Extensive Green Roof (Lightweight, Low-Maintenance)

These are the most affordable systems.
Good for homes, garages, small buildings, and roofs with low load capacity.
Price Range:

$10 – $30 per sq ft
$100 – $300 per sq meter
Includes:

  • Waterproofing
  • Root barrier
  • Drainage layer
  • 5–15 cm soil
  • Sedum or low plants

Ideal For:

  • Simple green roofs
  • Minimal maintenance
  • Budget-friendly projects

2. Semi-Intensive Green Roof

Moderate depth, more plant options, and a balance between cost and aesthetics.
Price Range:

$30 – $60 per sq ft
$300 – $600 per sq meter
Includes:

  • 12–20 cm soil
  • Grasses + herbs
  • Medium drainage system

Ideal For:

  • Buildings wanting more greenery
  • Medium maintenance
  • Decorative rooftops

3. Intensive Green Roof (Full Garden Rooftop)

These are premium, garden-like rooftops that can include paths, shrubs, and even small trees.
Price Range:

$60 – $150+ per sq ft
$600 – $1,500+ per sq meter
Includes:

  • Deep soil (20 cm – 1 meter)
  • Trees, bushes, flowers
  • Irrigation systems
  • High-load roof structure

Ideal For:

  • Luxury buildings
  • Hotels, malls, high-end homes
  • Recreational spaces

Additional Costs to Consider

1. Roof Reinforcement

If your roof cannot handle heavy loads:
$5 – $40 per sq ft
$50 – $400 per sq meter
2. Access Difficulty

More cost if:

  • Roof is high
  • Limited crane access
  • Complex building layout

Adds 10% – 25% to cost.
3. Irrigation System

Optional but often used in semi-intensive + intensive:
$2 – $10 per sq ft
$20 – $100 per sq meter
4. Maintenance Costs

  • Extensive: $0.50 – $2 per sq ft per year
  • Intensive: $1 – $5 per sq ft per year

Quick Summary Table

Green Roof Type Price per sq ft Price per sq meter Maintenance
Extensive $10–$30 $100–$300 Low
Semi-Intensive $30–$60 $300–$600 Medium
Intensive $60–$150+ $600–$1500+ High


References :

Green Roof

Testing Waterproofing for a Green Roof

Understanding Green Roof System Layers

Choosing the Right Waterproofing for a Green Roof