Frameless pivot shower door swing radius in a 750mm Yelahanka niche: the toilet-clearance trap architects calculate at drawing stage and miss during site walk

A frameless pivot door hung in a 750mm-wide niche with a toilet 450mm away looks fine on the RCP. On site, at handover, the toilet-seat lid catches the glass at 30 degrees of swing. The architect, the glass fitter, and the plumber have each assumed the other has checked the clearance. None have. This is the calculation that lives in the gap between drawing and reality—and it costs a site visit to fix.

The 750mm niche and the pivot-door geometry

Start with the niche. A 750mm-wide opening is standard for Bangalore residential en-suites and secondary bathrooms—common in Yelahanka, Whitefield, and Sarjapur Road projects where plot widths compress bathroom footprints. The pivot hinge is mounted on the glass itself, typically 10mm or 12mm low-iron tempered, and the door swings outward into the toilet zone.

The pivot axis sits at the edge of the glass—not at the niche wall. For a 750mm-wide door, the pivot is positioned 12–15mm inboard from the finished niche edge to allow for the hinge hardware. This means the glass edge, when fully open (90 degrees), projects 750mm minus 15mm = 735mm into the room. At 45 degrees (a common mid-swing position), the horizontal projection is 735mm × sin(45°) = 520mm. A toilet set 450mm from the niche wall now has only 450mm − 520mm = −70mm of clearance—the glass is already 70mm into the toilet zone.

The code requirement—whether you reference the National Building Code or Bangalore's own RWA guidelines—is a minimum of 450mm of clear space in front of a toilet seat. Most architects check this at 0 degrees (door closed) and forget to check at 45 degrees (door mid-swing, when a user is most likely to be moving in or out of the shower).

Where the drawing misses the site reality

The RCP view hides the arc

A reflected ceiling plan shows the door in the closed position. The swing radius is a note on the elevation or section, if it is noted at all. A designer working in HSR Layout or Indiranagar will often specify a frameless pivot door without running a clearance radius check against the toilet position. The plumbing layout is drawn separately; the shower enclosure is drawn separately. The coordination happens verbally on site, and by then the niche is built.

The toilet position is not always locked

In a 1800mm-wide bathroom, there is usually flexibility to shift the toilet 50–100mm. But by the time the glass fitter arrives, the soil pipe is set. The architect has not issued a coordination drawing showing the toilet centre-line relative to the shower niche edge. The fitter measures the niche, orders the door, and arrives to fit it. The clearance failure appears only when the door is hung.

The three solutions: radius reduction, door type, and repositioning

Solution 1: Reduce the swing radius with a smaller door or a different hinge type

If the niche is fixed at 750mm and the toilet is 450mm away, you can reduce the swing radius by reducing the door width. A 700mm-wide door in a 750mm niche leaves 50mm of frame or side panel on one edge. This reduces the projection at 45 degrees to 685mm × sin(45°) = 485mm—still too close. A 650mm door reduces it to 460mm projection, leaving 450mm − 460mm = −10mm. Still a failure.

Alternatively, specify an offset-pivot hinge that allows the pivot axis to sit further inboard. Some hinge systems can position the pivot 30–40mm from the glass edge instead of 12–15mm. This shifts the arc inward and reduces the swing radius into the toilet zone by 15–25mm. It is a small gain but sometimes enough to clear code. Check the shop drawing from your glass supplier; not all pivot systems allow this offset.

Solution 2: Specify a sliding door or a hinged side panel instead of a pivot

A sliding door does not swing. It travels parallel to the niche wall on a top and bottom track. A 750mm opening accommodates a 750mm-wide sliding door; the projection into the room is zero. The trade-off is aesthetic—a sliding door requires a visible track and has a different visual weight than a frameless pivot. Many architects in Koramangala and Indiranagar prefer the clean line of a pivot; a sliding door reads as more utilitarian.

A hinged side panel is another option: a fixed glass panel on one side of the niche and a hinged door on the other. The hinged section can be narrower (say, 400mm) while the fixed panel takes up 350mm. The hinged door swings only 400mm, reducing the projection at 45 degrees to 400mm × sin(45°) = 283mm. This clears the toilet easily. The visual cost is the vertical mullion between the fixed and hinged sections; some architects accept this, others do not.

