The cost of building a 3-bedroom flat roof house can vary widely based on numerous factors including location, size, materials used, labor costs, and any additional features or customizations. However, I can provide a rough estimate based on average costs in the United States.

Here’s a breakdown of potential costs of building

Land:

Land: The price of land varies greatly depending on location, size, and local real estate market conditions. It’s essential to consider this cost when planning to build a house. i.e the cost of land in Karen not the same in Garden Estate

Construction Materials:

Construction Materials: The cost of construction materials, including framing, roofing, siding, windows, doors, flooring, plumbing, electrical, and finishing materials, can range from 150sh to 26,000sh per square foot of living space. For a typical 3-bedroom house with around 1,500 to 2,000 square feet, this could total anywhere from 19,000,000sh to 52,000,000sh or more.

Labor Costs determinant factor for cost of building

Labor Costs: Labor costs for construction can vary significantly depending on the region, labor rates, and the complexity of the project. Labor costs typically make up a significant portion of the total cost of building a house. For a 3-bedroom house, labor costs could range from 6,500,000sh to 19,500,000sh or more.

Permits and Fees:

Permits and Fees: You’ll need to obtain various permits and pay fees for zoning, building permits, inspections, and other regulatory requirements. These costs can vary depending on the location and the specific regulations in your area.

Architectural and Design Fees:

Architectural and Design Fees: If you’re working with an architect or designer to create custom plans for your house, you’ll need to budget for their fees, which can range from 5% to 15% of the total construction cost, depending on the scope of the project and the level of customization.

Contingency Fund:

Contingency Fund: It’s essential to set aside a contingency fund of around 10% to 20% of the total construction cost to cover unexpected expenses and changes during the construction process.

Taking all these factors into account, the total cost of building a 3-bedroom flat roof house in Nairobi could range from 17,000,000sh to 40,000,000sh or more. It’s important to obtain quotes from local contractors and suppliers to get a more accurate estimate based on your specific requirements and location. Additionally, consulting with architects or construction professionals can help you better understand the factors that will influence the final cost.