Double Glazing Repair Cost in Farnham 2026 | Window Glass Replacement Prices

2026 price guide for double glazing repairs and sealed unit replacement in Farnham, East Sussex. Covering misted window repair, broken glass replacement, handle & lock fixes, and draught sealing for uPVC, timber, and aluminium windows. Includes local glazier rates, emergency board-up costs, and how to choose reliable specialists in Farnham.

Sealed Unit Replacement (Standard)

£85–£180

For misted or broken glass unit

Emergency Board-Up Service

£65–£130

24/7, temporary secure cover

Lock/Handle Mechanism Repair

£45–£100

Parts & labour, per window

Draught Seal Replacement

£30–£75 per window

Improves efficiency, reduces noise

2026 Double Glazing Repair Price Breakdown

Service in Farnham	Cost	Local Notes
Misted Unit Repair (Standard Pane up to 1m²)	£85–£160	Most common repair. Full sealed unit (IGU) replacement, not just drilling.
Broken Glass Replacement (Single Pane, Standard)	£75–£160	Cost depends on glass type (standard, toughened, laminated).
Broken Double Glazed Unit (Large/Bay Window)	£160–£400+	For large or shaped units, especially in Farnham's period homes with bay windows.
Emergency Board-Up (After Break-In/Accident)	£65–£130	24/7 call-out fee + materials. Common for ground floor windows.
Window Lock/Handle Replacement (uPVC Espag)	£45–£100	Espag or cockspur mechanisms. Key locking handles cost more.
Hinge Repair/Replacement (uPVC, per side)	£60–£120	For sagging or stiff windows. Often needed on frequently opened windows.
Draught Seal/Gasket Replacement (per window)	£30–£75	Improves thermal efficiency. Common in Farnham's older double glazing (15+ yrs).
Window Mechanism Gear Repair (Tilt & Turn/uPVC)	£70–£140	For windows that won't open/close properly. Gearbox or mechanism replacement.
Glass in Conservation Area (Patterned/Leaded)	£250–£600+	Specialist work, may require planning consent in parts of historic Farnham.
Timber Sash Window Glass Replacement (Single Pane)	£100–£250	Specialist glazing into timber, often using putty. Common in period properties.
Condensation Between Panes (Ventilation Unit)	£50–£100	Installing trickle vents to reduce condensation, not a sealed unit replacement.

Popular Repair Packages

Efficiency & Comfort Package

£160–£320

Replace draught seals on 5-6 windows, service hinges & locks, clean & lubricate tracks, install 2x trickle vents.

Security & Function Package

£120–£250

Replace/repair locks on 3-4 windows, fix 1x stiff hinge, adjust all windows for smooth operation.

Multi-Window Misted Unit Repair

£250–£550

Replace 3-4 standard misted sealed units in one visit. Discount on individual unit price.

What Affects Double Glazing Repair Costs in Farnham?

Glass Type & Specification: Standard float vs. toughened (safety) vs. laminated/acoustic vs. Low-E/argon filled.
Size, Shape & Location: Standard square pane vs. large bay window, curved top, or hard-to-access loft window.
Frame Material & Age: uPVC (most common), timber (period homes), aluminium. Older frames may need extra care.
Access & Safety: Ground floor vs. upper floors requiring scaffolding or long ladders.
Conservation Status: Properties in conservation areas may require specific glass or planning, increasing cost.
Urgency: Scheduled repair vs. emergency call-out for broken/unsafe windows.

Area-Specific Considerations in Farnham

Historic Centre & Conservation Areas

Timber sash window repair & restoration
Sympathetic glass replacement for period styles
Potential planning constraints on appearance

Suburban 20th Century Homes

High volume of standard uPVC window repairs
Misted units common as seals reach 15-20 year lifespan
Replacement of 1980s/90s style handles and locks

Rural & Outlying Properties

Exposure to weather causing seal degradation
Large agricultural or barn-style windows
Potential for travel surcharges

Choosing a Window Repair Specialist in Farnham

Check for FENSA Registration or Competent Person Scheme

While not mandatory for repairs, FENSA registration shows knowledge of building regulations. For work in conservation areas, choose a company experienced with local planning requirements and traditional methods.

Ask About Glass Specifications & Guarantees

A good glazier will specify the type (toughened/laminated), thickness, and energy rating (e.g., Low-E, Argon filled) of the replacement unit. They should provide a 10-year guarantee on the sealed unit against misting.

Assess Diagnostic Skills & Knowledge of Period Features

They should identify the root cause (failed seal, mechanical stress, impact) and advise on repair vs. replacement. For period properties, they must understand timber window construction and traditional glazing methods.

Local Farnham, East Sussex Insight

Farnham's historic character means many homes have timber sash windows or early uPVC installations now needing repair. The town's conservation areas strictly control window appearance; always check if your home is in one. For period timber windows, repair is often preferable to replacement to maintain character. The local climate can stress seals, and older uPVC windows (1990s/2000s) are now failing. Consider upgrading to modern Low-E glass during replacement for better energy efficiency. For rental properties, ensure all ground floor locks meet insurance requirements. A local specialist will know the common issues with Farnham's property types and can advise on the most sympathetic and effective solutions.

FAQs

Can a misted double glazed window be repaired without replacement?

True sealed unit misting cannot be permanently fixed by drilling or "de-misting" kits. These are temporary. The only reliable solution is replacing the entire insulated glass unit (IGU). Beware of companies offering cheap "permanent" fixes.

How long should a double glazed sealed unit last?

A quality unit should last 15-25 years. Failure often occurs due to seal degradation from UV exposure, extreme temperature fluctuations, or poor original installation.

When is toughened (safety) glass legally required?

Toughened glass is required in all doors and side panels, windows less than 800mm from the floor, and within 300mm of doors up to 1500mm high. A reputable glazier will know and comply with these Building Regulations.

Is it worth repairing old uPVC windows or replacing the whole window?

If the frame is structurally sound, replacing the glass unit and updating hardware is cost-effective (10-25% of new window cost). If frames are discoloured, warped, or mechanisms are obsolete, full replacement may be better for long-term efficiency and security.

Conclusion

Double glazing repair in Farnham costs £85–£180 for a standard misted unit replacement and £45–£100 for lock repairs. Always use a knowledgeable specialist who provides guaranteed sealed units and understands local conservation requirements. For period properties, seek out expertise in timber window repair to preserve character while improving performance.

Tip:

Clean window frames and tracks regularly to prevent mechanism issues. Slightly open windows during very hot weather to reduce pressure on sealed units. For period timber windows, use a specialist maintenance product (not household cleaner) to preserve the wood and seals.