20x30 House Plan: 1 BHK, 2 BHK and G+1 Layouts (2026)

What a 20x30 site actually gives you

A 20x30 house plan starts with 600 sq ft of land, but you never build on all of it. Most municipal bylaws take 3 feet at the front and 2 to 3 feet at the back on a site this small. What remains is a footprint of 420 to 500 sq ft, and that is your real ground floor.

On that footprint you can place a living room, a kitchen and one bedroom with attached toilet, but not a second bedroom without every room feeling like a cupboard. So a single floor 20x30 house design is a 1 BHK, and a G+1 is a 2 BHK. Accept that early and the rest of the planning gets easier.

Three ways to lay out a 20x30 house plan

Option 1: Ground floor only (1 BHK)

A single floor 20x30 house plan gives a 1 BHK of 420 to 500 sq ft. Living room at the front, kitchen behind it along one wall, bedroom at the back with an attached toilet. It suits a couple or a first stage build, and the footing should be designed for G+2 from day one.

Option 2: G+1 single family (2 BHK)

This is where most families on a 600 sq ft house plan end up. The ground floor keeps the living room, kitchen, a common toilet and a small car bay. The first floor adds two bedrooms and a balcony over the entrance. Total built-up lands at 850 to 1,000 sq ft, a comfortable 2 BHK for a family of four.

Option 3: 20x30 duplex house plan with a rental unit

On a G+2 sanction, a 20x30 duplex house plan keeps the owner's home across two floors and places a separate 1 BHK on top with its own staircase door. In Bangalore that top floor rents for Rs 8,000 to 14,000 a month in 2026. Check the FAR and height limit before you commit.

If your plot is 10 feet longer, you gain a second room per floor and a different set of options, which we cover in our guide to 20x40 house plan layouts and ideas.

Room sizes that work on a 20 feet width

Twenty feet of width, less the walls, leaves about 18 feet 6 inches inside. That is not enough for two rooms side by side with a passage, so every 20x30 house design stacks rooms front to back. These are the sizes we use in our Indore studio.

• Living room: 10 x 12 feet to 11 x 13 feet at the front, main door on one side.
• Kitchen: 7 x 9 feet to 8 x 10 feet, with a window on the rear or side wall.
• Bedrooms: 10 x 11 feet to 11 x 12 feet. Under 10 feet wide, a double bed and a wardrobe will not both fit.
• Toilets: 4 x 7 feet minimum, 4 x 6 feet with a corner basin.
• Staircase: 3 feet wide, dog leg, about 7 x 10 feet including the landing.

The staircase decides whether the plan works. Keep it against a side wall, never in the middle, or the ground floor loses its only through light. Our post on where to place the staircase in a house plan shows the options with sketches.

Bangalore 20x30 sites: what the bylaws allow

The 20 by 30 house plan is a Bangalore staple, sold as a 20x30 site in almost every layout from Yelahanka to Electronic City. Rules change by zone and by whether the layout is BDA approved, BBMP approved or a revenue site, so treat these as the common case and confirm with your sanctioned layout.

• Setbacks: 3 feet front and 2 to 3 feet rear. Side setbacks are often waived under 1,000 sq ft.
• Floors and FAR: G+2 is usually permitted with a height cap around 11.5 m, and a FAR of 1.75 to 2.0 allows 1,050 to 1,200 sq ft of built-up.
• Parking: one car space is required on most sanctions, and a rainwater sump is compulsory.

Our urban planner reviews the FAR on every Bangalore file before the floor plan is drawn, because a plan at 500 sq ft footprint is useless if the sanction allows 440. Finished examples for this city are on our house design in Bangalore page.

What a 20x30 house costs to build in 2026

Small plots cost more per sq ft than large ones, because the stair, toilets and kitchen cost the same whether the house is 500 or 1,500 sq ft. In 2026 standard finish civil work runs Rs 1,800 to 2,400 per sq ft in tier 2 cities and Rs 2,200 to 3,000 per sq ft in Bangalore, Pune and Hyderabad.

Run your own numbers in the construction cost calculator, then read how a 1,000 sq ft house cost breaks down in 2026, since a G+1 20x30 house lands at almost that area.

Vastu and orientation on a 20x30 site

Vastu guidance on a narrow site is mostly about which end gets which room. A 20x30 north facing house plan is the simplest case: entrance on the north wall, living room at the north end, kitchen in the south east, master bedroom at the south west rear. East facing sites follow the same logic. South and west facing sites keep the entrance in the right quarter of the front wall and the north east corner for a pooja shelf or window. Treat it as Vastu preference, not physics, and keep a window at the front and back of every floor as the first priority.

Mistakes we see on 20x30 house plans

1. A central staircase that cuts the ground floor into two dark halves.
2. A car bay drawn at 8 x 14 feet. Hatchbacks need 9 x 16 feet to open the doors.
3. No overhead tank position. It goes above the stair headroom, and if that is not drawn the plumber decides for you.

The 15x40 plot has the same area with an even narrower front, and our guide to the 15x40 small plot house plan explains how planning changes at 15 feet. Both sizes lean on the same compact tricks, gathered in our small plot house design tips.

Your next step

Confirm the sanctioned setbacks, the FAR and the permitted height, then pick the layout that fits your household and your rental plans. Our pillar guide on how to choose the right house plan in India walks through the rest.

Browse our ready 600 sq ft house plans to see dimensioned 20x30 layouts, or send your site details through our floor plan design service for a free first consultation.