150 Gaj House Plan: 3 BHK Builder Floor Layouts and Cost (2026)

What a 150 gaj plot gives you

A 150 gaj house plan gives you a full 3 BHK on every floor, a stilt for two or three cars, and enough width for a lift beside the stair. That is why 150 gaj is the plot size builders in Delhi NCR buy first when they want to construct and sell floors. If you own one, you are sitting on the most flexible small plot in north India.

The arithmetic: one gaj is 9 sq ft, so 150 gaj is 1,350 sq ft or about 125 sq m. The most common shape is 30x45 feet. You also see 27x50 in Noida sectors and 25x54 in some Faridabad and Ghaziabad colonies. The 30 feet width is the number that matters, because it lets you put two rooms side by side with a passage between them, which is what a proper 3 BHK needs.

As an urban planner I spend a lot of time on 150 gaj plots because they sit right at the boundary of two bylaw bands in many cities. Plots up to 100 sq m get one set of coverage and setback rules, plots from 100 to 250 sq m get another. At 125 sq m you are in the second band, so the generous 90 percent coverage of a 100 gaj plot does not apply. Expect 75 to 80 percent coverage and a front setback of 1.5 to 3 m.

The builder floor pattern explained

A builder floor is a plot built as stilt plus independent floors, each floor sold or rented as a separate flat with its own entrance from the common stair. The pattern is so common on 150 gaj plots in Gurgaon, South Delhi and Noida that the plan has become almost standard. Here is how it is laid out.

1. Stilt floor: columns on a grid, two to three car bays, a guard room of 6 x 8 feet, the stair and the lift core on one side wall.
2. Stair and lift core: 10 to 11 feet wide along the full depth, with the lift of 5 x 6 feet beside a 3.5 feet wide stair. The core takes 120 to 150 sq ft of every floor.
3. Each upper floor: a front balcony over the stilt, living and dining of 14 x 22 feet, kitchen of 8 x 11 feet, three bedrooms, two or three toilets, and a rear shaft.
4. Terrace: usually with the top floor or shared, with the overhead tanks over the stair core.

The stair position is the whole trick. Pushing it to one side wall, instead of the centre, keeps the floor plate as one open rectangle so each flat gets a straight run from the front balcony to the rear bedroom. Our post on staircase placement in a house plan compares the side stair with the central stair floor by floor.

Builder floors trade a little privacy for a lot of value. The common stair means you meet your neighbour daily. In return, a 150 gaj owner who builds stilt plus 3 can keep one floor and sell or rent two, which often pays for the whole construction. See the layouts in our rental income house plans collection for how the floors are separated for metering and entry.

3 BHK per floor: the 150 gaj layout we draw most

On a 30x45 plot with 80 percent coverage, each floor has about 1,080 sq ft. Take out 130 sq ft for the stair and lift core and you have 950 sq ft of flat. This is the 150 gaj 3 bhk house plan that works.

Keeping both toilets on one wall saves a plumbing stack and about Rs 40,000 per floor. Keeping the passage under 120 sq ft is what lets the third bedroom reach 10 x 11 feet instead of shrinking to a store.

When the client wants 4 bedrooms

It is possible at 9 x 10 feet rooms with the living room cut to 12 x 16 feet. We draw it rarely. A 3 BHK with a proper 13 x 22 feet living space rents and sells better than a cramped 4 BHK in every NCR market we have worked in. If you need the fourth room for a parent, consider a servant room on the stilt or a room on the terrace instead.

For a comparison of how this room count sits on a slightly smaller plot, our 1200 sq ft house plan guide shows the 3 BHK at 900 to 1,000 sq ft per floor.

Light and ventilation on a 30 feet wide plot

Builder floors are notorious for dark middle bedrooms. With neighbours built to the boundary on both sides, light comes only from the front, the rear and the shafts. On a 45 feet deep plot, the middle 15 feet is the problem zone.

• Keep the rear setback as a real 1.5 to 2 m open strip, not a store. The master bedroom window there is your best light source.
• Make the shaft at least 4 x 6 feet. A 2 x 3 feet shaft is a drain, not a ventilation device.
• Put the kitchen and both toilets on the shaft so the middle bedroom can take a side window where the bylaw permits one.
• Use a ventilator strip above the living room door onto the stair core, which brings cross draught through the flat.

The shaft sizes and window placements that work on narrow and medium plots are covered in our guide to natural light and ventilation in house design. On the 150 gaj plots we have visited after handover, the single biggest difference between a happy owner and an unhappy one is the size of that rear shaft.

Floors allowed and the approval route

Delhi allows stilt plus 4 floors on 150 gaj plots where the road is 9 m or wider, under the 2021 unified bylaws, with a height limit of 17.5 m. Gurgaon under Haryana rules allows stilt plus 4 on licensed colony plots after the 2023 revision, though some sectors have fresh restrictions on it, so check the current status for your sector. Noida and Greater Noida allow G+2 or stilt plus 3 under a 15 m cap in most residential sectors. Ghaziabad and Faridabad follow a similar G+3 or stilt plus 3 pattern.

The sanction file for a builder floor is heavier than for a single family house. You need the structural drawing, a soil report, the fire NOC in Delhi for anything above 15 m, and a lift provision shown on the plan. The full sequence, fees and typical timelines are in our guide to the building plan approval process in India.

Decide early whether you want an independent house or a builder floor stack. Our comparison of duplex vs single storey houses covers the family house side, and the pillar on how to choose the right house plan in India covers the decision between living in all of it and renting part of it.

150 gaj house construction cost in 2026

At 2026 NCR rates of Rs 2,100 to 2,700 per sq ft for standard finishes, one floor of 1,080 sq ft costs Rs 22 to 29 lakh. The stilt, with its columns, slab and ramp, adds Rs 8 to 10 lakh. A lift for four stops adds Rs 10 to 14 lakh including the shaft and machine room. Premium finishes, which builder floor buyers in Gurgaon expect, push the per floor cost to Rs 32 to 38 lakh.

Our structural engineer asks for a soil test on every stilt plus 3 or higher in the Yamuna and Hindon belts. The silt there often needs footings 2.5 to 3 m deep instead of the usual 1.5 m, which changes the cost by Rs 2 to 4 lakh. Knowing it before the quote is far better than finding it after excavation.

Next step: a 150 gaj plan for your plot

Browse ready 3 BHK builder floor and family house layouts at our 150 gaj house plans hub, or see plot specific options at 30x45 house plans. Our architects draw custom 150 gaj plans for clients across Gurgaon, Delhi, Noida and Faridabad, matched to the current bylaws of the sector. The first consultation is free. Call +91 73165 33888 or email contact@housedesignindia.com with your plot size, facing, road width and the number of floors you want, and we will reply with first options within two working days.