UDCPR Rule 4.0: Understanding Marginal Open Spaces (Setbacks) for Buildings

One of the most critical factors for building plan approval in Maharashtra under the Unified Development Control and Promotion Regulations (UDCPR) is maintaining proper marginal open spaces, commonly known as setbacks.

While Rule 3.5 defines basic open spaces, Rule 4.0 of UDCPR goes into more depth—detailing how these distances vary with plot size, height, and use of the building.

Let’s dive into UDCPR Rule 4.0 to understand how to calculate and apply setbacks during the planning of any building project.

🧱 What Are Marginal Open Spaces?

Marginal open spaces (MOS) refer to the unbuilt portions around a building that must be left open to ensure:

• Light and ventilation

• Fire safety and vehicle movement

• Structural separation from adjacent properties

• Aesthetic and hygienic living conditions

These are mandatory open spaces around all structures, and are essential for getting your plan sanctioned.

📐 What Does UDCPR Rule 4.0 Say?

Rule 4.0 lays down specific minimum open spaces required around buildings. These depend on:

• Plot size

• Height of the building

• Type of occupancy (residential, commercial, etc.)

• Abutting road width

• Location in congested or non-congested area

📏 General Guidelines from Rule 4.0

1. Buildings up to 10 meters in height

• Front setback: Minimum 1.5–3 meters (depending on road width)

• Side and rear setbacks: 1.0–1.5 meters

2. Buildings between 10 to 16 meters

• Front: 3 meters

• Side: 1.5–2 meters

• Rear: 1.5–2 meters

3. Buildings above 16 meters

• Front: 4–6 meters

• Side: 3–4.5 meters

• Rear: 3–6 meters

• Fire fighting access must also be provided

🔔 These figures are indicative and vary slightly by zone and local municipal rules. Always verify with your local authority.

🔥 Special Provisions for Fire Safety (High-Rise Buildings)

For buildings above 24 meters in height:

• Minimum 6 meters wide open space must be provided around the building

• Space must be motorable for fire-fighting vehicles

• Turning radius and entry/exit points are mandated

🏘️ What if My Plot is Small?

UDCPR provides relaxations for smaller plots:

• For plots below 100 sq.m, marginal spaces can be reduced

• Adjoining neighbor’s No Objection Certificate (NOC) may be required

• Additional compensatory measures like setbacks on one side only may be allowed

However, height limitations are imposed in return for such relaxations.

⚙️ Exceptions and Relaxations

Rule 4.0 also allows exceptions in:

• MHADA layouts

• Slum rehabilitation projects

• Cluster developments

• Eco-housing projects

These projects may follow special layouts, but open space norms are always examined in context of public safety and ventilation.

🚫 Common Mistakes to Avoid

❌ Misinterpreting road width while deciding front setback
❌ Assuming side margins are not needed on both sides
❌ Violating height-based setbacks and applying residential rules to commercial buildings
❌ Ignoring fire tender movement for high-rises

✅ Tips for Compliance

• Always consult UDCPR’s latest published version

• Use online setback calculators offered by local authorities

• Hire a licensed architect or planner familiar with UDCPR

• Ensure clear site layout with setback markings in plan submission

📣 Final Thoughts

Marginal open spaces under UDCPR Rule 4.0 are not optional—they’re fundamental safety and planning requirements. They ensure your building gets approved, remains safe for occupants, and avoids future legal complications.

A well-designed building respects its boundaries—not just legally, but for better urban living.