Published: May 2026 | White Warp | whitewarp.in
If you've ever bought, sold, or evaluated a plot in Delhi NCR, you've heard the term FSI. Most people nod along without fully understanding it. That's expensive — because FSI, more than almost any other factor, determines whether a plot is a good investment or a trap.
This guide explains FSI clearly: what it is, how it works in Delhi, Gurugram, and Noida, and exactly how it affects your returns as a developer or plot buyer.
FSI: The Number That Decides What You Can Build
FSI — Floor Space Index — is the ratio of total built-up area to plot area.
If your plot is 200 sqm and the applicable FSI is 2.0, you can build a maximum of 400 sqm of floor space across all floors combined.
That's it. That's the whole concept.
But FSI is not a fixed number. It varies based on:
- Plot size — smaller plots often have lower FSI
- Road width — wider roads allow higher FSI (more development density)
- Zone classification — residential, commercial, mixed-use, transit-oriented
- State jurisdiction — Delhi (MCD), Gurugram (DTCP/HRERA), Noida (GNIDA/YEIDA)
Getting the FSI wrong by even 0.25 points can cost you ₹30–60 lakhs on a typical 200 sqm plot.
How FSI Works in Delhi (MCD Bylaws + Master Plan 2041)
Delhi's FSI is governed by the Delhi Master Plan 2041 and MCD building bylaws. The rules changed significantly with the 2021 revision.
FSI by road width (residential zones, Delhi):
| Road Width | FSI |
|---|---|
| Up to 6m | 1.2 |
| 6–9m | 1.5 |
| 9–12m | 2.0 |
| 12–18m | 2.5 |
| 18–24m | 3.0 |
| Above 24m | 3.5 |
This is for standard residential plots in MCD-governed areas. Transit-oriented zones (within 500m of Metro stations) can get up to 4.0 FSI.
Important: DDA-allotted plots follow different rules. For DDA residential plots (Dwarka, Rohini DDA phases, most planned residential sectors in Delhi), the DDA Handbook 2021 applies. Under DDA rules, FSI is plot-size-driven, not road-width-driven:
- ≤250 sqm: FSI 3.0 (75% coverage)
- 250–750 sqm: FSI 2.25 (75% coverage)
- 750–1,000 sqm: FSI 2.0 (50% coverage)
The road width determines permissible building height under DDA rules — not the FSI. For DDA plots, always verify whether your plot falls under DDA or MCD jurisdiction before using the road-width table above.
Additional FSI components:
Basement: Basement built for parking is typically exempt from FSI calculations. This is why most NCR apartments have basement parking — it's free square footage.
Staircase and lift shaft: Partially exempt, depending on configuration.
Balconies: Up to 1.5m depth is typically exempt (counts as open space, not floor area).
Ground floor setback area: The ground floor built area must comply with coverage limits (typically 33–50% of plot area), separate from FSI.
How FSI Works in Gurugram (DTCP Haryana)
Gurugram (formerly Gurgaon) falls under Haryana's DTCP (Department of Town and Country Planning). The FSI rules here are somewhat simpler but have different parameters.
FSI in Gurugram (residential colonies):
| Category | FSI |
|---|---|
| Licensed colony, 6m road | 1.75 |
| Licensed colony, 9m+ road | 2.0 |
| Licensed colony, 12m+ road | 2.5 |
| Special Economic Zones | 2.5–3.5 |
Key difference from Delhi: In Gurugram, RERA-registered buildings need additional compliance documentation. Developers building in Gurugram under the RERA framework must disclose FSI utilisation in their registration documents.
Setbacks in Gurugram:
- Front: 6 feet minimum on 6m roads, scaling up with road width
- Side: 3 feet per floor on each side
- Rear: 3–5 feet depending on plot size
How FSI Works in Noida and Greater Noida (GNIDA/YEIDA)
Noida's FSI is controlled by GNIDA (Gautam Buddha Nagar Industrial Development Authority), and Greater Noida by GNIDA and YEIDA for Yamuna Expressway zones.
FSI in Noida (residential individual plots):
Under NOIDA Building Regulations 2010 (the current applicable statute):
| Plot Size | FAR (same as FSI) | Ground Coverage |
|---|---|---|
| Up to 500 sqm | 1.80 | 75% (up to 400 sqm); 65% (400–500 sqm) |
| 500–750 sqm | 1.50 | 60% |
| Above 750 sqm | 1.50 | 50% |
Note: Noida uses the term FAR (Floor Area Ratio) instead of FSI — they mean the same thing.
