Aluminium Flush Sash Windows Installers South London & Surrey

Love the look of traditional timber windows, but not the rot, repainting and sticking that come with them? Glitz Windows & Doors supplies and fits aluminium flush sash windows across South London and Surrey. You get slim frames, crisp lines and a period look, backed by the strength and low upkeep of modern aluminium.

What Are Aluminium Flush Sash Windows?

In a flush sash window, the opening sash sits level with the outer frame instead of standing proud of it like a standard casement. When it’s closed, the window looks like one clean, flat surface, much like an original timber sash.

Aluminium takes that look further. The material is strong enough to hold large panes of glass in very slim frames, so you get more light and sharper detailing than you would with most other materials. Modern frames are thermally broken, which means an insulating barrier inside the frame stops heat from escaping. The result is a window that looks like it belongs on a period home but performs like a new one. See our full range of Aluminium windows for other styles and finishes.

You’ll sometimes see them called flush casement windows. It’s the same idea: a casement that opens outwards but sits flat within the frame.

Why Choose Aluminium for a Flush Sash Window?

A Timber Look Without the Timber Problems

Flush sash windows have the proportions and shadow lines of traditional joinery. Aluminium won’t rot, swell or need repainting every few years, so the look lasts without the weekend jobs.

Slim Frames and More Light

Aluminium’s strength lets us keep frames narrow and glass areas large. Rooms feel brighter, and the windows look neat from both inside and out.

Warmer, Quieter Rooms

Thermally broken frames combined with double or triple glazing keep heat in and reduce draughts. They also take the edge off traffic and street noise, which matters on busy South London roads.

Strong and Secure

Multi-point locking and toughened glass options come as standard [confirm], so a period look doesn’t mean weaker security.

Built to Last

Powder-coated aluminium resists corrosion and fading, and holds its finish through years of British weather. A wipe-down now and then is about all it needs.

Colours to Suit Your Home

Choose from a wide range of RAL colours, from classic white and heritage greens to anthracite grey and black. Dual-colour finishes let you pick one shade for outside and another for inside.

Made-to-Measure Flush Sash Windows

Every window we supply is made to fit your exact opening, not a standard size. On period homes that matters even more, because openings are rarely perfectly square.

We can match the proportions, glazing bars and detailing of your existing windows, so the new ones sit naturally on the house. Options include:

Fixed lights: for panes that don’t need to open
Top-hung and side-hung openers: for ventilation where you need it
Georgian and heritage bars: for a traditional multi-pane look
Bay and bow configurations: for period fronts with existing bays
Choice of hardware: heritage-style handles and stays in a range of finishes

Aluminium Flush Sash Window Installation

A good window only performs if it’s fitted well. As experienced flush sash window installers, we look after every stage ourselves, so you deal with the same team from start to finish.

Free Survey & Quote

We visit your home, check each opening and talk through your options. You'll get a clear, written quote with nothing vague in the small print.

Design & Specification

Together we choose the style, glazing, colour and hardware. We'll flag anything to consider early, such as conservation area rules.

Manufacturing

Your windows are made to your exact measurements. We'll give you a realistic lead time up front so you can plan around the work.

Professional Fitting

Our flush sash window fitters remove the old frames, prepare the openings, and fit the new windows square, level and properly sealed. We protect your floors, keep mess down and clear up at the end of each day.

Final Checks & Aftercare

Before we leave, we test every window, adjust the hardware and show you how everything works. As a FENSA-registered installer, we handle the paperwork so your certificate comes to you.

Aluminium Flush Sash Window Replacement

If your timber windows are rotting or sticking, or your old uPVC has yellowed and lost its seals, replacement is one of the best upgrades you can make. You’ll notice warmer rooms, fewer draughts, better security and a much smarter look from the street.

We remove the old frames, make good around the openings and fit windows that suit the age and style of your home. You can replace a single window or the whole house, and we’ll keep the styles consistent so it all looks right.

If your home is in a conservation area or is a period property, we’ll help you choose designs that respect its character. Always check with your local planning authority before ordering.

Aluminium Flush Sash Window Repair

You don’t always need new windows. If your frames are sound, a repair can be a much more affordable fix. We can usually sort:

Misted double-glazed units: we replace the sealed unit and keep your frame
Worn hinges, handles and locks: repaired or replaced so everything works and locks properly
Tired seals and draughts: new gaskets and adjustment for a tight close
Sticking or misaligned sashes: realigned so they open and close smoothly

If the frames are badly damaged or very old, we’ll tell you straight and talk you through replacement instead.

Why Choose Glitz Windows & Doors?

25+ Years of Window Experience

We've spent more than 25 years working on windows and doors across South London and Surrey. We know the local housing, from Victorian terraces to 1930s semis, and what works on each.

FENSA-Registered Installation

We're FENSA-registered, so your installation meets Building Regulations and you'll receive an official certificate. You'll need it when you sell.

A Local Team

You'll speak to people who know the area and are close enough to get to you quickly if something needs sorting.

Honest, Itemised Quotes

Free measurements, a clear written price and no pressure to go ahead.

What Our Customers Says About Us

Aluminium Flush Sash Windows FAQs

How much do aluminium flush sash windows cost?

It depends on the number of windows, their sizes, the layout, the glazing and the finish. Flush sash windows usually cost more than standard casements, and aluminium generally costs more upfront than uPVC. Get in touch for a free survey and an itemised quote for your home.

What is the difference between flush sash and casement windows?

Both open outwards on side or top hinges. On a flush sash, the opening section sits level with the frame for a traditional, flat look. On a standard casement, it sits proud of the frame.

Are aluminium flush sash windows suitable for period properties?

Yes. Their slim frames and flat profile closely match traditional timber joinery, which makes them a popular choice for Victorian, Edwardian and Georgian homes.

Can I fit them in a conservation area?

Often yes, but the rules are stricter. The council may ask for windows that match the original style, and some properties need consent. Always check with your local planning authority before ordering. We’re happy to advise at your survey.

Do I need planning permission to replace my windows?

Usually not. Replacing windows in a typical house is often permitted development. Exceptions include listed buildings, conservation areas with an Article 4 direction and some flats or leasehold properties.

How long do aluminium flush sash windows last?

With basic care, they can last for decades. The powder-coated finish resists fading and corrosion, and a wipe-down now and then is usually all they need.

Can you repair flush sash windows, or do they need replacing?

Often they can be repaired. Misted glass, worn hardware, tired seals and sticking sashes are all common fixes. If the frames are badly damaged, replacement may make more sense. We’ll take a look and give you an honest answer.

Aluminium Flush Sash Window Installation, Repairs & Replacement

Need Aluminium Flush Sash Window Services in South London & Surrey?

Whether you’re installing new aluminium flush sash windows, replacing old ones or need a repair, our team is here to help.

Other Aluminium Window Styles We Offer

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