Site Survey
How to Choose the Best House Design for Your Plot Size
One of the biggest challenges homeowners face when planning their house is this — "My plot is this size. What is the best design for it?"
The answer is not as simple as picking a design from a catalogue. Every plot is unique — its dimensions, shape, orientation, road access, and surroundings all determine what kind of house design will work best on it.
In this guide we will walk you through exactly how to choose the best house design for your plot size — covering the most common plot sizes in India, layout principles, and the key factors that affect which design works for you.
Why Plot Size Alone Does Not Determine House Design
Before we get into specific plot sizes, it is important to understand that plot size is only one of several factors that determine the best house design.
The factors that together determine your ideal house design are:
| Factor | Why It Matters |
|---|---|
| Plot dimensions (length x width) | Determines room sizes, setbacks, and layout direction |
| Plot shape (regular or irregular) | Irregular shapes limit usable floor area |
| Plot orientation (North, South, East, West facing) | Affects sunlight, ventilation, and Vastu planning |
| Road access (front, side, or corner) | Determines where main entrance and parking go |
| Number of floors planned | Affects FAR utilisation and room distribution |
| Family size and requirements | Determines how many rooms and what type |
| Local building bylaws | Setback rules limit how close to boundary you can build |
| Budget | Determines built-up area and finish quality |
Important: Always get a site survey done before finalising your house design. Even a 1 to 2 foot difference in actual plot dimensions from what you assumed can significantly change your floor plan.
Understanding Plot Measurements in India
In India, plot sizes are measured in different units depending on the region. Here is a quick reference:
| Unit | Equal To | Common In |
|---|---|---|
| 1 Gaj / Sq Yard | 9 sq ft | Delhi, UP, Haryana |
| 1 Marla | 272 sq ft (approx) | Punjab, Haryana, Chandigarh |
| 1 Biswa | Varies by state | UP, Uttarakhand |
| 1 Cent | 435.6 sq ft | South India |
| Sq Ft | Standard | Pan India |
What Are Setbacks and Why Do They Matter?
Before designing your house, you must know your setback rules — the minimum distance you must leave between your house and the plot boundary on each side.
Setbacks are set by local municipal authorities and vary by city and plot size. Here are approximate setback requirements for Delhi NCR:
| Plot Size | Front Setback | Rear Setback | Side Setback |
|---|---|---|---|
| Up to 50 sq m | 1.5 m | 1.5 m | 0 – 1 m |
| 50 – 100 sq m | 2 m | 1.5 m | 1 m |
| 100 – 250 sq m | 3 m | 2 m | 1.5 m |
| Above 250 sq m | 4 m | 3 m | 2 m |
Note: Always verify setback rules with your local municipal authority or architect before finalising your design. Rules differ between MCD, GDA, NPCL, and other local bodies.
After setbacks, the remaining area is your buildable footprint — the area on which your house can actually be constructed.
House Design Guide by Plot Size
Here is a detailed guide for the most common residential plot sizes in India.
???? 20x40 Feet Plot (800 sq ft | ~89 Gaj)
Buildable footprint after setbacks: Approximately 500 – 550 sq ft per floor
Ideal for: 1 BHK or compact 2 BHK
Best layout approach:
- Keep the design simple and rectangular — no projections or complex shapes
- Place living room and one bedroom on ground floor
- Second bedroom and bathroom on first floor if building G+1
- Combine living and dining to save space
- Use compact bathroom layouts — 4x5 or 5x6 feet
- Avoid wide staircases — use a straight staircase along one wall
Recommended configuration:
- Ground floor: Living room, 1 bedroom, 1 bathroom, kitchen
- First floor: 2 bedrooms, 1 bathroom, small balcony
- Total built-up area (G+1): Approximately 1,000 – 1,100 sq ft
Key design tips for 20x40:
- Use light colours on walls to make rooms feel larger
- Keep corridor width to minimum — 3 feet is sufficient
- Use wall-mounted storage to save floor space
- Sliding doors instead of swing doors in bathrooms save space
???? 30x40 Feet Plot (1200 sq ft | ~133 Gaj)
Buildable footprint after setbacks: Approximately 700 – 800 sq ft per floor
Ideal for: 2 BHK or 3 BHK
Best layout approach:
