Service Profile · Sliding Windows (25 × 50 mm)

The everyday window, built properly.

A 25 × 50 mm aluminium sliding window — two- or three-track — for the windows in a Mumbai flat that don’t need a 16 × 45 slim section. Bedrooms, studies, kitchens, small balcony enclosures. Properly gasketed, properly rollered, built to outlast the no-name market window by a decade.

Send the dimensions

Or call Suraj — +91 98703 08481

Section

25 × 50 mm

Tracks

2 or 3

Panel span

Up to 1.8 m

Glazing

5 / 6 / 8 mm

Rollers

SS 304

Frame life

12+ years

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Chapter 01 · The Problem

The window most flats
have is the wrong window.

A standard Mumbai bedroom or study window is the place fabrication economics break down most quietly. The market window — the one bought from the local aluminium shop — is fine the day it's installed. Five years later the rollers seize, the gasket disintegrates, the lock slips, and the first heavy monsoon finds a way past it.

The window stops being the cheap line in the BOQ and starts being the line that quietly outlasts everything around it.

The local-market sliding window

Plastic rollers, MS hardware, 0.5 mm wall thickness. Looks fine year one. Year five the family is wiping water off the sill every monsoon morning.

ii.

The UPVC window

Better gasket performance. But the section is heavy, the colour ages yellow in Mumbai sun, and the hardware is rarely worth its price. Wrong material for a sea-facing flat.

iii.

A 16 × 45 slim slider

Beautiful — but specifying our slim series across every bedroom and study window in a 4 BHK is overkill. The brief most flats need is everyday, properly built, not designer-spec everywhere.

iv.

The fourth answer

A 25 × 50 mm aluminium sliding window — properly gasketed, SS 304 rollered, 12-year frame life. The right section for the room and the budget, not a downgrade or an upgrade.

Chapter 02 · How it works

Three parts.
None of them cheap.

A 25 × 50 frame

Two- or three-track depending on the opening. Top, bottom and side jambs cut on a 0.5 mm tolerance — the difference between a panel that glides and one that drags. Anodised or powder-coated to match the rest of the flat.

SS 304 rollers

Sealed ball-bearing rollers, four per panel. They are the part that fails first on a market window — and the part we over-specify on every install. SS 304 stops the rust path that takes a market roller out in three years.

EPDM gasket and a multi-point latch

A continuous EPDM gasket on every meeting edge and the head and sill. A two-point or three-point latch on the leading stile draws the panel into the gasket on close — the seal is positive, not just a pressure fit.

—

No plastic rollers.
No MS bolts.
No felt-strip "gasket".

The parts that fail in a market window are simply not in this one. Suraj reads the drawing — every flat gets the section sized against the actual opening, not the catalogue average.

Chapter 03 · Material

What it’s made of.
Down to the latch.

A 25 × 50 mm aluminium section is the workhorse of the Mumbai window — and the place where build quality matters most because the window is replicated across a whole flat. Same aluminium family as our slim series, same stainless hardware, same gasket spec — just sized for the everyday window.

Material 01

The section — 6063-T6 at 25 × 50 mm.

Architectural aluminium drawn to a 25 × 50 mm profile with a wall thickness of 1.4–1.6 mm — substantially heavier than the 0.5–0.8 mm wall the local market window runs. Anodised silver, champagne or black; powder coat to any RAL.

Material 02

The glass — 5, 6 or 8 mm.

5 mm float as standard for bedroom and study windows. 6 mm where panel spans cross 1.5 m or for noise-sensitive rooms facing a road. 8 mm toughened on bathroom and kitchen windows — and on any opening within reach of a child.

Material 03

The hardware — all stainless.

SS 304 ball-bearing rollers, sealed against humidity. Multi-point latch in solid stainless — no zinc-plated handle that pits in three monsoons. EPDM continuous gasket. Every fastener stainless. The same hardware family as our 16 × 45 slim slider.

Chapter 04 · Where it’s installed

The everyday window.
Across the whole flat.

Bedroom windows, study, kitchen, bathroom (with appropriate glass), small balcony enclosures. The 25 × 50 is the spec for every opening in a Mumbai flat that doesn't need our slim 16 × 45 series — a designer-led replacement of every old window in a 3 BHK is a typical job for us.

Bedroom · Bandra

The most common install.

A 1.5 m bedroom window in a 1980s building — replacing the original aluminium window that has lost its rollers and gasket. New 25 × 50 frame, SS 304 rollers, EPDM gasket. Two-day site work per opening.

Study · Worli

Quiet road-facing room

Kitchen · Powai

8 mm toughened, 3-track

Bathroom · Juhu

Frosted glass, ventilation

Children’s room · Khar

Paired with an Invisible Grill

Balcony enclosure · Lower Parel

Half-height enclosure

South Mumbai · Sea-facing

Marine-grade gasket and SS 316 hardware within 1 km of the coastline

Chapter 05 · Comparison

A direct read on the
seven decisions that matter.

