Standard casement
A clean all-round replacement style with balanced sightlines and broad suitability across contemporary and mixed-style properties.
- 75mm sightline
- Best all-round route for most homes
- Flat, chamfered, or ovolo styling options
Windows
Aluminium Casement Windows
Slim aluminium casement windows supplied and fitted for sharper Romford and Essex elevations.
- ALUK 58BW aluminium casement system
- Sightlines from 66mm (heritage) to 75mm (standard)
- U-value 1.4 W/m²K (double) or 1.2 W/m²K (triple)
- PAS 24 and Secured by Design options
Overview
What is an aluminium casement window?
Aluminium casement windows are the right route when the house needs a sharper frame line than a standard uPVC replacement can usually give. They suit Romford and Essex extensions, remodelled rear elevations, larger openings, and homes already using aluminium bi-fold doors, sliding patio doors, roof lanterns, or darker trims. Cii surveys, supplies, and fits the full package, checking reveal depth, opener layout, colour, glass, trickle vents, and security specification before issuing a fixed written quote.
Secured by Design and PAS 24 options available for higher-security specifications
Class 4 air permeability and 9A water tightness on the tested platform
Internally or externally beaded configurations depending on design requirement
Green Guide A rated aluminium system with slim contemporary sightlines
Single and dual-colour powder coating across the RAL range
Survey, fitting, and sign-off handled in house by Cii
Personalise Your Window
Colours & Finishes
Frame colour: Pure White
Standard colours
Dual colour may be available, with different interior and exterior frame finishes depending on the range.
Aluminium hardware finish
Aluminium casements are usually chosen for slim sightlines, so handle and hinge finishes should stay clean, coordinated, and appropriate to the powder-coated frame colour.
Made to measure. We confirm the colour, glazing, handle finish, and opening layout during your survey.
Aluminium hardware finish
Aluminium casements are usually chosen for slim sightlines, so handle and hinge finishes should stay clean, coordinated, and appropriate to the powder-coated frame colour.
Made to measure. We confirm the colour, glazing, handle finish, and opening layout during your survey.
Design Choices
Choose profile and security specification
Compare style routes and opening/security setups for aluminium casement projects. Final specification is confirmed during survey.
Made to measure
Three profile routes with different sightline character
Standard, flush, and heritage all sit on the aluminium casement platform, so you can tune the final look without changing product family.
Flush casement
The sash sits level with the frame face for a tighter, premium finish where detailing matters more than a standard projected sash.
- Flush external finish
- Premium appearance on refurbishments
- Strong fit for design-led upgrades
Heritage steel look
A slimmer route intended to replicate traditional steel-style window proportions with sharper vertical lines and lighter frame presence.
- 66mm sightline
- Steel-look styling for period-industrial schemes
- Compatible with slim bar layouts
Opening formats and security options in one platform
Mix vent formats around the house while keeping a consistent frame family, then choose security and glazing packages to suit each elevation.
Opening configurations
Top-hung, side-hung, tilt-before-turn, fixed lights, bays, and coupled frames can all be specified from the same system.
- Top and side hung vents
- Tilt-before-turn option
- Bay and coupled frame assemblies
Security specification
Specify PAS 24 and Secured by Design packages with robust locking hardware for projects where tested security is a key requirement.
- PAS 24 option
- Secured by Design option
- Multi-point locking hardware
Glazing performance tuning
Glazing build-ups from 24mm to 40mm allow thermal, acoustic, and solar-control priorities to be tuned by room orientation and use.
- 1.4 W/m²K double glazing route
- 1.2 W/m²K triple glazing route
- Acoustic laminate glazing options
Product fit
Slimmer aluminium frames for modern Romford and Essex homes
Aluminium casements are normally specified when slimmer sightlines, powder-coated colour, and a cleaner architectural finish matter more than the lowest-cost replacement route. They suit extensions, larger openings, and homes where standard white uPVC would look too heavy against aluminium doors, roof lanterns, dark trims, or modern render.
Best fit for
- Modern extensions and remodelled rear elevations
- Larger openings where a slimmer frame is visually useful
- Homes matching other aluminium doors, rooflights, or lanterns
Consider another option when
- Lowest cost is more important than sightline and colour flexibility
- A warmer traditional uPVC finish would suit the house better
- The room needs inward opening or easy cleaning access
What we check on survey
- We check frame depth against the existing reveal, plaster line, trickle vent requirement, and sill detail.
- We discuss whether aluminium should be used throughout or only on visible extensions and rear elevations.
- We confirm powder-coated colour, dual-colour requirements, glass, security package, and lead time before quoting.
Useful comparisons
Casement windowsCompare the practical default for most full-house uPVC replacements.
Flush sash windowsCompare a flatter timber-look casement for visible elevations.
Sliding sash windowsCompare the vertical sash route for Victorian, Edwardian, and bay-fronted homes.
Sash horn windowsCompare traditional horn detailing without always choosing a true sliding sash.
Tilt and turn windowsCompare inward-opening windows for cleaning access and secure ventilation.
