3Gen HDB flat floor plan: size, layout & how to measure it

115–122 m²
typical internal floor area (≈1,250–1,300 sq ft)
4 bedrooms (2 with attached bath)
layout

Designed for multi-generation households in Singapore, 3Gen flats run ~115–122 m² with four bedrooms, two of them en-suite, so more wet areas and more skirting runs than a 5-room.

What the layout looks like

The second en-suite means an extra bathroom threshold and more tile-to-vinyl transitions. Layouts are modern BTO style: household shelter, service yard, and an A/C ledge that must stay out of the floor area.

Measuring it accurately

The reliable way to measure any 3gen plan is off the drawing itself: calibrate against a printed dimension line, then trace each room along the inside face of the walls. Count the bathroom thresholds carefully: with two en-suites plus a common bath, threshold strips and transition profiles are easy to under-quote. Perimeter view gives you the skirting runs per room directly.

PlanTape does the tracing for you. It detects every labelled room and the scale line in under two minutes, you fine-tune the corners, and the per-room areas and skirting perimeters export as a CSV — in square metres and metres.

Measure your 3gen plan now
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Common questions

How big is a 3gen hdb flat?

Typically 115–122 m² (≈1,250–1,300 sq ft) of internal floor area, with 4 bedrooms (2 with attached bath). Exact size varies by year and builder; the floor plan for your specific unit is the only reliable source.

How do I measure a 3gen hdb flat floor plan for a flooring quote?

Upload the floor plan PDF to PlanTape: it traces each room along the inside face of the walls and calibrates scale from a printed dimension. Count the bathroom thresholds carefully: with two en-suites plus a common bath, threshold strips and transition profiles are easy to under-quote. Perimeter view gives you the skirting runs per room directly. Then export per-room areas and perimeters as CSV, in m² and metres.

What should I watch out for on 3Gen plans?

The second en-suite means an extra bathroom threshold and more tile-to-vinyl transitions. Layouts are modern BTO style: household shelter, service yard, and an A/C ledge that must stay out of the floor area.

Other home types

2-room Flexi3-room HDB4-room HDB5-room HDBExecutive AptMaisonette