Group housing is different. Developer-built residential complexes on large plots (≥2,000 sqm minimum) follow a separate FAR schedule — up to 3.0 under current regulations. This is what most apartment developments in Sectors 137, 150, and Greater Noida West use. For individual residential plots, FAR 1.80 is the applicable figure.
Noida Extension (Greater Noida West): FAR 3.0 for group housing plots (minimum 2,000 sqm), making it one of the more development-friendly zones for large-scale residential builders.
YEIDA (Yamuna Expressway): Plots in the airport corridor (near Jewar) are attracting significant developer interest. FSI/FAR here is typically 2.0–3.0 for residential, with higher allowances for mixed-use in airport zone.
The Road Width Trap
Here's the scenario that catches most buyers.
You find a 150 sqm plot in a residential colony priced at ₹80 lakh. The broker says "great FSI here — you can build 5 floors." You check the Master Plan and see the zone allows 2.0 FSI.
What you didn't check: the road width.
The road in front is 6 metres. At 6 metres in Delhi, FSI is 1.5, not 2.0. Your permissible built-up area just dropped from 300 sqm to 225 sqm. That's 75 sqm less — roughly ₹45–60 lakh in sellable area you won't have.
The plot is priced as if it has 2.0 FSI. It doesn't.
This happens constantly in older Delhi colonies, undivided plots in Ghaziabad, and sub-divided plots in Faridabad. Always measure the road width yourself or commission a survey.
FSI and Your Returns: A Worked Example
Plot: 250 sqm in Gurugram Sector 57 Road width: 12 metres Applicable FSI: 2.0
Permissible built-up area: 250 × 2.0 = 500 sqm
After applying coverage (40% max on ground floor) and standard setbacks, the usable sellable area across floors comes to approximately 420–440 sqm (4,500–4,700 sqft).
At current Gurugram Sector 57 rates (₹8,000–9,500/sqft for new residential):
- Conservative revenue: 4,500 sqft × ₹8,000 = ₹3.6 crore
- Optimistic revenue: 4,700 sqft × ₹9,500 = ₹4.47 crore
Construction + all costs at mid-spec: approximately ₹2.8–3.0 crore (land + stamp + construction + fees).
Net margin range: ₹60 lakh to ₹1.47 crore — depending on which selling rate you achieve.
This is why the selling rate assumption is the most sensitive variable in the model. A 10% move in selling rate moves the profit by 40–60%.
What FSI Doesn't Tell You (But Matters as Much)
FSI tells you how much you can build. It doesn't tell you whether you should.
Factors FSI doesn't account for:
- Current market absorption: If 12 new buildings opened in the last 6 months in your micro-market, selling rates may be under pressure
- Construction cost inflation: Steel, cement, and labour costs have risen 25–35% in NCR over the past 3 years
- Approval timeline risk: MCD sanctions in Delhi can take 6–18 months. Gurugram DTCP approvals: 3–9 months. Delays increase finance costs
- Title and encumbrance risk: FSI is irrelevant if the title has a court case on it
A proper feasibility analysis models all of these — not just the FSI calculation.
How White Warp Handles FSI
When you submit a plot to White Warp, the engine:
- Takes your plot location, size, and road width
- Cross-references Delhi NCR building bylaws to compute the exact FSI for your plot
- Calculates permissible floors, height, setbacks, ground coverage, and sellable area
- Runs the full financial model: revenue, all cost heads, margin, IRR, break-even rate
- Simulates 50,000 scenarios to show the full profit distribution — not just a point estimate
The result: you know exactly what you can build and whether it's worth building before committing any money.
Run your plot through White Warp →
Quick FSI Reference Card for Delhi NCR
| Zone | Key FSI Rule |
|---|---|
| Delhi residential (9m road) | 2.0 |
| Delhi residential (18m road) | 3.0 |
| Delhi TOD (near Metro) | Up to 4.0 |
| Gurugram licensed colony (12m road) | 2.5 |
| Noida residential (100–300 sqm) | 2.5 |
| Greater Noida West (group housing) | 2.5 |
| YEIDA airport zone | 2.0–3.0 |
Before you evaluate any plot, find out which jurisdiction it falls under, what road width fronts the plot, and what zone classification applies. These three inputs determine your FSI — and your FSI determines your returns.
White Warp computes exact FSI, sellable area, and full financial feasibility for Delhi NCR plots in 10 minutes. Start your analysis here.