The 30x40 site, about 1,200 sq ft, is the most common residential plot size in Bangalore. Thousands of families build their first independent house on one, in BDA layouts, private layouts and older neighbourhoods across the city.
A 30x40 site is small enough that every foot matters, and large enough to build a comfortable family home, a home with rental income or a duplex with a terrace garden. The plan you choose decides how the house lives for the next thirty years.
This guide covers what you can build on a 30x40 site, common layouts, Vastu options, parking, construction cost and the timeline in 2026.
Site size and setbacks
A 30x40 site measures 30 feet wide by 40 feet deep, or about 9 by 12 metres, a total of 1,200 sq ft.
Bangalore building rules require setbacks: open spaces left between the building and the site boundaries on the front, rear and sides. The exact setbacks depend on the plot size, road width and the approving authority. After setbacks, the built-up footprint on a 30x40 site is usually around 800 to 950 sq ft per floor.
The floor area ratio, or FAR, limits the total built-up area across all floors. It depends on the road width and zone. Check the rules for your site before planning floors.
What you can build
A ground-floor house of about 800 to 950 sq ft holds a 2 BHK comfortably.
A G+1 house of about 1,600 to 1,900 sq ft holds a 3 BHK duplex for one family, or a 2 BHK on each floor.
A G+2 house of about 2,400 to 2,850 sq ft, often with stilt parking, holds a family home plus a rental unit, or a large 4 BHK.
Common layouts
A G+1 3 BHK duplex: living, dining, kitchen, a guest bedroom and a bathroom on the ground floor; two bedrooms, a family lounge and two bathrooms on the first floor.
A 2 BHK on each floor: the owner lives on one floor and rents out the other, or two generations of the family live independently.
A G+2 with stilt parking: parking and a utility room on the ground, the family home across the first and second floors, and a terrace garden on top.
A G+2 with rental: a 1 BHK or 2 BHK on the ground floor for rent, the family home above.
Vastu-friendly planning
On an east or north facing 30x40 site, the open front naturally suits Vastu: the entrance and living room on the east or north, the kitchen in the south-east, the master bedroom in the south-west, the pooja room in the north-east and the staircase along the south or west.
On south and west facing sites, the main door is placed carefully within the front wall, and the living spaces and garden sit towards the north and east at the back.
Parking
Most 30x40 houses need space for one car and two-wheelers. Parking can be in the front setback, under a porch or in a stilt floor.
A stilt floor gives covered parking and an extra floor of living space above, but adds to the height and the cost.
Staircase and lift
A staircase takes about 80 to 100 sq ft per floor. Place it along a side wall to keep the rooms regular.
If the family includes older members, plan space for a home lift beside the staircase, even if it is installed later.
Talk through layout, budget and timeline.
Light and ventilation
On a narrow site with neighbours close on both sides, light and air come mainly from the front, the back and the top. Use a central courtyard, a skylight over the staircase or a light well to bring daylight into the middle of the house.
Plan windows on the side setbacks where they do not face a neighbour's windows directly.
Water and services
Plan a sump, an overhead tank, a borewell if permitted, and rainwater harvesting, which is required for new houses in Bangalore.
Plan the drainage and sewer connections, electrical meter positions and a solar water heater on the terrace.
Rental units and future plans
Many families on 30x40 sites build one floor for rent to help with the loan. A separate entrance, an independent staircase and separate electrical and water meters make a rental floor easier to manage and to let.
If you may add a floor later, design the structure for it now: columns, footings and the staircase sized for the final height. Adding strength later is expensive and sometimes not possible.
Common mistakes
Fixing the elevation before the floor plan is the first. The plan should drive the windows and balconies, and the elevation should be designed around them.
Making every room the same size is the second. On a small site, a slightly larger living area and slightly smaller bedrooms often work better for daily life.
Ignoring the terrace is the third. A covered part of the terrace with a utility area, a solar water heater and a small garden makes the top floor far more usable.
Construction cost in 2026
House construction in Bangalore costs about Rs 2,000 to Rs 2,400 per sq ft for a basic package, Rs 2,400 to Rs 2,900 for a standard package and Rs 3,000 to Rs 4,000 or more for a premium package, depending on the materials and finishes.
At standard package rates, a G+1 house of about 1,800 sq ft on a 30x40 site costs roughly Rs 43 lakh to Rs 52 lakh to build. A G+2 house of about 2,700 sq ft costs roughly Rs 65 lakh to Rs 78 lakh. Interiors, the compound wall, the gate and approvals are extra.
Timeline
Design and approvals usually take two to four months. Construction of a G+1 house takes about 10 to 14 months, and a G+2 house 14 to 18 months, depending on the contractor, the weather and how quickly decisions are made.
Planning interiors with the house
Plan the interiors with the architecture: wardrobe walls without windows, kitchen layouts that suit the plumbing, electrical points for furniture and lights, and ceiling heights for false ceilings. It saves breaking walls later.
Book a free consultation with YellowDot Design Studio. Our architecture and civil team, working with partner architects, plans the layout, structure and interiors as one drawing set.
Plan the house and the interiors together