Staircase Design for a Delhi House: The Bye-Law Sizes, Where Vastu Puts It, and How Much Space It Takes on a Small Plot

A staircase in a Delhi house has to satisfy three things at once: the minimum sizes in the building bye-laws, a position in the plan that works for light, circulation and, if the family follows it, vastu, and a footprint the plot can afford, because on a residential plot the staircase is counted in the floor area you are allowed to build. For a house on its own plot, Delhi's Unified Building Bye-Laws 2016 ask for a stair at least 0.9 m wide where the dwelling unit is up to 50 sqm and 1.0 m where it is larger, treads of at least 25 cm, risers of no more than 150 mm, no more than 12 risers in a flight, and 2.2 m of headroom under landings. Vastu practice puts the stair in the south, west or south-west of the house, climbing clockwise, and keeps it out of the centre and the north-east. At those minimum sizes, a two-flight stair for a 3.0 m floor height takes roughly 6 to 7 sqm on every floor. This guide sets out each rule with its clause, works through the space a stair takes on a 50, 100 and 200 gaj plot, compares the stair types, and lists the mistakes to avoid.

What Size Must a Staircase Be Under Delhi's Bye-Laws?

The Unified Building Bye-Laws for Delhi 2016 cover a house's internal stair in two places. Table 7.1 sets the width for low-rise residential buildings: 0.9 m for a dwelling unit of up to 50 sqm and 1.0 m above that, with a note that where upper floors are added to an existing low-rise house whose staircase was built 900 mm wide under the 1983 bye-laws, the same width may continue upwards. Clause 7.11 sets the rest. The minimum tread, without nosing, is 25 cm for an internal staircase in a low-rise residential building and 30 cm in other buildings, including high-rise residential, and treads must be built and maintained so that they do not become slippery (7.11 f). Winders are allowed in low-rise residential buildings, provided they are not at the head of a downward flight (7.11 f). The clause as printed in the DDA's compendium sets the maximum riser at 150 mm and limits a flight to 12 risers (7.11 g). Headroom under a landing and under the staircase must be at least 2.2 m (7.11 i), and beams, columns and other building features may not reduce the headroom or the width (7.11 q). Interior stairs must be built of non-combustible material throughout (7.11 a), which RCC, steel and stone satisfy.

What Else Do the Bye-Laws Say About Stairs in a House?

A lift may open onto the staircase landing on a residential plot of up to 500 sqm where the building is below 15 m, provided it does not obstruct movement (7.28.1), but a staircase may not be arranged round a lift shaft (7.11 c), so the lift sits beside the stair, not inside its well; our home lift guide covers the rest. A mumty over the staircase on the top floor, up to 3 m high, is excluded from both the building height and the FAR (7.19 and 7.17.2 c). Parapets and handrails at the edge of an accessible terrace must be between 1.0 m and 1.5 m high (7.22), and access to the overhead tank for inspection, by a ladder or another open means, is mandatory (7.10.3). The bye-laws mention spiral stairs only as fire escapes, limited to a low occupant load and a building height of 9 m, and at least 1.5 m in diameter (7.11 v). Height changes the rules: buildings 15 m high or more must have at least two staircases (7.10.2), though where travel distance and the other requirements are met the second may be a fire escape (7.10.1), and lifts become mandatory at 15 m (7.28). If a stilt-plus-four design will reach 15 m, measured from the highest surrounding road level to the top of the roof slab, settle the staircase question with your architect and fire consultant before the plan is frozen; our Fire NOC guide covers the fire rules.

Does the Staircase Count in Your FAR?

Yes, in a house on a residential plot. Clause 7.17.2 lists what is left out of covered area for FAR and ground coverage, and its item (n) excludes the area of 'all staircase/s, Fire Tower/s in high rise/low rise buildings, excluding residential plotted development'. In other buildings the stairs are left out of FAR; in a plotted house they are counted. Plinth steps (7.17.2 m) and the mumty over the stair (7.17.2 c) remain excluded. That is why the size of the stair is a planning decision on a small plot: every square metre it takes is a square metre of room you cannot build.

How Much Space Does a Staircase Take on a Small Plot?