- Enough width to have a proper living-dining separation
- Can accommodate a dedicated kitchen with utility space
- Room for a car parking space within the plot
- G+1 gives a comfortable 3 BHK with good room sizes
Recommended configuration:
- Ground floor: Living room, dining, kitchen, 1 bedroom with attached bathroom, parking
- First floor: Master bedroom with attached bathroom, 2 bedrooms, common bathroom, balcony
- Total built-up area (G+1): Approximately 1,400 – 1,600 sq ft
Key design tips for 30x40:
- This is the most common plot size in Ghaziabad, Noida, and Delhi — many tried and tested layouts exist
- Vastu compliance is easier to achieve on this size
- Leave a small courtyard or light well if the plot is surrounded on three sides
- Consider a stilt parking on ground floor if the family has two vehicles
???? 30x50 Feet Plot (1500 sq ft | ~167 Gaj)
Buildable footprint after setbacks: Approximately 900 – 1000 sq ft per floor
Ideal for: 3 BHK or 4 BHK
Best layout approach:
- Comfortable room sizes across all bedrooms
- Space for a proper puja room, study, or home office
- Can accommodate a separate servant quarter on ground floor
- Good natural light and ventilation possible on all sides
Recommended configuration:
- Ground floor: Living, dining, kitchen, 1 bedroom with attached bathroom, puja room, parking
- First floor: Master bedroom with attached bathroom, 2 bedrooms, common bathroom, study, balcony
- Total built-up area (G+1): Approximately 1,800 – 2,000 sq ft
Key design tips for 30x50:
- East-facing plot of this size can achieve excellent Vastu compliance
- Wide enough for a proper dining table with 6 chairs — dining does not need to merge with living
- Consider a double-height entrance lobby for a premium feel
???? 40x60 Feet Plot (2400 sq ft | ~267 Gaj)
Buildable footprint after setbacks: Approximately 1,400 – 1,600 sq ft per floor
Ideal for: 4 BHK or 5 BHK — premium residential
Best layout approach:
- Full luxury residential design possible
- Space for double car parking, garden, and service entrance
- Can include a home office, gym room, or home theatre
- G+2 gives a large family home with clear floor-wise separation
Recommended configuration:
- Ground floor: Grand living, formal dining, kitchen with pantry, 1 guest bedroom, puja room, double parking
- First floor: Master bedroom with walk-in wardrobe and attached bathroom, 2 bedrooms with attached bathrooms, family lounge
- Second floor: 1 bedroom, home office or gym, terrace garden
- Total built-up area (G+2): Approximately 4,000 – 4,500 sq ft
Key design tips for 40x60:
- Wide enough for a grand entrance with a double door and foyer
- Consider a central courtyard or skylight for natural light in deep plan areas
- Premium exterior elevation with stone cladding, large windows, and canopy can be achieved comfortably
???? Narrow Plots (Width Less Than 18 Feet)
Narrow plots — common in older Delhi neighbourhoods and densely built areas — present unique design challenges.
Common problems with narrow plots:
- Very limited room widths — less than 10 feet after wall thickness
- Natural light difficult to achieve in middle rooms
- Staircase takes disproportionate floor area
Design solutions for narrow plots:
- Use a split-level design to separate living zones without losing floor area
- Place staircase along the rear wall to maximise usable width
- Use skylights or light wells to bring natural light to middle floors
- Consider open-plan living and kitchen to avoid the corridor feeling
- Use glass partitions instead of solid walls between living and dining
???? Corner Plots — A Special Advantage
Corner plots — those with road access on two sides — are considered premium because they offer:
- Better natural light and ventilation from two sides
- More design flexibility for entrance and parking
- Better Vastu options — more directions available for main entrance
- Higher visual impact for facade design — both road-facing sides can be designed
Design tips for corner plots:
- Place the main entrance on the corner or on the less busy road for privacy
- Both road-facing facades should be designed — not just the primary front
- Corner plots allow L-shaped or angled designs that are not possible on regular plots
- Can accommodate a wraparound balcony for premium visual appeal
North, South, East, West — Which Plot Facing Is Best?