Local-market sliding window

UPVC window

16 × 45 slim series

Aditi 25 × 50 Sliding Window

Frame life in Mumbai

4–6 years

8–10 years

15+ years

12+ years — properly built

Roller life

Plastic, fails in 3 yr

Decent — sealed

SS 304 ball-bearing

SS 304 ball-bearing — sealed

Gasket on monsoon edge

Felt strip — disintegrates

EPDM — adequate

EPDM — premium

EPDM — continuous, replaceable

Section visual weight

25 × 50 (light wall)

Heavy 60 × 50 UPVC

16 × 45 slim

25 × 50 — middle ground

Cost per opening

Cheapest

Higher than ours

Premium designer-spec

Right-priced for whole-flat work

Salt-air performance

Hardware fails in 3 yr

Frame yellows

SS 316 option

SS 316 hardware option

Replaces an old window

Same socket, same problems

Custom cut, slow

Premium retrofit

Sized to the existing reveal

Chapter 06 · Benefits

Rarely a single feature.
Always the combination.

Right-priced for whole-flat replacement.

A 3 BHK with 8–12 windows is the typical job. The 25 × 50 sits between the local-market window and our slim 16 × 45 series — a price point that works across every bedroom, study and kitchen without inflating the BOQ.

A 12-year frame life.

The frame is 6063-T6 at 1.4–1.6 mm wall thickness — meaningfully heavier than the 0.5–0.8 mm wall a market window runs. The aluminium oxidises into a stable surface; the section does not fatigue.

Monsoon-tight EPDM gasket.

Continuous EPDM gasket on every meeting edge and the head and sill — replaceable if it ever does need work. The leading stile latch draws the panel into the gasket on close. Water sits on the outside, where it should.

Smooth-rolling SS 304 rollers.

Sealed ball-bearing rollers in stainless steel — four per panel. They are the single biggest reason a market window fails in three years and ours runs for twelve. Same roller family as the slim slider; we don't downgrade hardware to hit a price point.

Retrofit replacement of old windows.

A 2-day site replacement per opening — old window out, reveal cleaned, new frame measured to the existing socket, glazed and gasketed on day two. No civil work in most cases. We coordinate with the society for material movement before we cut anything.

Mosquito-net integration from drawing stage.

The frame is drawn with a 25 mm side rebate for our retractable mosquito-net cassette. AC season, the net pulls across the open window; rest of the year, the net rolls back into the side and you don't see it.

A choice of glazing.

5 mm float on quiet bedroom windows. 6 mm on noise-facing rooms or wider panels. 8 mm toughened on kitchen and bathroom openings, and any opening within reach of a child. DGU optional on AC-heavy rooms.

2-track or 3-track, sized to the opening.

Two-track for openings up to 1.5 m — faster operation, simpler frame. Three-track for wider openings or where a fixed panel is needed alongside a slider. The track count is decided at drawing approval, not site-improvised.

Designer-direct.

Suraj reads the drawing. Even on the 25 × 50 — which is the everyday section — he measures the openings himself on a whole-flat install. The relationship is the brand, not just the slim-series doors that make the brochure.

Chapter 07 · Common questions

The questions a designer
asks before the quote.

Because the 16 × 45 is a designer-spec section sized for living-room sliders and signature openings — specifying it across every bedroom and study in a 4 BHK is overkill. The 25 × 50 is the right answer for the everyday window: still aluminium, still SS 304 rollers, still EPDM gasketed. Right-sized for the room and the budget.

12+ years on the 25 × 50 with the EPDM gasket and SS 304 hardware. The aluminium itself oxidises into a stable surface and does not fatigue. The first part to need attention is the gasket — and the gasket is replaceable in a five-minute service call without dismantling the panel.

Almost always yes. We measure the existing reveal, fabricate the new frame to the socket size with a gasketed shim if the opening is irregular, and replace the window in a 2-day install per opening — no civil work in most cases. Society approval is the only thing we want lined up before site day.

In normal use, yes. The SS 304 ball-bearing rollers are sealed against humidity — the moisture path that takes a plastic-rollered market window out at year three is closed. If a roller ever does need swapping after a decade, it is a service call, not a re-installation. The frame stays.

Yes — and we recommend specifying the rebate at drawing stage. The frame leaves a 25 mm side cassette space for our retractable net. Pull it across in two seconds; roll it back into the side when the season is over. Retrofitting later is possible but the cassette becomes surface-mounted.

A typical 3 BHK with 8–12 windows takes 14–18 working days from drawing approval to completion. Site work is staged room by room so the family can stay in the flat throughout — bedroom day one, study day two, kitchen day three, and so on. Drawing-to-approval cycle adds 7 days at the front.

Pricing depends on opening size, glazing choice, track count, and whether it is a fresh install or a like-for-like replacement. Send the dimensions or the drawings of a couple of openings and we'll quote within two working days. We do not publish a per-square-foot rate — small windows cost more per sq ft than large ones, so the number is misleading on whole-flat scopes.

Send the dimensions

Send the dimensions.
We’ll quote in two days.

No site-visit fee. No call-centre. No quote written before measurement. Suraj measures the openings himself on whole-flat replacement work — the 25 × 50 is the everyday window, but it gets the same designer-direct attention as the slim-series sliders.

If the brief includes a balcony slider alongside the bedroom and study windows, ask about pairing the 25 × 50 windows with our 16 × 45 slim slider on the same install — one fabricator, one shop drawing, one snag list.

Phone

+91 98703 08481

surajgudhka@gmail.com

Web

www.aditienterprise.org

Workshop

Santacruz (East), Mumbai

aditi enterprise · Aluminium fabricators for Mumbai's interior designers, architects and HNI residences.