Window and Conservatory Repair Guide

Whether you are dealing with "blown" double glazing that obscures your view or a conservatory roof that leaks during a downpour, timely intervention is key. Addressing small issues early prevents structural dampness and keeps your home secure against intruders and the elements.

What Does the Work Involve?

Window and conservatory repairs cover a broad spectrum of tasks, ranging from simple hardware swaps to complex structural resealing. A typical repair project will involve:

• Initial Assessment: Identifying the root cause of draughts, leaks, or "misted" glass units.
• Glazing Replacement: Removing the beads and replacing failed or cracked double-glazed units (IGUs) while keeping the original frames.
• Hardware Maintenance: Replacing "friction stays" (hinges), handles, and multi-point locking mechanisms that have seized or broken.
• Gasket and Seal Renewal: Pulling out perished rubber gaskets and installing new ones to eliminate whistling draughts.
• Conservatory Roof Repairs: Replacing slipped polycarbonate panels, fixing leaking lead flashing, or clearing blocked box gutters.
• Realignment: Adjusting dropped doors or window sashes that are "catching" on the frame.

Typical Costs

The following table outlines expected costs for window and conservatory repairs in the UK for 2025/26. Prices include VAT and standard labour rates.

Costs are primarily influenced by the material of your frames (uPVC is cheapest, followed by aluminium and timber) and the height of the repair. If scaffolding or specialist "easy-access" equipment is required for conservatory roof work, prices will increase significantly.

How Long Does It Take?

Most window repairs are completed within a single visit, though glass replacement requires two visits: one for measuring and one for fitting.

• Handle or Hinge Replacement: 30 to 60 minutes per window.
• Replacing a Blown Glass Unit: 20 to 40 minutes (after a 3-5 day lead time for manufacturing).
• Conservatory Leak Investigation: 1 to 2 hours to identify and patch.
• Full Conservatory Roof Overhaul: 1 to 2 days depending on size and weather conditions.

DIY or Professional?

While a confident DIYer can change a window handle, most window and conservatory repairs require professional tools and expertise. Handling large panes of glass is dangerous, and incorrect installation can lead to further seal failure or water ingress. Professional repairs usually come with a guarantee (typically 5–10 years for glass units), which is vital for maintaining your home's value.

Always hire a professional for conservatory roof work. Working at height on translucent surfaces is high-risk and requires specialist crawling boards to distribute weight safely.

Choosing the Right Tradesperson

Not all window companies want small repair jobs; many prefer full installations. Look for specialists who specifically advertise "window repairs" or "misted unit replacement."

• Check Qualifications: Look for installers registered with FENSA, CERTASS, or the GGF (Glass and Glazing Federation).
• Insurance: Ensure they have Public Liability insurance (minimum £1m-£2m).
• Red Flags: Be wary of tradespeople who insist a whole window needs replacing when only the glass is misted, or those who ask for full payment upfront.
• Questions to Ask:
  • Does the price include the disposal of the old glass?
  • How long is the guarantee on the new sealed unit?
  • Are the replacement hinges of the same "stack height" as the originals?

UK Regulations

Repairs are generally less regulated than full replacements, but specific standards still apply to ensure safety and efficiency.

• Part K (Building Regs): Any glass replaced in "critical locations" (doors, low-level windows, or bathrooms) must be replaced with toughened or laminated safety glass.
• Part L (Thermal Efficiency): Replacement glass units should ideally meet or exceed the thermal performance of the original units to maintain the building's energy rating.
• Friction Stays: Fire egress windows must be fitted with specific hinges that open to 90 degrees to allow for emergency exit.

Common Problems

• Misted Units: Caused by the "spacer bar" desiccant becoming saturated. This cannot be "cleaned" out; the entire glass unit must be replaced.
• Dropped Sashes: Often caused by "toe and healing" issues where the glass isn't braced correctly inside the frame, causing the window to catch.
• Whistling Draughts: Usually a sign of a failed hinge (friction stay) that is no longer pulling the window tight against the seal.
• Conservatory Damp: Often misdiagnosed as a roof leak when it is actually a blocked box gutter or failed lead flashing against the house wall.

Frequently Asked Questions

Can you fix a misted double-glazing unit without replacing the glass?

No. While some companies offer to drill holes to "dry out" the unit, this is a temporary fix. The seal has failed, and the internal desiccant is ruined; only a full unit replacement guarantees a clear view and thermal performance.

Why is my conservatory leaking only when it rains heavily?

This is often due to "overspill" from blocked gutters or slipped roof panels. Heavy rain can also expose failed gaskets or "cap-end" seals that are fine during light showers but fail under the pressure of high water volume.

Do I need to replace the whole window if the lock is broken?

Rarely. Most uPVC and aluminium windows use standardised multi-point locks or "gearboxes" that can be easily unscrewed and replaced for a fraction of the cost of a new window.

How can I tell if my window hinges need replacing?

If you can see a gap between the frame and the sash on the hinge side when the window is closed, or if you feel a draught even when the handle is locked, the hinges are likely worn or bent.

Will new glass units match my existing windows?

Modern glass is very clear, but older units may have a slight tint. A professional will match the thickness (e.g., 24mm or 28mm) and the spacer bar colour (silver, white, or black) to ensure it looks consistent with the rest of your home.