Plot facing — the direction your main entrance faces — significantly affects sunlight, ventilation, and Vastu compliance.
| Facing | Sunlight | Vastu | Design Notes |
|---|---|---|---|
| North Facing | Good morning light in front | Highly auspicious | Main entrance on North — very popular |
| East Facing | Morning sun in living areas | Auspicious | Best for sunlight — living room gets morning sun |
| South Facing | Afternoon sun from front | Requires Vastu adjustments | Good if properly designed — avoid low windows on South |
| West Facing | Evening sun in front | Acceptable | Hot afternoons — use deep balconies for shade |
Note: Every plot facing can be designed well with a skilled architect. No facing direction makes a house impossible to design comfortably — it just requires different approaches to window placement, room orientation, and shading.
How Many Floors Should You Build?
The number of floors depends on your FAR (Floor Area Ratio) — the total built-up area allowed on your plot as a multiple of the plot area. FAR varies by city and zone.
| City / Authority | Typical Residential FAR |
|---|---|
| Delhi (MCD) | 1.2 to 3.5 depending on zone |
| Noida (NPCL) | 1.75 to 2.0 |
| Ghaziabad (GDA) | 1.5 to 2.0 |
| Gurgaon (DTCP) | 1.5 to 2.0 |
| Faridabad (MCF) | 1.5 to 2.0 |
Always ask your architect to check the applicable FAR for your specific plot before designing. Exceeding FAR is illegal and can result in demolition notices.
Step-by-Step Process to Choose the Right House Design
Follow these steps in order to choose the best design for your plot:
Step 1 — Get a Site Survey Done Confirm exact plot dimensions, orientation, and boundary conditions before any design work.
Step 2 — Check Local Bylaws Find out setback requirements, FAR limits, and height restrictions for your plot from your local authority or architect.
Step 3 — List Your Requirements Write down how many rooms you need, number of floors, parking requirements, special rooms (puja, study, gym), and your budget.
Step 4 — Discuss With Your Architect Share your site survey data, requirements, and budget. A good architect will propose 2 to 3 layout options for you to choose from.
Step 5 — Review in 2D and 3D Review the shortlisted layout in 2D for room sizes and flow, then in 3D for exterior appearance and interior feel.
Step 6 — Finalise With Full Family Walk every family member through the 3D design. Get their feedback on room positions, kitchen layout, and bathroom access before giving final approval.
Step 7 — Proceed to Structural and Service Drawings Only after the floor plan and 3D are finalised — proceed to structural design, electrical layout, and plumbing plan.
How Planzaa Helps You Get the Right Design for Your Plot
At Planzaa our process is built around your specific plot — not a generic template.
- ? Site surveyor visits your plot and collects accurate measurements
- ? Registered architect designs your floor plan based on your exact plot dimensions, orientation, and requirements
- ? 3D elevation created so you see your house before construction
- ? Vastu consultation included
- ? Multiple layout options provided — you choose what works best for your family
- ? All drawings delivered digitally through the Planzaa customer app
Get the right house design for your plot. Visit www.planzaa.in or call +91-9818176157 for a free consultation.
Frequently Asked Questions
Q1: Can I build a 3BHK on a 20x40 plot? It is possible but very tight. A 20x40 plot is better suited for a compact 2BHK across G+1. If a 3BHK is absolutely needed, rooms will be small and one bedroom may need to be without a window — which affects ventilation. It is better to plan realistically based on your plot size rather than forcing in more rooms than the plot can comfortably accommodate.
Q2: What is the maximum coverage I can build on my plot? Maximum ground coverage — the percentage of your plot that can be covered by construction — is set by local authorities. In Delhi NCR it is typically 50 to 75 percent of plot area depending on plot size and zone. Your architect will calculate this based on your specific plot location.
Q3: Is it better to build on the full plot or leave open space? Leaving open space — especially at the front and rear — improves natural light, ventilation, and visual appeal. It also gives you space for a garden, parking, and future extensions. Building to the maximum coverage allowed often results in dark, poorly ventilated rooms. A balance of built and open space produces the most comfortable homes.
Q4: Can I change my house design after construction has started? Design changes after construction begins are very expensive and disruptive. Changes to walls, columns, or room positions after the structure is cast can cost 5 to 10 times more than the same change in the design stage. Always finalise your complete design before breaking ground.
Q5: How do I know if my plot is North-facing or South-facing? The facing of a plot is determined by the direction of the road in front of the main entrance. If the road in front of your plot is to the North of your plot — your plot is North-facing. A site surveyor or your architect can confirm the exact orientation using a compass during the site survey.