Solution 3: Reposition the toilet during the design phase

The cleanest fix is to move the toilet forward (into the room) by 100–150mm during the design coordination. This shifts the clearance boundary from 450mm to 550–600mm, and a standard pivot door in a 750mm niche will clear it. This requires a coordination drawing issued before the plumbing is roughed in—typically at the end of the SD (schematic design) phase or the start of DD (design development). If the architect has not issued this drawing by the time the MEP consultant is detailing, the shift becomes expensive or impossible.

The specification language that prevents the miss

When you specify a frameless pivot shower door in low-iron clear glass, add this to your specification:

• Pivot hinge offset from glass edge: [specify 12mm, 20mm, or 30mm based on your clearance calculation].
• Swing radius clearance check: Door projection at 45 degrees shall not exceed [specify the safe distance, typically 400–420mm for a 450mm toilet clearance].
• Shop drawing to include: Plan view showing niche width, door width, pivot axis position, and swing arc at 0°, 45°, and 90°. Toilet centre-line and toilet-seat projection to be shown on the same drawing.
• Site coordination: Glass fitter to confirm toilet position and clearance on site before ordering door. Any deviation from the coordinate drawing to be flagged to the architect before fabrication.

This language shifts the clearance check from a verbal assumption to a documented requirement. It also makes the glass fitter responsible for flagging a conflict before the door is cut—not after it arrives on site.

Bangalore-specific humidity and glass durability in the niche

A frameless pivot door in a 750mm niche is exposed on three sides during the monsoon (June through September). Bangalore's hard water—typically 200–300 ppm TDS from the Cauvery—deposits mineral films on the glass, especially on the lower edges where water pools. Specify 10mm or 12mm low-iron tempered glass; the low-iron composition resists mineral staining better than standard float glass. If the door is positioned tight to the toilet, water splash during cleaning will accelerate the staining. Ensure the glass has been treated with a hydrophobic seal (applied at the atelier before delivery) and brief the homeowner on weekly vinegar-and-water cleaning during the monsoon months.

Questions we get asked

Can we fit a standard 750mm pivot door and adjust the toilet position on site?

No. The soil pipe is cast into the slab; shifting the toilet after the slab is poured costs 80,000–120,000 rupees and delays handover by 2–3 weeks. The toilet position must be locked during the design phase, and the shower-door clearance must be checked against that locked position before any niche is built.

What is the minimum toilet-clearance distance code requires?

The National Building Code specifies 450mm of clear space in front of a toilet seat, measured from the finished wall or fixture edge. Bangalore RWAs often enforce this strictly. If your design leaves less than 450mm at any swing angle, it will fail inspection and require a redesign at handover.

Does a sliding door solve the clearance problem?

Yes. A sliding door does not swing and has zero projection into the room. If the toilet clearance is the constraint, a sliding door removes the constraint entirely. The trade-off is visual: a sliding door requires a visible track and does not have the minimalist aesthetic of a frameless pivot. Many architects in Bangalore prefer the pivot for this reason.

Can the pivot hinge be moved inboard to reduce the swing radius?

Some hinge systems allow the pivot to sit 30–40mm inboard from the glass edge instead of the standard 12–15mm. This reduces the swing radius by 15–25mm. Check the shop drawing from your glass supplier; not all frameless systems offer this flexibility. If your supplier offers an offset-pivot option, it is worth specifying—it can be the difference between a pass and a failure.

What happens if the door is fitted and the clearance fails?

The door must be removed and either replaced with a narrower door, repositioned, or swapped for a sliding model. This costs 35,000–60,000 rupees and delays handover by 1–2 weeks. It also creates a paper trail with the structural engineer and the local authority. Specify the clearance correctly at drawing stage, and this becomes a non-issue.

Commission a fitted shower door for your Bangalore project by talking to the atelier. Bring your site dimensions, toilet position, and niche width. We will run the clearance calculation and provide a shop drawing for your approval before any glass is cut.