How Much Does Double Glazing Cost in the UK? (2026 Price Guide)

How Much Does Double Glazing Cost in the UK?

The average cost of double glazing in the UK depends on property size, window style, frame material, and glazing specification.

Typical full-house double glazing costs:

• Small property (5–6 windows): £2,500 – £4,500
• Medium property (8–12 windows): £4,500 – £8,500
• Large property (15–20+ windows): £8,500 – £15,000+

Per window installed:

• £400 – £1,200 per window on average

Premium or bespoke designs can exceed £2,000 per window.

Double Glazing Cost Per Window (UK Breakdown)

Typical installed costs per window:

• Small casement window: £400 – £650
• Standard casement window: £500 – £900
• Large bay window: £1,000 – £2,500
• Sliding sash window: £800 – £1,800
• Tilt and turn window: £600 – £1,200
• Triple glazing upgrade: +20% to +40% cost increase

What Affects the Cost of Double Glazing?

1. Frame Material

Frame choice is a major cost driver:

• uPVC: most affordable and widely used
• Aluminium: modern look, higher cost
• Timber: premium aesthetic, highest maintenance cost

Typical differences:

• uPVC: lowest cost
• Aluminium: 20%–40% more
• Timber: 30%–80% more

2. Window Size and Style

• Larger windows increase material and installation cost
• Bay windows and shaped designs require more labour
• Sash-style windows are more complex to install

3. Glazing Type

• Standard double glazing: baseline cost
• Argon-filled glass: slightly higher cost, better insulation
• Triple glazing: premium option, higher thermal efficiency

4. Property Access

Installation complexity can increase costs:

• Easy ground-floor access: standard pricing
• First/second floor installation: scaffolding required
• Difficult access properties: increased labour costs

5. Energy Efficiency Rating

Higher-rated windows cost more upfront:

• A-rated windows: standard premium
• B/C-rated: cheaper but less efficient
• Passive house standards: highest cost

Labour Costs for Double Glazing Installation

Labour typically accounts for 30%–50% of total cost.

Typical installer rates:

• Installer: £150 – £250 per day
• Two-person fitting team: £300 – £600 per day
• Scaffolding (if required): £500 – £2,000+

Typical installation time:

• 1–3 days for most houses
• Larger properties may take up to 1 week

Example Double Glazing Costs

Small Property (Terraced House)

• 5–6 windows
• uPVC frames
• Total cost: £2,500 – £4,000

Medium Property (Semi-Detached)

• 8–12 windows
• Mix of standard and large windows
• Total cost: £4,500 – £8,500

Large Detached Property

• 15–20+ windows
• Mix of bay, sash, and large openings
• Total cost: £8,500 – £15,000+

Hidden Costs in Double Glazing

Additional costs may include:

• Scaffolding: £500 – £2,000+
• Window removal and disposal: £100 – £500
• Brickwork repairs after installation: £200 – £1,500
• Custom glazing shapes: £200 – £1,000+
• Interior finishing (plastering/painting): £200 – £1,000

Regional Price Differences in the UK

• London & South East: 10%–25% higher
• Midlands: average UK pricing
• North of England: slightly lower labour costs
• Rural areas: higher due to travel and logistics

Types of Double Glazing

uPVC Windows

• Most common option
• Affordable and low maintenance
• Good thermal efficiency

Aluminium Windows

• Slim frames, modern appearance
• Strong and durable
• Higher cost

Timber Windows

• Traditional aesthetic
• High maintenance
• Premium pricing

How Long Does Double Glazing Last?

• uPVC: 20–35 years
• Aluminium: 30–45 years
• Timber: 25–50+ years (with maintenance)

How Long Does Installation Take?

• Small property: 1 day
• Medium property: 1–2 days
• Large property: 2–5 days

How to Get an Accurate Double Glazing Quote

To avoid inaccurate pricing, installers should:

• Count all windows precisely
• Measure each opening accurately
• Include scaffolding where needed
• Check for structural or brickwork repairs
• Factor in frame material differences
• Include disposal of old units
• Allow for finishing works internally and externally

Double glazing quotes are often inconsistent due to variation in sizing and hidden structural issues.

How Pricing Penguin Helps Window Fitters

Customers often don’t have a clear understanding of what a construction job should cost before they speak to a tradesperson. As a result, many enquiries come in “cold” — with unrealistic expectations, mismatched budgets, or purely price-driven intent. This leads to wasted time quoting jobs that were never viable in the first place.

Pricing Penguin changes that dynamic by giving customers a realistic, data-driven price range before they ever pick up the phone or submit an enquiry.

Instead of guessing or waiting for a contractor to explain costs after the fact, customers can immediately understand:

• What their type of job typically costs in their area
• What drives the price up or down (size, materials, complexity, access, etc.)
• Whether their budget is realistically aligned with the work they want done

This creates a pre-qualified customer before the first interaction even happens.

For contractors, this means fewer wasted site visits, fewer unrealistic enquiries, and a much higher proportion of leads that are actually ready to proceed. Rather than spending time filtering out low-quality leads, tradespeople can focus on quoting and winning work that already fits their pricing structure.

In short, Pricing Penguin acts as a pricing filter between customer expectation and real-world construction costs — improving conversion quality, saving time, and helping contractors focus on profitable work instead of time-wasting enquiries.

FAQ

How much does it cost to replace all windows in a house?

Typically £4,500 – £15,000 depending on property size and specification.

What is the cheapest type of double glazing?

uPVC casement windows.

Is triple glazing worth it?

It improves insulation but increases cost by 20%–40%.

Does double glazing increase house value?

Yes — it improves energy efficiency, comfort, and resale appeal.

Conclusion

Double glazing in the UK typically costs £400–£1,200 per window, with full-house installations ranging from £2,500 to £15,000+.

Costs depend heavily on frame material, window size, and installation complexity.

For homeowners, understanding pricing prevents overpaying.

For installers, accurate estimating is essential to protect margins and win work consistently.

Better pricing leads to better projects — and stronger construction businesses.