Room Addition Cost in Nepal: 13x13 Metal Structure Room Estimate (2026)

Looking to expand your home? Whether you call it room addition, kotha thapne, talla thapne, rooftop room, or terrace room addition, the first thing you need is a clear cost idea.

In Nepal, many homeowners want extra space for a bedroom, study room, rental room, office space, puja room, or rooftop room without going through heavy RCC construction. A modern metal structure system can be a fast, lightweight and practical solution.

Quick Answer: Room Addition Cost in Nepal

For a 13 ft x 13 ft room (169 sq. ft.), the approximate cost using a modern metal structure system is around Rs. 3,00,000.

This can include metal framing, uPVC roofing, brick base wall, plaster, cement board wall, false ceiling, uPVC door and windows, exterior painting, basic light points, electrician work, basic plumbing, gutter work and site expenses.

Best Uses for a 13x13 Room Addition

• Extra bedroom or guest room
• Study room or home office
• Rental room for extra income
• Puja room or store room
• Rooftop room / terrace extension

Cost Breakdown

1. Metal Framing with uPVC Roofing - Rs. 520/sq. ft.

Approx. cost: Rs. 87,880. Includes 3"x3" post, 1.75"x3" lower/top purlin, 1.5"x1.5" top purlin, uPVC roofing sheet, fasteners and installation. Lighter than RCC and ideal for rooftop rooms.

2. Brick Wall / Brick Base - Rs. 280/sq. ft.

Used in the lower section for stability. A combination of brick base and cement board keeps cost low while giving a clean finish.

3. Plaster Work - Rs. 120/sq. ft.

Smooths the brick surface and prepares it for painting.

4. Cement Board Wall - Rs. 250/sq. ft.

Lightweight and easy to install. It reduces load on the existing structure while giving a modern finish.

5. False Ceiling - Rs. 90/sq. ft.

Approx. cost: Rs. 15,210. Conceals wiring and improves lighting placement.

6. uPVC Windows & Doors

uPVC window rate: Rs. 650/sq. ft. uPVC door rate: Rs. 800/sq. ft. Durable, low-maintenance and modern.

7. Coloring & Painting - Rs. 35/sq. ft.

Tractor Emulsion Exterior protects the surface from weather and moisture.

What May Cost Extra?

• Extra windows or premium doors
• Flooring or tiles
• Bathroom or heavy plumbing work
• Waterproofing, staircase or railing
• Structural strengthening or difficult material lifting

Metal Structure vs RCC Room Addition

Metal structure is generally faster and lighter than RCC, making it practical for rooftop rooms and terrace extensions. RCC is strong but heavier and requires more wet work and time.