Casement Window Cost

A casement window is hinged at the side and opens outward like a door, offering excellent ventilation and unobstructed views.

Full opening for maximum ventilationEasy to clean from insideExcellent seal when closed
£500 - £1,500

Average Price Range

A

Energy Rating

High

Security Rating

20-30 years

Typical Lifespan

Casement windows represent one of the most versatile and efficient window designs available in the UK market. Hinged at the side like a door, these windows open outward, offering unobstructed views and excellent ventilation capabilities. Their design creates a tight seal when closed, making them exceptionally energy-efficient compared to other window styles. This seal not only prevents drafts but also enhances security, as the hook-shaped casement locks embed deeply into the frame. Originally popularized during the Tudor period in Britain, casement windows have evolved significantly while maintaining their fundamental appeal. Modern versions feature advanced locking mechanisms, friction hinges that hold the window in any desired position, and multi-point locking systems for enhanced security. The versatility of casement windows makes them suitable for virtually any room in your home. They can be installed individually, in pairs (French casement style), or as part of a larger window configuration. The outward opening design makes them ideal for areas where interior space is limited, such as above kitchen sinks or countertops. Available in various materials including uPVC, aluminum, timber, and composite, casement windows can complement any architectural style from traditional to contemporary. Their clean lines work well in modern settings, while period designs with leaded glass or Georgian bars suit heritage properties. Energy-efficient double and triple glazing options further enhance their performance, making them an excellent investment for reducing heating costs and environmental impact.

Advantages

  • Excellent ventilation
  • Good security when closed
  • Energy efficient with tight seal
  • Easy to operate
  • Unobstructed views

Disadvantages

  • Can be caught by wind when open
  • Limited size options for very large openings
  • Opening mechanism may deteriorate over time

Best Suited For

Most residential homes

Kitchens and bathrooms

Areas requiring good ventilation

Casement Window Replacement Costs

The table below shows average replacement costs for Casement Window windows of different sizes, including supply and installation. Prices may vary based on specification, glazing options, and your location.

Window SizeSupply OnlyInstallationTotal CostTime to Install
Small (600 × 900mm)£375£150 - £250£5752-3 hours
Medium (1000 × 1200mm)£650£200 - £300£9003-4 hours
Large (1200 × 1500mm)£1,000£250 - £350£1,3004-5 hours
Extra Large (1800 × 2100mm)£1,425£300 - £450£1,8005-6 hours

Cost Factors

Factors that increase cost:

  • Triple glazing (+15-25%)
  • Acoustic glass for noise reduction (+10-20%)
  • Enhanced security features (+5-15%)
  • Custom finishes or colors (+5-10%)

Ways to save on cost:

  • Multiple window replacement discount (10-15%)
  • Standard sizing rather than custom dimensions
  • Off-peak installation (winter months)
  • Comparing quotes from multiple installers

Cost Comparison by Material

Different materials affect both the initial cost and long-term value of your Casement Window windows. Below we compare typical costs and benefits:

MaterialPrice RangeEnergy EfficiencyLifespanMaintenance
uPVC£520 - £650Good (A-C)20-25 yearsLow
Aluminum£780 - £975Good (B-C)30-40 yearsLow
Timber£910 - £1170Good (B-C)30+ yearsMedium-High
Composite£1040 - £1300Excellent (A+)30-40 yearsLow

Long-Term Value Considerations

While uPVC is typically the most affordable option for Casement Window windows, materials like timber and composite may offer better long-term value when considering lifespan, property value enhancement, and energy savings.

Initial Investment

uPVC offers the lowest upfront cost, while composite materials represent the highest initial investment.

Energy Savings

Composite and modern timber windows often provide the best thermal performance, resulting in higher energy savings.

Property Value

Timber and composite windows typically add more to property value, especially in period properties.

Key Features

Full opening for maximum ventilation

Easy to clean from inside

Excellent seal when closed

Compatible with all frame materials

Opening Mechanisms

Side-Hinged
Default Mechanism

Side-Hinged

Window opens outward from a side hinge like a door.

Advantages

  • Provides full opening
  • Good for emergency exits
  • Simple mechanism

Disadvantages

  • Requires space outside for opening
  • Can be caught by wind
Top-Hinged
+£25

Top-Hinged

Window opens outward from a top hinge.

Advantages

  • Allows ventilation during light rain
  • Secure opening option
  • Less affected by wind

Disadvantages

  • Limited opening angle
  • Not suitable for emergency exit

Maintenance

Maintenance Requirements

Medium - hinges and handles require occasional lubrication

Typical Lifespan: 20-30 years

Casement Window Variations

Top-Hung Casement
Additional Cost: £75

Top-Hung Casement

Hinged at the top instead of the side, opening from the bottom.

French Casement
Additional Cost: £150

French Casement

Double casement windows that open from the center with no central mullion.

Material Options

Excellent Compatibility

uPVC

Excellent Compatibility

Price Range:£250-£1200
Lifespan:20-30 years
Thermal Efficiency:Good
Maintenance:Very Low

Most common combination - affordable and practical

Aluminum

Excellent Compatibility

Price Range:£450-£2200
Lifespan:30-40 years
Thermal Efficiency:Poor to Good (with thermal break)
Maintenance:Very Low

Creates a modern look with slim sightlines

Timber

Excellent Compatibility

Price Range:£550-£2800
Lifespan:25-35 years
Thermal Efficiency:Very Good
Maintenance:High

Traditional look, often used in period properties

Composite

Excellent Compatibility

Price Range:£600-£3000
Lifespan:30-45 years
Thermal Efficiency:Excellent
Maintenance:Low

Premium option offering best of both worlds

Installation Guide

Installing Casement Window typically involves measuring the window opening, removing existing windows, preparing the opening, and installing the new window frame. Professional installation is recommended to ensure proper fitting, sealing, and functionality.

Installation Process

  1. Measuring - Accurate measurement of the window opening
  2. Removal - Careful removal of existing windows
  3. Preparation - Clean and prepare the window opening
  4. Installation - Position and secure the new window frame
  5. Sealing - Apply proper sealing to ensure weatherproofing
  6. Finishing - Complete internal and external finishing work
  7. Testing - Check operation and make adjustments

Professional Installation

Professional installation ensures proper fitting and sealing

Installers have the right tools and equipment for the job

Installation typically takes 1-2 days depending on the number of windows

Professional installation often includes warranty and after-service

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