Slim Frames, More Glass — Aluminium Windows Built to Last a Lifetime
Premium ALuK 58BW aluminium windows, British-fabricated by Arkay and precision-fitted by our Newmarket team. Choose the seamless Flush casement or the steel-look Slimline — both thermally broken, PAS 24 secure, and covered by our 10-year guarantee.
Windows You'll Never Have to Think About Again
Ask anyone who's swapped tired uPVC or draughty timber for aluminium and they'll tell you the same two things: the rooms feel brighter, and the windows simply never need fussing over. No warping, no repainting, no swollen frames after a wet Suffolk winter — just slim, strong frames and a lot more glass. It's why aluminium windows have become one of the most requested upgrades we fit from our Newmarket base, in homes across Cambridge, Bury St Edmunds, Ely, Haverhill and throughout Suffolk and Essex.
We install the ALuK Optio 58BW window range, fabricated in Britain by Arkay Windows, in two beautiful variants: the 58BW Flush, a modern flush casement where the sash sits perfectly level with the frame, and the 58BW ST Slimline, a steel-look window with whisper-thin sightlines that suits everything from period cottages in Woodbridge to contemporary builds on Newmarket. Both are thermally broken to keep your home warm, tested to PAS 24 security standards, available in hundreds of colours, and fitted by our own installation team — never subcontractors. We can even pair them with the matching ALuK 58BD entrance door for a perfectly consistent look.
Every installation starts with a free, no-obligation survey, is protected by our 10-year guarantee, and is FENSA-certified for building regulations compliance.
Choose Your System
Not sure which is right for your home? The simple version: the 58BW Flush gives you a clean, seamless modern face; the 58BW ST Slimline gives you the elegant look of steel windows with the warmth and security of modern aluminium. Our consultants will walk you through both at your survey.
ALuK 58BW Flush
A beautifully engineered flush casement window that suits almost any home. The opening sash sits completely level with the outer frame, so from the street the whole window reads as one clean, uninterrupted face. Friction stays on the side-hung sashes give it outstanding weather resistance — perfect for exposed coastal spots like Felixstowe.
| Style | Fully flush sash-to-frame casement |
|---|---|
| Thermal performance | U-values from 1.4 W/m²K (DG), 1.2 (TG) |
| Energy rating | WER B–C, thermally broken |
| Weather rating | Class 4 air & Class 9A water (600 Pa), 2400 Pa wind |
| Security | PAS 24 tested, Secured by Design |
| Colours | Hundreds of RAL & dual-colour finishes |
ALuK 58BW ST Slimline
For homeowners who want maximum glass and that timeless steel-window character. With fixed-light sightlines from just 43mm and hardware styled after traditional steel frames, the ST is a favourite for heritage properties, conservation areas and steel-window replacements — while quietly delivering modern insulation and security the originals never could.
| Style | Slimline, traditional steel-look profiles |
|---|---|
| Visible sightline | From just 43mm (fixed light) |
| Thermal performance | U-values from 1.4 W/m²K (DG), 1.1 (TG) |
| Glazing | Double or triple glazed, units up to 32mm |
| Security | PAS 24 tested, Secured by Design |
| Colours | Full RAL range, anodised & marine-grade options |
Lead Times
Aluminium Window Price Guide
The prices below are honest, indicative ranges for standard colours including professional installation — no hidden extras. Your exact quote depends on sizes, the system you choose (Flush or ST Slimline), glazing specification, opening styles and any structural work.
| Window Type | Typical Size | Estimated Price Range |
|---|---|---|
| Single Casement | Up to 1.2m wide | £750 – £1,100 |
| Multi-Pane Casement (Most Popular) | Up to 2.4m wide | £1,100 – £1,900 |
| Bay or Bow Window | 3–5 panes | £2,200 – £3,800 |
| Whole House — 3-Bed Semi | 8–10 windows | £8,000 – £12,000 |
| Whole House — 4-Bed Detached | 12–15 windows | £12,000 – £16,500 |
Customisation & Upgrades
- Bespoke Colours: Hundreds of RAL colours, textured and anodised finishes to match any aesthetic perfectly.
- Dual Colours: Anthracite Grey outside, Crisp White inside? Dual-colour manufacturing is available.
- Triple Glazing: Step down to U-values as low as 1.1 W/m²K for maximum warmth and quieter rooms.
- Matching Entrance Door: Add the ALuK 58BD residential door in the same colour for a perfectly coordinated frontage.
Recent Aluminium Window Installations
A selection of our slimline aluminium window installations across Ipswich, Kesgrave, Woodbridge, Felixstowe and the surrounding areas.
Frequently Asked Questions
What Our Window Customers Say
Reviews related to our aluminium windows
We replaced our old timber windows with the slimline steel-look system and the difference is incredible. The house is noticeably warmer and the frames look beautiful against the brickwork.
Whole house done in two days, spotless work and the flush casements in anthracite grey have completely transformed the front of our home. Lead time was exactly as promised.
Living near the seafront we needed something that could take the weather. No pressure at the survey, honest advice on the coastal finishes, and the fitters were polite and tidy throughout.
Cannot recommend Micron enough. They matched our new front door to the windows perfectly and the attention to detail on the finishing trims is exceptional.
Interested in Aluminium Windows? Let's Chat.
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reply within one working day Visit Our Showroom See the windows in person
in Newmarket — kettle's on
We'll answer all your questions and take you through the next steps in a relaxed, no sales pressure environment — and your survey and quotation are always free.