The cost of a Room Addition at Terrace is a very easy process. Building extra space at home is now easier and more affordable than before. Many homeowners want to know the real cost of a room addition on the terrace, and this article explains everything in a simple way.
You will find cost ranges, material calculations, labor costs, and a full estimated example.
⭐ What Is a Terrace Room Addition?
A terrace room addition means constructing a new room on your rooftop. It can be used as:
- Bedroom
- Study/office
- Guest room
- Living room
- Rental room
Before starting, you must understand the real cost of a room addition on a terrace so you can plan correctly.
⭐ Average Cost of Room Addition at Terrace
The cost of a room addition on the terrace usually ranges from:
Rs 4,50,000 to Rs 6,80,000
But this depends on:
- Room size
- Construction materials
- Roofing type
- Labor charges
- Waterproofing quality
- Finishing level
Cost Calculation for a Standard 12 ft × 12 ft Room (144 sq ft)
Below is a full real-world calculation to understand the terrace room construction cost.
✔ 1. Material Cost Calculation
A. RCC / Brick Wall Construction
Room size: 12 ft × 12 ft = 144 sq.ft
Wall area (for 10 ft height):
Perimeter = (12+12+12+12) = 48 ft
Wall height = 10 ft
Wall area = 48 × 10 = 480 sq.ft
Average brick wall cost = 380 – 450 per sq ft
480 sq ft × 300 = Rs 1,44,000/-
So, wall construction cost =1,44,000/-
B. Roof Slab or Metal Roof
Two options:
1. RCC Roof Slab
Cost = 1250 to 1780 per sq ft
144 sq ft × 1250 = 1,80,000/-
2. Metal Roofing Sheet (Cheaper Option)
Cost = 550 to 850 per sq ft
144 sq ft × 550 = Rs 79,200/-
C. Flooring Cost
Tiles cost = 480-600 per sq ft
144 sq ft × 480 = 69,120/-
D. UPVC Door & Window
- Main door: 18,000/-
- Window (2 pcs): 45,000/-
Total = 63,000/-
E. Electrical Wiring
Includes wiring, switches, and lights:
Average =15,000 to 25,000
F. Waterproofing
Terrace waterproofing is essential.
Cost = 70,000 to 95,000
G. Painting & Finishing
Interior + exterior = 45,000 to 70,000
⭐ ✔ 2. Labor Cost Calculation
Labor typically accounts for 30–40% of the total cost.
For this room: 4,85,320/-
Material cost approx. =
Labor cost = 35% of 4,85,320 = Rs 1,69,862/-
⭐ ✔ 3. Total Estimated Cost Calculation (Final)
| Work Type | Estimated Cost |
|---|---|
| Wall Construction | 1,44,000 |
| Metal Roof | 79,200 |
| Flooring | 69,120 |
| Door & Windows | 63,000 |
| Electrical Work | 15,000 |
| Waterproofing | 70,000 |
| Painting | 45,000 |
| Labor Cost (35%) | 1,69,862 |
Total Estimated Cost:
👉 Minimum: 6,00,000/-
👉 Maximum: 7,50,000/-
(If you choose premium materials and an RCC slab, the cost of a room addition on the terrace can go up to 6,00,000-7,50,000.)
⭐ Detailed Summary: Cost of Room Addition at Terrace
The cost of the room addition on the terrace includes:
- Structural check
- Civil construction
- Roofing
- Electrical & plumbing
- Finishing
- Waterproofing
- Labor charges
Using high-quality materials increases durability but also increases the cost of the room addition on the terrace.
⭐ How to Reduce Terrace Room Construction Cost
- Use metal roofing instead of an RCC slab
- Choose lightweight blocks instead of full brick
- Keep the design simple
- Buy materials in bulk
- Avoid unnecessary partitions
Making informed decisions can reduce the overall terrace room construction cost in Nepal by 10–25%.
⭐ Conclusion
The cost of a room addition on the terrace depends on your chosen materials, room size, and finishing level. On average, a standard 12×12 ft room requires 6,00,000-7,50,000, but the cost can increase with premium designs.
With proper planning and a clear cost calculation, you can build a strong, beautiful terrace room within your budget.