Built-Up Area & Floor Space Calculator

Estimate how much you can legally build on your plot. Calculate FSI and total square footage across multiple floors.

Executive Summary

The 'Built-Up Area' is the total area of each floor including walls and balconies. In India, local municipal laws (FSI/FAR) dictate exactly how many square feet you can build on your land. Our tool helps you estimate your total buildable area after considering standard setbacks and the number of floors you intend to construct.

Standard setbacks usually take 25% - 35% of plot area.

Total Estimated Construction
1,680 Sq Ft
Built-Up Per Floor
840 Sq Ft

Key Specifications

Best ForBuilders planning G+1, G+2 complexes
Ideal Plot SizeAny
Suitable FloorsG to G+4
Vastu FriendlyIncludes Balcony logic
CustomizableAdjustable Setback Logic

Section 01

Factors Affecting Built-Up Area

Your actual built-up area depends on four critical factors beyond just plot size:

  • FSI (Floor Space Index): The ratio of total built-up area to plot area. If FSI is 1.5, you can build 1500 Sq Ft on a 1000 Sq Ft plot.
  • Setback Rules: Mandatory gaps on sides for fire safety and ventilation.
  • Wall Thickness: Built-up area includes the area of 9-inch or 6-inch walls.
  • Deductions: Shafts (OTS), parking voids, and stairs might be treated differently by local builders versus municipal bodies.

Design Tips from
Professional Architects

In most Indian cities, 'Stilt Parking' is excluded from FSI, allowing you to build an extra floor of living space.

A higher wall-to-floor ratio (complex shapes) increases your cost but maintains the same built-up area.

Check the 'Coverage' rule—it defines the maximum ground area you can build on (usually 60-75% of the plot).

Include the area of balconies in your built-up calculation as they cost ~80% of the internal room cost to build.

For accurate structural budgeting, always use the built-up area, not the carpet area.

Commonly Asked Questions

Technical insights and project advice for this category.

Knowing your built-up area is the key to accurate budgeting. Let's make every square foot count with a smart layout.