most manufacturer warranties are void. You can check an installer’s MCS status on the MCS website or by calling 020 7090 1082.
For replacement windows, also check that the installer is registered with FENSA (Fenestration Self-Assessment Scheme). FENSA registration confirms the installer complies with building regulations for replacement glazing (FENSA, 2026). TrustMark is a secondary consumer-protection scheme that covers general home improvements, but it is not a substitute for MCS or FENSA.
How to find a certified window installer
The three seal checks that prevent 70% of draught-related heat loss
According to the Energy Saving Trust, 70% of draught-related heat loss through windows is caused by failing seals (Energy Saving Trust, 2026). Three specific seals need checking:
- Weatherstripping (the compressible strip around the opening part of the window): Run a finger along it. If it feels brittle, cracked, or does not spring back, replace it.
- Perimeter seals (the gasket between the frame and the wall): Look for gaps or compression marks. A visual check is usually enough.
- Glazing unit edge seals (the seal around the double-glazed unit itself): Look for condensation between panes. If you see misting, the edge seal has failed and the unit needs replacing.
Replacing weatherstripping yourself costs £10–£30 per window (Energy Saving Trust, 2026). Hiring a professional costs £80–£150 per window.
The one lubrication rule that extends hinge and lock life by three years
Use silicone-based spray only. Oil-based lubricants attract dirt and gum up mechanisms over time, accelerating wear. Apply silicone spray to hinges, locks, and friction stays once per year after cleaning the tracks and frames.
The GGF states that silicone lubrication extends hinge life by three years on average (GGF, 2026). A can of silicone spray costs £5–£10 and covers 10–15 windows.
When to call a professional (and the one test you can do yourself first)
Do the “paper test” before calling a professional. Close a window on a piece of paper and try to pull the paper out. If it slides out easily, the seal is failing. If the paper test fails, or if you see condensation between panes (indicating a failed sealed unit), call a FENSA-registered installer (FENSA, 2026).
A professional inspection typically costs £50–£100. Many installers deduct this fee from the repair cost if you proceed with them.
Eligibility for VAT relief on window repairs (if you’re over 60 or disabled)
Under the VAT Act 1994 (Schedule 8, Group 12), VAT relief (zero-rate) applies to window repairs for people over 60 or with a disability (GOV.UK, 2026). The work must be a repair, not a full replacement in all cases. The installer must hold a completed VAT relief declaration form from you. Check with your installer before booking.
VAT relief on home improvements for over-60s
Frequently Asked Questions
Perform the checklist once per year, ideally in spring or early autumn. The Glass and Glazing Federation recommends this annual frequency to prevent emergency repairs.
The six tasks are: visual inspection, cleaning tracks and frames, lubricating moving parts, checking seals and weatherstripping, testing locks and hinges, and tightening hardware. Each task takes 10–20 minutes.
Materials for an annual window care round cost roughly £40–£80, according to Checkatrade (2026). This is far less than a single emergency repair call-out, which costs £200–£600.
Yes, all six tasks are DIY-friendly and take under two hours total. You only need basic tools like a soft brush, silicone spray, mild detergent, and a vacuum attachment.
Neglecting maintenance can lead to broken hinges, failed locks, or cracked seals, costing £200–£600 per emergency call-out. The Glass and Glazing Federation warns that proactive care prevents these costly repairs.