More than it looks on the plan. Take a floor-to-floor height of 3.0 m. At the maximum riser of 150 mm that is 20 risers, and with no more than 12 in a flight it has to be at least two flights, so the compact choice is a dog-legged stair of two flights of 10 risers each with a half landing. Each flight has 9 treads, which at the minimum 25 cm gives 2.25 m of going. With 1.0 m flights, a half landing 1.0 m deep and a narrow gap between the flights, the stair occupies about 2.1 m by 3.25 m, roughly 6.8 sqm on every floor, before you add a landing at each floor to step off onto. With 0.9 m flights it is about 1.9 m by 3.15 m, roughly 6 sqm. Set against the plot, a 6.8 sqm stair is about 16% of the area of a 50 gaj plot (41.8 sqm), about 8% of a 100 gaj plot (83.6 sqm) and about 4% of a 200 gaj plot (167.2 sqm), on every floor, and because it counts in FAR it comes out of the floor area you are allowed. Our guide to what you can build on a 100, 150 or 200 gaj plot has the coverage and FAR figures to set it against.

Which Type of Staircase Suits a Delhi House?

Dog-legged: two flights side by side with a half landing, a compact layout for a given floor height, which is why it suits narrow plots. Straight: one direction, simple to build and to climb, but at 20 risers it needs a landing part-way and a run of about 5.5 m (two flights of 2.25 m and a 1.0 m landing), so it fits only along the long side of a deep plot. L-shaped or quarter-turn: fits a corner and opens up the plan, for a little more area than a dog-leg. Open-well: generous and bright, but it costs area, and the well cannot hold the lift (7.11 c). Spiral: saves floor area but is steep and tight, awkward for furniture and for older people, and the bye-laws treat it as a fire escape, so it suits a secondary stair to the terrace rather than the main stair of a house. Winders at the turn of a dog-leg save a little more space in a low-rise house, provided they are not at the head of a downward flight.

Where Should the Staircase Go as per Vastu?

Vastu practice places the staircase in the south, west or south-west part of the house, climbing clockwise, and keeps it out of the centre of the house (the brahmasthan) and out of the north-east corner, as our ten vastu tips for house construction set out. Common vastu advice also keeps a pooja room or a toilet out of the space under the stairs; storage is the use it allows. Two practical points make vastu and the bye-laws sit together. On a north- or east-facing plot, a stair in the south or west falls at the back of the house, which suits an internal family stair but not a common stair that has to serve separately let floors from the gate; decide early whether the upper floors will ever be let separately, because a shared stair needs its own entrance. And whatever direction you choose, the stair still has to meet the widths, treads and headroom above, so fix its position in the first sketch, not after the rooms have been drawn around it. If you are still choosing the plot, our plot selection guide covers orientation.

RCC, Steel or Stone: What Should the Staircase Be Built Of?

RCC for the main stair of a house: cast with the frame, stiff, quiet underfoot and non-combustible, finished in stone, tiles or wood on top. Steel is lighter and quicker, easy to add to an existing house and good for open-riser designs, but it needs corrosion protection and a stiff design to avoid bounce and noise. Stone slabs cantilevered from a wall are traditional but depend entirely on the wall they sit in; treat them as a structural element for the engineer, not a finish. Whatever the structure, the finish matters, because the bye-laws ask for treads that do not become slippery: choose a finish with grip, or add anti-skid nosing strips, especially on polished marble. When we built a new RCC staircase at DPS Dwarka, designed for heavy daily foot traffic, the treads were given an anti-skid finish for student safety; the case study describes the work.

What Goes Wrong With Staircases in Delhi Houses?

Headroom lost to a beam over the lower flight, which the bye-laws do not allow (7.11 q) and which is expensive to correct once cast. Risers that vary within a flight because the floor finishes were not allowed for; a stair should be set out from finished floor to finished floor, with the thickness of the stone or tiles included, so that every riser is the same height, and a first or last step made taller or shorter to absorb an error is where people trip. Meters, inverters and gas cylinders packed under the only staircase: the bye-laws keep electrical shafts, ducts and gas pipes out of staircases (7.11 n), and a fire under the only stair blocks the only way out, which is why buyers now look for it, as our guide to checking a builder floor explains. A single stair carried down to a basement: where there is only one staircase it must end at the ground floor, with the basement reached by a separate stair (7.11 t). A width fixed for today's two floors when the family plans four: the stair is the one element you cannot widen later, so size it for the building you will eventually have, and remember that an old house can carry its 900 mm stair upwards only under the Table 7.1 note. And a handrail on one side only, or none at all on the terrace flight. For a house with older parents, the bye-laws' accessibility chapter is a sensible benchmark even though it does not apply to private residences (clause 11.0): a handrail on both sides, continuous at landings, with its top 900 mm above the pitch line and a second rail at 760 mm (11.5.3).

Nirman Ved works the staircase into the first plan with your architect, builds it in RCC to the bye-law sizes, and prices it within our house construction packages from ₹1,500 per sqft of built-up area. We are trusted by DAV Pitampura and DPS Dwarka for campus civil repairs and maintenance. To plan a house around its staircase, call +91-7838355055 or book a free site visit.