Aluminium tilt and turnCompare aluminium sightlines with inward cleaning and secure tilt ventilation.
Optional Upgrade
Integral blinds for slim aluminium window lines
Aluminium casements are chosen for sharper sightlines and a more modern finish. Integral blinds support that look by keeping privacy and glare control inside the glazed unit rather than adding bulky dressings around the frame.
Minimalist aluminium finish
A neat option where slim frames, powder-coated colour, and clean reveals are part of the brief.
Useful on aluminium casements when
- The room needs a modern finish with fewer visible fittings
- Larger aluminium panes face bright sun or neighbouring views
- You are matching aluminium doors, rooflights, or dark frame details
Blind types we can discuss
Magnetic integral blinds
A slim magnetic slider raises, lowers, and tilts the blind inside the sealed glass unit.
Electric integral blinds
Remote operation suits larger panes, harder-to-reach glass, and cleaner contemporary rooms.
What we check
- Glass unit size and cavity depth
- Handle position, reveal depth, and room layout
- Whether magnetic or electric operation is worth pricing
We check the glass unit depth, sash size, colour route, and whether magnetic or electric operation is proportionate for the opening.
Ask about aluminium window blind upgradesCore Information
Key information for Aluminium Casement Windows
The main performance, specification, and installation details that shape how this product works in practice.
Best For
Where this range fits best
Modern extensions and sharper rear elevations around Romford and Essex
Larger openings where a slimmer frame line is worth the extra specification
Homes matching aluminium bi-folds, sliding doors, roof lanterns, or dark trims
Energy efficiency
Thermally broken aluminium framing with polyamide thermal breaks and glazing options from 24mm to 40mm keeps this range strong on performance as well as appearance. Whole-window U-values can reach 1.4 W/m²K, dropping to 1.2 W/m²K with triple glazing, making these windows a strong fit for modern refurbishments and extension work.
Security
This aluminium casement range can be specified to Secured by Design and PAS 24 standards, with robust locking hardware and rigid aluminium sections that remain controlled even on larger vents. That matters when you want slim sightlines without compromising day-to-day security or weather performance.
Colours and specification
Aluminium opens up a much broader powder-coated finish range than a standard replacement window. Popular choices such as anthracite grey, black, and white remain available, but the real flexibility comes from bespoke RAL colours and dual-colour inside/outside combinations. Profile styling can also be tuned between flat contemporary, chamfered, or ovolo detailing depending on whether the project is modern or more traditional.
Installation and guarantee
All aluminium casement installations are covered by Cii's 10-year installation guarantee and signed off on completion with Assure certification where applicable.
System Benefits
Performance Benefits Beyond Style Choices
After the design specification is set, these are the technical and delivery strengths that matter most in day-to-day use.
Weather-tested platform
The tested aluminium system targets Class 4 air permeability and 9A water tightness to support reliable weather performance on exposed elevations.
Thermally broken frame engineering
Polyamide thermal break technology and deeper glazing build-ups help deliver strong thermal outcomes while retaining slimline aluminium proportions.
Durable powder-coated finish
Factory-applied powder coating is designed for long-term colour stability with low ongoing maintenance compared with painted timber systems.
Survey-led installation by Cii
Specification, fitting, and sign-off are handled by Cii so build quality is controlled from first measure to final handover.
How It Works
From Survey to Sign-off
Step 1
Survey & elevation match
We measure every opening and check the lintel, sill, and reveal, then plan the slim aluminium sightline against the elevation as a whole and anything aluminium already on the property: bi-folds, sliding doors, roof lanterns, or dark trims. We agree single or dual-colour powder coating, the opener layout, which rooms need a fire-escape egress sash, where trickle vents are required, whether a standard, flush, or steel-look profile suits each opening, and the security specification before quoting.
Step 2
Made to measure
Each casement is built to the measured size on the thermally broken 58BW aluminium platform, with the chosen profile route, 24mm to 40mm double or triple glazing, the powder-coat RAL finish inside and out, and the multi-point locking and weather seals (PAS 24 or Secured by Design where specified) all locked together before manufacture.
Step 3
Install & sign-off
Our Cii team fits and seals each frame, adjusts every opener and the locking so it runs cleanly on the slimmer aluminium sections, fits trickle vents where Building Regulations require them, and hands over with the Cii 10-year installation guarantee and Assure certification.
Free Survey
Ready to price up your aluminium casement windows?
Tell us the opening and the finish you want, and we will survey it, confirm the aluminium casement windows specification, and give you a fixed written quote with no obligation rather than a generic estimate.
Free surveyFixed quoteDirect Cii installation team
Google
“Outstanding from start to finish. The casement windows are a perfect fit and the energy difference is already noticeable. The lads were tidy, efficient, and clearly knew their trade.”
Google
“Replaced all 12 windows across our Victorian terrace. Every window fits perfectly, the sightlines are great, and the house is noticeably warmer. Superb job.”
Checkatrade
“Fantastic experience from initial survey to completion. The team were professional, tidy, and the attention to detail on the finish was fantastic. Couldn't be happier with our new windows.”
Questions Answered
